Biology 2485B Lecture 6: Lecture-6-Aquatic-Environments
11 Apr 2018
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Gulf that phosphorus has become the principal limiting factor on phytoplankton growth. Hydrologic cycle: red words fluxes, black words reservoirs, oceans are the biggest reservoir of water, ground water is also big reservoir of water, do(cid:374)"t (cid:374)eed to k(cid:374)o(cid:449) (cid:374)u(cid:373)(cid:271)ers i(cid:374) diagra(cid:373, precipitation and evaporation* Global water: picture shows the % of each type of water reservoir, freshwater lake zonation. Benthic zone zone against substrate of lake-bottom of lake. Littoral zone enough sunlight that gets to bottom of lake+plant growth (phytoplankton algae) Limnetic zone benthic part of lake starts within aphotic zone-no plant life in this zone: freshwater lake productivity the amount of life that a lake can support depends on the nutrient levels of the lake. Low high nutrients: oligotrophic lakes, low nutrient levels little plant growth, cold water supports high oxygen, very clear (high visibility, high oxygen levels near benthic zone, many fish species: lake trout, mesotrophic lakes.
