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IguanasBiology and Conservation$
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Allison Alberts

Print publication date: 2004

Print ISBN-13: 9780520238541

Published to California Scholarship Online: March 2012

DOI: 10.1525/california/9780520238541.001.0001

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PRINTED FROM CALIFORNIA SCHOLARSHIP ONLINE (www.california.universitypressscholarship.com). (c) Copyright University of California Press, 2021. All Rights Reserved. An individual user may print out a PDF of a single chapter of a monograph in CALSO for personal use.date: 31 July 2021

Environmental Scaling of Body Size in Island Populations of Galápagos Marine Iguanas

Environmental Scaling of Body Size in Island Populations of Galápagos Marine Iguanas

Chapter:
(p.148) 11 Environmental Scaling of Body Size in Island Populations of Galápagos Marine Iguanas
Source:
Iguanas
Author(s):

Martin Wikelski

Chris Carbone

Publisher:
University of California Press
DOI:10.1525/california/9780520238541.003.0013

This chapter examines the environmental determinants of body size in Galápagos marine iguanas. It presents a mechanistic model to describe the feeding performance of male iguanas in Santa Fé and Genovesa and three other island populations. It examines the variations in average temperatures and algae pasture height to predict maximum body mass. Three predictions can be drawn from the analysis: small animals can survive over a larger range of environmental conditions than large animals; algae pasture height is the only model parameter that affected maximum permissible body size in marine iguanas; and the digestion of large iguanas is much more constrained than that of small iguanas.

Keywords:   body size, marine iguanas, feeding performance, body mass, algae pasture height

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