State of the Great Lakes 2007
Highlights
Canada
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State of the Great Lakes 2007
This Highlights report is based on
environmental indicator reports that
were prepared for the State of the
Lakes Ecosystem Conference
(SOLEC) in Milwaukee, Wisconsin,
1-3 November 2006. Many experts
on various components of the Great
Lakes basin ecosystem contributed
to the process. Data sources and
contact information for each
indicator are included in the
technical report, State of the Great
Lakes 2007.
Blue Heron, Don Brene
Sleeping Bear Dunes, Ro
Port Huron Mackinac Ra
Assessing Status and Trends of the
Great Lakes Ecosystem
s Ecosystem
Indicator Category Assessments and
Management Challenges:
Contaminatio"
Human Health
Biotic C
Invasiv
Habita
Resoui
Land Use-Land Cover
Climate Change
What is Beinc" Dn
Condition;
State of the Lakes ^
Conference
to Improve
Assessing Status and Trends of the Great Lakes
Ecosystem
Overall Status
In 2006, the overall status of the Great Lakes
ecosystem was assessed as mixed because some
conditions or areas were good while others were
poor. The trends of Great Lakes ecosystem conditions
varied: some conditions were improving and some
were worsening.
Since 1998, the U.S. Environmental Protection
Agency and Environment Canada have coordinated
a biennial assessment of the ecological health of
the Great Lakes ecosystem using a consistent set of
environmental and human health indicators. This assessment is in accordance with the
Great Lakes Water Quality Agreement (GLWQA). Each indicator report is supported by
scientific information collected and assessed by Great Lakes experts from Canada and the
United States, along with a review of scientific papers and use of best professional
judgment.
Indicators are organized into nine categories: Contamination, Human Health, Biotic
Communities, Invasive Species, Coastal Zones, Aquatic Habitats, Resource Utilization,
Land Use-Land Cover, and Climate Change. Overall assessments and management
challenges were prepared for each category to the extent that indicator information was
available. This State of the Great Lakes 2007 Highlights report is derived from a more
detailed State of the Great Lakes 2007 report. The 2007 Highlights report also includes
information on "What is Being Done to Improve Conditions," which outlines some
examples of actions taken by the Great Lakes community in response to environmental
conditions.
Photo credit: Paul Best
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Highlights
Authors of the indicator reports assessed the status of ecosystem
components in relation to desired conditions or ecosystem
objectives, if available. Five status categories were used (coded by
color in this Highlights report):
| | GOOD. The state of the ecosystem component is
presently meeting ecosystem objectives or otherwise
is in acceptable condition.
| | FAIR. The ecosystem component is currently
exhibiting minimally acceptable conditions, but it is
not meeting established ecosystem objectives, criteria,
or other characteristics of fully acceptable conditions.
POOR. The ecosystem component is severely
negatively impacted and it does not display even
minimally acceptable conditions.
| | MIXED. The ecosystem component displays both
good and degraded features.
I I UNDETERMINED. Data are not available or are
insufficient to assess the status of the ecosystem
component.
Four categories were also used to denote current trends of the
ecosystem component (coded by shape in this Highlights
report):
IMPROVING. Information provided shows the
ecosystem component to be changing toward more
acceptable conditions.
UNCHANGING. Information provided shows the
ecosystem component to be neither getting better nor
worse.
DETERIORATING. Information provided shows the
ecosystem component to be departing from
acceptable conditions.
UNDETERMINED. Data are not available to assess
the ecosystem component over time, so no trend can
be identified.
For many indicators, ecosystem objectives, endpoints,
or benchmarks have not been established.
For these indicators, complete assessments are
difficult to determine.
Indicator Category Assessments and
Management Challenges
CONTAMINATION
The transfer of natural and
human-made substances
from air, sediments,
ground-water, wastewater,
and runoff from non-point
sources is constantly
changing the chemical
composition of the Great
Lakes. Over the last 30
years, concentrations of
some chemicals or chemical groups have declined significantly.
There is a marked reduction in the levels of toxic chemicals in air,
water, biota, and sediments. Many remaining problems are
associated with local regions such as Areas of Concern. However,
concentrations of several other chemicals that have been recently
detected in Great Lakes have been identified as chemicals of
emerging concern.
Contamination
Contaminants in Waterbirds
Levels of most
contaminants in herring
gull eggs continue to
decrease in all the Great
Lakes colonies monitored,
although concentration
levels vary from good in
Lake Superior, to mixed in
Lake Michigan, Lake Erie
and Lake Huron, to poor
in Lake Ontario. While the
frequency of gross effects of contamination on wildlife has
subsided, many subtle (mostly physiological and genetic) effects
that were not measured in earlier years of sampling remain in
herring gulls. Concentrations of flame-retardant polybrominated
diphenyl ethers (PBDEs) are increasing in herring gull eggs.
Concentrations of most organic contaminants in the offshore
waters of the Great Lakes are low and are declining, indicating
progress in the reduction of persistent toxic chemicals. Indirect
inputs of in-use organochlorine pesticides are most likely the
current source of entry to the Great Lakes. Continuing sources
of entry of many organic contaminants to the Great Lakes
include indirect inputs such as atmospheric deposition,
agricultural land runoff, and resuspension of contaminated
sediments. Overall, mercury concentrations in offshore waters
are well below water quality guidelines. Mercury concentrations
in waters near major urban areas and harbors, however, exceed
water quality criteria for protection of wildlife. The spatial
distribution of polycyclic aromatic hydrocarbons (PAHs)
reflects the major source from the burning of fossil fuels.
Concentrations of PAHs are therefore higher in the lower lakes,
where usage is greater.
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State of the Great Lakes 2007
Concentrations of Total Mercury (ng/L)
Total Mercury (ng/L)
0.0-0,7
o 0.7-1,3
1.3-2.6
2.6-5.0
50+
The Canadian Water Quality Guideline for the protection of freshwater life is
26 parts per trillion (26 ng/L).
