This page has only limited features, please log in for full access.

Unclaimed
José María Gil-Sánchez
Escuela de Ciencias Biológicas, Facultad de Ciencias Exactas y Naturales, Pontificia Universidad Católica del Ecuador, Quito, Ecuador

Basic Info

Basic Info is private.

Honors and Awards

The user has no records in this section


Career Timeline

The user has no records in this section.


Short Biography

The user biography is not available.
Following
Followers
Co Authors
The list of users this user is following is empty.
Following: 0 users

Feed

Original article
Published: 09 July 2021 in Mammalian Biology
Reads 0
Downloads 0

Human activities are changing ecosystems and their trophic structures across the globe and tropical forests are one of the main affected. Large carnivores can have a key role in the maintenance of biodiversity through direct and indirect effects at lower trophic levels, which are the result of predation and competition. In this sense, it is expected that changes in abundance of large predators driven by humans will affect the abundance of smaller carnivores. We explore the effects of varying degree of human intervention on the structure of a felid community of five sympatric species in Ecuador’s Amazon region. We used camera traps to survey carnivore populations in seven different areas between 2007 and 2016 and estimated density with spatial explicit capture–recapture models. The density of margays, jaguarundis, ocelots and jaguars showed a positive relationship with the conservation status of study sites, while no significant relationship was observed for pumas. We found that the anthropogenic impacts had asymmetric effects on the density of the different taxa. Jaguar and margays, the species with more stringent ecological requirements, presented higher reductions on density. Our findings support of the mesopredator release hypothesis in this tropical ecosystem. Maximum densities of pumas were detected in areas of low jaguar density, while there was a negative relationship between density of pumas and margays, jaguarundis, and ocelots. Our results show how human disturbance can have important ecological effects on the carnivore community. As felids are top predators, we can predict that changes in this trophic level can lead to changes in ecosystem function and structure. Therefore, conservation efforts should be addressed to maintain the structure of these communities.

ACS Style

José María Gil-Sánchez; José Jiménez; Julia Salvador; Mariola Sánchez-Cerdá; Santiago Espinosa. Structure and inter-specific relationships of a felid community of the upper Amazonian basin under different scenarios of human impact. Mammalian Biology 2021, 1 -14.

AMA Style

José María Gil-Sánchez, José Jiménez, Julia Salvador, Mariola Sánchez-Cerdá, Santiago Espinosa. Structure and inter-specific relationships of a felid community of the upper Amazonian basin under different scenarios of human impact. Mammalian Biology. 2021; ():1-14.

Chicago/Turabian Style

José María Gil-Sánchez; José Jiménez; Julia Salvador; Mariola Sánchez-Cerdá; Santiago Espinosa. 2021. "Structure and inter-specific relationships of a felid community of the upper Amazonian basin under different scenarios of human impact." Mammalian Biology , no. : 1-14.

Journal article
Published: 29 January 2021 in International Journal of Environmental Research and Public Health
Reads 0
Downloads 0

Intentional poisoning is a global wildlife problem and an overlooked risk factor for public health. Managing poisoning requires unbiased and high-quality data through wildlife monitoring protocols, which are largely lacking. We herein evaluated the biases associated with current monitoring programmes of wildlife poisoning in Spain. We compared the national poisoning database for the 1990–2015 period with information obtained from a field experiment during which we used camera-traps to detect the species that consumed non-poisoned baits. Our findings suggest that the detection rate of poisoned animals is species-dependent: Several animal groups (e.g., domestic mammalian carnivores and vultures) tended to be over-represented in the poisoning national database, while others (e.g., corvids and small mammals) were underrepresented. As revealed by the GLMM analyses, the probability of a given species being overrepresented was higher for heaviest, aerial, and cryptic species. In conclusion, we found that monitoring poisoned fauna based on heterogeneous sources may produce important biases in detection rates; thus, such information should be used with caution by managers and policy-makers. Our findings may guide to future search efforts aimed to reach a more comprehensive understanding of the intentional wildlife poisoning problem.

ACS Style

José Gil-Sánchez; Natividad Aguilera-Alcalá; Marcos Moleón; Esther Sebastián-González; Antoni Margalida; Zebensui Morales-Reyes; Carlos Durá-Alemañ; Pilar Oliva-Vidal; Juan Pérez-García; José Sánchez-Zapata. Biases in the Detection of Intentionally Poisoned Animals: Public Health and Conservation Implications from a Field Experiment. International Journal of Environmental Research and Public Health 2021, 18, 1201 .

AMA Style

José Gil-Sánchez, Natividad Aguilera-Alcalá, Marcos Moleón, Esther Sebastián-González, Antoni Margalida, Zebensui Morales-Reyes, Carlos Durá-Alemañ, Pilar Oliva-Vidal, Juan Pérez-García, José Sánchez-Zapata. Biases in the Detection of Intentionally Poisoned Animals: Public Health and Conservation Implications from a Field Experiment. International Journal of Environmental Research and Public Health. 2021; 18 (3):1201.

