Current Ecological Issues of the Great Lakes Jim Diana, Director Michigan Sea Grant College Program.
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Transcript of Current Ecological Issues of the Great Lakes Jim Diana, Director Michigan Sea Grant College Program.
![Page 1: Current Ecological Issues of the Great Lakes Jim Diana, Director Michigan Sea Grant College Program.](https://reader036.fdocuments.us/reader036/viewer/2022062518/56649f3a5503460f94c58907/html5/thumbnails/1.jpg)
Current Ecological Issues of the Great Lakes
Jim Diana, DirectorMichigan Sea Grant College Program
Current Ecological Issues of the Great Lakes
Jim Diana, DirectorMichigan Sea Grant College Program
![Page 2: Current Ecological Issues of the Great Lakes Jim Diana, Director Michigan Sea Grant College Program.](https://reader036.fdocuments.us/reader036/viewer/2022062518/56649f3a5503460f94c58907/html5/thumbnails/2.jpg)
The Great LakesThe Great Lakes
20% of world’s surface freshwater
5 of 9 largest lakes in world
Historic role in transportation and settlement
Large human population depending on the region
Multiple uses throughout history
20% of world’s surface freshwater
5 of 9 largest lakes in world
Historic role in transportation and settlement
Large human population depending on the region
Multiple uses throughout history
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Take Home MessageTake Home Message Humans have had a love – hate relationship with
the Great Lakes The lakes have served for economic, societal,
and ecological value since humans first set foot in this region
The lakes have suffered massive damage due to human misuse, both intentional and unintentional
The lakes have also rebounded dramatically due to human intervention and luck
Challenges remain for the future
Humans have had a love – hate relationship with the Great Lakes
The lakes have served for economic, societal, and ecological value since humans first set foot in this region
The lakes have suffered massive damage due to human misuse, both intentional and unintentional
The lakes have also rebounded dramatically due to human intervention and luck
Challenges remain for the future
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Early HistoryEarly History An important resource for aboriginal
communities – food, water, and transportation
An important resource for aboriginal communities – food, water, and transportation
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Early HistoryEarly History
An important transportation route for development and discovery of middle America
An important transportation route for development and discovery of middle America
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Early European HistoryEarly European History An important industrial resource for timber,
waste disposal, shipping, and food An important industrial resource for timber,
waste disposal, shipping, and food
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An Important PointAn Important Point
By the early 1800s, the lakes were already dramatically altered (the Cholera epidemic)
By the early 1800s, the lakes were already dramatically altered (the Cholera epidemic)
Year Deaths Rate Per 100,000
1849 678 2,897
1850 420 1,402
1851 216 635
1852 630 1,626
1854 1,424 2,162
1855 147 184
1866 990 494
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Clearing WetlandsClearing Wetlands
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Clearing WetlandsClearing Wetlands
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Ship CanalsShip Canals
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DamsDams
Miles from River Mouth0 10 20 30 40 50
Ele
vati
on
(fe
et)
450
500
550
600
650
700
NowThenMap courtesy of Troy Zorn, Michigan Dept. of Natural Resources
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LoggingLogging
•Very common in 1900s•Easy to catch•Degraded habitat from logging•Extinct in Michigan by 1930.
