Life cycle and population dynamics of the Asian clam Corbicula fluminea (Bivalvia: Corbiculidae) in the Rhône River at Creys-Malville (France)
published: Jul 9, 2001
ArtNo. ESP141015104002, Price: 29.00 €
The Corbicula fluminea population in the Villebois Reservoir located on the French Upper Rhône, was sampled every month from September 1996 to December 1999. These populations are characterised by: a single annual reproduction period that starts during July after the floods caused by melting snow and ends in September; slow growth varying considerably from one year to the next; a growth period that extends from July-August to September-October and which only starts for most of the juveniles on the year after their birth; a life span of 5 years. The hydraulic developments constructed by the Compagnie Nationale du Rhône have considerably favoured the colonisation of the Upper Rhône by Corbicula. Nonetheless, this sector of the river is affected by major variations of flow and temperature following the snow melt, as well as hydropower generation, leading to a stressful environment for C. fluminea. However, it is above all the low quantities of available food, especially chlorophyll-a which are responsible for the low annual growth rate of individuals and probably the low recruitment observed in 1998 and 1999.