The U.S. Environmental Protection Agency's Great Lakes Initiative (GLI) water
quality criterion for the protection of wildlife is 0.0013 \igli (1.3 ng/L).
Source: State of the Great Lakes 2007 report
The status of atmospheric deposition of toxic chemicals is
mixed and improving for polychlorinated biphenyls (PCBs),
banned organochlorine pesticides, dioxins, and furans, but
mixed and unchanging or slightly improving for PAHs and
mercury across the Great Lakes. For Lake Superior, Lake
Michigan, and Lake Huron, atmospheric inputs are the largest
source of toxic chemicals due to the large surface areas of these
lakes. While atmospheric concentrations of some substances
are very low at rural sites, they may be much higher in some
urban areas.
Gas Phase PCB Concentrations in Air
120° n for Rural and Urban Areas
1000
800
600-
400
200-
*-u _ 1Mb
, rm
1
Superior Michigan Huron Erie Ontario Chicago Cleveland
Source: State of the Great Lakes 2007 report
Juvenile spottail shiner, an important preyfish species in the
Great Lakes, is a good indicator of nearshore contamination
Mean Total DDT Levels in Juvenile Spottail Shiners
ZOO-
'S
a 150-
|r
g 100-
& 50-
Iniflfl in
i i i n n i i ii ii i
Indicates the wildlife protection
guideline of 14 ng/g for DDT
nn nn|nn n n
III II 1 1 II II 1 1 n II I
K^
Year
Photo credit: U.S. Environmental Protection
because the species limits its distribution to localized, nearshore
areas during its first year of life. Total dichlorodiphenyltrichloro-
ethane (DDT) in juvenile spottail shiner has declined over the
last 30 years but still exceeds GLWQA criteria at most locations.
Concentrations of PCBs in juvenile spottail shiner have
decreased below the GLWQA guideline at many, but not all, sites
in the Great Lakes.
The status of contaminants
in lake trout, walleye and
smelt as monitored
annually in the open waters
of each of the Great Lakes
is mixed and improving for
PCBs, DDT, toxaphene,
dieldrin, mirex, chlordane,
Asency and mercury.
Concentrations of PBDEs and other chemicals of emerging
concern such as perfiourinated chemicals, however, are
increasing. Both the United States and Canada continue to
monitor for these chemicals in whole fish tissues and have over
30 years of data to support the status and trends information.
Phosphorus concentrations in the Great Lakes were a major
concern in the 1960s and 1970s, but private and government
actions have reduced
phosphorus loadings,
thus maintaining or
reducing phosphorus
concentrations in
open waters.
However, high
phosphorus
concentrations are
still measured in
Photo credit: Tip of the Mitt Watershed Council SOme embaymentS
harbors, and nearshore areas. Nuisance growth of the green alga
Cladophom has reappeared along the shoreline in many places
and may be related, in part, to increased availability of
phosphorus.
Management Challenges:
Presently, there are no standardized analytical monitoring
methods and tissue residue guidelines for new contaminants
and chemicals of emerging concern, such as PBDEs.
PCBs from residual sources in the United States, Canada,
and throughout the world enter the atmosphere and are
transported long distances. Therefore, atmospheric
deposition of PCBs to the Great Lakes will still be significant
at least decades into the future.
Assessment of the capacity and operation of existing sewage
treatment plants for phosphorus removal, in the context of
increasing human populations being served, is warranted.
Cladophora Bloom
Source: State of the Great Lakes 2007 report
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Highlights
Monitoring of tributary, point source, and urban and rural
non-point source contributions of phosphorus will allow
tracking of various sources of phosphorus loadings.
Investigating the causes of Cladophom reappearances will
aid in the reduction of its impacts on the ecosystem.
Chemical Integrity of the Great Lakes-What the Experts are Saying
In addition to the ecosystem information derived from
indicators, six presentations on the theme of "Chemical
Integrity of the Great Lakes" were delivered at SOLEC 2006
by Great Lakes experts. The definition of Chemical Integrity
proposed by SOLEC is "the capacity to support and maintain
a balanced, integrated and adaptive biological system having
the full range of elements and processes expected in a region's
natural habitat." James R. Kan, 1991 (modified)
The presentations focused on the status of anthropogenic
(man-made) contaminants and imbalances in naturally-
occurring chemicals in the Great Lakes basin. The key points
of each presentation are summarized here.
Anthropogenic Chemicals
Ron Hites, Indiana University: While concentrations of
banned or regulated toxic substances such as PCBs and
PAHs have decreased over the past 30 years, the rate of
decline has slowed considerably over the past decade.
Virtual elimination of most of these chemicals will not
occur for another 10 to 30 years despite restrictions or bans
on their use. Further decreases in the environmental
concentrations of PCBs, PAHs, and some pesticides may
well depend on emission reductions in cities.
Derek Muir, Environment Canada: Some 70,000
commercial and industrial compounds are now in use, and
an estimated 1,000 new chemicals are introduced each year.
Several chemical categories have been identified as
chemicals of emerging concern, including polybrominated
diphenyl ethers (flame retardants), perfluorooctanyl
sulfonate (PFOS) and carboxylates, chlorinated paraffins
and naphthalenes, various pharmaceutical and personal
care products, phenolics, and approximately 20 currently-
used pesticides. PBDEs, siloxanes and musks are now
widespread in the Great Lakes environment.
Implementation of a more systematic program for
monitoring new persistent toxic substances in the Great
Lakes will require significant investments in
instrumentation and researchers.
