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Natural rates of growth and longevity of Nautilus belauensis

Published online by Cambridge University Press:  08 April 2016

W. Bruce Saunders
W. Bruce Saunders*
Affiliation:
Department of Geology, Bryn Mawr College, Bryn Mawr, Pennsylvania 19010
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Abstract

Capture-mark-recapture of Nautilus belauensis in Palau shows that (a) immature animals added an average of 0.1 mm of shell per day at the ventral circumference (projected mean annual increment of 37 mm), but this rate decreases rapidly as maturity is approached; (b) rate of growth line secretion is irregular, ranging from 4 to 8 days per growth line in immature animals; (c) overall weight is an imprecise measure of size and growth in Nautilus due to fluctuations in crop content and chamber liquid; (d) this species is shown to live for at least 4 yr beyond maturity. Age estimates based on the highest growth rate obtained (0.12 mm/day = 43.8 mm/yr) range from 14.5 to 17 yr for seven animals recaptured 45–355 days after release. Combined, these data indicate that the life span of Nautilus may exceed 20 yr.

Type
Research Article
Information
Paleobiology , Volume 9 , Issue 3 , Summer 1983 , pp. 280 - 288
Copyright
Copyright © The Paleontological Society 

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References

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