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Table 2 Results from the regression analysis between winter and spring temperatures (January–May) and mean annual Acartia sp. numbers and Acartia sp. season length (number of months with abundance > 1,000 m 3), mean annual Centropagus hamatus numbers and Centropagus hamatus season length (number of months with abundance > 500 m 3) and mean annual total copepod numbers and copepod season length (number of months with abundance > 1,000 m 3)

From: Zooplankton response to a warmer northern Wadden Sea

Independent value

Dependent value

Method

Result

Temperature

Acartia sp. (mean annual abundance)(season length)

Spearman

Pearson

R = 0.53; N = 21; P < 0.012

R2 = 0.45; N = 21; P < 0.001

Temperature

C. hamatus (mean annual abundance) (season length)

Spearman

Pearson

R = 0.61; N = 21; P < 0.0034

not significant (P = 0.41)

Temperature

Total copepods (mean annual abundance) (season length)

Pearson

Pearson

R2 = 0.40; N = 21; p < 0.002

R² = 0.38; N = 21; P < 0.003

  1. Data from 1989 were omitted (no data for April–June). Acartia sp. and Centropagus hamatus represent 75 ± 5% of total copepod numbers