Joanne Parrot, Environment Canada: Some
Pharmaceuticals and personal care products appear to
cause negative effects in aquatic organisms at very low
concentrations in laboratory experiments. Some municipal
wastewater effluents within the Great Lakes discharge
concentrations of these products within these ranges. There
is some evidence that fish and turtles show developmental
effects when exposed to municipal wastewater effluent in
the laboratory. Whether these effects appear in aquatic
organisms including invertebrates, fish, frogs, and turtles, in
environments downstream of municipal wastewater
effluent is not known, indicating the need for more research
in this area.
Naturally-occurring Chemicals
Harvey Bootsma, University of Wisconsin-Milwaukee:
Changes in levels of nitrate, chloride and phosphorus in
Great Lakes waters are attributed to human activities, with
potential effects on phytoplankton and bottom-dwelling
algae. Changes in lake chemistry, shown through variations
in calcium, alkalinity, and even chlorophyll, are linked to
the biological activity of non-native species. Non-native
species also appear to be altering nutrient cycling pathways
in the Great Lakes, by possibly intercepting nearshore
nutrients before they can be exported offshore and
transferring them to the lake bottom.
Susan Watson, Environment Canada: The causes and
occurrences of taste and odor impairments in surface
waters are widespread, erratic, and poorly characterized but
are likely caused by volatile organic compounds produced
by species of plankton, benthic organisms, and
decomposing organic materials. In recent years, there has
been an increase in the frequency and severity of nuisance
algae such as Cladophora outbreaks in the Great Lakes,
particularly in the lower Great Lakes. Type E botulism
outbreaks and resulting waterbird deaths continue to occur
in Lake Michigan, Lake Erie and Lake Ontario.
David Lam, Environment Canada: Models and supporting
monitoring data are used to predict Great Lakes water
quality. A post-audit of historical models for Great Lakes
water quality revealed the general success of setting target
phosphorus loads to reduce open water phosphorus
concentrations.
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State of the Great Lakes 2007
HUMAN HEALTH
Levels of PCBs in sportfish
continue to decline,
progress is being made to
reduce air pollution,
beaches are better assessed
and more frequently
monitored for pathogens,
and treated drinking water
quality continues to be
assessed as good. Although
concentrations of many
organochlorine chemicals in the Great Lakes have declined since the
1970s, sportfish consumption advisories persist for all of the Great
Lakes.
Human Health
The quality of
municipally-treated
drinking water is
considered good. The risk
of human exposure to
chemicals and/or
microbiological
contaminants in treated
drinking water is generally
low. However, improving
and protecting source
water quality (before
treatment) is important to
ensure good drinking
water quality.
Drinking Water
Photo credit: Environment Canada
Beaches
In 2005, 74 percent of
monitored Great Lakes
beaches in the United
States and Canada
remained open more than
95 percent of the
swimming season.
Postings, advisories or
closures were due to a
variety of reasons,
including the presence of E. coll
bacteria, poor water quality, algae
abundance, or preemptive beach
postings based on storm events
and predictive models. Wildlife
waste on beaches can be more of a
contributing factor towards
bacterial contamination of water
and beaches than previously
thought.
Beach Postings and Closures for 2005
Great Lakes Swimming Season
Number of beaches monitored in
the Great Lakes basin in 2005 was 1086.
D Beaches open 95% of
swimming season
LI Beaches posted 5-9% of
swimming season
Beaches posted > 10% of
swimming season
Source: State of the Great Lakes 2007 report
Concentrations of organochlorine
contaminants in Great Lakes
sportfish are generally decreasing.
However, in the United States, PCBs
drive consumption advisories of
Great Lakes sportfish. In Ontario,
most of the consumption advisories
for Great Lakes sportfish are driven
I by PCBs, mercury, and dioxins.
1 Toxaphene also contributes to
Photo credit: Environment Canada .- i - - r .r- \.
consumption advisories of sportfish
from Lake Superior and Lake Huron. Monitoring for other
contaminants, such as PBDEs, has begun in some locations.
Guide to Eating Ontario Sportfish
for PCB Concentrations in Lake Trout
Sensitive (women of
child-bearing age and
children under 15 years
of age) population limits
used In graph.
Lake Huron Lake Superior
Source: State of the Great Lakes 2007 report
Application of a Uniform Fish
Consumption Advisory for PCB
Concentrations in Chinook Salmon, 2003
Sensitive (women of
child-bearing age and
children under 15 years
of age) population limits
used in graph.
ited consumption
Lake Lake
Superior Ontario
Source: State of the Great Lakes 2007 report
Photo credit: Environment Canada
GOOD
FAIR
POOR
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Highlights
Overall, there has been significant progress in reducing air
pollution in the Great Lakes basin. However, regional pollutants,
such as ground-level ozone and fine particulates, remain a
concern, especially in the Detroit-Windsor-Ottawa corridor, the
Lake Michigan basin, and the Buffalo-Niagara area. Air quality
will be further impacted by population growth and climate
change.
Management Challenges:
Maintenance of high-quality source water will reduce costs
associated with treating water, promote a healthier
ecosystem, and lessen potential contaminant exposure to
humans.
Although the quality
of treated drinking
water remains good,
care must be taken to
maintain water
treatment facilities.
One-fourth of
monitored beaches
still have beach
postings or closures.
A decline in SOme Photo credit: City of Toronto
contaminant concentrations has not eliminated the need for
Great Lakes sportfish consumption advisories.
Most urban and local air pollutant concentrations are
decreasing. However, population growth may impact future
air pollution levels.
BIOTIC COMMUNITIES
Despite improvements in
levels of contaminants in
the Great Lakes, many
biological components of
the ecosystem are severely
stressed. Populations of the
native species near the base
of the food web, such as
Diporeia and species of
zooplankton, are in decline
in some of the Great Lakes.
