Titre du document / Document title
Effects of trawling on seafloor habitat and associated invertebrate taxa in the Gulf of Alaska
Auteur(s) / Author(s)
FREESE L. (1) ;
AUSTER P. J. (2) ;
HEIFETZ J. (1) ;
WING B. L. (1) ;
Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)
(1) Auke Bay Laboratory, Alaska Fisheries Science Center, National Marine Fisheries Service, 11305 Glacier Highway, Juneau, Alaska 99801-8626, ETATS-UNIS
(2) National Undersea Research Center for the North Atlantic & Great Lakes, University of Connecticut at Avery Point, Groton, Connecticut 06340, ETATS-UNIS
Résumé / Abstract
Short-term effects of bottom trawling on a 'hard-bottom' (pebble, cobble, and boulder) seafloor were studied on the outer continental shelf in the eastern Gulf of Alaska. Eight sites were trawled in August 1996; then, from a research submersible we videotaped each trawl path and a nearby reference transect to obtain quantitative data. Boulders were displaced, and large epifaunal invertebrates were removed or damaged by a single trawl pass. These structural components of habitat were the dominant features on the seafloor. There was a significant decrease in density, and an increase in damage, to sponges and anthozoans in trawled versus reference transects. Changes in density, or damage to most motile invertebrates were not detected. Delayed mortality, of apparently undamaged invertebrates, may have resulted in greater impact than we detected. Alternatively, over time, some invertebrates may have recovered from any damage previously suffered. A subsequent survey at these sites will address these questions.
Revue / Journal Title
Marine ecology. Progress series
ISSN
0171-8630
Source / Source
1999, vol. 182, pp. 119-126 (33 ref.)
Langue / Language
Anglais
Editeur / Publisher
Inter-Research, Oldendorf, ALLEMAGNE
(1979)
(Revue)
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Localisation / Location
INIST-CNRS, Cote INIST : 18208, 35400008532492.0100
Nº notice refdoc (ud4) : 1886068
