A comparison of Antarctic euphausiids sampled by net and from geothermally heated waters: insights into sampling bias

Brierley, Andrew S.. 1999 A comparison of Antarctic euphausiids sampled by net and from geothermally heated waters: insights into sampling bias. Polar Biology, 22 (2). 109-114. 10.1007/s003000050397

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Abstract/Summary

The Antarctic euphausiids Euphausia superba and E. crystallorophias were sampled using an 8 m2 rectangular midwater trawl inside the caldera of Deception Island. Specimens of the same species were collected on the same day from the strandline and sublittoral fringe within the caldera at a bay where these euphausiids had been incapacitated by high temperature geothermally heated waters. Differences between length frequency distributions of samples obtained by both methods were investigated once net-caught specimens had been subject to the simulated effects of geothermally heated waters. Differences between maturity stage/sex ratios for E. superba samples were also assessed. No significant differences between sizes of net-caught or beach-sampled E. crystallorophias were detected, but significant differences were found between both the sizes and sex/maturity stages for E. superba samples. Possible explanations for these differences are discussed.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	10.1007/s003000050397
Programmes:	BAS Programmes > Pre 2000 programme
ISSN:	0722-4060
Additional Keywords:	Antarctic krill, Euphausiids, Euphausia superba, Euphausia crystallorophias, Deception Island, geothermal
Date made live:	28 Aug 2013 11:36 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/503042

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