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Improvements to a passive trap for quantifying barnacle larval supply to semi-exposed rocky shores

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Christopher David Todd, PJC Phelan, BE Weinmann, AR Gude, C Andrews, David Maxwell Paterson, Michael Edward Lonergan, G Miron

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Planktonic cyprid larvae of the intertidal barnacle, Semibalamus balanoides (L.) and the infralittoral/sublittoral Balanus crenatus Brug., are readily captured in small, chambered, passive traps deployed on rocky shores. Several structural developments of a previous trap design improved urea (killing solution) retention and capture of cyprids of both species. The design adopted for assessment of the larval supply/settlement relationship of the focal species, S. balanoides, included additional internal baffles and the replacement of the cylindrical trap opening with a coned aperture. Three sizes of cone aperture area were compared, with the intermediate size (1 cm(2)) being optimal for measuring larval supply over the full range of wave action oil local shores. Most daily catches included larvae that were recognizable as having been dead before they were trapped, and had recently passed through the guts of grazing limpets (Patella vulgata L.). One site showed that similar to 32% of trapped S. balanoides were so-called 'faecal' cyprids. An inabilitv to distinguish these in trap samples would lead to a significant over-estimation of larval supply. Preliminary data indicated that S. balanoides larval supply to the intertidal is enhanced by onshore winds (or perhaps increased wave turbulence), whereas B. crenatus supply was positively correlated with offshore winds (or decreased turbulence). A clear 'supply/settlement' relationship for S. balanoides at six sites along similar to 40 km of coastline was derived from 1cm(2) coned trap catches and daily counts of settlement on ceramic tiles. There were no instances of disproportionately high settlement in relation to larval supply, but at five sites there were days when settlement apparently failed. The identification and explanation of settlement success and failure is fundamental to understanding the importance of larval Supply in structuring marine benthic Populations and communities. (c) 2005 Elsevier B.V. All rights reserved.



Original languageEnglish
Pages (from-to)135-150
Number of pages16
JournalJournal of Experimental Marine Biology and Ecology
Issue number2
Publication statusPublished - 16 May 2006

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