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Foraging strategies associated with alternative reproductive tactics in a large mammal

Authors

  • L. Corlatti,

    Corresponding author
    1. Research Unit of Behavioural Ecology, Ethology and Wildlife Management, Department of Life Sciences, University of Siena, Siena, Italy
    2. Institute of Wildlife Biology and Game Management, University of Natural Resources and Life Sciences Vienna, Vienna, Austria
    • Correspondence

      Luca Corlatti, Institute of Wildlife Biology and Game Management, University of Natural Resources and Life Sciences Vienna, Gregor-Mendel Street 33, A-1180 Vienna, Austria. Email: luca.corlatti@boku.ac.at

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  • B. Bassano,

    1. Alpine Wildlife Research Center, Gran Paradiso National Park, Turin, Italy
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  • T. G. Valencak,

    1. Research Institute of Wildlife Ecology, University of Veterinary Medicine Vienna, Vienna, Austria
    2. Institute of Genetics and Developmental Biology, State Key Laboratory of Molecular Developmental Biology, Chinese Academy of Sciences, Beijing, China
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  • S. Lovari

    1. Research Unit of Behavioural Ecology, Ethology and Wildlife Management, Department of Life Sciences, University of Siena, Siena, Italy
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  • Editor: Nigel Bennett

Abstract

Foraging behaviour plays a key role in growth, survival and reproduction. Male ungulates in temperate environments show seasonal fluctuations in uptake and use of energy, with summer accumulation of reserves later used to sustain the costs of the mating season. To date, however, very little information is available on the foraging behaviour of individuals adopting alternative reproductive tactics. We investigated the year-round foraging strategies of nine territorial and 10 non-territorial male Alpine chamois Rupicapra rupicapra in the Gran Paradiso National Park (Italy), and discussed them in relation to space use and forage quality. Territorial males showed marked seasonal changes in foraging behaviour, with low values of time spent foraging in spring, followed by an increase in summer, a drop in November and a subsequent increase in winter. The foraging rates of non-territorial males, on the other hand, showed smaller variation, decreasing gradually from spring to autumn, and increasing in winter, but with no significant reduction during the November rut. Although in summer territorial males remained at lower elevations than non-territorial males, faecal crude protein did not show any significant difference between male types. The effort to establish and defend territories (in spring and in November, respectively) may constrain foraging in territorial males, forcing them to compensate by increasing their energy intake over summer. Different levels of vertical movements in the warm months did not affect forage quality, suggesting that territorial males may be selective in the choice of palatable plants. Our results show that different reproductive tactics imply different foraging strategies over the year, which do not seem to depend on forage quality. Different foraging strategies over summer may possibly lead to different body conditions at the beginning of the mating season, which, in turn, could influence individual capability to cope with the costs of mating.

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