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Fishing Lake SturgeonFishing Lake Sturgeon
Year
1880 1890 1900 1910 1920 1930 1940 1950
Lan
din
gs
0
100
200
300
400
500
600
700
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Commercial FishingCommercial Fishing
0
2
4
6
8
10
12
14
1860 1880 1900 1920 1940 1960 1980
Yie
ld (
Mill
ion
Po
un
ds)
Whitefish in Lake Michigan
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High value Low value
Commercial FishingCommercial Fishing
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PollutionPollution
Cholera epidemic of Chicago, 1854 Sawdust, tannery effluent by 1900 Eutrophication from sewage discharge in the early
1900s PCB and DDT contamination from manufacture by
1960 Serious water contamination from industry, sawdust to
petroleum products and animal wastes
Airborne contaminants and contaminated sediments
Cholera epidemic of Chicago, 1854 Sawdust, tannery effluent by 1900 Eutrophication from sewage discharge in the early
1900s PCB and DDT contamination from manufacture by
1960 Serious water contamination from industry, sawdust to
petroleum products and animal wastes
Airborne contaminants and contaminated sediments
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Time Magazine (1965) – “Lake Erie is dead”
PollutionPollution
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The Common Carp
Deliberate introductionsCarp, Pacific salmon
Deliberate introductionsCarp, Pacific salmon
InvasionsInvasions
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InvasionsInvasions Unintentional introductions
Pink salmon, smelt
Unintentional introductionsPink salmon, smelt
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0
1
2
3
4
5
6
7
8
0
50
100
150
200
250
300
350
400
1930 1935 1940 1945 1950 1955 1960 1965
Lake
Tro
ut
Abu
nd
ance
Sea
Lam
pre
y A
bun
dan
ce
Lamprey
Lake Trout
Immigration through ship canalsSea lamprey
Immigration through ship canalsSea lamprey
InvasionsInvasions
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InvasionsInvasions
Immigration through ship canalsAlewife
Immigration through ship canalsAlewife
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Ballast waterZebra mussel
Ballast waterZebra mussel
InvasionsInvasions
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Ballast waterQuagga mussel, water flea, goby
Ballast waterQuagga mussel, water flea, goby
Round Goby Ruffe
BythotrephesQuagga Mussel
InvasionsInvasions
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Salmon FishingSalmon Fishing
Introduced 1969 to control alewife
Now multibillion dollar industry
Introduced 1969 to control alewife
Now multibillion dollar industry
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No predators
Overfishing
Lamprey
MassiveAlewifeDie-off
Lake Erie is dead
CuyahogaRiver burns
DDTBanned
LampreyControl
CleanWater
Act
Salmon stocked
DDT use banned
1966 1969 1972 1976
SalmonControl
Alewives
Lake troutReturn
PCB production
banned
1984
Alewives Decline
drastically
SportFishery
at $1Billion
RehabilitationRehabilitation
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The Future? – Lake HuronThe Future? – Lake HuronThe Future? – Lake HuronThe Future? – Lake Huron
In my view, this is the current ecological change that is most important to our future
Mussel invasion and increased water clarity Reduced plankton and changes in food web Loss of stocked salmonids Rebound of native species Change in economic conditions
In my view, this is the current ecological change that is most important to our future
Mussel invasion and increased water clarity Reduced plankton and changes in food web Loss of stocked salmonids Rebound of native species Change in economic conditions
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Mussels and clarityMussels and clarity Dreissenids consume energy and
nutrients that supported fishRound gobies have proliferated lakewide, can
feed heavily on Dreissena
Dreissenids consume energy and nutrients that supported fish
Round gobies have proliferated lakewide, can feed heavily on Dreissena
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Loss of PlanktonLoss of Plankton
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Change in Forage FishesChange in Forage Fishes
0
50
100
150
200
250
300
350
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
Bio
mas
s (k
iloto
nn
es)
round gobytroutperchsticklebacksculpinbloaterrainbow smeltalewife
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Loss of Chinook SalmonLoss of Chinook Salmon
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Rebound of NativesRebound of Natives
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Rebound of NativesRebound of Natives Similar trends in other native fishes Similar trends in other native fishes
Smallmouth bassDo we change from a fishery supported by stocking to a much lower production of natural fish?
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Economic effectsEconomic effects
Estimated $19 million loss in 10 coastal communities
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Another Problem: Asian CarpAnother Problem: Asian Carp
Imported by fish farms Escaped into the Mississippi Now very close to Lake
Michigan DNA in water of Calumet
Harbor
Imported by fish farms Escaped into the Mississippi Now very close to Lake
Michigan DNA in water of Calumet
Harbor
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Other Comparable Changes
Other Comparable Changes
Botulism spread through the system
Increased growth of nuisance algae and harmful algal blooms
Dead zones in deep water of Lake Erie
Botulism spread through the system
Increased growth of nuisance algae and harmful algal blooms
Dead zones in deep water of Lake Erie
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SummarySummary
Dramatic deterioration and cleanup Has required continual reaction and money input Has resulted in significant improvement and environmental
law Needs continual intervention
Dramatic deterioration and cleanup Has required continual reaction and money input Has resulted in significant improvement and environmental
law Needs continual intervention
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Contacts & QuestionsContacts & Questions
Jim Diana: [email protected]: (734) 763-5834
Web: www.miseagrant.umich.edu
Jim Diana: [email protected]: (734) 763-5834
Web: www.miseagrant.umich.edu