Native preyfish populations have declined in all lakes except Lake
Superior. Significant natural reproduction of lake trout is occurring
in Lake Huron and Lake Superior only. Walleye harvests have
improved but are still below fishery target levels. Lake sturgeon are
locally extinct in many tributaries and waters where they once
spawned and flourished. Habitat loss and deterioration remain the
predominant threat to Great Lakes amphibian and wetland-
dependent bird populations.
Biotic Communities
IMPROVING UNCHANGING DETERIORATING UNDETERMINED
Diporeia
The aquatic food web is
severely impaired in all the
Great Lakes with the
exception of Lake
Superior. Zooplankton
populations have declined
dramatically in Lake
Huron, and a similar
decline is occurring in
Lake Michigan.
Populations of Diporeia,
the dominant native benthic
(bottom-dwelling)
invertebrate in offshore waters,
continue to decline in Lake
Huron, Lake Michigan, and
Lake Ontario, and they may be
locally extinct in Lake Erie.
The decline of Diporeia
coincides with the
introduction of non-native
zebra and quagga mussels. Both zooplankton and Diporeia are
crucial food sources for many other species, so their population
size and health impact the entire system.
Photo credit: National Oceanographic and
Atmospheric Administration
Diporeia Density
2000
2005
Diporeia Density (numbers/m2x 103)
Source: State of the Great Lakes 2007 report
The current mix of native
and non-native (stocked
and naturalized) prey and
predator fish species in the
system has confounded the
natural balance within
most of the Great Lakes. In
all but Lake Superior,
native preyfish populations
have deteriorated.
However, the recent decline
of non-native preyfish (alewife and smelt) abundance in all Great
Lakes except Lake Superior could have positive impacts on other
preyfish populations. Preyfish populations are important for their
role in supporting predator fish populations, so the potential
effects of these changes will be a significant factor to be considered
in fisheries management decisions.
Preynsh
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State of the Great Lakes 2007
Despite basin-wide efforts to restore lake trout populations that
include stocking, harvest limits, and sea lamprey management,
lake trout have not established self-sustaining populations in
Lake Michigan, Lake Erie, and Lake Ontario. In Lake Huron,
substantial and widespread
natural reproduction of lake
trout was observed starting in
2004 following the near
collapse of alewife populations.
This change may have been due
to the reduced predation on
juvenile lake trout by adult
alewives and the alleviation of a
Photo credit: (c) Shedd Aquarium/ . .
www.fishphotos.org trout vitamin deficiency
problem caused by trout consuming alewives. In Lake Superior,
lake trout stocks have recovered such that hatchery-reared trout
are no longer stocked.
Reductions in phosphorus loadings during the 1970s
substantially improved
spawning and nursery habitat
for many fish species in the
Great Lakes. Walleye harvests
have improved but are still
below target levels. Lake
sturgeon are now locally extinct
in many tributaries and waters
where they once spawned and
flourished, although some
remnant lake sturgeon
populations exist throughout
the Great Lakes. Spawning and
rearing habitats have been
destroyed, altered or access to
them blocked. Habitat
restoration is required to help
re-establish vigorous lake
i .. Photo credit: (c) Shedd Aquarium/
sturgeon populations. www.fishphotos.org
From 1995 to 2005, the
American toad, bullfrog,
chorus frog, green frog,
and northern leopard frog
exhibited significantly
declining population
trends while the spring
peeper was the only
amphibian species that
exhibited a significantly
increasing population
trend in Great Lakes coastal wetlands. For this same time period,
14 species of wetland-dependent birds exhibited significantly
declining population trends, while only six species exhibited
significantly increasing population trends.
Amphibians
Trends of Amphibian Species from 1995-2005
Bullfrog Chorus Frog
Source: State of the Great Lakes 2007 report
The Great Lakes are now facing a challenge from viral
hemorrhagic septicemia (VHS). This virus has affected at least
37 fish species and is associated with fish kills in Lake Huron,
Lake St. Clair, Lake Erie, Lake Ontario, and the St. Lawrence
River.
Management Challenges:
Management actions to address the decline of Diporeia may
be ineffective until the underlying causes of the declines are
identified.
The decline of Diporeia coincides with the spread of non-
native zebra and quagga mussels. Cause and effect linkages
between non-native species in the Great Lakes and
ecological impacts may be difficult to establish.
Identification of remnant lake sturgeon spawning
populations should assist the selection of priority
restoration activities to improve degraded lake sturgeon
spawning and rearing
habitats.
Protection of high-
quality wetland
habitats and adjacent
upland areas will help
support populations of
wetland-dependent
birds and amphibians. Photo credit: Lang Elliot, NatureSound Studio
INVASIVE SPECIES
[nvasive Species
Activities associated with
shipping are responsible for
over one-third of the
aquatic non-native species
introductions to the Great
Lakes. Total numbers of
non-native species
introduced and established
in the Great Lakes have
increased steadily since the
1830s. However, numbers
of ship-introduced aquatic species have increased exponentially
GOOD
FAIR
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MIXED UNDETERMINED
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Highlights
during the same time period. High population density, high-
volume transport of goods, and the degradation of native
ecosystems have also made the Great Lakes region vulnerable to
invasions from terrestrial non-native species. Introduction of these
species is one of the greatest threats to the biodiversity and natural
resources of this region, second only to habitat destruction.
raid Ash Bor
Photo credit: Environment Canada,
Technical Operations
Photo credit: Michigan Sea Grant
Level of Impact of Non-native Terrestrial Species
on the Great Lakes Ecosystem
Slight Moderate
Impact
Source: State of the Great Lakes 2007 report
There are currently 183
known aquatic and 124
known terrestrial non-
native species that have
become established in the
Great Lakes basin. Non-
native species are
pervasive throughout the
Great Lakes basin, and
they continue to exert
impacts on native species
and communities. Approximately 10 percent of aquatic non-
native species are considered invasive and have an adverse effect,
causing considerable ecological, social, and economic burdens.
