Food predictability determines space use of endangered vultures: implications for management of supplementary feeding

López‐López, Pascual; García‐Ripollés, Clara; Urios, Vicente

doi:10.1890/13-2000.1

Cited by 88 publications

(80 citation statements)

References 57 publications

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“…This is especially the case for those populations that now depend on supplementary feeding stations. While foraging patterns of certain species appear to be unaltered by the availability of food at feeding stations [56–59], for other species, movements are clearly conditioned, either pushing individuals to take longer forays to feed on supplementary stations [60] or restrict food searching to those places [61]. The high abundance of alternative food sources and diet plasticity of certain populations (e.g.…”

Section: Resultsmentioning

confidence: 99%

A three-decade review of telemetry studies on vultures and condors

Alarcón

Lambertucci

2018

Mov Ecol

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Telemetry-based movement research has become central for learning about the behavior, ecology and conservation of wide-ranging species. Particularly, early telemetry studies were conducted on vultures and condors due to three main reasons: i) these birds capture the curiosity of humans, ii) their large body size allows researchers to deploy large telemetry units, and iii) they are of high conservation concern. This has resulted in a great number of scientific articles that remain scattered throughout the literature. To achieve a more cohesive view of vultures and condors movement behavior, we review all telemetry studies published up to 2017. We first present a descriptive summary of the technical and design characteristics of these studies (e.g. target species, tagging location, number of individuals tagged) and go on to discuss them under a common conceptual framework; the Movement Ecology Paradigm. The articles found (N = 97) were mainly published in the last decade and based on the tagging of individuals from 14 species (61% of the extant species) and 24 countries. Foraging was the most in-depth investigated movement phase (25 studies), with studies covering several species, using both phenomenological and mechanistic approaches and tackling the role of different drivers of movement. In contrast, commuting and natal dispersal phases were only superficially investigated (3 and 8 studies, respectively). Finally, studies dealing with the conservation and management also comprised a large portion of the reviewed articles (24 studies). Telemetry studies have revealed relevant details of vultures and condors movements, with highly accurate measurements of flight energetics and a better understanding of the morphological, physiological and context-dependent drivers that underlie the movement decisions of these birds. However, we also detected several information gaps. We expect this review helps researchers to focus their efforts and funds where more information is needed.Electronic supplementary materialThe online version of this article (10.1186/s40462-018-0133-5) contains supplementary material, which is available to authorized users.

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Section: Resultsmentioning

confidence: 99%

A three-decade review of telemetry studies on vultures and condors

Alarcón

Lambertucci

2018

Mov Ecol

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“…Using the same birds, the latter authors reported home range sizes (according to MCP) ranging from 45.42 km 2 to 142.66 km 2 (51.30-142.66 km 2 for males and from 45.42 to 134.84 km 2 for females) (Martínez et al 2011). These differences in home range size can be logically accounted for the different tracking methods, indicating that radiotracking tends to underestimate measures of home range size in comparison with unbiased GPS satellite tracking technologies (Girard et al 2002;e.g., García-Ripollés et al 2011;López-López et al 2014a). With regards to sex differences in ranging behaviour, previous studies suggested different levels of space use by males and females, with females tending to range across larger areas than males, particularly during the pre-laying and pre-migratory periods (Díaz-Ruiz and Cebollada-Baratas 2011).…”

Section: Discussionmentioning

confidence: 98%

“…Following similar studies focused on the analysis of spatio-temporal variations in home range behaviour of long-lived territorial raptors (e.g., Campioni et al 2013;López-López et al 2014a), we divided each breeding season into three periods: (1) a ''pre-laying'' period, which spanned from the arrival at breeding areas until egg laying; 2) a ''incubation ? nestling'' period, which comprised an average period of 39 days of incubation (García-Dios 2009) plus the period in which nestlings remained in the nest just before their first flights [52 days on average; García-Dios (2009)]; and finally, a (3) ''pre-migration'' period, including the dependence period of juveniles once fledged until the onset of autumn migration to their wintering grounds.…”

