Midwater fishes collected in the vicinity of the Sub-Polar Front, Mid-North Atlantic Ocean, during ECOMAR pelagic sampling

Tracey T. Sutton*, Tom Bech Letessier, Birkir Bardarson

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)

Abstract

The ECOMAR project was a multidisciplinary process study conducted in the mid-North Atlantic, coincident hydrodynamically with the Sub-Polar Front (SPF; 48-54 degrees N) and topographically with Charlie-Gibbs Fracture Zone of the Mid-Atlantic Ridge, as part of the Census of Marine Life field project MAR-ECO. Midwater trawling was conducted during the 2007 and 2009 ECOMAR expeditions at 14 stations north and south of the SPF, day and night, in four discrete depth intervals from 0 to 1000 m. A total of 56 species of midwater fishes representing 44 genera and 18 families were collected, several of which are new records for the region and/or were not previously sampled during MAR-ECO sampling. An annotated species list with depth-of-capture data is provided. Three species of the genus Cyclothone (Cyclothone braueri, Cyclothone microdon and Cyclothone pallida) and the myctophid Benthosema glaciate combined to contribute similar to 88% of all specimens collected. This finding differs from results of previous net-based sampling in the same area, likely due to sampling scheme differences (diel sampling, upper 800 m concentration) and gear selectivity (mesh size, trawl speed). Quantitative data from ECOMAR midwater sampling and the previous 2004 G.O. Sars MAR-ECO expedition are compared. Despite differences in gear between the major MAR-ECO expeditions, abundance estimates of some dominant species were remarkably similar. Data showed that the SPF is an asymmetrical, taxon-specific biogeographic boundary for deep-pelagic fishes in the North Atlantic; the SPF is semi-permeable to some species in one direction, while a strong boundary for species in another direction. Deeper-living fish species did not appear as affected by the SPF as a boundary. (C) 2013 Elsevier Ltd. All rights reserved.

Original languageEnglish
Pages (from-to)292-300
Number of pages9
JournalDeep Sea Research Part II: Topical Studies in Oceanography
Volume98
DOIs
Publication statusPublished - 15 Dec 2013

Keywords

  • Mesopelagic zone
  • Vertical distribution
  • Biogeography
  • Mid-Ocean Ridges
  • North Atlantic Ocean
  • GIBBS FRACTURE-ZONE
  • ABUNDANCE PATTERNS
  • RMT 1&8
  • RIDGE
  • ASSEMBLAGE
  • TELEOSTEI
  • STOMIIDAE
  • TRAWLS
  • MEXICO
  • GULF

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