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Table 2 Results of Pearson’s correlations between provisioning parameters depending on the percentage of larvae among the preys delivered to the nestlings in one hour

From: Inter-individual variation in provisioning rate, prey size and number, and links to total prey biomass delivered to nestlings in the Collared Flycatcher (Ficedula albicollis)

  Percentage of larvae among the preys
1st tertile (few larvae) 2nd tertile (mixed) 3rd tertile (many larvae)
N = 54 N = 53 N = 57
r [95% CI] P r [95% CI] P r [95% CI] P
Prey size—prey number − 0.692 [0.810; 0.522]  < 0.001 − 0.640 [0.776; 0.447]  < 0.001 − 0.404 [0.601; 0.160] 0.002
Prey number—feeding rate 0.172 [0.420; 0.100] 0.217 − 0.330 [0.545; 0.057] 0.017 0.045 [0.302; 0.218] 0.743
Prey size—feeding rate 0.237 [0.475; 0.032] 0.087 0.217 [0.461; 0.056] 0.122 − 0.335 [0.548; 0.081] 0.012
  1. Significant fixed effects are reported in bold. Data are divided in 3 tertiles, depending on whether a parent was bringing few larvae (1st tertile; < 44.3%), a mixed of larvae and other preys (2nd tertile; 44.3%‒66.7%), or mostly larvae (3rd tertile; > 66.7%). Data are on 164 individuals