Distribution patterns of polychaete fauna in an Arctic fjord Hornsund, SpitsbergenReportar como inadecuado




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Polar Biology

, Volume 36, Issue 10, pp 1463–1472

First Online: 03 August 2013Received: 07 November 2012Revised: 20 June 2013Accepted: 28 June 2013

Abstract

Polychaetes are one of the most important groups of benthic organisms in marine ecosystems. They dominate on the Arctic shelf and play an important role in ecosystem functioning. This study focuses on the polychaete biodiversity and their distribution patterns in Hornsund, an open glacial fjord, in western Spitsbergen and provides important baseline data for future studies of temporal fluctuations in benthic fauna. The main aim of this study was to assess how the polychaete abundance, biomass, diversity, community structure, and function vary along the Hornsund fjord’s axis, in relation to the environmental factors. Eighty-eight polychaete taxa were identified; an average density was 457 ind. m ± 237.5 SD. Three assemblages were distinguished INNER, MIDDLE, and OUTER along the fjord axis, reflecting the intensity of glacial disturbance. A clear division between the highly disturbed inner part of the fjord Brepollen and the less impacted middle and outer parts was observed. Continuous gradients in abundance, biomass, and diversity were found with all those values diminishing toward the inner region of the fjord. The polychaete assemblages- indices were significantly correlated with bottom temperature, sediment characteristics grain size, and distance to the glacier longitude. No significant correlations were found with depth or total organic carbon content. Carnivore and motile surface deposit feeding polychaete species dominated in the areas close to the glaciers, while the OUTER community was dominated by carnivores and surface sessile and discretely motile species, and had more complex trophic structure, with multiple species representing different functional groups including carnivores, sessile, discretely motile, and motile surface deposit feeders and motile burrowers.

KeywordsPolychaeta Svalbard Fjords Diversity Patterns of distribution  Download fulltext PDF



Autor: Monika Kędra - Krzysztof Pabis - Sławomira Gromisz - Jan Marcin Węsławski

Fuente: https://link.springer.com/



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