IADIZA   20886
INSTITUTO ARGENTINO DE INVESTIGACIONES DE LAS ZONAS ARIDAS
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Nestling provisioning does not increase nest predation risk in a south temperate population of Sedge Wrens (Cistothorus platensis platensis)
Autor/es:
P. E. LLAMBIAS; M. M. JEFFERIES
Lugar:
Puerto Iguazú
Reunión:
Congreso; Ornithological Congress of the Americas; 2017
Institución organizadora:
Aves Argentinas en conjunto con la Association of Field Ornithologists (AFO) y Sociedade Brasileira de Ornitología (SBO).
Resumen:
Nest predation is a selective force that can shape parental investment in birds. Under strong predation pressure, birds are predicted to reduce clutch size and parental activity near the nest. Understanding how nest predation is affected by parental activity can shed new light on our understanding of life-history strategies. We carried out fieldwork in a Sedge Wren (Cistothorus platensis platensis) population in the Uspallata Valley (Argentina) to evaluate if parental activity increases the risk of nest predation. During 2011-2015 we monitored 397 nesting attempts. We filmed nests when nestlings were 2-3, 7-8 and 11-12d old to record nestling provisioning rates (feeding trips/hour). We used Cox proportional hazard models to examine whether predation risk was enhanced with high nestling provisioning rates. Only 30.51% of the nests were successful, and 49.51% of all nest failures were caused solely by nest predation. Estimates of nest predation rates were higher during the nestling stage (58.68%) than during incubation (7.16%) and laying periods (3.96%). Nestling provisioning increased with nestling age, however parental activity did not increase nest predation risk. Furthermore, predation risk declined with nestling age. Future research should evaluate if nest predation risk is affected by nest detectability, nestling begging behavior and nest defense.