BISC302 Lecture 7: Notes
24 Sep 2016
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Document Summary
Aquatic organisms have different challenges depending on the environment. Denture enzymes, may lead to dehydration, osmotic stresses. Slow reactions, affect properties of membranes, slowing functions. Convection: sensible heat transfer (heat loss or gain) In some ways related to heat -- evaporation. But there"s more to it because osmoregulation is also important. Plants and animals have analogous pathways of water gain and loss. Terrestrial organisms also need to retain water/balance salts. Only birds and mammals are capable of creating urine more concentrated than their blood. Specializations: c3 (typical), c4 (high light conditions), cam (take in co2 at night) Rate of photosynthesis dependent on several environmental variables. Plant species are generally adapted to high or low light conditions. But that means less heat is lost to convection. But hairs are expensive and decrease photosynthetic efficiency. Parallel or oblique to sun = lower loss. Some are able to crank up metabolism (ex skunk cabbage)
