BIOTIC Species Information for Corbula gibba
|Researched by||Lizzie Tyler||Data supplied by||University of Sheffield|
|Refereed by||This information is not refereed.|
||Feeding method||Passive suspension feeder
Active suspension feeder
|Typical food types||Phytoplankton, diatoms and bacteria.||Habit||Free living|
|Bioturbator||Flexibility||None (< 10 degrees)|
|Height||Insufficient information||Growth Rate||See additional information|
|Adult dispersal potential||100-1000m||Dependency||Independent|
|General Biology Additional Information||Growth
Corbula gibba is a small bivalve mollusc. The growth rate of Corbula gibba is rapid during the first few months of its juvenile stage although it is very slow in adults (Jensen, 1990). In Nissum Bredning, Denmark the growth of juvenile Corbula gibba was rapid during their first two months (July-August) but leveled off in September and October at lengths ranging from 2.9-3.5 mm (Jensen, 1988). Thus juvenile Corbula gibba reached a size of 3 mm within the first 1-2 months after settling (Jensen, 1990). The absolute growth rate for that period was about 0.03 mm/day and remained constant until the end of August. No further growth was observed in September and October (Jensen, 1988). One year after juvenile settlement, specimens reached a mean size of 6 -7 mm. In the Limfjord (Denmark) it was suggested that the variation in growth rates was caused by variable frequencies of wind induced resuspension of settled organic matter. In the Limfjord wind speeds above Beaufort force 8 caused mixing of the water column and probably resuspension of bottom material in 1986. These conditions probably favour Corbula gibba as it is one of the most efficient bivalve particle feeders (Kiøboe & Mohlenberg, 1981). In 1985 the wind speeds never exceeded force 8 and no mixing was observed. This resulted in lower abundances of Corbula gibba and slower growth rates (Jensen, 1990).
Slower growth rates have been recorded in the Danish Sound where it took a population of Corbula gibba seven months to reach a mean size of 1.1 mm (Muss, 1973). Whereas in Port Erin on the Isle of Man it took one year for a population of juveniles to reach a mean size of 4 mm (Jones, 1956, Jensen, 1990). Jones (1956) also reported that the specimens of Corbula gibba on the Isle of Man had a modal length of 2.25 mm. Jensen (1990) suggested that the higher growth rates in the 1990's in Danish waters could be the result of specific events such as eutrophication. However, in Nissum Bredning no specimens were found over two years old in 1990. The size of Corbula gibba around the British Isles ranged from 0.5 mm in length to 1.2 cm in the 1940's (Yonge, 1946), and in Australian waters it can reach sizes up to 1.5 cm (CRIMP, 2000).
Biomass / Production
|Biology References||Jensen, 1990, Rasmussen, 1973, Lauckner, 1983, Jensen, 1988, CRIMP, 2000, Kiørboe & Møhlenberg, 1981, Hrs-Brenko, 1981, Yonge, 1946, Jones, 1956, Yonge & Thompson, 1976, Muus, 1973, Pearson & Rosenberg, 1978, Talman & Keough, 2001, Christensen, 1970, McEnnulty et al., 2001a, NIMPIS, 2002, Healy & Lamprell, 1996, Hayward & Ryland, 1990,|