01:119:117 Study Guide - Final Guide: Lake Trout, Photic Zone, Eugenius Warming
3 Jan 2019
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Document Summary
Oligotrophic lake: nutrient-poor, clear lake with few phytoplankton. Photic zone: the narrow top layer of an ocean or lake, where light penetrates sufficiently for photosynthesis to occur. Turnover mixing of waters as a result of changing water-temperature profile in a lake. Also, brings o2 rich water in the surface to the bottom and nutrient rich water at the bottom to the surface. Trophic states are based on lake fertility and availability of nitrogen and phosphorus ( the production) Oligotrophic lakes are nutrient poor and generally oxygen-rich, with deep clear water, rocky and sandy bottoms, and very little algae. The fish found in oligotrophic lakes like cold, highly- oxygenated water, examples include lake trout and whitefish. Oxygen found at high levels throughout the water column. Cold water can holds more dissolved oxygen than warm. Low algal concentration allows deeper light penetration and less decomposition.
