Simultaneous effects of age and territory quality on fecundity in Bonelli's Eagle<i>Hieraaetus fasciatus</i>

Penteriani, Vincenzo; Balbontı́n, Javier; Ferrer, Miguel

doi:10.1046/j.1474-919x.2003.00159.x

Cited by 71 publications

(79 citation statements)

References 31 publications

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“…Nevertheless, human impact may hamper the ability of birds to recognize and occupy the best suited places for reproduction, decreasing the intensity of relationship between population density and breeding success (Bock and Zach 2004). This seems not to be the case for Bonelli's eagle in Spain, because the younger reproductive individuals (less than 4 years of age) usually nest in less favourable areas (closer to roads and urban areas than adults; Penteriani et al 2003), and several authors have described that the Bonelli's eagle occupies areas of high human density in man-made environments (Gil-Sánchez et al 1994;López-López et al 2004).…”

Section: Discussionmentioning

confidence: 99%

Linking density, productivity and trends of an endangered species: The Bonelli's eagle in Spain

Carrascal

Seoane

2009

Acta Oecologica

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It is controversial if regional population density is a good indicator of environmental quality according to demographic variables such as breeding success or short-term population trends. In this paper we analyze the interrelationships among regional population density, breeding success and recent population trends of an endangered species, the Bonelli's eagle in the Iberian Peninsula. It is also analyzed the different influence of geographical, climatic, landscape structure and human impact variables on regional variation in those demographic variables. Breeding success was higher and population decrease was lower in those areas where the population density of Bonelli's eagle was greater. The tightly related productivity, density and recent population trends of Bonelli's eagle increased from northern to southern Iberian Peninsula (with highest figures at intermediate latitudes), and as sun radiation increased, and altitude decreased. Breeding success and population density were significantly lower in the periphery of the distribution range than in core areas in the Iberian Peninsula. Population trends between 2000 and 2005 were also more negative (decreasing) in the periphery. Overall, these results suggest that population density in this endangered species of large home-range is a good indicator of environmental quality and reproductive output, and that peripheral populations occupy low suitability areas with lower breeding success, and more probable negative short term population trends.

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Section: Discussionmentioning

confidence: 99%

Linking density, productivity and trends of an endangered species: The Bonelli's eagle in Spain

Carrascal

Seoane

2009

Acta Oecologica

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“…Afirma-se isso a partir da premissa que o jovem permanece na vizinhança de onde nasceu (NOLAN, 1978;BOCETTI, 1993). Por exemplo, o jovem da espécie Hylocichla mustelina (GMELIN, 1789) (Passeriformes, Thamnophilidae) se mantém em uma área de 500 metros de raio de onde nasceu (POWELL, et al, 1995).…”

Section: Resultados E Discussõesunclassified

“…As aves insetívoras são consideradas sensíveis à fragmentação florestal e destruição da restinga, o que afeta sua abundância e ocorrência (WILLIS, 1979;WILSON et al, 1994;STOTZ et al, 1996;SEKERCIOGLU, 2002 O território pode ser definido por uma área que o animal defende contra indivíduos da mesma espécie ou contra outras espécies, sendo essencial para garantir recursos e por consequência o sucesso reprodutivo. Desse modo, o território influencia a estabilidade ou a regulação da população em sistemas sociais, sendo então um importante atributo que determina a densidade de uma população e afeta a distribuição local e abundância de predadores e presas (CARPENTER, 1987;PENTERIANI et al, 2003). Em alguns casos a defesa de territórios, força outros indivíduos a formar uma população de não reprodutores, chamada de "flutuantes".…”

Section: Introductionunclassified

Territory size ofFormicivora rufa(Wied, 1831) (Passeriformes, Thamnophilidae) in southeast Brazil

