BIOL 2060 Lecture Notes - Lecture 4: Countercurrent Exchange
21 Sep 2017
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Document Summary
Climate envelope modeling for threatened and endangered species. Using models to make predictions about how a system works. Not perfect, but can help our understanding. Step1: sample climate or habitat data for species presence/absence in a particular location. Step 2/3: create a prediction map based on current climate and extrapolate using future climate scenarios. Often because high or low temperatures reduce growth, reproduction, or increase mortality. Many organisms are able to regulate body temperature. Poikilotherms: body temperature varies directly with environmental temperature (plants can be considered, linear graph with ambient and outside temp) Pressed against the ground, reduce convective heat loss. Sitting on plant material reduces conductive heat loss to ground (insulation) Reflective surface reduces heat gain by radiation. Foliage above ground reduces heat gain by conduction. Parallel orientation reduces heat gain by radiation. Small dissected leaves increase exposure to win increase convective heat loses to wind. Trade off: losing one thing, but gaining another (orientation of the leaf)
