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Population dynamics and life cycle of Pisidium amnicum (Müller) (Bivalvia : Sphaeriidae) and Valvata piscinalis (Müller) (Gastropoda : Prosobranchia) in the Saône river, a nine-year study
Annales de Limnologie
The population dynamics and life cycle of two mollusc species Pisidium amnicum and Valvata piscinalis of the Saône river were studied for nine years. The newborn of the former species appeared in April each year. The latter species produced two cohorts per year until 2003. Spawning in spring led to the birth of the early cohort, which generally appeared in May, while spawning in the summer led to the birth of the late cohort, which appeared from July to November. The increase of the mean annualdoi:10.1051/limn:2008008 fatcat:wylfcrftofhm7jgm3sjpkg5n3a