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Reproductive and foraging energetics of pinnipeds: Implications for life history patterns

  • Chapter
The Behaviour of Pinnipeds

Abstract

In his classic treatise on the evolution of pinniped breeding systems, Bartholomew (1970) identified terrestrial parturition and marine feeding as prerequisites for the evolution of polygyny. Such spatial and/or temporal separation of feeding from reproduction is a fundamental component of the reproductive biology of all pinnipeds, regardless of their breeding system. Adaptation to this constraint has resulted in reproductive patterns that incorporate varying periods of time spent fasting on the rookery and feeding at sea (Bonner, 1984; Kovacs and Lavigne, 1986). This chapter will examine the partitioning of energy during lactation and its acquisition while foraging. In this way the fundamental relationship between the foraging ecology and reproductive pattern of pinnipeds can be examined. Information about feeding is difficult to acquire, and conclusions are often of necessity inferred from records from relatively new instruments like time/depth recorders. Previous to the development of this technology, our understanding of foraging was based on measures such as the animal’s partitioning of time on land and at sea, and simple indices of feeding such as stomach content and scat analyses. Because of these constraints, much of what follows is speculative and must sometimes be based on a small number of species.

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Costa, D.P. (1991). Reproductive and foraging energetics of pinnipeds: Implications for life history patterns. In: Renouf, D. (eds) The Behaviour of Pinnipeds. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-3100-1_6

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