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Migration Routes and Strategies in a Highly Aerial Migrant, the Common Swift Apus apus, Revealed by Light-Level Geolocators

Figure 3

Travel rate for migrating swifts in relation to latitude.

Daily travel rate in relation to latitude calculated for 3-day segments for six migrating swifts for periods of actual travel during (A) autumn and (B) spring migration, respectively. The curves show second degree polynomial fitted to the data: (A) Utrav = 155.5+15.6 Lat –0.29 Lat2, with maximum travel rate at latitude 27.1°N; (B) Utrav = 278.4+19.3 Lat –0.39 Lat2, with maximum travel rate at latitude 24.8°N.

Figure 3

doi: https://doi.org/10.1371/journal.pone.0041195.g003