Body size, energetic and foraging mode of raptors in central Chile

Bozinovic, Francisco; Medel, Rodrigo

doi:10.1007/bf00376951

Cited by 40 publications

(19 citation statements)

References 19 publications

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“…In other cases, as we observed in our results, consumption focuses mostly on adult individuals and is related to the daily energy requirements of the predator. According to Bozinovic and Medel (1988), larger prey in a single capture provide all or most of their daily energy requirements and thus will be more frequent in the diet while smaller prey will require more than a single catch. Thus, adult prey selection is more cost-effective.…”

Section: Discussionmentioning

confidence: 99%

Vulnerability of small and medium-sized prey mammals in relation to their habitat preferences, age classes and locomotion types in the temperate Monte Desert, Argentina

et al. 2012

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a b s t r a c tIn this study we examined predation by small felids upon small and medium-sized prey mammals in the central region of the Monte Desert. We analyzed the degree of vulnerability of prey mammals in relation to their habitat use patterns, modes of locomotion and age classes. Medium and small rodents were the predominant prey in the diet of small cats. The most consumed small mammal was Akodon molinae, which inhabits areas of dense cover, while species occurring in open habitats such as Eligmodontia typus were less consumed. Among medium-sized mammals, Galea leucoblephara that depends on patches with high plant cover for refuge was more consumed than Microcavia australis that lives in colonies and displays a complex set of antipredator strategies. Prey selectivity on small rodents showed that E. typus, which uses bipedal locomotion and an erratic escape behaviour, was consumed in greater proportion than its availability. We suggest that although its specialized locomotory mode would diminish predator attacks, its preference for open habitats would increase the probability of predator-prey encounter. Consumption of small mammals focuses mostly on adult individuals. However, we found a significant consumption of senile individuals of A. molinae, which points out that vulnerability tends to be high towards the age of maturity in this species.

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Section: Discussionmentioning

confidence: 99%

Vulnerability of small and medium-sized prey mammals in relation to their habitat preferences, age classes and locomotion types in the temperate Monte Desert, Argentina

et al. 2012

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“…Within these flocks, waterbird species are highly variable in size, abundance and spatial arrangement, which constitutes an appropriate scenario to assess possible factors influencing prey preferences by this wild small cat. If predator choices are contingent upon prey attributes, such as prey availability and energy constraints (Bozinovic and Medel 1988;Jaksic 1989), these prey attributes (abundance, size and distance of prey before attack) should affect predator choice. The aim of this study was to investigate if O. geoffroyi shows opportunistic behaviors by responding to seasonal changes in waterbird prey abundance or shows selective behaviors.…”

Section: Introductionmentioning

confidence: 99%

Selection of waterbirds by Geoffroy's cat: Effects of prey abundance, size, and distance

2007

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In spite of its wide distribution, Geoffroy's cat (Oncifelis geoffroyi) has been recently upgraded from Least Concern IUCN category to Near Threatened because of lack of knowledge. In this study, we examine at the Mar Chiquita Biosphere Reserve (371 46'S, 571 27'W; Argentina) their seasonal diet, and their feeding preference in relation to waterbird abundance, size, and distance of waterbird prey before attack. The diet, evaluated by feces analysis, was comprised of 42% waterbirds and 40% small mammals. The relative importance of waterbirds in the diet changed throughout the year associated with seasonal fluctuations in their availability. Predation on waterbirds increased from autumn to summer, while predation on small mammals decreased during this period. Trophic-niche breadth for prey occurrence was higher in autumn and lower in spring. We found that abundance, distance of waterbird prey before attack, and prey size were significant predictors of waterbird consumption by the Geoffroy's cat. This small cat appears to change its kill rate in relation to waterbird abundance changes. The overconsumption of prey close to vegetation and big prey indicates selective predatory behavior by this cat.

