Mate choice and cannibalism in a natural population of a stream goby,Rhinogobius sp. |
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Authors: | Sayaka Ito Yasunobu Yanagisawa |
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Institution: | (1) Department of Biology and Earth Sciences, Ehime University, 2-5 Bunkyo-cho, 790-8577 Matsuyama, Japan |
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Abstract: | Breeding ecology of the stream goby,Rhinogobius sp. LD (Large Dark), was investigated under natural conditions. Males selectively courted females of similar size to lead
them to the nests, whereas females followed courting males preferentially when the relative male size was greater. Male-male
competition for a female was relatively infrequent and not severe. Developmental stages of eggs and egg numbers in one nest
indicated that males receive 1–3 clutches during one breeding cycle. Males guarding multiple clutches frequently ate some
of the eggs, but those guarding single clutches rarely did so. Gravid females in the nest also frequently cannibalized eggs
laid by a previous female, probably in order to extend the area available for egg deposition. Mate choice in this species
is discussed in relation to paternal ability, limitation of available spawning area and the female-biased sex ratio. |
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Keywords: | Mate choice filial cannibalism courtship goby Rhinogobius |
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