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10 - Seasonality and reproductive function

Published online by Cambridge University Press:  10 August 2009

By
Diane K. Brockman  and
Carel P. van Schaik
Edited by
Diane K. Brockman  and
Carel P. van Schaik
Diane K. Brockman
Affiliation:
Department of Sociology and Anthropology, University of North Carolina at Charlotte, Charlotte NC 28223 USA
Carel P. van Schaik
Affiliation:
Anthropologisches Institut University of Zurich, Winterhurerstrasse 190 CH-8057 Zurich, Switzerland
Diane K. Brockman
Affiliation:
University of North Carolina, Charlotte
Carel P. van Schaik
Affiliation:
Universität Zürich
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Summary

Introduction: types of seasonality

Primates, like other mammals, exhibit varying patterns of reproductive seasonality, spanning the continuum from sharply delineated seasonal periods of mating and births to absolute non-seasonality, where mating and births are distributed broadly throughout the year. Both more qualitative reviews (Lancaster & Lee 1965; Lindberg 1987; Whitten & Brockman 2001) and recent quantitative reviews (Di Bitetti & Janson 2000) (see also Chapter 11) show that seasonal birth distributions are the norm rather than the exception for primates, particularly for species residing at higher latitudes, where food resources undergo pronounced annual seasonal fluctuations (see Chapter 11). Seasonal variation in the frequency of births is also a fairly common phenomenon in human populations (see Chapter 13), although its adaptive significance may have been more pronounced in earlier hominins than in contemporary humans. However, while documentation of the temporal patterning of reproduction and its regulation in primates have advanced steadily over the past few decades, we are a long way from having the detailed interspecific comparisons needed to answer the ultimate question, “Why be seasonal, and if so, how?”

Answers to this question invariably center on how resources are used and are allocated in support of reproductive effort (Drent & Daan 1980; Stearns 1989, 1992) under differing environmental regimes. In seasonal environments, we expect that it is in a female's best interest to align the costliest portion of her reproductive cycle with seasonal food peaks, so that she can acquire the essential resources to compensate for peaks in energy expenditure, thereby enhancing her overall fitness (Sadleir 1969).

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Seasonality in Primates
Studies of Living and Extinct Human and Non-Human Primates
 , pp. 269 - 306
Publisher: Cambridge University Press
Print publication year: 2005

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