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Lecture

Freeze Tolerance & Intolerance
Freeze Tolerance & Intolerance

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School
University of Guelph
Department
Biology
Course
BIOL 1070
Professor
Wright& Newmaster
Semester
Fall

Description
Monday, November 28th I CLICKER: Normally, body fluids of fish in temperate waters have a freezing point somewhere between -0.6 and -1.1ºC whereas seawater freezes at -1.9ºC. Why don’t Arctic fish freeze in water at a temperature of -1.5ºC? ANSWER: A.Due to the noncolligative properties of the body fluid Colligative: antifreezers lower freezing point of body fluids by increasing concentration of solutes. (ex. glycerol, propaline glycol) Noncolligative antifreezes lower the freezing point of body fluids because of specialized chemical properties. What strategies do Arc ectotherms use to survive Winter conditions? Strategies Freeze tolerance Freeze intolerance 1. behavioural avoidance X 2. production of antifreeze X X compounds 3. synthesis of ice X nucleating agents 4. supercooling (temperate X NOT arctic species) Heterotherms: Ob
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