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Titre du Document
Specificity of cues inducing defensive spines in the bryozoan Membranipora membranacea
Auteur(s)
IYENGAR Erika V. ; HARVELL C. Drew
Résumé
Although theory pinpoints the reliability of cues as an important condition for the evolution of inducible defenses, the specificity of cues is poorly known in most systems. The bryozoan Membranipora membranacea produces long, energetically-costly spines in response to a trophically specialized nudibranch Doridella steinbergae, but the range of nudibranchs that trigger this response is unknown. We tested chemical cues from 14 nudibranch species from 4 suborders, the snail species Lacuna vincta, and an abiotic treatment (desiccation) for their ability to induce spines. Both corner spines (arising from the corners of the zoecium) and membranous spines (arising from the frontal membrane of the zooid) were observed. Of the nudibranch species tested, 57 % induced corner spines in at least 1 trial: 4 predators of M. membranacea (Onchidoris muricata, Polycera zosterae, Triopha catalinae, and D. steinbergae) and 4 non-predators (Coryphella sp., Archidoris odhneri, Cadlina luteomarginata, and Dirona albolineata). Although many nudibranchs occasionally triggered spines, the spine response was most reliably and fully developed in response to the bryozoan's primary predator, D. steinbergae. All other species that induced corner spines, except Coryphella sp., failed to induce spines in all trials. Membranous spines were sometimes produced in response to D. steinbergae, O. muricata, P. zosterae, A. odhneri, and Coryphella sp. The last 2 species are not known to prey on M. membranacea. Neit
Editeur
Inter-Research
Identifiant
ISSN : 0171-8630
Source
Marine ecology. Progress series (Halstenbek) A. 2002, vol. 225, pp. 205-218 [bibl. : 43 ref.]
Langue
Anglais
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