Both aquatic and terrestrial wildlife habitats are adversely
impacted by invasive species. The terrestrial non-native emerald
ash borer, for example, is a tree-killing beetle that has killed
Aquatic Non-native Species
IMPROVING UNCHANGING DETERIORATING UNDETERMINED
Photo credit: Dave Cappaert, Michigan State
University
more than 15 million trees
in the state of Michigan
alone as of 2005. The
emerald ash borer probably
arrived in the United States
on solid wood packing
material carried in cargo
ships or airplanes
originating from its native
Asia.
Introductions of non-native invasive species as a result of world
trade and travel have increased steadily since the 1830s and will
continue to rise if prevention measures are not improved. The
Great Lakes basin is particularly vulnerable to non-native
invasive species because it is a major pathway of trade and is an
area that is already disturbed.
Release Mechanisms for Aquatic
Non-native Species Established in the
Great Lakes Basin Since the 1830s
Halleetweter Accidental unknown Cultivation Canal Deliberate Solid belleet Aquerlum Netural Rellroede
ralaale mleaM leleaae raleaM mean* and
highway!
Primary mechanism
Source: State of the Great Lakes 2007 report
Management Challenges:
A better understanding of the entry routes of non-native
invasive species would aid in their control and prevention.
Prevention and control require coordinated regulation and
enforcement efforts to effectively limit the introduction of
non-native invasive species.
Prevention of unauthorized ballast water exchange by ships
will eliminate one key pathway of non-native aquatic species
introductions to the Great Lakes.
The unauthorized release, transfer, and escape of introduced
aquatic non-native species and private sector activities
related to aquaria, garden
ponds, baitfish, and live
food fish markets need to be
considered.
Invasive Species Control
Photo credit: P. Charlebois, Illinois Natural
History Survey/Illinois-Indiana Sea Grant
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State of the Great Lakes 2007
COASTAL ZONES AND AQUATIC HABITATS
Coastal Zones and Aquatic Habitats
Coastal habitats are
degraded due to
development, shoreline
hardening and
establishment of local
populations of non-native
invasive species. Wetlands
continue to be lost and
degraded. In addition to
providing habitat and
feeding areas for many
species of birds, amphibians and fish, wetlands also serve as a
refuge for native mussels and fish that are threatened by non-native
invasive species.
The Great Lakes coastline is more than 17,000 kilometers
(10,563 miles) long. Unique habitats include more than 30,000
islands, over 950 kilometers (590 miles) of cobble beaches, and
over 30,000 hectares (74,131 acres) of sand dunes. Each coastal
zone region is subject to a combination of human and natural
stressors such as agriculture, residential development, point and
non-point sources of pollution, and weather patterns. The
coastal zone is heavily stressed, with many of the basin's 42
million people living along the shoreline.
Wetlands are essential for
proper functioning of
aquatic ecosystems. They
provide a refuge for native
fish and mussels from non-
native predators and
competitors. The Great
Lakes coastline includes
more than 200,000 hectares
Photo Credit: Ted Cline (494,000 acres) of Coastal
wetlands, less than half of the amount of wetland area that
existed prior to European settlement of the basin. An inventory
of Great Lakes coastal wetlands in 2004 demonstrated that Lake
Huron and Lake Michigan still have extensive wetlands,
Coastal Wetland Area by Type
within the Lakes of the Great Lakes System
n
=d
H Qj
Superior Huron
Michigan St. Clair
Lake
Erie
Ontario
especially barrier-protected wetlands. Reductions in wetland area
are occurring, however, due to filling, conversion to urban,
residential, and agricultural uses, shoreline modification, water
level regulation, non-native species invasions, and nutrient
loading. Stressors, such as these, may also impact the condition
of remaining wetlands and can threaten their natural function.
Wetland Plant Health
Coastal wetland plant
community health, which
is indicative of overall
coastal wetland health,
varies across the Great
Lakes basin. In general,
there is deterioration of
native plant diversity in
many wetlands as
shoreline alterations may
cause habitat degradation
and allow for easier invasion by non-native species.
Naturally fluctuating water levels are essential for maintaining
the ecological health of Great Lakes shoreline ecosystems,
especially coastal wetlands. Wetland plants and biota have
adapted to seasonal and long-term water level fluctuations,
allowing wetlands to be more extensive and more productive
than they would be if water levels were stable. In 2000, Great
Lakes water levels were lower than the 140-year average water
level measured from 1860-2000. Furthermore, many climate
change models predict lower water levels for the Great Lakes.
Coastal wetlands that directly border the lakes and do not have
barrier beaches may be able to migrate toward the lakes in
response to lower water levels. Inland and enclosed wetlands
would likely dry up and become arable or forested land.
Shoreline hardening,
primarily associated with
artificial structures that
attempt to control erosion,
can alter sediment
transport in coastal
regions. When the balance
of accretion and erosion of
sediment carried along the
shoreline by wave action
and lake currents is
disrupted, the ecosystem
functioning of coastal
wetlands is impaired. The
St. Clair, Detroit, and
Niagara Rivers have a
higher percentage of their
shorelines hardened than
anywhere else in the basin.
Photo credit: Environment Canada
Source: State of the Great Lakes 2007 report
GOOD
FAIR
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MIXED UNDETERMINED
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Highlights
Of the five Great Lakes, Lake Erie has the highest percentage of
its shoreline artificially hardened, and Lake Huron and Lake
Superior have the lowest percentages artificially hardened.
Groundwater is critical for maintaining Great Lakes aquatic
habitats, plants and animals. Human activities such as
groundwater withdrawals for municipal water supplies and
irrigation, and the increased proportion of impervious surfaces
in urban areas, have detrimentally impacted groundwater. On a
larger scale, climate change could further contribute to
reductions in groundwater storage.