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“…Bozinovic & Medel (1988) analyzed the energetic requirements of this and other raptors, proposing that preys of the size of O. longicaudatus provide the best energetic return at minimal effort for the Barn owl. This reason may explain why Barn owl was preying mainly on O. longicaudatus, and this owl may prey on other items when the abundance of O. longicaudatus decreases below a threshold level despite the larger biomass of other preys such as Rattus spp.…”

Section: Resultsmentioning

confidence: 99%

Feeding habits and people’s perception of the Barn Owl ( Tyto alba tuidara , J.E.Gray 1829) in urban settings of Southern Chile: Implications for conservation

et al. 2017

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Feeding habits and people's perception of the Barn Owl (Tyto alba tuidara, J.E.Gray 1829) in urban settings of Southern Chile: Implications for conservationHábitos alimenticios y percepción de las personas hacia la Lechuza blanca (Tyto alba tuidara, J.E.Gray 1829) en un barrio urbano del sur de Chile: Implicancias para la conservación JAVIER ABSTRACTPeople's perception on birds of prey is heavily infl uenced by its intrinsic value, utility, myths and superstitions. In particular, negative perceptions may encourage poaching and persecution of these birds, affecting their conservation status. One nocturnal raptor species widely distributed across the world is the Barn Owl (Tyto alba, Tytonidae). In Chile, this species has been recorded and studied exclusively in rural and sub-urban areas. However, in the city of Valdivia Barn owls exist within the city boundaries. In this study we documented the feeding habits of Barn owls nesting in urban settings of Valdivia, and we analyze the opinions of local neighbors toward the owls. To characterize the diet of owls, we collected all pellets found around their nesting tree on a monthly basis between August 2010 and August 2011. We interviewed the neighbors using a questionnaire that included questions about the utility, ethical or aesthetic value of the owl and the tree where they nested. Our results indicate that the main prey of the Barn Owl was the Long-tailed Colilargo (Oligoryzomys longicaudatus). The neighbors' perception was favorable to the Barn Owl primarily for aesthetic and ethical reasons, and not utilitarian reasons. Our results suggest that people perception in urban areas is different than in rural areas, where previous studies showed the prevalence of utilitarian values. This positive perception represents a great potential to promote conservation and environmental education in the city, creating a link between people and the natural elements they have in their environment. KEYWORDS:Environmental education, Oligoryzomys longicaudatus, Raptors, urban ecology, urban wildlife. RESUMENLa percepción que tienen las personas frente a las rapaces está fuertemente infl uenciada por su valor intrínseco, por su utilidad, y por mitos y supersticiones. En particular, las percepciones negativas pueden fomentar la caza furtiva y la persecución de estas aves, afectando su estado de conservación. Una rapaz nocturna distribuida a nivel mundial es la lechuza blanca (Tyto alba, Tytonidae). En Chile, esta especie ha sido registrada y estudiada exclusivamente en zonas rurales y sub-urbanas. Sin embargo, en la ciudad de Valdivia existen lechuzas habitando dentro del perímetro urbano. En este trabajo documentamos la composición de especies de roedores consumidos por las lechuzas blancas dentro de un barrio urbano, y evaluamos la percepción de los vecinos sobre la presencia de lechuza blanca en su barrio. Para caracterizar la dieta de las lechuzas, recolectamos egagrópilas mensualmente entre agosto de 2010 y agosto de 2011. Para conocer la percepción de los vecinos, se elaboró un c...

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Body size, energetic and foraging mode of raptors in central Chile

Cited by 40 publications

References 19 publications

Vulnerability of small and medium-sized prey mammals in relation to their habitat preferences, age classes and locomotion types in the temperate Monte Desert, Argentina

Vulnerability of small and medium-sized prey mammals in relation to their habitat preferences, age classes and locomotion types in the temperate Monte Desert, Argentina

Selection of waterbirds by Geoffroy's cat: Effects of prey abundance, size, and distance

Feeding habits and people’s perception of the Barn Owl ( Tyto alba tuidara , J.E.Gray 1829) in urban settings of Southern Chile: Implications for conservation

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Body size, energetic and foraging mode of raptors in central Chile

Cited by 40 publications

References 19 publications

Vulnerability of small and medium-sized prey mammals in relation to their habitat preferences, age classes and locomotion types in the temperate Monte Desert, Argentina

Vulnerability of small and medium-sized prey mammals in relation to their habitat preferences, age classes and locomotion types in the temperate Monte Desert, Argentina

Selection of waterbirds by Geoffroy's cat: Effects of prey abundance, size, and distance

Feeding habits and people&#8217;s perception of the Barn Owl ( Tyto alba tuidara , J.E.Gray 1829) in urban settings of Southern Chile: Implications for conservation

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Feeding habits and people’s perception of the Barn Owl ( Tyto alba tuidara , J.E.Gray 1829) in urban settings of Southern Chile: Implications for conservation