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Pupillary Mobility in Four Species of Marsupials with Differing Lifestyles by Catherine Arrese is a Environmental Science article available to read on EtoBox.

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## Abstract The pupillary response to the onset of bright light (10 000 lx) and darkness (4 lx) is compared in four species of Australian marsupials with different activity patterns. Maximal and minimal pupil width in relation to eye width was measured and the rate of change assessed. In the arrhythmic fat‐tailed dunnart __Sminthopsis crassicaudata__, there were marked changes in pupil size with the range of pupil width to eye width of 0.73–0.10; constriction was rapid (54% s^−1^) and dilatation slower at 10% s^−1^. The crepuscular honey possum __Tarsipes rostratus__ had a small range of pupil size at 0.56–0.46, with constriction and dilatation being slow at 4% s^−1^ and 3% s^−1^, respectively. The strictly nocturnal burrowing bettong __Bettongia lesueur__ had a small pupil with a limited size range of 0.21–0.12; constriction at 25% s^−1^ outstripped dilatation at 7% s^−1^. The greater bilby __Macrotis lagotis__, also strictly nocturnal, had a small and immobile pupil with a fixed pupil width to eye width ratio of 0.08. In conclusion, contrary to most previous assumptions, pupil size is not fixed in marsupials, and not all nocturnal animals possess a wide pupil. Moreover, as a regu

Who reads Pupillary Mobility in Four Species of Marsupials with Differing Lifestyles?

Author

Catherine Arrese

Publisher

John Wiley and Sons; Wiley (Blackwell Publishing); Wiley-Blackwell; Wiley (ISSN 0952-8369)

Published

2006

Language

EN

Field

Environmental Science (Physical Sciences)