Management Challenges:
Despite improvements in research and monitoring of
coastal zones, the basin lacks a comprehensive plan for long-
term monitoring of these areas. Long-term monitoring
should be an important component of a comprehensive
plan to maintain the condition and integrity of the coastal
zones and aquatic habitats.
An educated public is essential to ensuring wise decisions
about the stewardship of the Great Lakes basin ecosystem.
Protection of groundwater recharge areas, conservation of
water resources, informed land use planning, raising of
public awareness, and improved monitoring are essential
actions for improving groundwater quality and quantity.
RESOURCE UTILIZATION
Resource Utilization
Although water
withdrawals have
decreased, overall energy
consumption is increasing
as population and urban
sprawl increase throughout
the Great Lakes basin.
Human population growth
will lead to an increase in
the use of natural resources.
The population of the Great Lakes basin is approximately 42
million. Growth forecasts for the western end of Lake Ontario
(known as the Golden Horseshoe) predict that this portion of
the Canadian population will grow by an additional 3.7 million
people by 2031. Population size, distribution, and density are
contributing factors to resource use in the basin, although many
trends have not been adequately assessed. In general, resource
use is connected to economic prosperity and consumptive
behaviors.
Although the Great Lakes and their tributaries contain 20
percent of the world's supply of surface freshwater, less than one
percent of these waters is renewed annually through
IMPROVING UNCHANGING DETERIORATING UNDETERMINED
precipitation, run-off and
infiltration. The net basin
water supply is estimated
to be 500 billion liters (132
billion gallons) per day. In
2000, water from the Great
Lakes was used at a rate
equal to approximately 35
percent of the available
Photo credit: Environment Canada daily Supply. The majority
of water withdrawn is returned to the basin through discharge
or run-off. However, approximately seven percent is lost through
evapo-transpiration or depleted by human activities. Due to the
shutdown of nuclear power facilities and improved water
efficiency at thermal power plants, water use in Canada and the
United States has decreased since 1980. In the future, increased
pressures on water resources are expected to come from
population growth in communities bordering the basin, and
from climate change.
Water Withdrawals in the Great Lakes Basin,
by Sector Category as a Percentage of Total, 2000
Other
2.7%
hdustrial
10%
Note: The majority of the water withdrawn is returned to the basin.
Source: State of the Great Lakes 2007 report
Population size, geography, climate, and trends in housing size
and density all affect the amount of energy consumed in the
basin. Electricity generation was the largest energy-consuming
sector in the Great Lakes basin due to the energy required to
convert fossil fuels to electricity.
Total Secondary Energy Consumption in the
Great Lakes Basin, in Megawatt-hours (MWh)
Sector
Residential
Commercial
Industrial
Transportation
Electricity Generation
U.S. Basin Total Energy
Consumption -2000
478,200,000
314,300,000
903,900,000
714,000,000
953,600,000
Canadian Basin Total Energy
Consumption -2002
127,410,000
107,800,000
206,410,000
184,950,000
303,830,000
Source: State of the Great Lakes 2007 report
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State of the Great Lakes 2007
Population growth and
urban sprawl in the basin
have led to an increase in
the number of vehicles on
roads, fuel consumption,
and kilometers/miles
traveled. Over a ten year
period (1994-2004) fuel
consumption increased by
17 percent in the U.S. states
bordering the Great Lakes
and by 24 percent in the
province of Ontario. Kilometers/miles traveled within the same
areas increased 20 percent for the United States and 56 percent
for Canada. The increase in registered vehicles continues to
outpace the increase in licensed drivers.
Photo credit: Microsoft Office Clipart
Fuel Consumption in Ontario
and Great Lakes States
II
-U.S. Great Lakes States -
12 II
10 g*
1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004
Year
Source: State of the Great Lakes 2007 report
Management Challenges:
Increasing requests for water from communities bordering
the basin where existing water supplies are scarce or of poor
quality will require careful evaluation.
Energy production and conservation need to be carefully
managed to meet current and future energy consumption
demands.
Population growth and urban sprawl are expected to
challenge the current and future transportation systems and
infrastructures in the Great Lakes basin.
LAND USE-LAND COVER
Land Use-Land Cover
The Great Lakes basin
encompasses an area of
more than 765,000 square
kilometers (295,000 square
miles). How land is used
impacts not only water
quality of the Great Lakes,
but also biological
productivity, biodiversity,
and the economy.
Data from 1992 and 2002 indicate that forested land covered 61
percent of the Great Lakes basin and 70 percent of the land
immediately buffering surface waters, known as riparian zones.
The greater the forest coverage in a riparian zone, the greater the
capacity for the watershed to maintain biodiversity, store water,
regulate water temperatures, and limit excessive nutrient and
sediment loadings to the waterways. Urbanization, seasonal
home construction, and increased recreational use are among
the general demands being placed on forest resources
nationwide. Additional disturbances caused by lumber removal
and forest fires can also alter the structure of Great Lakes basin
forests. However, the area of forested lands certified under
sustainable forestry programs has significantly increased in
recent years, exemplifying continued commitment from forest
industry professionals to practices that help protect local
ecosystem sustainability. Continued growth in these practices
will lead to improved soil and water resources and increased
timber productivity in areas of implementation.
Percent Forested Land Within Riparian Zones
by Watershed in the Great Lakes Basin
Source: State of the Great Lakes 2007 report
Under the pressure of rapid population growth in the Great
Lakes region, urban development has undergone unprecedented
growth. Sprawl is increasing in rural and urban fringe areas of
the Great Lakes basin,
placing a strain on
infrastructure and
consuming habitat in
areas that tend to have
healthier environments
than those that remain in
urban areas. This trend is
expected to continue,
which will exacerbate
other problems, such as
longer commute times photo Credit: L) Betts> courtesy of the Natural
^ Resources Conservation Service
GOOD
FAIR
POOR
MIXED UNDETERMINED
1O
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Highlights
from residential to work areas, increased consumption of fossil
fuels, and fragmentation of habitat. For example, at current
development rates in Ontario, residential building projects are
predicted to consume some 1,000 square kilometers (386 square
miles) of the countryside, an area double the size of Toronto, by
2031. Also, vehicle gridlock could increase commuting times by
45 percent, and air quality could decline due to an estimated 40
percent increase in vehicle emissions.
