| Titre : | Dispersal dynamics of juvenile Secretarybirds Sagittarius serpentarius in southern Africa (2019) |
| Auteurs : | Melissa A. Whitecross, Auteur ; Ernst F. Retief, Auteur ; Hanneline A. Smit-Robinson, Auteur |
| Type de document : | Article |
| Dans : | Ostrich (90(2) May, 2019) |
| Article en page(s) : | 97-110 |
| Mots-clés: | Secretarybird ; dispersal ; home range ; juvenile ; tracking |
| Résumé : | Knowledge of the dispersal behaviour of southern Africa’s juvenile Secretarybirds Sagittarius serpentarius was previously limited to a small number of ring recoveries (n = 4) in South Africa. From 2012 to 2015, 10 GSM-GPS solar trackers were fitted to juvenile Secretarybirds, aged approximately eight weeks, on their nests. The birds spent an average of 91.30 ± 8.80 d in their natal territories, which had a mean home range size (kernel density estimate 90%) of 1.21 ± 0.34 km2. As they aged, their exploratory movements around the nest expanded exponentially. During this period, exploratory activity peaked between 09:00 and 12:00. They showed high variability in maximum distance travelled from the nest and timing of dispersal from their natal territories. Most of the birds (n = 7) dispersed >150 km from their nests before returning to their natal region, suggesting the existence of natal philopatry in this species. The age of first breeding for a male Secretarybird was also confirmed during this study. The wide-ranging behaviour of juvenile Secretarybirds exposes them to a diverse range of threats, and a better understanding of their movements will aid the development of appropriate conservation strategies for this terrestrial raptor. |
| En ligne : | https://doi.org/10.2989/00306525.2019.1581295 |