Section: Study Area and Bird Taggingmentioning

confidence: 99%

Spatial ecology and habitat use of adult Booted Eagles (Aquila pennata) during the breeding season: implications for conservation

et al. 2016

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Fast-moving technological advances, such as satellite tracking technologies, are providing in-depth information of aspects of avian ecology hitherto unknown. In fact, detailed information about movement ecology and ranging behaviour of birds is important not only from the perspective of the basic ecology, but also from the conservation point of view. This is particularly important in European countries where agricultural intensification, land abandonment and the withdrawal of traditional management agro-forestry practices pose a threat to biodiversity. The Booted Eagle, likewise other forest raptors, is an adequate bioindicator of human-dominated agro-forestry Mediterranean landscapes in which low-intensity traditional agricultural practices still persist. Here, using a combination of an unbiased technology (i.e., GPS telemetry), a wide geographic extension of marked birds (all over Spain), and much larger sample size than in previous works, we provide the first quantitative assessment of the home range size and space use of the Booted Eagle by means of GPS satellite telemetry during the breeding season. Interestingly, our results revealed different levels of space use over the breeding season and showed that eagles perform long distance foraging movements (i.e., [20 km) from the nest throughout the breeding season. This resulted in larger home ranges than reported thus far, and, more interestingly, in an extremely eccentric topology of territories. Hence, management measures for conservation of forest raptors based on setting restrictions around nesting sites using buffer areas of arbitrary radii clearly results in large areas of eagles' home ranges laying outside ''restriction'' areas. Therefore, conservation measures should take into account the full range of agro-forestry habitats encompassed within the home range. Finally, our results support the claim that a large-scale management approach beyond the establishment of a closed network of protected areas such as the Natura 2000 network is necessary for the conservation of Mediterranean raptors.

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“…However, ecologically important insect assemblages and other already vulnerable species may be exposed to such residues, with as yet unknown consequences (e.g., the Egyptian vulture, which is coprophagous [179][180] and rapidly declining in some parts of its range [181,182]. Residues of antiparasitic agents (e.g., endectocides like ivermectin) in the dung of livestock animals can be harmful to a number of coprophagous insects [183][184][185][186] that perform similar ecosystem services to vultures, but on a less obvious microscale.…”

Section: Analysis Of Fecal Mattermentioning

confidence: 99%

Merging Wildlife and Environmental Monitoring Approaches with Forensic Principles: Application of Unconventional and Non-Invasive Sampling in Eco- Pharmacovigilance

Richards¹

2014

J Forensic Res

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Pharmaceutical residues in the environment have the potential to harm wildlife. A population's fragility or an animal's secretive nature may preclude capture and the use of invasive/destructive sampling techniques that are typically used in a risk assessment. Conventionally favoured matrices gathered opportunistically from carcasses have a finite lifespan, thereby limiting the detection window. This multidisciplinary paper aims to promote the use of non-invasive approaches and optimize use of even the most degraded carcasses. We highlight a selection of promising alternative, unconventional and underutilized sample types that could be applied in environmental monitoring efforts and wildlife forensic investigations. With a focus on non-steroidal anti-inflammatory drugs (NSAIDs), now under increasing scrutiny in the freshwater and terrestrial environment, we first illustrate current sampling practices and gaps in knowledge by summarizing exposure of: 1) aquatic organisms to urban effluent discharged into waterways, and, 2) scavenging species to veterinary residues in livestock and other carrion. We then consider the merits and limitations of a range of alternative environmentally robust sample options that offer a broader detection interval for NSAIDs, with emphasis on hair, wool and feathers. The viability of eyes/ocular material, bone matter, fecal matter, injection sites, ingesta/pellets and scavenging/coprophagous insects are also discussed.

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Food predictability determines space use of endangered vultures: implications for management of supplementary feeding

Cited by 88 publications

References 57 publications

A three-decade review of telemetry studies on vultures and condors

A three-decade review of telemetry studies on vultures and condors

Spatial ecology and habitat use of adult Booted Eagles (Aquila pennata) during the breeding season: implications for conservation

Merging Wildlife and Environmental Monitoring Approaches with Forensic Principles: Application of Unconventional and Non-Invasive Sampling in Eco- Pharmacovigilance

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