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Corpus Systématique Animale

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Social organization and foraging in emballonurid bats

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Springer (journals)
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  • J. W. Bradbury 1
  • S. L. Vehrencamp 1
  • 1) Department of Biology, University of California at San Diego, C-016, 92093, La Jolla, California, USA

1. Four species of neotropical emballonurids were contrasted in their demographic profiles and their patterns of parental investment. Species using less seasonal habitats (Rhynchonycteris naso and Saccopteryx leptura) are those most likely to have more than one parturition per year, and parturition periods tend to be relatively asynchronous. Those species utilizing highly seasonal food supplies, Saccopteryx bilineata and Balantiopteryx plicata, show a single synchronous birth period annually. 2. In mammals, parental investment costs include not only such features as litter size (in all these species, one), but also the nature of the timing between parturition and food maxima. Where food peaks are synchronized with gestation, the survival of adults will be favored over that of lactating and dispersing offspring. Where food peaks coincide with lactation and dispersal, pregnant females suffer high risks during gestation. In our samples, the two species using seasonal habitats show synchrony between food peaks and lactation and dispersal, while those in stable habitats show synchrony between gestation and maximum food levels. 3. Young of both sexes are retained for long periods in S. leptura, a species of stable habitats. Male progeny of S. bilineata tend to settle near to parental units, while female offspring all disperse. In the other two species, both sexes disperse at weaning. 4. In S. bilineata, some females pregnant during the lean food season will either resorb or abort offspring. B. plicata females, which also suffer food stress during gestation, either disappear or complete their gestations. 5. The two stable habitat species, R. naso and S. leptura, both show a division of female colony members into reproductive and nonreproductive females. The latter are always young females that have never before reproduced. The age of first reproduction is thus later than one year in these species, while it is just one year in the other two species. 6. The four species may be ranked with regard to increasing levels of parental costs per parturition as follows: R. naso, S. leptura, S. bilineata, and B. plicata. This ranking is exactly the same as that obtained on the basis of adult female mortality rates or on the basis of habitat seasonality. We suggest that specialization in a particular foraging habitat has led, through differences in seasonality of food supplies, to the observed differences in parental investment patterns in our bat species.

Catégories Science-Metrix
  • 1 - health sciences
  • 2 - psychology & cognitive sciences
  • 3 - behavioral science & comparative psychology
Catégories INIST
  • 1 - sciences appliquees, technologies et medecines
  • 2 - sciences biologiques et medicales
  • 3 - sciences biologiques fondamentales et appliquees. psychologie
  • 4 - ethologie animale
Catégories Scopus
  • 1 - Life Sciences ; 2 - Agricultural and Biological Sciences ; 3 - Animal Science and Zoology
  • 1 - Life Sciences ; 2 - Agricultural and Biological Sciences ; 3 - Ecology, Evolution, Behavior and Systematics
Catégories WoS
  • 1 - science ; 2 - zoology
  • 1 - science ; 2 - ecology
  • 1 - science ; 2 - behavioral sciences
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Behavioral Ecology and Sociobiology

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  • Mammiferes
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