A comparison of Antarctic euphausiids sampled by net and from geothermally-heated waters:insights into sampling bias
The Antarctic euphausiids Euphausia superba and E. crystallorophias were sampled using aln 8 m(2) 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 whe...
| Published in: | Polar Biology |
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| Main Author: | |
| Format: | Article in Journal/Newspaper |
| Language: | English |
| Published: |
1999
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| Online Access: | https://risweb.st-andrews.ac.uk/portal/en/researchoutput/a-comparison-of-antarctic-euphausiids-sampled-by-net-and-from-geothermallyheated-waters(09f53241-246f-4fc5-bf7d-e3cc14744704).html https://doi.org/10.1007/s003000050397 http://www.scopus.com/inward/record.url?scp=0032771182&partnerID=8YFLogxK |
| Summary: | The Antarctic euphausiids Euphausia superba and E. crystallorophias were sampled using aln 8 m(2) 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. super ba samples. Possible explanations for these differences are discussed. |
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