BIOL 4805 Exam 3.docx - BIOL Fishes Exam 3 Great Lakes...

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BIOL Fishes Exam 3Great Lakes “HOMES”Huron, Ontario, Michigan, Erie, SuperiorBathymetry - refers to the depth of the waterLaker Erie a very shallow lakeSpeciation - not much in the past 10,000 yearsAfrican Cichlids- most speciose group known on earth. Species FlockLake Victoria- massive amount of species. Pollution, overfishing decreased speciation. Nile Perch was introduced and the population of Cichlids fell off dramatically. Atlantic Salmon - first fish lost in the Great Lakes due to human activity, overfishingNatural Migration PatternBarriers - In the US mountain ranges run from North to South, as opposed to Europe where they run East to West. In the us this did not cut off species migration due to glaciation as it did on the European continent. Migration - anywhere from geographic time and space to fish lifetime or season. Pleistocene Period - advances of ice sheets, glaciersand movement caused a great deal of changes and migration. Glaciers - glaciated/unglaciated, complex and dynamic magins at the edges.Ohio - was glaciatedRefugia - a location which supports an isolated or relict population of a once more widespread species. An area in which a population of organisms can survive through a period of unfavorable conditions, especially glaciation.Glacial melting causes water masses to become connected allowing migration. Connections outside of the Great Lakes, disappeared over timeMississippi Refugium - 80-90% of fish from Mississippi River drainage. Warm water taxaConnections from glacial refugium caused diversity that shouldn't be there. Gars, Sturgeons, ancient lineages that were present thereCentrarchids, Perchids, CyprinidsAtlantic Refugium- migration to Lake OntarioSea Lamprey to Lake OntarioAlewife, HerringAtlantic Salmon- from Atlantic seaboard migration1st species lost from Great Lakes due to human activityLandlocked in Ontario because of blocked spawning migrations via mill damsArctic Refugium - Cold water taxaLake Trout Human Mediated Migration Pattern3 Methods- Ballast WaterNavigation CanalsFish StockingBallast Water Invasions- Human induced invasionsMost invasive species are bad for the ecosystemShips can carry invasive species in their ballast waterBallast Water- used to change buoyancy of ship, picked up invasive species of fishEurasian Rulf - invaded Lake Superior via ballast water1
BIOL Fishes Exam 3Round Goby - invaded Great Lakes via ballast water. Not aggressive until they invadedthe Great Lakes where they thrived.

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Term
Spring
Professor
ThomasP.Diggins
Tags
Ichthyology, Terms, Study Guide, INFO, Exam 3 Info

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