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Table 1 Model averaged parameter estimates (β ± SE) and cumulative Akaike weights (∑ w i) for the effects of age, δ2Hf, and Julian capture date on movement patterns. Generalized linear models include: the probability of making a migratory movement (binomial), tracking duration in hours, cumulative and net displacement in kilometres, and tortuosity (Gaussian), and number of flights (Gamma) of Blackpoll Warblers tracked around the Gulf of Maine during fall migration. Capture location and year were included in all models. Models of the decision to migrate and tracking durations included all individuals with non-ambiguous movements, while cumulative and net displacement, angular concordance and number of flights only included individuals moving in indirect patterns

From: Migratory blackpoll warblers (Setophaga striata) make regional-scale movements that are not oriented toward their migratory goal during fall

Variable   Decision to Migrate Tracking Time1/2 Log (Cum Dist.) Log (Net Disp.) Angular Conc. Number of Flights
Intercept β ± se −15.6366 ± 12.4385 116.0281 ± 17.7590 4.5002 ± 2.5502 0.7596 ± 1.5955 0.0758 ± 0.9517 −0.0059 ± 0.4841
Age (Hatch-year) β ± se −0.3299 ± 0.5344 −0.3025 ± 0.8388 −0.1011 ± 0.1340 0.2010 ± 0.2165 0.2250 ± 0.1314 0.0867 ± 0.0343
∑ wi 0.43 0.31 0.51 0.61 0.87 0.96
δ2Hf β ± se −0.0138 ± 0.0144 0.0257 ± 0.0295 −0.0012 ± 0.0023 −0.0024 ± 0.0038 −0.0004 ± 0.0014 0.0001 ± 0.0004
∑ wi 0.63 0.58 0.38 0.44 0.26 0.25
Capture date β ± se 0.0475 ± 0.0434 - 0.3474 ± 0.0639 −0.0088 ± 0.0094 0.0003 ± 0.0057 0.0024 ± 0.0068 0.0010 ± 0.0018
∑ wi 0.70 1.00 0.61 0.22 0.23 0.39
Capture site (Seal Island) β ± se 0.4646 ± 0.5955 −0.2568 ± 1.2541 0.1784 ± 0.1295 0.2963 ± 0.1902 −0.0399 ± 0.1071 −0.0361 ± 0.0309
Year (2015) β ± se −0.2120 ± 0.6268 - 1.2884 ± 1.3381 0.1055 ± 0.1326 0.3660 ± 0.1957 0.2358 ± 0.1081 0.0552 ± 0.0333