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FinalReview - Fish biodiversity Biogeographical...

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5/4/2010 1 Fish biodiversity http://maps.grida.no/go/graphic/fish-diversity-in-freshwater-systems Biogeographical Determinants of Fish Assemblage Diversity More diverse on large continents than small More diverse in old lakes and watersheds More diverse in tropics than temperate areas Glaciations, time… More diverse with more within-habitat diversity More diverse in larger rivers than small River size and diversity of fish Amazonian Basin ~ 2,500-3,500 Mississippi R. Basin ~ 375 Hudson Bay Basin ~ 100 Rio Grande Basin ~ 154 Lower Brazos River ~ 67 Lower Sabine River ~ 90 Lower San Antonio ~57 http://www.tamu.edu/upress/BOOKS/2007/bigthomas.jpg Fish Diversity with Distance Downstream 0 100 200 300 400 500 Distance from headwaters (km) 0 10 20 30 40 Number of species
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5/4/2010 2 Fish Diversity with Distance Downstream Large rivers less likely to dry Small streams/rivers more susceptible to debris torrents, catastrophic floods Large rivers – more habitat types (wetlands, oxbows, side channels, open channels, variety of water velocity) http://www.aslo.org/photopost/data/517/medium/8Fish_diversity_Amazon_backwater.jpg REVIEW Final exam: Saturday at 10:30 am 75 % new material 25 % old material Bring scantron http://www.bentler.us/eastern-washington/insects/blue-damselfly.jpg match Catostomidae Ictaluridae Cyprinidae Centrarchidae Percidea Perches/darters Suckers Carps/minnows Catfishes Sunfish/basses http://www.awag.org/Education/USGS_water_cycle.jpg Hydrologic cycle
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5/4/2010 3 G Review Water is most dense at ________ pH is a measure of what? __________ Oxygen levels increase/decrease with increasing salinity.
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