Kartlegging av fremmede marine arter i Rogaland

Abstract

The method Rapid Coastal Survey was applied in 36 marinas in the county of Rogaland during five days in august 2010. 27 introduced species were targeted in this investigation. No new species to Norway was found, but six species already established in Norway were observed at a number of sites. The ascidian Styela clava, native to northwest Pacific, was recorded at eleven sites in the county, and was most abundant at sites near Stavanger, where the species was recorded for the first time in 1990. The Japanese wire weed Sargassum muticum was recorded on 26 of 36 sites, and was quite abundant on many of them. The method is well suited for mapping of sessile organisms in shallow waters, but is less applicable for recordings of mobile animals such as crustaceans.