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Table 2 Summary statistics of a generalized least squares model fitted by restricted maximum likelihood (REML) predicting seasonal mass gain by migratory status using 8198 individuals of 33 species with body mass measured at least across two seasons between 2001 and 2013 in Nigeria

From: Body reserves in intra-African migrants

Variable df F Estimate Error t p
Intercept 1 1,15,974.2 0.28 0.005 58.1 <0.001
Migrant 2 530.5 0.09 0.005 18.8 <0.001
Resident    0.09 0.006 15.2 <0.001
Start wet 3 226.9 0.07 0.013 5.2 <0.001
End wet    −0.02 0.004 −6.1 <0.001
Start dry    −0.03 0.004 −7.2 <0.001
Fat score 1 3156.6 0.04 0.001 45.2 <0.001
Pectoral muscle score 1 193.7 0.02 0.002 12.5 <0.001
Wing length 1 1096.0 0.01 0.000 33.0 <0.001
Migrant × start wet 6 38.4 −0.05 0.014 −3.4 <0.001
Resident × start wet    −0.04 0.015 −2.8 0.005
Migrant × end wet    0.10 0.008 13.6 <0.001
Resident × end wet    0.05 0.009 5.2 <0.001
Migrant × start dry    0.06 0.009 6.3 <0.001
Resident × start dry    0.02 0.009 1.8 0.0735
Residual 8183    0.070   
  1. Variances within species, seasons, and status were modelled as random effects. Mass gain ~ status + season + fat + pectoral muscle + wing length + status × season. Palearctic migrants and end of dry season are set as the intercept in the model
  2. Significant p values are indicated in bold