In 2006, The Nature Conservancy Great Lakes Program and the
Nature Conservancy of Canada Ontario Region released the
Binational Conservation Blueprint for the Great Lakes. The
Blueprint identified 501 areas across the Great Lakes that are a
priority for biodiversity conservation. The Blueprint was
developed by scientifically and systematically identifying native
species, natural communities, and aquatic system characteristics
of the region, and determining the sites that need to be
preserved to ensure their long-term survival.
Management Challenges:
As the volume of data on land use and land conversion
grows, stakeholder discussions will assist in identifying the
associated pressures and management implications.
Comprehensive land use planning that incorporates "green"
features, such as cluster development and greenway areas,
will help to alleviate the pressure from development.
Managing forest lands in ways that protect the continuity of
forest cover can allow for habitat protection and wildlife
species mobility, therefore maintaining natural biodiversity.
Policies that favor an economically viable forestry industry
will motivate private and commercial landowners to
maintain land in forest cover versus conversion to
alternative uses such as development.
CLIMATE CHANGE
A qualitative assessment of
the indicator category
Climate Change could not
be supported for this report
because the indicators are
incomplete at this time.
Some observed effects in the
Great Lakes region, however,
have been attributed to
changes in climate. Winters
are getting shorter, annual
average temperatures are
growing warmer, extreme heat events are occurring more
frequently; duration of lake ice cover is decreasing as air and water
temperatures are increasing; and heavy precipitation events, both
rain and snow, are becoming more common.
Photo credit: Environment Canada
IMPROVING UNCHANGING DETERIORATING UNDETERMINED
Low Water Levels
Photo credit: National Aeronautics and Space Administration Goddard Space Flight Center,
MODIS Rapid Response
Continued declines in the duration and extent of ice cover on
the Great Lakes and possible declines in lake levels due to
evaporation during the
winter are expected to
occur in future years. If
water levels decrease as
predicted with increasing
temperature, shipping
revenue may decrease and
the need for dredging
could increase. Northward
migration of species
naturally found south of
the Great Lakes region and
invasions by warm water, non-native aquatic species will likely
increase the stress on native species. A change in the distribution
of forest types and an increase in forest pests are expected. An
increase in the frequency of winter run-off and intense storms
may deliver more non-point source pollutants to the lakes.
Management Challenges:
Increased modeling, monitoring, and analysis of the effects
of climate change on Great Lakes ecosystems would aid in
related management decisions.
Increased public awareness of the causes of climate change
may lead to more environmentally-friendly actions.
Photo credit: Environment Canada
11
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State of the Great Lakes 2007
What is Being Done to Improve
Conditions
In an effort to restore and preserve the Great Lakes, legislators,
managers, scientists, educators and numerous others are responding
to environmental challenges with multifaceted solutions. The
responses and actions referenced here are intended to serve as
examples of positive strides being taken in the Great Lakes basin to
improve ecosystem conditions. Examples from both Canada and
the United States and from each of the Great Lakes are included.
There are many more actions that could have been recognized in
this report. Each is an important part of our collective commitment
to a clean and healthy Great Lakes ecosystem.
Canada and the United States implement numerous actions
across the basin at national, regional and local scales. For
example, in Ontario, the City of Toronto is addressing water
pollution through the Wet Weather Flow Management Master
Plan, a long-term solution to reduce pollution from stormwater
and combined sewer overflows.
Communities, states, the U.S. Environmental Protection Agency
and local industry are working together to remediate
contaminated sediments in U.S. Areas of Concern (AOCs) with
funding provided through the U.S. Great Lakes Legacy Act. Since
inception of the Act in 2002, sediment remediation has been
completed at three U.S. AOC sites (Ruddiman Creek and
Ruddiman Pond in Michigan, Black Lagoon in Michigan, and
Newton Creek and Hog Island Inlet in Wisconsin).
The Oswego River AOC on Lake Ontario was delisted in 2006,
the first removal of an AOC designation in the United States. In
Canada, two AOCs have been delisted, both on Lake Huron
(Collingwood Harbour in 1994 and Severn Sound in 2003).
Delisting of an AOC occurs when environmental monitoring has
confirmed that the remedial actions taken have restored the
beneficial uses in the area and that locally derived goals and
criteria have been met.
>nment Canada
. Environmental
Protection Agency, Great Lakes National
Program Office
Effective actions are often based
on collaborative work. In 2005,
The Nature Conservancy, the
State of Michigan and The
Wye Marsh, Severn Sound
Forestland Group (a limited partnership), collaborated in a sale
and purchase agreement that created the largest conservation
project in Michigan's history. This purchase will protect more
than 110,000 hectares (271,000 acres) through a working forest
easement on 100,362 hectares (248,000 acres) and acquisition of
9,445 hectares (23,338 acres) in the Upper Peninsula of
Michigan. By connecting approximately one million hectares
(2.5 million acres), the project curbs land fragmentation and
incompatible development by establishing buffers around
conservation sites such as the Pictured Rocks National Lakeshore
and Porcupine Mountains Wilderness State Park.
Lake Superior
communities have
embraced a goal of zero
discharge of critical
chemical pollutants by
engaging in a number of
actions to remove
contaminants. Efforts to
reach this goal have
included electronic and
hazardous waste collection
events run by Earth
Photo credit: Superior Watershed Partnership
Keepers, a faith-based environmental initiative, which is based in
the Upper Peninsula of Michigan. On Earth Day 2006, over 272
metric tons (300 U.S. tons) of household hazardous waste,
primarily household electronics, were collected and properly
disposed or recycled. In Canada, through Ontario's mercury
Switch Out program, more than 11,500 mercury switches from
scrap automobiles were collected in 2005.
