Gender contests in a simultaneous hermaphrodite snail: a size-advantage model for behavior
Article Abstract:
A study on the mating interactions between physid snails using Ghiselin's size-advantage model shows that body size affects gender expression. Successful mating involves smaller sperm donors and larger recipients. Attempts by larger snails to donate sperm are contested by the smaller snails. The smaller snail stands to gain through sperm donation as the larger snail is more fertile. In case of a conflict, the smaller snail escalates the conflict with shell swinging, which increases the risk of predation.
Publication Name: Animal Behaviour
Subject: Zoology and wildlife conservation
ISSN: 0003-3472
Year: 1996
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Mate choice and mate competition influence male body size in Japanese medaka
Article Abstract:
Large size provides an advantage in mating success among male Japanese medakas, Oryzias latipes, because females of this species consistently prefer larger males over smaller ones to mate with. This may be because smaller males become sperm-depleted sooner than larger males in repeated matings. O. latipes males and females have similar body sizes because of the reproductive advantages size confers, higher fecundity among females and mating success among males.
Publication Name: Animal Behaviour
Subject: Zoology and wildlife conservation
ISSN: 0003-3472
Year: 1998
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Differential effects of mate competition and mate choice on eastern tiger salamanders
Article Abstract:
Breeding trials with eastern tiger salamanders are aimed at determining the effect of dimorphic traits on reproductive success. Male tiger salamanders have larger bodies and longer, higher tails than females, which are thought to be influenced in their mate choice by such characteristics. The study shows that mate choice may be influenced by the males' longer tail lengths, while longer body lengths may be advantageous in mate competition.
Publication Name: Animal Behaviour
Subject: Zoology and wildlife conservation
ISSN: 0003-3472
Year: 1997
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