BIS 2B Lecture Notes - Lecture 5: Cannibalism, Stoma, Transpiration

• School: UC-Davis
• Department: Biological Sciences
• Course: BIS 2B
• Professor: Mark Schwartz; Sharon Strauss

Document Summary

Ectotherms rely on morphological and behavioral mechanisms of temp. regulation. Endotherms also regulate body temp using behavioral mechs, but they just primarily use their own heat source. Have a high benefit-high cost strategy that works when they assume there are resources (sweating but losing water) shape of an enzyme determines body temp. Hot = too loose cold = too tight. Dark pigment for coloration limited to coldest areas of the body (extremities) Plant hydration they can sweat = losing water through stomata via transpiration and evaporation. Adaptations to help with retention and cooling: small/vertical leaves low surface area, volume ratio. Deep tap roots shedding leaves reduce stomata density or opening (but reduces co2 uptake) store water in times of plenty. Alternate photosynthetic systems can alter co2 gradient and change time of stomatal opening. Life history of organisms shows how, when and where life cycle events occur.