BIO 3302 Lecture Notes - Lecture 12: Elephant Seal, Rib Cage, Anaerobic Respiration
2 Dec 2016
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In water breathers, ventilation is linked to o2. Water is very oxygen poor (cid:894)it"s a pro(cid:271)le(cid:373) for (cid:449)ater (cid:271)reathers to e(cid:454)tra(cid:272)t o2) Water is also very variable in oxygen levels; for an animal that is reliant on o2 needs to be sensitive to water o2 levels and adjust accordingly. With high co2 levels you get into the range where it is important to monitor its levels so, living on a mountain or burrows will turn on periphery sensors of oxygen. Birds are hypoxia tolerant based on exercise; mammals are hypoxia tolerant based on reproduction. Divers: animals that are air breathers but spend a significant amount of time under water. Absence of ventilation - exercise on restricted o2 supplies. Temperature maintenance of high tb in an infinite heat sink. Reflect on opportunistic nature of natural selection (cid:894)ho(cid:449) (cid:272)a(cid:374) (cid:455)ou take (cid:449)hat"s there a(cid:374)d t(cid:449)eak it to increase dive time) Adapted divers exhibit blunted ventilator sensitivity to co2.
