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Abstract:

Nest-site selection and nest defense are strategies for reducing the costs of brood parasitism and nest predation, two selective forces that can influence avian nesting success and fitness. During 2001-2002, we analyzed the effect of nest-site characteristics, nesting pattern, and parental activity on nest predation and brood parasitism by cowbirds (Molothrus spp.) in a population of Brown-and-yellow Marshbirds (Pseudoleistes virescens) in the Buenos Aires province, Argentina. We examined the possible effects of nest detectability, nest accessibility, and nest defense on rates of parasitism and nest predation. We also compared rates of parasitism and nest predation and nest survival time of marshbird nests during the egg stage (active nests) with those of the same nests artificially baited with passerine eggs after young fledged or nests failed (experimental nests). Most nests (45 of 48, or 94%) found during the building or laying stages were parasitized, and 79% suffered at least one egg-predation event. Cowbirds were responsible for most egg predation, with 82 of 107 (77%) egg-predation events corresponding to eggs punctured by cowbirds. Nests built in thistles had higher rates of parasitism and egg predation than nests in other plant, probably because cowbirds were most active in the area where thistles were almost the only available nesting substrate. Parasitism rates also tended to increase as the distance to conspecific nests increased, possibly due to cooperative mobbing and parental defense by marshbirds. The proportion of nests discovered by cowbirds was higher for active (95%) than for experimental (29%) nests, suggesting that cowbirds used host parental activity to locate nests. Despite active nest defense, parental activity did not affect either predation rates or nest-survival time. Thus, although nest defense by Brown-and-yellow Marshbirds appears to be based on cooperative group defense, such behavior did not reduce the impact of brood parasites and predators. © 2009 Association of Field Ornithologists.

Registro:

Documento: Artículo
Título:Effects of nest-site characteristics and parental activity on cowbird parasitism and nest predation in Brown-and-yellow Marshbirds
Autor:Svagelj, W.S.; Fernández, G.J.; Mermoz, M.E.
Filiación:Laboratorio de Ecología y Comportamiento Animal, Departamento de Ecología, Genética y Evolución, Pabellón II Ciudad Universitaria, C1428EHA Buenos Aires, Argentina
Biología y Manejo de Recursos Acuáticos, Centro Nacional Patagónico (CENPAT-CONICET), Blvd. Brown 2825, Puerto Madryn (U9120ACF), Chubut, Argentina
Palabras clave:Concealment; Egg losses; Experimental nests; Host activity; Molothrus spp; Nest-searching method; Partial nest predation; Aves; Molothrus; Passeriformes; Pseudoleistes virescens
Año:2009
Volumen:80
Número:1
Página de inicio:9
Página de fin:18
DOI: http://dx.doi.org/10.1111/j.1557-9263.2009.00200.x
Título revista:Journal of Field Ornithology
Título revista abreviado:J. Field Ornithol.
ISSN:02738570
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_02738570_v80_n1_p9_Svagelj

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Citas:

---------- APA ----------
Svagelj, W.S., Fernández, G.J. & Mermoz, M.E. (2009) . Effects of nest-site characteristics and parental activity on cowbird parasitism and nest predation in Brown-and-yellow Marshbirds. Journal of Field Ornithology, 80(1), 9-18.
http://dx.doi.org/10.1111/j.1557-9263.2009.00200.x
---------- CHICAGO ----------
Svagelj, W.S., Fernández, G.J., Mermoz, M.E. "Effects of nest-site characteristics and parental activity on cowbird parasitism and nest predation in Brown-and-yellow Marshbirds" . Journal of Field Ornithology 80, no. 1 (2009) : 9-18.
http://dx.doi.org/10.1111/j.1557-9263.2009.00200.x
---------- MLA ----------
Svagelj, W.S., Fernández, G.J., Mermoz, M.E. "Effects of nest-site characteristics and parental activity on cowbird parasitism and nest predation in Brown-and-yellow Marshbirds" . Journal of Field Ornithology, vol. 80, no. 1, 2009, pp. 9-18.
http://dx.doi.org/10.1111/j.1557-9263.2009.00200.x
---------- VANCOUVER ----------
Svagelj, W.S., Fernández, G.J., Mermoz, M.E. Effects of nest-site characteristics and parental activity on cowbird parasitism and nest predation in Brown-and-yellow Marshbirds. J. Field Ornithol. 2009;80(1):9-18.
http://dx.doi.org/10.1111/j.1557-9263.2009.00200.x