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An experimental removal of a territorial pomacentrid: effects on the occurrence and behavior of competitors

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Stegastes fasciolatus is the most common territorial damselfish in the shallow waters of Hawaii. Territorial defense was observed against other herbivorous fishes, especially acanthorids, scarids and one omnivorous chaetodontid. One acanthurid,Acanthurus nigrofuscus was found to differ in abundance and social behavior in areas whereS. fasciolatus was present, compared to areas where it was absent. The chaetodontid,Chaetodon quadrimaculatus was sheltered during the day in areas where the pomacentrid was abundant, apparently feeding at night. In other areas it fed during the day and at night, depending on the phase of the moon.S. fasciolatus were then experimentally removed from one study site, to test whether the differences in abundance and behavior of the other species were due to the presence of the damselfish. There was a significant increase in numbers of the surgeonfishAcanthurus nigrofuscus in the removal area, as well as changes in social behavior from schooling to defense of small territories. The butterflyfish,C. quadrimaculatus, was observed to forage during the day in the removal area. There were no significant changes in the control sites. The presence of the interspecifically territorial damselfish,S. fasciolatus, thus appears to be an important determinant of the behavior of these potential food competitors.

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  1. Department of Zoology, University of Hawaii, Honolulu, HI, 96822, USA

    Thomas F. Hourigan

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  1. Thomas F. Hourigan
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Hourigan, T.F. An experimental removal of a territorial pomacentrid: effects on the occurrence and behavior of competitors. Environ Biol Fish 15, 161–169 (1986). https://doi.org/10.1007/BF00002991

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  • DOI: https://doi.org/10.1007/BF00002991

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