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Table 5 Long-term trends in (1) annual recruitment (n m−2 at an age of 0.3, 0.8, and 1.8 year) for the 1973–2015 period (n = 43), (2) survival (% still present half a year after the age of 0.3 year, 1 year after an age of 0.8 year, and 1 year after an age of 1.8 year or more) for 15 to 40 years of the 1973–2015 period (calculated only if at least 10 m−2 were present at the start of the period), (3) growth rate (g AFDM ind−1) for the 1976–2014 period (n = 18 to 29), and (4) late-winter biomass (g AFDM m−2) for the 1973–2018 period (n = 46)

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) Recruitment Survival Growth Biomass
0.3 0.8 1.8 0.3–0.8 0.8–1.8 1.8+
Cerastoderma edule − 0.44** − 0.09 + 0.20 + 0.25 + 0.35 + 0.14 − 0.23 − 0.15
Mytilus edulis − 0.26 − 0.09 − 0.05 + 0.18 − 0.16 − 0.44 + 0.11 − 0.11
Mya arenaria − 0.09 + 0.12 + 0.34* + 0.33 − 0.17 − 0.03 + 0.12 + 0.57***(+0.31*)
Limecola balthica − 0.68*** − 0.49** − 0.41** + 0.55** + 0.29 − 0.66*** − 0.02 − 0.51***
  1. Significance indicated by * (p < 0.05), ** (< 0.01) or *** (< 0.001); Spearman rank test. Biomass data for Mya arenaria separately for all individuals and (between brackets) for those of < 5 cm shell length