BIO120H1 Lecture Notes - Lecture 15: Evaporation, Homeostasis, Body Plan

• School: UTSG
• Department: Biology
• Course: BIO120H1
• Professor: Spencer Barrett

Document Summary

One limiting factor (selected from several possibilities) heat exchange: radiation heat transfer by electromagnetic radiation from the sun. Heat balance especially important to homeotherms (birds, mammals: poikilotherms (most reptiles, amphibians, fish, invertebrates) lack physiological means to deviate from environmental temperature (although they use behavioural means); their temperatures fluctuate. Wednesday, november 1, 2017: homeotherms (must regulate heat balance to keep internal temperature within a narrow range many traits contribute. Homeotherms tend to be larger at higher latitudes (colder) Elephants are not a tropical phenomenon not really an exception to. Berg(cid:373)a(cid:374)(cid:374)(cid:859)s rule: the woolly ma(cid:373)(cid:373)oth has lo(cid:374)g, shaggy fur a(cid:374)d it(cid:859)s (cid:448)ery (cid:271)ig. Shape matters: variatio(cid:374)s i(cid:374) shape (cid:449)ill produ(cid:272)e differe(cid:374)t sa (cid:894)a(cid:374)d he(cid:374)(cid:272)e, sa : v(cid:895) e(cid:448)e(cid:374) if you(cid:859)re holdi(cid:374)g volume constant, sphere has least sa : v, a thin sheet of paper has the greatest sa : v. Bio120h1(f) lecture 15: sometimes, sa is needed for function, particular shapes are needed for function, tradeoffs and adaptive compromises.