Abstract
Reproductive behavior of the herbivorous damselfishStegastes nigricans was studied. Both males and females held individual feeding territories, which were distributed contiguously and formed colonies. Spawning season was from June to September. Females visited males' territories and spawned eggs on the algal nest. Males tended eggs until hatching but exhibited less care taking behavior than other damselfishes. The mating system was promiscuous in that both males and females spawn with several mates, even within a single day. However, only 1 female was accepted in the nest at a time. The restriction of the number of mates in the nest may be an adptation to prevent the sneaking which was often conducted by other males of the same colony, and may also be avoidance of disturbing the spawning female. Most spawnings were done among members of the same colony and inter-colonial spawnings were rare (27 cases of 333 spawnings observed). The results of this study suggest that colonial distribution ofS. nigricans may bring several benefits in reproduction to the colony members (e.g. easy mate findings within fellow colony members), but also seems to bring costs (e.g. restriction of number of mates).
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Karino, K., Nakazono, A. Reproductive behavior of the territorial herbivoreStegastes nigricans (Pisces: Pomacentridae) in relation to colony formation. J. Ethol. 11, 99–110 (1993). https://doi.org/10.1007/BF02350043
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DOI: https://doi.org/10.1007/BF02350043