Araújo-Lima

2013

Revista Ambiência

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ResumoAs chances de sobrevivência das espécies podem estar relacionadas com a capacidade de deslocamento entre os fragmentos florestais. Assim, torna-se fundamental a compreensão da capacidade de suporte dos fragmentos remanescentes para o seu deslocamento periódico, já que densidade populacional da espécie é um dos fatores que pode determinar se haverá ou não deslocamento entre os fragmentos. O objetivo deste trabalho foi aumentar o conhecimento sobre a espécie Formicivora rufa (Papa-formiga-vermelho). O estudo foi realizado em uma área inserida no Parque Estadual Paulo César Vinha e na APA de Setiba, localizados no município de Guarapari (ES). Os territórios foram mapeados e mensurados através do método do Mínimo Polígono Convexo (MPC). A média do tamanho dos territórios foi de 0,05 ha. Os resultados mostraram também uma correlação positiva entre a quantidade de indivíduos em um território em relação ao tamanho do território, que é justificado pelo fato de vários indivíduos juntos conseguirem defender uma área maior em relação a poucos indivíduos da mesma espécie.Palavras-chave: mata atlântica; mínimo polígono convexo; papa-formigavermelho. AbstractThe survival probabilities of the species are related to the ability to shift between the forest fragments. Thus, it becomes essential to understand the carrying capacity of the remaining fragments for the periodic displacement of species. Although there may still be appropriate conditions for local migration, the population density of the species will determine whether there is movement between fragments.

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“…In turn, territories with nestlings in bad body condition may be of low quality due to the poor quality/low quantity of prey or other negative environmental factors (e.g., human disturbance). In this regard, Penteriani, Balbontin, and Ferrer (2003) observed that more than 60% of recorded causes of breeding failure in Bonelli’s eagles were related to human presence and disturbance. Therefore, our results suggest that the body condition of chicks may provide a more accurate measurement of breeding condition than the number of fledged chicks.…”

Section: Discussionmentioning

confidence: 99%

“…This means that Bonelli’s eagles rarely recruit into a new territory. Under this scenario, the recruitment of nonadult individuals could be enhanced by a sudden rise in adult mortality, which will increase the probability that juvenile floaters find and/or occupy a vacant territory or mate with the remaining owner of the territory (Carrascal & Seoane, 2009; Carrete et al., 2006; Penteriani et al., 2003). This phenomenon may explain why males recruit at a younger age than female Bonelli’s eagles, as mortality rates are higher in males than in females in the studied population (Hernández‐Matías, Real, Pradel, Ravayrol, et al., 2011).…”

Section: Discussionmentioning

confidence: 99%

Effects of rearing conditions on natal dispersal processes in a long‐lived predator bird

Azpillaga

Real

Hernández‐Matías

2018

Ecology and Evolution

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Natal or prebreeding dispersal is a key driver of the functioning, dynamics, and evolution of populations. Conditions experienced by individuals during development, that is, rearing conditions, may have serious consequences for the multiple components that shape natal dispersal processes. Rearing conditions vary as a result of differences in parental and environmental quality, and it has been shown that favorable rearing conditions are beneficial for individuals throughout their lives. However, the long‐term consequences of rearing conditions on natal dispersal are still not fully understood in long‐lived birds. In this study, we aim to test the following hypotheses to address the relationship between rearing conditions and certain components of the natal dispersal process in Bonelli’s eagle (Aquila fasciata): (1) The body condition of nestlings depends on the quality of the territory and/or breeders; and (2) the survival until recruitment, (3) the age of recruitment, and (4) the natal dispersal distance (NDD) all depend on rearing conditions. As expected, nestlings reared in territories with high past productivity of chicks had better body condition, which indicates that both body condition and past productivity reflect the rearing conditions under which chicks are raised. In addition, chicks raised in territories with high past productivity and with good body condition had greater chances of surviving until recruitment. Furthermore, birds that have better condition recruit earlier, and males recruit at a younger age than females. At last, although females in good body condition exhibited higher NDD when they recruited at younger ages, this pattern was not observed in either older females or males. Overall, this study provides evidence that rearing conditions have important long‐term consequences in long‐lived birds. On the basis of our results, we advocate that conservation managers work actively in the promotion of actions aimed at improving the rearing conditions under which individuals develop in threatened populations.

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Simultaneous effects of age and territory quality on fecundity in Bonelli's EagleHieraaetus fasciatus

Cited by 71 publications

References 31 publications

Linking density, productivity and trends of an endangered species: The Bonelli's eagle in Spain

Linking density, productivity and trends of an endangered species: The Bonelli's eagle in Spain

Territory size ofFormicivora rufa(Wied, 1831) (Passeriformes, Thamnophilidae) in southeast Brazil

Effects of rearing conditions on natal dispersal processes in a long‐lived predator bird

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