| Titre : | Factors affecting breeding success of Peregrine and Lanner Falcons in South Africa |
| Auteurs : | A. R. Jenkins, Auteur |
| Type de document : | Article |
| Dans : | Ostrich (71(3-4) SEP 2000) |
| Article en page(s) : | 385-392 |
| Langues: | Anglais |
| Résumé : | Breeding success was recorded for three Peregrine Falcon, Falco peregrinus, populations in South Africa over nine years, and for Peregrine and Fanner Falcon, F. biarmicus, populations in on area of sympatry over three years. The objectives of the study were to; :measure geographic and interspecific variation in reproductive performance, and determine environmental correlates of productivity. Territory occupancy, the frequency of breeding per occupied territory and clutch size did not vary significantly between the three Peregrine populations. However, Peregrine breeding success was generally lower on the Cope Peninsula (1.11 young fledged per territorial pair), higher in the Soutpansberg (1.35) and highest on the Orange River (1.70). Overall, fledging rates of Soutpansberg Peregrines and Lanners were not significantly different, although annual productivity of the Lanner papulation was consistently higher. Neither species' breeding success was significantly depressed by the presence of close neighbouring pairs of the other, suggesting that they were not active competitors, Breeding performance of Peregrine; on the Cope Peninsula correlated strongly with spring weather conditions: egg and hatchling survival was lower in wet years, and fledging rates were higher in warm years. Annual productivity of Orange River Peregrines correlated positively with the height of the river at the onset of breeding, and productivity of Soutpansberg Peregrines was higher in seasons following years of high rainfall. Elements of the physical structure of the nesting habitat (exposure of the nest ledge, height of the nest cliff) correlated positively with Peregrine breeding performance. Breeding success of Soutpansberg Lanners was largely unaffected by any of the environmental variables considered. Overall, it is proposed that Peregrine productivity reflected variation in the physical environment and its affect on prey availability. |
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