Salinity tolerance of the invasive Pacific oyster (Crassostrea gigas).
The invasive Pacific oyster (Crassostrea gigas) settles on hard substrate such as stones or other bivalves. When it settles it cements to the surface and during growth it will cement together with other Pacific oyster forming large oyster reefs. The Pacific oyster is known to tolerate salinities of up to 38 ppt and has an optimal salinity range of 20 35 ppt. The oyster tolerates temperatures of -1.8 - 35 °C, but to reproduce it needs water temperatures of 20 °C. Hence, the Pacific oyster owes its invasiveness to a highly plastic physiology, which makes it very tolerant to different environmental conditions. From its arrival in the Danish Wadden Sea it took the Pacific oyster 13 years to form very extensive oyster reefs. In other parts of Danish marine waters the Pacific oyster is known to be present in moderate numbers (e.g., Limfjorden, Randers fjord and Isefjorden). Some very recent observations in my group have shown small specimens of the Pacific oyster to be present in Øresund and off the southern part of Fyn. Therefore the oyster is now known to be present at salinities far below 20 ppt.
|Anvendte metoder:||Intermittent respirometry, clearance rate (Coulter counter)|
|Keywords:||Invasive species, Pacific oyster, oxygen consumption, clearance rate, osmotic stress|