Back to Search
Start Over
Macrofauna under sea ice and in the open surface layer of the Lazarev Sea, Southern Ocean
- Source :
- Deep-Sea Research. Part II, tropical studies in oceanography, 58(19-20), 1948-1961, Deep-Sea Research. Part II, tropical studies in oceanography 58 (2011) 19-20, Deep-Sea research part ii-Topical studies in oceanography, 58(19-20), 1948-1961. PERGAMON-ELSEVIER SCIENCE LTD
- Publication Year :
- 2011
- Publisher :
- Elsevier BV, 2011.
-
Abstract
- A new fishing gear was used to sample the macrozooplankton and micronekton community in the surface layer (0-2 m) under ice and in open water, the Surface and Under Ice Trawl (SUIT). In total, 57 quantitative hauls were conducted in the Lazarev Sea (Southern Ocean) during 3 different seasons (autumn 2004, winter 2006, summer 2007/2008). At least 46 species from eight phyla were caught in all 3 seasons combined. Biomass density was dominated by Antarctic krill Euphausia superba. The average biomass density was highest under the winter sea ice and lowest under the young ice in autumn. In summer, macrozooplankton biomass was dominated by ctenophores in open water and by Antarctic krill under ice. The community composition varied significantly among seasons, and according to the presence of sea ice. The response of the community composition to the presence of sea ice was influenced by species that were significantly more abundant in open water than under ice (Cyllopus lucasii, Hyperiella dilatata), only seasonally abundant under ice (Clione antarctica), or significantly associated with sea ice (Eusirus laticarpus). A number of abundant species showed distinct diel patterns in the surface occurrence both under ice and in open water, indicating that the surface layer serves as a foraging ground predominantly at night. Our results emphasize the potential of a number of non-euphausiid macrozooplankton and micronekton species to act as energy transmitters between the production of sea ice biota and the pelagic food web. By providing a regional-scale quantitative record of macrofauna under Antarctic sea ice covering 3 seasons, this study adds new and direct evidence that the ice-water interface layer is a major functional node in the ecosystem of the Antarctic seasonal sea ice zone. (C) 2011 Elsevier Ltd. All rights reserved.
- Subjects :
- krill euphausia-superba
Euphausia
Sea ice
vertical-distribution
callianira-antarctica
Antarctic sea ice
Limacina helicina
Oceanography
Zooplankton
Antarctic zone
Ecosystemen
Community composition
zooplankton community
antarctic krill
60 degrees S 6 degrees W/70 degrees S 3 degrees E
Sympagic fauna
geography
geography.geographical_feature_category
biology
Food webs
Pelagic zone
biology.organism_classification
Arctic ice pack
limacina-helicina
Antarctic krill
western weddell sea
sagitta-gazellae
Environmental science
pack-ice
community structure
Clione antarctica
Subjects
Details
- ISSN :
- 09670645
- Volume :
- 58
- Database :
- OpenAIRE
- Journal :
- Deep Sea Research Part II: Topical Studies in Oceanography
- Accession number :
- edsair.doi.dedup.....34df0149a4bfef59b606435433e243d5