Fig. 6
Long-term data series of (solid points) observed and (open points) expected numerical densities (nm−2) of adult (age at least 2.3 years) Limecola balthica on Balgzand. Expected densities calculated on the base of a observed densities of each cohort at an age of 1.3 years and supposed constant annual survival rates of 65% year−1 in subsequent years, and b observed annual survival rates and supposed densities of 32 ind m−2 of each cohort at an age of 1.3 years. The dashed horizontal lines show expected densities when both initial density and annual survival were constant at the above values