ENV100Y5 Lecture Notes - Lecture 38: Oa, Oxbow Lake, Trophic State Index
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ENV100Y5 Full Course Notes
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Document Summary
Shallow water allows plants to grow above water surface (emergents) Forms in acidic, low o2 conditions organic matter doesn"t fully decay; builds up the wetter it is, the faster it accumulates stores massive amounts of carbon. The most biologically diverse & productive ecosystems on earth. Important breeding and staging grounds for migrating species (esp. birds) No lakes older than 20 my; most are a few thousand. Among lakes: differences in productivity o: within lakes: temperatures profiles; seasonal variation; spatial variation o o o o o o o. Eutrophic: abundant nutrients fertility related to nutrient availability, age, substrate & climate young lakes: basin is exposed rock; few nutrients older lakes: nutrient-rich sediment washes in from watershed. Was pushed through as part of bill c-38 (budget implementation act) No longer protects fish habitat; only covers protection of economically important fisheries. Developers & industries building on exempt waterways don"t need to inform the governement or require a permit do so.
