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Effects of high-relief structures on cold-temperate fish assemblages: a field experiment
Stockholm University, Faculty of Science, Department of Zoology.
Stockholm University, Faculty of Science, Department of Zoology.
Stockholm University, Faculty of Science, Department of Zoology.
2006 (English)In: Marine Biology Research, ISSN 1745-1000, Vol. 2, no 2, 136-147 p.Article in journal (Refereed) Published
Abstract [en]

High-relief structures may influence the abundance and diversity of reef-associated fish. We conducted a field experiment to investigate whether the presence of vertical structures (PVC pipes) affects fish communities on artificial reefs. The effect of the height of the structures (1 and 3 m) was also tested. Furthermore, the effects on fish of placing artificial reefs on otherwise featureless bottoms were quantified. Algal and macro-invertebrate colonization of the reefs was also recorded. The experiment was carried out on the west coast of Sweden over a period of 1 year. The vertical structures had a positive effect on fish abundance but not on diversity. The height of the structures did not, however, influence the fish communities. Natural as well as urban vertical structures on the seafloor could have a positive effect on local fish abundance. The positive effects of artificial reefs on total fish abundance and diversity were immediate. Of the 10 species recorded, two, the black goby Gobius niger and the goldsinny wrasse Ctenolabrus rupestris , dominated over the whole survey period. There were significant temporal differences in fish abundance, and diversity increased with time.

Place, publisher, year, edition, pages
2006. Vol. 2, no 2, 136-147 p.
URN: urn:nbn:se:su:diva-30887DOI: 10.1080/17451000600684359OAI: diva2:274684
Available from: 2009-10-30 Created: 2009-10-30 Last updated: 2009-11-06Bibliographically approved
In thesis
1. Aspects of offshore renewable energy and the alterations of marine habitats
Open this publication in new window or tab >>Aspects of offshore renewable energy and the alterations of marine habitats
2009 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Several Western European countries are planning for a massive offshore renewable energy (i.e. wind and wave energy) development (ORED) along the European Atlantic coast and in the Baltic Sea. Acknowledging the scale of ORED, there is an increasing interest in the opportunities offered by the fishery closures and the addition of artificial hard substrata. This is in tandem with uncertainties on positive and negative effects on benthic assemblages and specific species of this large-scale deployment of artificial reefs.

This thesis focuses on the artificial reef effects of ORED, dealing with benthic assemblages on and in the vicinity of wind- and wave power foundations. Field surveys within offshore wind- and wave farms as well as targeted field experiments were conducted. Results suggest that wind- and wave power foundations can positively affect local abundances and diversity of several species of fish and decapods. Reef profile up to 1 m above the seabed may enhance benthic fish numbers. Structural complexity in the form of single-entrance holes positively affected numbers of edible crab (Cancer pagurus), but no effect on fish was shown. Enhanced structural complexity may, moreover, adversely affect abundances of some species through an induced predation pressure. Micro-habitat use by fish and lobsters (Homarus gammarus) encountered was described, and preferences of the edible crab were shown.

Filtrating organisms (i.e. blue mussels Mytilus spp. and barnacles Balanus spp.) seem to be particularly favoured by the conditions on offshore energy installations. The material and orientation of the substrate influenced colonisation patterns of epibiota. Moreover, wind turbines may alter the habitat composition on adjacent seabeds.

ORED could induce local ecological changes and put areas and species of conservation interest at risk. If well planned and co-ordinated, on the other hand, ORED could even be beneficial to the subsurface marine environment in several aspects.

Place, publisher, year, edition, pages
Stockholm: Department of Zoology, Stockholm University, 2009. 56 p.
renewable energy, biodiversity, wave power, wind power, disturbance, fish, fouling organisms, artificial reefs
Research subject
Animal Ecology
urn:nbn:se:su:diva-31157 (URN)978-91-7155-970-8 (ISBN)
Public defence
2009-12-11, hörsal 11, hus F, Universitetsvägen 10 F, Stockholm, 10:00 (English)
Available from: 2009-11-19 Created: 2009-11-06 Last updated: 2014-10-28Bibliographically approved

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Wilhelmsson, DanYahya, SalehÖhman, Marcus
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