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Mar Pollut Bull. 2018 Mar;128:483-495. doi: 10.1016/j.marpolbul.2018.01.063. Epub 2018 Feb 6.

Temporal changes in benthic macrofauna on the west coast of Norway resulting from human activities.

Author information

1
Uni Research Environment, SAM-Marine, 5006 Bergen, Norway. Electronic address: per-otto.johansen@uni.no.
2
Uni Research Environment, SAM-Marine, 5006 Bergen, Norway.
3
Uni Research Environment, SAM-Marine, 5006 Bergen, Norway; Department of Marine Sciences, University of Gothenburg, 40530 Gothenburg, Sweden.
4
Fishguard Miljø, avd. Bergen, 5006 Bergen, Norway.
5
Universitat Pompeu Fabra, 08005 Barcelona, Spain.
6
Uni Research Environment, SAM-Marine, 5006 Bergen, Norway; Department of Biology, KG Jebsen Centre for Deep Sea Research, University of Bergen, 5006 Bergen, Norway.

Abstract

Quantitative analyses of soft bottom invertebrate fauna from four Norwegian sill fjords show increased macrofaunal abundance, species richness, and a considerably changed benthic deep water macrofaunal composition in the inner parts of the fjord system. In retrospect, the analyses show significantly altered benthic macrofaunal community structure that was not reflected by the changes in the Shannon-Wiener diversity indices during regular monitoring. The observed changes are mainly due to an increased abundance of opportunistic species, especially of the polychaete Polydora sp. during the last 10-15 years which is correlated significantly to declining dissolved oxygen, rising temperature in the bottom water and increasing total organic matter in the sediment. Possible anthropogenic and climatic impact factors related to the observed macrofaunal changes and environmental consequences of the changes are discussed.

KEYWORDS:

Aquaculture; Community structure; Eutrophication; Invasive species; Long-term changes; Organic enrichment

PMID:
29571400
DOI:
10.1016/j.marpolbul.2018.01.063
[Indexed for MEDLINE]

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