Estimation of Density-Dependent Mortality of Juvenile Bivalves in the Wadden Sea

摘要: We investigated density-dependent mortality within the early months of life bivalves Macoma balthica (Baltic tellin) and Cerastoderma edule (common cockle) in Wadden Sea. Mortality is thought to be juvenile bivalves, because there no proportional relationship between size reproductive adult stocks numbers recruits for both species. It not known however, when exactly density dependence pre-recruitment phase occurs how prevalent it is. The magnitude recruitment determines year class strength bivalves. Thus, understanding pre-recruit will improve population dynamics. analyzed count data from three years temporal sampling during first after bivalve settlement at ten transects Sylt-Romo-Bay northern German Analyses are sensitive bias through measurement error. Measurement error was estimated by bootstrapping, residual deviances were adjusted adding process With simulations effect these two types on estimate coefficient investigated. In out eight time intervals detected M. balthica, zero six C. edule. Biological or environmental stochastic processes dominated over scale.