biodiversity of fishes on the boreal shield in ontario
DESCRIPTION
Biodiversity of Fishes on the Boreal Shield in Ontario. Class 10 Presentation 1. Thanks to. Nicholas E. Mandrak Research Scientist Great Lakes Laboratory for Fisheries and Aquatic Sciences Department of Fisheries and Oceans Burlington, ON. Outline. - PowerPoint PPT PresentationTRANSCRIPT
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Biodiversity of Fishes on the Boreal Shield
in Ontario
Class 10Presentation 1
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Thanks to
Nicholas E. MandrakResearch Scientist
Great Lakes Laboratory forFisheries and Aquatic Sciences
Department of Fisheries and OceansBurlington, ON
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Outline
Defines some of the biological diversity of fresh water fishes in Ontario
What are the threats to fish biodiversity?
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Biodiversity Includes
Species Subspecies Populations / Evolutionary Significant
Units (ESUs) Morphotypes Assemblages / Communities
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Species
128 native, 19 introduced fish species in Ontario.
Of the 128 species in 24 families, 5 were endemic to the Great Lakes
No species endemic solely to Ontario. Greatest fish species richness south of the
Shield.
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0 5 10 15 20 25 30 35 40
No. of Spp.
Paddlefishes
Trout-perches
Sturgeons
Smelts
Silversides
Mudminnows
Eels
Drums
Cods
Bowfin
Topminnows
Temperate Basses
Mooneyes
Gobies
Pikes
Herrings
Gars
Sticklebacks
Lampreys
Sculpins
Catfishes
Sunfishes
Suckers
Perches
Salmons and Trouts
Minnows
Native
Introduced
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Great Lakes CiscoesW
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Freshwater Fish RichnessW
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Species
Greatest fish species richness south of the Shield. Why?
Combination of what happened following the last Ice Age, current climate and water chemistry.
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postglacial dispersal, climate, water chemistry
morphometry, water chemistry
biotic interactions
modified from Tonn 1990
North America~600 spp.
NorthernNorth America
~130 spp.
Shield~60 spp.
Shield Lakes<30 spp.
evolutionary processes
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Postglacial DispersalW
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Postglacial DispersalW
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Mandrak and Crossman 1992
Some genes from fish that survived in Beringia refugia
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Mean Annual Air TemperatureW
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ProductivityW
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Species
Few species found in northern Ontario that are not found in south.
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1 cm
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Subspecies
No longer used by ichthyologists. None listed in official names list by
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Populations / ESUs Population - group of individuals of single
species inhabiting specific area, limited gene flow with other populations. Many populations restricted to single lakes (e.g.
headwater lakes). Evolutionary Significant Units (ESU) –
population, or group of populations, that is substantially reproductively isolated and represents an important component in the evolutionary legacy of the species.
Populations/ESUs of only a few species in Ontario identified, none comprehensively.
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Distributions of mtDNA lineages among lake trout populations
Wilson and Hubert (1996)
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Morphotypes Individuals of a species may exhibit
variation in physical characteristics = phenotypic variation.
May be result of: adaptation to:
different habitats (e.g. sunfishes) different prey to minimize competition (e.g. ciscoes
developing different gill rakers depending on food source)
predation (e.g. sticklebacks with different plates on their backs)
genetic drift caused by: isolation (founder effect) (e.g. Aurora trout isolated in
5 lakes) limited gene flow (e.g. lake trout, little migration)
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Algonquin CiscoesW
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Aurora troutW
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Aurora trout
Brook trout
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Communities
Communities – group of interacting species living in a specific area, or all species living in a given area.
Assemblages – limited to specific taxon (e.g. fishes)
Fish assemblages on Shieldsimpler than south of Shield fewer warmwater predators (e.g. basses)
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What are the threats to fish biodiversity?
1. Habitat alteration, loss
2. Overexploitation
3. Introduced species
4. Atmospheric pollution
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1. Habitat alteration and loss Habitat is the physical, chemical and biological
components in a species’ environment required for survival.
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1. Habitat alteration and loss In southern Ontario, agriculture and urbanization
e.g. habitat loss, runoff effects physical (turbidity) and chemical (nutrients) quality of water.
In northern Ontario, direct and indirect effects of resource extraction.e.g. logging directly affects water supply, physical
(turbidity) and chemical (nutrients) quality of water; logging roads have perched culverts, increased access leads to spread of overexploitation, introduced species.
e.g. mining tailings directly pollute water, smelting can lead to acid precipitation.
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Perched culverts
Mine tailings
Turbidity
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2. Overexploitation
Overfishing exceeds natural mortality of population, or targets spawning stock (typically larger individuals).
Commercial fishing in larger lakes. Recreational fishing in smaller lakes.
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2. OverexploitationT
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ity 1930s saw demise of commercial catch in L Huron due to over fishing. Sea lamprey may have had an effct as well
1950s saw demise of ciscoes due to over fishing. Ciscoes not affected by lamprey
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Great Lakes Ciscoes
Extinct
ExtinctExtirpated in GL
Extirpated in GL*
Extirpated in GL*
* Except Superior
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3. Introduced Species Species not native to an ecosystem,
introduced deliberately or accidentally. Deliberately through:
authorized stocking (outdated process) illegally to establish “glory hole” for sport or bait
fishes (seeding lakes) releasing unused bait or unwanted aquarium fishes.
Accidentally by ballast water, bait bucket water, boats, movement through canals.
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Smallmouth Bass
Introduced
Source: Checklist of Ontario Freshwater Fishes Annotated with Distribution Maps
(Mandrak and Crossman 1992)
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May have been in L Ontario spread to upper Gt Lakes after Welland Canal built
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3. Introduced Species
Potential impacts on native species: Habitat alteration or destruction (e.g. carp
uproot aquatic plants) Competition with, predation on, native
species. (e.g. lamprey, ruffe) Introduction of diseases and parasites
(e.g. whirling disease in trout)
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ruffe
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Vanden Zanden et al. 1999
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Using C13/12 ratio gives us idea of trophic position of fish. Higher ratio higher trophic position
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Atmospheric Pollution
Anthropogenic contributions to atmosphere can have far-reaching (e.g. global) effects on aquatic environments.
Acid precipitation, climate change.
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Acid Precipitation Direct effects: loss of fish populations Numerous indirect effects.
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Change in Mean Annual Temperature1990-2050
+2°C to 5°C
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Change in Mean Annual Temperature1990-2080
+5°C to 8°C
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Climate ChangeT
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Potential Effects Colonization of Shield by warmwater
introduced species and associated impacts (N.B. requires human assistance).
Negative impacts on cool- and cold- water fishes resulting local and regional decline in condition, abundance and range.
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Conclusions
Biodiversity at sub-specific levels largely Biodiversity at sub-specific levels largely unknown.unknown.
Threats: habitat degradation/loss; Threats: habitat degradation/loss; overexploitation; introduced species; overexploitation; introduced species; atmospheric pollution.atmospheric pollution.
Synergistic interaction of threats likely to Synergistic interaction of threats likely to be exacerbated by climate change.be exacerbated by climate change.
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Conclusions
Science NeedsScience Needs Identify biodiversity at sub-specific levels.Identify biodiversity at sub-specific levels. Identify limiting factors and threats.Identify limiting factors and threats. Identify mitigation and adaptation strategies.Identify mitigation and adaptation strategies.
Protection and Recovery NeedsProtection and Recovery Needs Identify gaps in protection .Identify gaps in protection . Identify and undertake recovery activities.Identify and undertake recovery activities.