The migration starting date (MSD) of 30 Eurasian Teal and 8 Eurasian Stone-curlews was estimated by processing tracking data with four methods. A significant difference was found for Teal, with methods fitting models on Net Square Displacement postponing MSD compared to distance threshold methods. In Stone-curlews the four methods provided comparable MSD estimates. The reliability of Teal MSD was evaluated comparing the estimated ratio between time at stopover/time in flight with the ratio expected from the optimal migration theory. Threshold methods provided estimates closer to the ratio expected for time-minimizing migrants and therefore seems the most reliable approach, especially for datasets with irregular sampling and variable migratory strategies.

Simpler methods can outperform more sophisticated ones when assessing bird migration starting date

Cerritelli, G.
Primo
;
Vanni, L.
Secondo
;
Luschi, P.;Giunchi, D.
Ultimo
2020-01-01

Abstract

The migration starting date (MSD) of 30 Eurasian Teal and 8 Eurasian Stone-curlews was estimated by processing tracking data with four methods. A significant difference was found for Teal, with methods fitting models on Net Square Displacement postponing MSD compared to distance threshold methods. In Stone-curlews the four methods provided comparable MSD estimates. The reliability of Teal MSD was evaluated comparing the estimated ratio between time at stopover/time in flight with the ratio expected from the optimal migration theory. Threshold methods provided estimates closer to the ratio expected for time-minimizing migrants and therefore seems the most reliable approach, especially for datasets with irregular sampling and variable migratory strategies.
2020
Cerritelli, G.; Vanni, L.; Baldaccini, N. E.; Lenzoni, A.; Sorrenti, M.; Falchi, V.; Luschi, P.; Giunchi, D.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11568/1037933
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