BIOL 2903 Lecture 9: Week 9 Notes
4 Mar 2017
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Alders have nodules containing bacteria fixing nitrogen. Beavers provide sodium for moose (due to water plants in ponds) Dragonflies: eclosion: transformation from nymph (young stage) to adult, e. g. American toads, wood frogs (freeze-tolerant), mink frogs. Warmer water = more species = greater biodiversity. Minks along shorelines of ponds, have partially-webbed feet. Beaver ponds increase biodiversity of any region, esp in boreal forest: important sources of nitrogen & phosphorous, maintain water tables. Warmer, more developed soil on land, nutrients washed in: lots of fish, esp trout. Lots of fish-eating birds, like ospreys, bald eagles, common loons, common. Hooded mergansers around beaver ponds, common mergansers around lakes. Lentic ecosystem: still waters (e. g. , lakes, ponds: mosquitos lay their eggs here. Lotic ecosystem: flowing waters (e. g. streams, rapids: filter feeders e. g. net-spinning caddisflies, black flies larvae. Only females feed on blood: fast water = home for clubtail dragonflies, such as boreal snaketail. Elevations aren"t very high (350 m above sea level (asl))
