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The distribution, abundance and seasonality of pelagic marine invertebrate larvae in the maritime Antarctic

Stanwell-Smith, Damon; Peck, Lloyd S.; Clarke, Andrew; Murray, Alistair W. A.; Todd, Christopher D.. 1999 The distribution, abundance and seasonality of pelagic marine invertebrate larvae in the maritime Antarctic. Philosophical Transactions of the Royal Society B: Biological Sciences, 354 (1382). 471-484. 10.1098/rstb.1999.0398

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Abstract/Summary

A survey of pelagic larvae was undertaken between November 1992 and February 1995 at Signy Island, Antarctica (60° 43′ S, 45° 36′ W). A diver–towed net and hand–held plankton pump were used at five sites of varying depths (6–30 m) and benthic substrata, in a combination of monthly and fortnightly samples. Overall larval ecological diversity was much higher than expected, with 131 morphologically distinct larval forms collected, apparently representing most of the benthic phyla present. The species richness observed is comparable with levels recorded at temperate latitudes, and higher than Arctic data and the implications for Thorson's rule (the inferred cline of reduced pelagic larval diversity towards high latitudes) is discussed. Larval abundances were low (mean 2.6 individuals per m3) which were two to six orders of magnitude lower than peaks in comparable data from temperate and tropical zones. We suggest that the low abundances recorded are a reflection of both slow developmental rates and a high dilution of larvae, reducing synchrony and spreading larvae over larger distances. Three seasonal periods, during which different larval types occur, have been identified. Summer, late summer and winter spawning strategies were discernable, and in some groups larvae occurred throughout the year.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1098/rstb.1999.0398
Programmes: BAS Programmes > Pre 2000 programme
ISSN: 0962-8436
Additional Keywords: larva, Antarctic, diversity, abundance, seasonality, marine invertebrate
NORA Subject Terms: Marine Sciences
Date made live: 12 Nov 2013 12:03 +0 (UTC)
URI: http://nora.nerc.ac.uk/id/eprint/503794

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