Research, monitoring
and assessment efforts
operating at various
geographic scales are the
backbone of
management actions and
decisions in the basin.
Coordinated monitoring
among Canadian and
United States federal,
provincial, state, and
university groups began
in 2003 to focus on
Photo credit: U.S. Environmental Protection Agency
Great Lakes National Program Office
Photo credit: Environment Canada
monitoring physical, biological, and chemical parameters with
monitoring occurring on a five-year rotation of one Great Lake
per year. A binational Great Lakes Monitoring Inventory has
been established that currently provides information on 1,137
monitoring programs in the basin. The International Joint
Commission maintains a Great Lakes - St. Lawrence Research
Inventory of the many funded projects that help increase our
knowledge about the structure and function of the Great Lakes
ecosystem.
Strategic planning occurs at basin-wide, lake-wide and local
scales. An example of strategic planning is the Canada-Ontario
Agreement, a federal-provincial agreement that supports the
12
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Highlights
restoration, protection, and conservation of the Great Lakes
basin ecosystem. To achieve the collective goals and results,
Canada and Ontario work closely with local and regional
governments, industry, community and environmental groups.
In the United States, more than 140 different federal programs
help fund and implement environmental restoration and
management activities in the basin. The Great Lakes Water
Quality Agreement, Great Lakes Regional Collaboration and
Federal Task Force, Great Lakes Binational Toxics Strategy,
Lakewide Management Plans, Binational Partnerships, and
Remedial Action Plans are other examples of strategic planning
in the Great Lakes basin.
In many cases management and conservation actions are based
on or supported by federal, state, provincial, or local legislation.
For example, Ontario's Greenbelt Act of 2005 enabled the
creation of a Greenbelt Plan to protect about 728,437 hectares
(1.8 million acres) of environmentally-sensitive and agricultural
land in the Golden Horseshoe region from urban development
and sprawl. The Plan includes and builds upon approximately
324,000 hectares (800,000 acres) of land within the Niagara
Escarpment Plan and the Oak Ridges Moraine Conservation
Plan.
Proving that some legislation effectively crosses national
borders, in December, 2005, the Great Lakes Governors and
Premiers signed the Annex 2001 Implementing Agreements at the
Council of Great Lakes Governors Leadership Summit that will
provide unprecedented protection for the Great Lakes-St.
Lawrence River basin. The agreements detail how the states and
provinces will manage and protect the basin and provide a
framework for each state and province to enact laws for its
protection, once the agreement is ratified.
Education and outreach about Great Lakes environmental
issues are essential actions for fostering both a scientifically-
literate public as well as informed decision-makers. The Lake
Superior Invasive-Free Zone Project involves community groups
in the inventorying and control of non-native invasive terrestrial
and emergent aquatic plants through education. The project
combines Canadian and United States programs at federal, state,
provincial, municipal, and local levels and has the goal of
eliminating non-native plants within a designated 291 hectare
(720 acre) area.
A shoreline stewardship manual developed for the southeast
shore of Lake Huron and promoted through workshops and
outreach programs encourages sustainable practices to improve
and maintain the quality of groundwater and surface water and
the natural landscape features that support them. The Lake
Huron Stewardship Guide is a collaborative effort by the Huron
County Planning Department, the University of Guelph, the
Huron Stewardship Council, the Ausable Bayfield Conservation
Authority, the Lake Huron Centre for Coastal Conservation, and
the Friends of the Bayfield River, and a high level of community
engagement has been instrumental in its success.
The Great Lakes Conservation Initiative of the Shedd Aquarium
in Chicago aims to draw public attention to the value and
vulnerabilities of the Great Lakes. With collaboration by Illinois-
Indiana Sea Grant and the U.S. Fish and Wildlife Service, the
Shedd Aquarium opened a new exhibit in 2006 which features
many of the invasive species found in the Great Lakes. This
exhibit provides public audiences with the opportunity to see
many of these live animals and plants, and is also highlighted in
teacher workshops.
As these examples show, there is much planning, information
gathering, research and education occurring in the Great Lakes
basin. Much more remains to be done to meet the goals of the
GLWQA, but progress is being made with the involvement of all
Great Lakes stakeholders.
Source: Ontario Ministry of Municipal Affairs and Housing
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State of the Lakes Ecosystem Conference
The State of the Lakes Ecosystem Conferences (SOLEC) are hosted
by the U.S. Environmental Protection Agency and Environment
Canada every two years in response to the reporting requirements
of the Great Lakes Water Quality Agreement.
The conferences and reports provide independent, science-based
reporting on the state of the health of the Great Lakes basin
ecosystem. Four objectives for the SOLEC process include:
To assess the state of the Great Lakes ecosystem based on
accepted indicators
To strengthen decision-making and environmental
management concerning the Great Lakes
To inform local decision makers of Great Lakes
environmental issues
To provide a forum for communication and networking
amongst all the Great Lakes stakeholders
The role of SOLEC is to provide clear, compiled information to
the Great Lakes community to enable environmental managers to
make better decisions. Although SOLEC is primarily a reporting
venue rather than a management program, many SOLEC
participants are involved in decision-making processes throughout
the Great Lakes basin.
For more information about Great Lakes indicators and the State
of the Lakes Ecosystem Conference, visit:
www.binational.net
www.epa.gov/glnpo/solec
www.on.ec.gc.ca/solec
State of the
Great Lakes
2007
Highlights
by the Governments of
Canada
and
The United States of America
Prepared by
Environment Canada
and the
U.S. Environmental Protection Agency
Photo credit: Environment Canada
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