Deep-sea meiobenthos of the central Arctic Ocean: Distribution patterns and size-structure under extreme oligotrophic conditions


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ischewe [ at ] awi-bremerhaven.de

Abstract

During the expedition 'Arctic Ocean '96' with the Swedish icebreaker ODEN (18.07.-21.09.96), sediments were collected from 20 basin and ridge stations in the deep-sea regions of the central Arctic Ocean north of 85°N at water-depths between 864 m and 4187 m to investigate the influence of extreme food scarceness in the perennially ice covered deep Arctic-Mediterranean on the meiobenthic community. Meiofauna densities (including foraminiferans) ranged between 68-247 ind·10 cm-2 in the uppermost sediment layers and were very low compared to values from temperate, central oceanic regions. Nevertheless, a decrease in abundance with increasing water depth as well as regional differences in abundance and community structure were detectable. Foraminiferans were by far the predominant taxon (58-86 %), followed by nematodes (10-27 %). Except for harpacticoid copepods all other meiofauna taxa occurred in extremely low densities and very patchy. Very low meiofaunal abundances and a visible trend towards miniaturisation of organisms may be an outcome of the extremely limited food supply to the benthos under perennial ice-coverage of the central Arctic Ocean.



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Eprint ID
2768
Cite as
Schewe, I. and Soltwedel, T. (1999): Deep-sea meiobenthos of the central Arctic Ocean: Distribution patterns and size-structure under extreme oligotrophic conditions , Vie et Milieu, 49 (2-3), pp. 79-92 .


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