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Marine Biology

, Volume 69, Issue 3, pp 331–343 | Cite as

Efficacité et sélectivité faunistique comparée de quatre appareils de prélèvements endo-, épi- et suprabenthiques sur deux types de fonds

  • L. Huberdeau
  • P. Brunel
Article

Abstract

Using data from 6 cruises from May to October 1972, we have compared the efficiency and selectivity of a double-scoop Holme bottom sampler, a “Spatangue” anchor dredge, a Hessler-Sanders epibenthic sled and a Macer-GIROQ suprabenthic sled, at comparable time intervals, on muddy sand at a depth of 18 to 26 m and on silty clay at 329 to 355 m in the Lower St. Lawrence Estuary, Quebec, Canada. Estimates of density and species proportions of most taxa except polychaetes allow an assessment of the stratification of autecological forms at the bottom-water interface. Estimates of species percentages are similar for the Holme sampler and the dredge, but only the former yields reliable density estimates. The dredge underdigs and overestimates density on harder ground, and overdigs and underestimates it on soft mud. Both types of estimates are comparable among suprabenthic samples not contaminated with mud, and the fauna therein (Crustacea account for 97% of individuals and 79% of species, excluding copepods) at both stations is markedly different from that of other sample types. Epibenthic and contaminated suprabenthic samples yield estimates somewhat transitional between those of endobenthic and non-contaminated suprabenthic samples. The Hessler-Sanders sled behaves somewhat like a dredge, depending on substrate firmness, and many mobile Crustacea can apparently evade it. No instrument adequately samples the 28 cm layer closest to the bottom.

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Copyright information

© Springer-Verlag 1982

Authors and Affiliations

  • L. Huberdeau
    • 1
  • P. Brunel
    • 1
  1. 1.Département de Sciences biologiquesUniversité de MontréalMontréalCanada

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