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

Andrew Stuart Brierley

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)109-114
Number of pages6
JournalPolar Biology
Volume22
Issue number2
DOIs
Publication statusPublished - Aug 1999

Keywords

  • PRYDZ BAY-REGION
  • SOUTH GEORGIA
  • SUPERBA DANA
  • DECEPTION-ISLAND
  • KRILL
  • SWARMS
  • SIZE
  • SEABIRDS
  • POPULATIONS
  • VARIABILITY

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