Natural endocrine profiles of the group‐living skunk anemonefish Amphiprion akallopisos in relation to their size‐based dominance hierarchy

Natural endocrine profiles of the group‐living skunk anemonefish Amphiprion akallopisos in... Group‐living animals commonly display differences in behaviour, physiology and endocrine profiles between conspecifics within the group, which are tightly linked to reproduction. Teleosts exhibit a variety of social systems, where social status, as well as sex, has been linked to different androgen and oestrogen profiles. Levels of gonadal androgen and oestrogen were investigated as a function of sex and position in a social hierarchy in free‐living individuals of the skunk anemonefish Amphiprion akallopisos, a protandrous pomacentrid fish with a size‐based dominance hierarchical social system. Plasma levels of 11‐ketotestosterone (11‐KT), testosterone (T) and 17β‐oestradiol (E2), as well as conversion ratios from T, were measured by ELISA from 111 individuals along a linear hierarchy from 38 social groups in the wild. Blood plasma levels of 11‐KT and E2 showed sex differences, being higher in males and females respectively as expected based on their role as the major androgen and oestrogen in fish reproduction. However, no sex differences were found for T, which may represent its role in territorial defence or simply as a precursor for the synthesis of 11‐KT and E2. In terms of the hierarchical social system within males, 11‐KT levels decline as the hierarchy is descended, which may represent their decreasing reproductive opportunity, as well as the decreasing levels of aggression towards males lower in the hierarchy. In summary, the size‐based dominance hierarchy is associated with distinct steroid levels of 11‐KT and E2 between individual free‐living A. akallopisos that closely resemble those of species in which breeding individuals suppress reproduction of conspecifics lower in the hierarchy. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Fish Biology Wiley

Natural endocrine profiles of the group‐living skunk anemonefish Amphiprion akallopisos in relation to their size‐based dominance hierarchy

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Publisher
Wiley Subscription Services, Inc., A Wiley Company
Copyright
Journal of Fish Biology © 2018 The Fisheries Society of the British Isles
ISSN
0022-1112
eISSN
1095-8649
D.O.I.
10.1111/jfb.13559
Publisher site
See Article on Publisher Site

Abstract

Group‐living animals commonly display differences in behaviour, physiology and endocrine profiles between conspecifics within the group, which are tightly linked to reproduction. Teleosts exhibit a variety of social systems, where social status, as well as sex, has been linked to different androgen and oestrogen profiles. Levels of gonadal androgen and oestrogen were investigated as a function of sex and position in a social hierarchy in free‐living individuals of the skunk anemonefish Amphiprion akallopisos, a protandrous pomacentrid fish with a size‐based dominance hierarchical social system. Plasma levels of 11‐ketotestosterone (11‐KT), testosterone (T) and 17β‐oestradiol (E2), as well as conversion ratios from T, were measured by ELISA from 111 individuals along a linear hierarchy from 38 social groups in the wild. Blood plasma levels of 11‐KT and E2 showed sex differences, being higher in males and females respectively as expected based on their role as the major androgen and oestrogen in fish reproduction. However, no sex differences were found for T, which may represent its role in territorial defence or simply as a precursor for the synthesis of 11‐KT and E2. In terms of the hierarchical social system within males, 11‐KT levels decline as the hierarchy is descended, which may represent their decreasing reproductive opportunity, as well as the decreasing levels of aggression towards males lower in the hierarchy. In summary, the size‐based dominance hierarchy is associated with distinct steroid levels of 11‐KT and E2 between individual free‐living A. akallopisos that closely resemble those of species in which breeding individuals suppress reproduction of conspecifics lower in the hierarchy.

Journal

Journal of Fish BiologyWiley

Published: Jan 1, 2018

Keywords: ; ; ; ; ;

References

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