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Table 1 Coefficients of between-species Spearman correlation estimates of population densities (n m−2) of year classes in 4 bivalve species (Cerastoderma edule, Mytilus edulis, Mya arenaria and Limecola balthica) as assessed at an age of 0.3 year (in August of their first summer), 0.8 year (in February/March at the end of their first winter), and 1.8 year at the end of their second winter) for the 1973–2016 period (n = 44)

From: Is food supply for shellfish-eating birds in the western Wadden Sea affected by the between-species synchrony in year-to-year fluctuations of bivalve population parameters?

Age (years) 0.3 0.8 1.8
CerastodermaMytilus 0.64*** 0.48** 0.30*
CerastodermaMya 0.63*** 0.52*** 0.28
MytilusMya 0.55*** 0.27 0.05
CerastodermaLimecola 0.43** 0.34* 0.21
MytilusLimecola 0.36* 0.29 0.27
MyaLimecola 0.35* 0.12 0.24
  1. Statistical significance indicated without Bonferroni correction: *(p < 0.05), **(p < 0.01) or ***(p < 0.001). With this correction (n = 6: the number of calculations within a column) one * should be omitted