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Defenses and refuges: alternative mechanisms of coexistence between a predatory gastropod and its ascidian prey

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Abstract

Only five of the 14 species of solitary ascidians in the San Juan Islands, Washington, USA commonly co-occur with an abundant predator of the rocky subtidal, the gastropod Fusitriton oregonensis. None of the common subtidal species is defended by vanadium or sulfuric acid; concentrations of these substances are highest in species that are eaten readily by F. oregonensis and are uncommon in the rocky subtidal. Experimental manipulations indicate that Halocynthia igaboja are protected by stiff spines of the tunic. The defense mechanism of Pyura haustor consists of a tough, leathery tunic with inorganic inclusions, and microscopic spines around the siphons. Boltenia villosa and Styela gibbsii are eaten by snails in the laboratory, but live in areas where the predator is abundant. Both find refuge as epizooites on P. haustor and H. igaboja. The mechanisms by which Cnemidocarpa finmarkiensis persists in the presence of F. oregonensis is unknown.

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Authors and Affiliations

  1. Department of Biological Science, Florida State University, 32306, Tallahassee, Florida, USA

    C. M. Young

  2. Department of Zoology, University of Alberta, T6G 2E9, Edmonton, Alberta, Canada

    C. M. Young

  3. Harbor Branch Foundation, RR 1 Box 196, 33450, Fort Pierce, Florida, USA

    C. M. Young

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Communicated by J. M. Lawrence, Tampa

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Young, C.M. Defenses and refuges: alternative mechanisms of coexistence between a predatory gastropod and its ascidian prey. Marine Biology 91, 513–522 (1986). https://doi.org/10.1007/BF00392603

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