Recurrence, fidelity, and proximity to previously visited sites throughout the annual cycle in a trans-Saharan migrant, the Common Cuckoo
Data files
Mar 04, 2024 version files 228.30 KB
Abstract
Most migratory birds return every year to the same breeding sites and some species show a similarly high fidelity to wintering grounds as well. Fidelity to stopover sites during migration has been much less studied and is usually found to be lower. Here, we investigate site fidelity and distance to previously visited sites throughout the annual cycle in the common cuckoo, a nocturnal trans-Saharan migrant, based on satellite-tracking data from repeated annual migrations of thirteen adult males. All birds (100%) returned to the same breeding grounds, with a median shortest distance of only 1 km from the locations in previous year. This was in strong contrast to a much lower and much less precise site fidelity at non-breeding sites during the annual cycle: In only 18% of the possible cases in all non-breeding regions combined, did the cuckoos return to within 50 km of a previously visited non-breeding site, with no significant differences among the main staging regions (Europe in autumn, Sahel in autumn, wintering in Central Africa, West Africa in spring, Europe in spring). The shortest distance to a previously visited non-breeding site differed among the staging regions with median shortest distances for the longest stopovers of 131 km [2;1223] (median [min;max]) in Europe, 207 km [1;2222] in Sahel in autumn and 110 km [0;628] in Central Africa. The distance to a previously visited staging site decreased with the time spent at the stopover in a previous year. Understanding the drivers of recurrence and site selection in migratory birds are important for guiding conservation efforts in this group but further studies are needed to establish whether the patterns observed in cuckoos are general among terrestrial migrants with continuous distribution of habitat.
README: Recurrence, fidelity, and proximity to previously visited sites throughout the annual cycle in a trans-Saharan migrant, the Common Cuckoo
https://doi.org/10.5061/dryad.r4xgxd2mv
Description of the data and file structure
The file contains satellite-tracking data of the best daily position from 13 adult Common Cuckoos that were tracked during two, three, or four successive years, from June 2010 to February 2015 as described in Willemoes et al. 2014 and Hewson et al. 2016.
Data fields are individual ID (ID), date and time (timestamp), geographical location (location-long, location-lat), geographical identification of stopover (Stopover), stopover region (Major_Stop), duration of stopover (DaysStop), year tracked (Migration_cycle) and Argos location quality (argos:lc). If no stopover region (Major_Stop) could be assigned to a location, the cell was left empty.
Hewson, C. M., Thorup, K., Pearce-Higgins, J. W. and Atkinson, P. W. 2016. Population decline is linked to migration route in the Common Cuckoo. – Nature Communications 7: 12296.
Willemoes, M., Strandberg, R., Klaassen, R. H. G., Tøttrup, A. P., Vardanis, Y., Howey, P. W., Thorup, K., Wikelski, M. and Alerstam, T. 2014. Narrow-front loop migration in a population of the common cuckoo (Cuculus canorus) as revealed by satellite telemetry. – Plos One 9: e83515.