BIOL 1902 Lecture Notes - Lecture 5: Torpor, Ruffed Grouse, Beaver

• School: Carleton University
• Department: Biology
• Course: BIOL 1902
• Professor: Michael Runtz

Document Summary

Braken fern is loaded with moulting hormones . Chemical messengers = phyto hormones (cid:894)do(cid:374)"t (cid:449)orry a(cid:271)out lear(cid:374)i(cid:374)g the (cid:272)ertai(cid:374) syste(cid:373)s. Sub zero temps water turns to ice and most things have water within their systems (water expands) Endotherms: keeps body temperature internally through cellular metabolic activity. (warm blooded) Ectotherms: do(cid:374)"t produ(cid:272)e te(cid:373)p i(cid:374)ter(cid:374)ally (cid:271)ut rely o(cid:374) e(cid:374)(cid:448)iro(cid:374)(cid:373)e(cid:374)t around them. (cold blooded) Mammals underfur is next to body/guard hair outside grows longer and thicker to trap heat in the body. Traps air which is hot and keeps them more. Bro(cid:449)(cid:374) fat = i(cid:374)ter(cid:374)al for (cid:271)ur(cid:374)i(cid:374)g for (cid:449)ar(cid:373)th (cid:894)do(cid:374)"t (cid:374)eed to k(cid:374)o(cid:449) a(cid:271)out (cid:373)ito(cid:272)ho(cid:374)direa(cid:895) Birds grow bulkier feathers; outside layer =contour or body feathers. Color can provide warmth: wind chill takes away body heat, white traps more body heat and black expels it quicker. Snowy owl, artic fox (gloger"s rule) = animals that shed their dark hair for light in winter.