Kartlegging av fremmede marine arter i Hordaland
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2012-03Metadata
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Original version
Husa V, Heggøy E, Sjøtun K, Agnalt A-L, Johansen P-O, Glenner H, Hatlen K. Kartlegging av fremmede marine arter i Hordaland. Utredning for DN 2-2012. Direktoratet for naturforvaltning.Abstract
The method Rapid Coastal Survey was
applied in a pilot project in the county of
Hordaland in autumn 2010. The abundance
of 21 introduced target species was
investigated in 32 marinas in the area. 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 for the first time in the county
of Hordaland. This species is established
along the southern coast of Norway and in
the county of Rogaland. 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. The method is recommended
for further mapping of introduced sessile
species in Norway, and we recommend
establishment of a taxonomic network in
Norway for validation of observations of
introduced species.