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Avian predation on wild and cultured sea urchin Strongylocentrotus intermedius in a rocky shore habitat

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Abstract

The present study reports the annual variation in consumption of the sea urchin Strongylocentrotus intermedius by avian predators on a rocky shore where the culture of sea urchins has been conducted. Carrion crow and a few gull species were the most abundant avian predators and consumed a large number of sea urchins. Crows consumed mostly natural sea urchins, approximately 36 kg ww/ha per year on the intertidal rocky bench, but the gull species consumed mostly cultured sea urchins, approximately 100 kg ww/ha per year in the culture area. The seasonal variation in the amount of sea urchins consume by crows was higher than that by the gull species, presumably because of the difference in foraging behavior in association with the seasonal tidal cycle. The natural sea urchins consumed are an allochthonous input from the subtidal to the intertidal habitat, and thus, crow predation may not affect the natural and the cultured populations of the sea urchin. The gull species consumed much of the cultured sea urchin, and thus, may be regarded as an effective predator causing damage to sea urchin culture. The results suggest that further studies are needed to determine why the gull species selectively feed on cultured sea urchins.

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Correspondence to Masakazu Hori.

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Hori, M., Noda, T. Avian predation on wild and cultured sea urchin Strongylocentrotus intermedius in a rocky shore habitat. Fish Sci 73, 303–313 (2007). https://doi.org/10.1111/j.1444-2906.2007.01336.x

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  • DOI: https://doi.org/10.1111/j.1444-2906.2007.01336.x

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