出版社：Government of Western Australia / Department of Fisheries
摘要：A survey of the Swan River region for four non-indigenous marine species was conducted in
2007: the European shore crab Carcinus maenas, the Asian bag mussel Musculista senhousia,
the European fan worm Sabella spallanzanii, and the scallop Scaeochlamys livida. The first
three of these species are global in their distribution and on the ¡®top-ten world¡¯s worst invaders
listing; the last species is introduced from the eastern states of Australia.
In this survey divers on SCUBA examined 43 sites for each of the listed species. Despite
previous records of Carcinus maenas and Musculista senhousia in this region the diver visual
surveys found no evidence of either species. The European fan worm, despite anecdotal reports
that it had died out in the Swan region, has actually increased its geographic spread, though
the densities of this species in the more open waters of Cockburn Sound are much reduced
from those reported in the early 1990¡¯s. The scallop Scaeochlamys livida has well-established
populations in Cockburn Sound and the Swan River. There is some speculation that this species
may have displaced the ¡®native scallop¡¯ Mimachlamys asperrimus.
There are currently 46 known non-indigenous species in the Cockburn Sound and Fremantle
Harbour area. These species have the capacity to be translocated within the Swan River region
quite easily; furthermore they have the capacity to be translocated to iconic areas such as Rottnest
Island. As such, a study into the potential of these species to be translocated is needed.
Loading...
