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Reproduction and growth of Alcyonidium hirsutum (Fleming) and Flustrellidra hispida (Fabricius) (Bryozoa: Ctenostomata) within a Fucus serratus L. community Wood, V.; Seed, R. (1992). Reproduction and growth of Alcyonidium hirsutum (Fleming) and Flustrellidra hispida (Fabricius) (Bryozoa: Ctenostomata) within a Fucus serratus L. community. Cah. Biol. Mar. 33(3): 347-363 In: Cahiers de Biologie Marine. Station Biologique de Roscoff: Paris. ISSN 0007-9723; e-ISSN 2262-3094

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Beschikbaar in	Auteurs
VLIZ: Open access 286933 [ download pdf ]

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Trefwoord

Marien/Kust

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Auteurs		Top
Wood, V. Seed, R.

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Abstract

The reproductive and growth cycles of two common ctenostome bryozoans within a Fucus serratus L. community in the Menai Strait, North Wales, are described. Alcyonidium hirsutum (Fleming), started to develop embryo sacs in September and larval release occurred between October and January. In Flustrellidra hispida (Fabricius), embryo sacs appeared in February or March and larval release occurred between May and November. Fecundity in both bryozoans was linearly related to colony area. Few colonies of either species survived to breed in their second year. After settling in October, A. hirsutum grew very slowly throughout winter; between April and July, growth was exponential, but slowed thereafter. Growth in F. hispida started immediately after settlement in July and continued until September; little or no increase in colony size occurred over winter, but between April and July growth proceeded rapidly. Colony size in both bryozoans was reduced at high population density but no significant size differences occurred amongst colonies attached to the concave or convex surfaces of F. serratus. Populations of both species were always heavily skewed towards small colonies.

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