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• W2036632360 abstract "MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout the JournalEditorsTheme Sections MEPS 275:1-10 (2004) - doi:10.3354/meps275001 Importance of bioturbators for biodiversity maintenance: indirect effects of fishing disturbance Stephen Widdicombe1,*, Melanie C. Austen1, Michael A. Kendall1, Frode Olsgard2,3, Morten T. Schaanning2, Sarah L. Dashfield1, Hazel R. Needham1 1Plymouth Marine Laboratory, Prospect Place, West Hoe, Plymouth PL1 3DH, UK 2Norwegian Institute for Water Research, PO Box 173, Kjelsaas, 0411 Oslo, Norway 3Section of Marine Biology and Limnology, Department of Biology, University of Oslo, PO Box 1064, Blindern, 0316 Oslo, Norway *Email: swi@pml.ac.uk ABSTRACT: The relative impact on macrofaunal diversity of 7 naturally co-occurring bioturbators has been examined in a benthic mesocosm experiment. The bioturbators chosen were selected because of their potential vulnerability to the disturbances associated with demersal trawling. The experiment was conducted at the Solbergstrand mesocosm (Norwegian Institute for Water Research) using subtidal sediment collected from Bjørnehodebukta, a small sheltered bay in the Oslofjord. For 3 of the bioturbating species (Brissopsis lyrifera, Aphrodita aculeata and Amphiura chiajei) a positive, linear relationship was demonstrated between bioturbator abundance and measures of species richness (number of species and Margalef species richness). It was suggested that the presence of these bioturbating species increased oxygen penetration into the sediment, leading to an enhancement in the ability of benthic systems to process organic material. This had a beneficial effect on the associated fauna in terms of maintaining levels of diversity. For Nephtys caeca, highest species diversity was seen in the low abundance treatments. Predation by N. caeca on small polychaetes is proposed as a possible explanation of the lower diversity in high-density treatments. It is concluded that B. lyrifera, A. aculeata, A. chiajei and N. caeca are functionally similar with respect to setting the diversity of the associated macrobenthic community and may therefore fulfill the same role within the benthic ecosystem. The presence of Calocaris macandreae, Nuculana minuta and Astarte sulcata had no detectable effect on diversity. Trawling has been shown to reduce the abundance of bioturbating species, and the current study demonstrates important implications of this loss on the maintenance of diversity. In addition, the interactions between bioturbation, diversity and organic enrichment highlight the need for management of anthropogenic impacts within the coastal environment in a holistic way rather than by isolation. KEY WORDS: Diversity · Macrofauna · Bioturbation · Trawling · Disturbance · Mesocosm · Eutrophication · Oslofjord Full text in pdf format NextExport citation RSS - Facebook - Tweet - linkedIn Cited by Published in MEPS Vol. 275. Online publication date: July 14, 2004 Print ISSN: 0171-8630; Online ISSN: 1616-1599 Copyright © 2004 Inter-Research." @default.
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• W2036632360 title "Importance of bioturbators for biodiversity maintenance: indirect effects of fishing disturbance" @default.
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