BIO205H5 Lecture Notes - Lecture 4: Theodosius Dobzhansky, Countercurrent Exchange
Document Summary
Instead of having arteries, just have the arteries warm up the veins to body temperature by having the 2 vessels close to each other. Skunk cabbage - one of the first plants in early spring, can produce flowers in the snow. They have mitochondria that can warm themselves up to +10. Why do we need to consider adaptations? i. ii. e. g. coral bleaching events. Coral - symbiosis out of cnidarians and algae (coral organisms). Increase temp -> increase acidity (they have a very sharp range, just + ), algae symbionts (coral) adapted to narrow temperature will be ejected. e. g. goldfish have a higher t range. Gradual increase in temperature - relationship between water t and swimming speed - put to test for a few days - acclimated to. C - can swim really well in 18 deg. Organisms can adapt to particular environment to increase performance. iii. Nothing in biology makes sense except in the light of evolution- t. dobzhansky.
