Allen’s Rule (VCE SSCE Biology): Flashcards

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Allen's Rule
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Allen's rule

Animals in cold climates have shorter appendages than in warm

Role of shorter appendages in cold climates

Conserve body heat

Role of longer appendages in warm climates

Dissipate excess heat

Biological basis of Allen's rule

Surface area to volume ratio

% of body heat toucans dissipate through large beaks

60%

Atlantic vs Eastern Song Sparrow bill surface area diff.

17% more in Atlantic

Atlantic vs Eastern Song Sparrow heat dissipation diff.

33% more in Atlantic

Method in Greenberg et al. song sparrow study

Infrared thermal imaging

Extremities in animal anatomy

Body parts extending from main body mass

Arctic foxes vs desert foxes ear length

Arctic foxes have shorter ears

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