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Behavioral Ecology Advance Access originally published online on November 29, 2006
Behavioral Ecology 2007 18(1):271-275; doi:10.1093/beheco/arl076
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© The Author 2006. Published by Oxford University Press on behalf of the International Society for Behavioral Ecology. All rights reserved. For permissions, please e-mail: journals.permissions@oxfordjournals.org

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Testes size in birds: quality versus quantity—assumptions, errors, and estimates

Sara Calhim and Tim R. Birkhead

Department of Animal and Plant Sciences, University of Sheffield, Sheffield S10 2TN, UK

Address correspondence to S. Calhim. E-mail: s.calhim@sheffield.ac.uk.

Received 31 January 2006; revised 23 June 2006; accepted 25 September 2006.

The first 150 words of the full text of this article appear below.


   INTRODUCTION
 
Across a wide range of both invertebrate and vertebrate taxa, relative larger testes are associated with female and/or male promiscuity (e.g., mammals: Short 1979Go; Harcourt et al. 1981Go; Harvey and Harcourt 1984; Kenagy and Trombulak 1986Go; Hosken 1997Go, 1998Go; but see Heske and Ostfield 1990Go; birds: Cartar 1985Go; Møller 1991Go; Birkhead and Møller 1992Go; Møller and Briskie 1995Go; reptiles: Olsson and Madsen 1998Go; amphibians: Jennions and Passmore 1993; Byrne et al. 2002Go; fish: Stockley et al. 1997Go; Balshine et al. 2001; butterflies: Gage 1994Go; Drosophila flies: Pitnick 1996Go; acanthocephalan worms: Poulin and Morand 2000Go). Two general hypotheses have been proposed to explain interspecific variation in testes size: 1) sperm competition (Parker 1970Go) and 2) sperm depletion (Short 1981Go). Available data suggest that sperm competition may be a more important selective force than . . . [Full Text of this Article]


   VARIATION IN ESTIMATES
 
Intrinsic assumptions
Estimating "peak" CTM and sources of data

   DATA SET SIZE VERSUS DATA SET QUALITY
 

   ALLOMETRIC RELATIONSHIPS
 

   CONCLUSION
 

   SUPPLEMENTARY MATERIAL
 

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