Fig. 5
Mytilus edulis. Long-term series of successive estimates for the mussel population on Balgzand (means of all 15 sampling sites): a net annual somatic production of soft parts P expressed in g AFDM m−2 a−1; b mean annual biomass B expressed in g AFDM m−2 ; c annual P/B ratio expressed in a−1. Year of growing season (Y) is indicated on horizontal axis. Only the long-term trend in biomass was significantly different from a horizontal line: B = 217 − 0.108 Y, r = −0.45, n = 26, P < 0.05