Lookup NU author(s): Peter Elbourne,
Professor Tony Clare
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Gregariousness in marine invertebrate larvae is an important regulator of benthic community structure. Previous laboratory settlement assays employing Balanus amphitrite Darwin cyprids found gregarious effects with as few as 3 larvae well(-1), together with modulation of such effects by chemical cues. Here, the relationship between settlement rate and larval density was rigorously tested through a fully randomised design. Seawater conditioned with adult B.amphitrite was tested alongside unconditioned seawater to determine the effect of a conspecific cue on gregarious interactions. Gregarious effects were detected in both conditioned and unconditioned seawater at <= 4 larvae well(-1). In untreated seawater, settlement rate increased linearly with larval density, levelling off at densities of >= 10 larvae well(-1). In conditioned seawater, settlement induction was observed at <= 4 larvae well(-1), switching to inhibition at 6, 8 and 10 larvae well(-1), before asymptoting at the highest densities tested. These results advocate the use of individual larvae in laboratory assays that investigate factors stimulating barnacle settlement.
Author(s): Elbourne PD, Veater RA, Clare AS
Publication type: Article
Publication status: Published
ISSN (print): 0892-7014
ISSN (electronic): 1026-7867
Publisher: Taylor & Francis Ltd.
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