Sex-role reversal of a monogamous pipefish without higher potential reproductive rate in females.

Sex-role reversal of a monogamous pipefish without higher potential reproductive rate in females. Research Abstract Details 

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Sex-role reversal of a monogamous pipefish without higher potential reproductive rate in females. Abstract Text:

Atsushi Sogabe,Yasunobu Yanagisawa,

In monogamous animals, males are usually the predominant competitors for mates. However, a strictly monogamous pipefish Corythoichthys haematopterus exceptionally exhibits a reversed sex role. To understand why its sex role is reversed, we measured the adult sex ratio and the potential reproductive rate (PRR), two principal factors influencing the operational sex ratio (OSR), in a natural population of southern Japan. The adult sex ratio was biased towards females throughout the breeding season, but the PRR, which increased with water temperature, did not show sexual difference. We found that an alternative index of the OSR (Sf/Sm: sex ratio of 'time in') calculated from the monthly data was consistently biased towards females. The female-biased OSR associated with sex-role reversal has been reported in some polyandrous or promiscuous pipefish, but factors biasing the OSR differed between these pipefish and C. haematopterus. We concluded that the similar PRR between the sexes in C. haematopterus does not confer reproductive benefit of polygamous mating on either sex, resulting in strict monogamous mating, and its female-biased adult sex ratio promotes female-female competition for a mate, resulting in sex-role reversal.

Sex-role reversal of a monogamous pipefish without higher potential reproductive rate in females. Publishing Authors By Initials

A Sogabe,Y Yanagisawa,

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Sex-role reversal of a monogamous pipefish without higher potential reproductive rate in females. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: Proceedings. Biological sciences / The Royal Socie

VOLUME: 274

Page Numbers: 2959-63

Journal Abbreviation: Proc. Biol. Sci.

ISSN: 0962-8452

DAY: 7

MONTH: Dec

YEAR: 2007

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LANGUAGE: eng

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AFFILIATION: Center for Marine Environmental Studies, Ehime University, Matsuyama 790-8577, Japan. sogabe@mserv.sci.ehime-u.ac.jp

Country: England

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MEDLINETA: Proc Biol Sci

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