tailieunhanh - Behavioral and endocrine correlates of reproductive failure in social aggregations of captive wolverines (Gulo gulo)

Variation in the morphology of the adult male reproductive system among different groups of Hymenoptera offer characteristics that help studies of behavior and the evolutionary history of this group. The objective of this study was to describe the adult male reproductive system of the wasp Polistes versicolor versicolor Olivier (Vespidae: Polistini). The reproductive systems were dissected, fixed and embedded for light microscopy. In P. v. versicolor, the reproductive system includes a pair of testes, each one with three fusiform follicles. From each follicle emerges an efferent duct that later join together, forming a deferent duct. The first half of. | Journalof Zoology. Print ISSN 0952-8369 Behavioral and endocrine correlates of reproductive failure in social aggregations of captive wolverines Gulo gulo F. Dalerum1 S. Creel2 S. B. Hall3 1 Department of Zoology Stockholm University Sweden 2 Department of Ecology Montana State University Bozeman MT USA 3 Division of Recovery Endangered Species Division US Fish and Wildlife Service Portland OR USA Keywords social stress reproductive success sociobiology carnivore endocrinology. Correspondence Fredrik Dalerum Department of Zoology Stockholm University SE-106 91 Stockholm Sweden. Tel 46-8-16-40 01 Fax 46-8-16-77-15 Email Received 19 April 2005 accepted 1 November 2005 doi Abstract Sociality in mammals is often viewed as a dichotomy with sociality contrasted against solitariness. However variation within these broad categories may have strong effects on individual fitness. For example reproductive suppression of social subordinates is generally associated with group living but suppression may also occur in solitary species if the behavioral and physiological processes involved can be modulated by the demographic environment. To investigate whether behavioral and physiological traits that normally are associated with group living might be latent even in a solitary species we explored the level of sociality and investigated causes and mechanisms of reproductive failure in female wolverines Gulo gulo that experienced a highly aggregated social environment in captivity. Behaviorally females showed low levels of aggression and intermediate levels of social interactions. Reproductive failure seemed to have been related to low social rank and to have occurred between ovulation and implantation in 13 out of 15 breeding attempts. However three of eight females observed to mate produced offspring indicating that no individual female fully managed to monopolize breeding. Reproductive failure was not related to .

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