Chicago/Turabian Style

José Gil-Sánchez; Natividad Aguilera-Alcalá; Marcos Moleón; Esther Sebastián-González; Antoni Margalida; Zebensui Morales-Reyes; Carlos Durá-Alemañ; Pilar Oliva-Vidal; Juan Pérez-García; José Sánchez-Zapata. 2021. "Biases in the Detection of Intentionally Poisoned Animals: Public Health and Conservation Implications from a Field Experiment." International Journal of Environmental Research and Public Health 18, no. 3: 1201.

Research
Published: 18 August 2020 in Oikos
Reads 0
Downloads 0

The study of the competitive interactions between predators has traditionally been approached within the context of predatory behavior. By using a quasi‐experimental, non‐intrusive approach, we go beyond the classical view that predators only compete for living prey and disentangle the mechanisms of exploitative and interference competition between two charismatic apex predators, lions (Panthera leo) and spotted hyaenas (Crocuta crocuta), at carcasses other than their own kills. Carcasses of different sizes were monitored in two study areas of South Africa: one with both lions and hyaenas and the other with hyaenas only. We found evidence of both symmetric exploitative competition and asymmetric interference competition. Interactions were strongly conditioned by carcass size, and co‐occurrence was mostly recorded at large ungulate carcasses. Interference competition seemed to dominate interspecific interactions, with lions having preferential access. However, interference while feeding did not exert any cost on the subordinate hyaenas, in terms of amount of ingested food and consumption rate, probably thanks to the reward provided by large carcasses in the form of abundant carrion, the use of lions to detect carcasses, and spatiotemporal segregation at the carcass‐scale. Securing a diverse carrion supply in terms of carcass size, including megaherbivore carcasses, may favor the coexistence of the largest African carnivores, especially in small protected areas. Overall, our study reveals mechanisms related to both the food resource characteristics and the competitor behavior that allow the coexistence of strongly interacting species. This article is protected by copyright. All rights reserved.

ACS Style

Mar Amorós; José M. Gil‐Sánchez; Beatriz De Las N. López‐Pastor; Marcos Moleón. Hyaenas and lions: how the largest African carnivores interact at carcasses. Oikos 2020, 129, 1820 -1832.

AMA Style

Mar Amorós, José M. Gil‐Sánchez, Beatriz De Las N. López‐Pastor, Marcos Moleón. Hyaenas and lions: how the largest African carnivores interact at carcasses. Oikos. 2020; 129 (12):1820-1832.

Chicago/Turabian Style

Mar Amorós; José M. Gil‐Sánchez; Beatriz De Las N. López‐Pastor; Marcos Moleón. 2020. "Hyaenas and lions: how the largest African carnivores interact at carcasses." Oikos 129, no. 12: 1820-1832.

Original article
Published: 13 August 2020 in European Journal of Wildlife Research
Reads 0
Downloads 0

Cryptic mammals with semi-aquatic habits, like otters, are notoriously difficult to study. Elusive behaviour, low population density, nocturnal habits and the type of continental habitat that characterize this group of species make the estimation of their population density an arduous task. Passive infrared-triggered camera devices are a non-invasive methodology that may present key advantages for the study of otter density. We have evaluated its use for the detection and estimation of the density of the Eurasian otter (Lutra lutra) in seasonal intermittent Mediterranean rivers, where the presence of dry riverbed sections between pools is usual, due to the discontinuity of flow during the summer drought. Through six camera-trapping surveys carried out in the Yeguas River (South Spain), we evaluated the efficiency of camera-trapping in different scenarios of methodological design, including a comparison with the visual census method. The results indicated that camera-trapping can be an optimal method to estimate otter abundance if some conditions are achieved, being the most important to use camera devices with fast trigger speed (0.1–0.2 s), deployed in key places over the river bed. In the case of our best-designed surveys, related to effort and efficiency of camera devices, we found that detection probability could reach asymptotic values in a relatively short time of 1 week, with negligible effects of imperfect detection. Considering the robustness of the collected data from camera-trapping (larger sample size and sampling periods), the density estimation from camera trap method (0.43 otters/km and day) was more accurate than estimation from visual census (0.12 otters/km and day). Camera traps can provide valuable information not only for population size and trends but also for other key demographic parameters, such as sex-ratio and reproduction and activity rhythms.

ACS Style

Jose María Gil-Sánchez; Ezequiel Antorán-Pilar. Camera-trapping for abundance estimation of otters in seasonal rivers: a field evaluation. European Journal of Wildlife Research 2020, 66, 1 -8.

AMA Style

Jose María Gil-Sánchez, Ezequiel Antorán-Pilar. Camera-trapping for abundance estimation of otters in seasonal rivers: a field evaluation. European Journal of Wildlife Research. 2020; 66 (5):1-8.

Chicago/Turabian Style

Jose María Gil-Sánchez; Ezequiel Antorán-Pilar. 2020. "Camera-trapping for abundance estimation of otters in seasonal rivers: a field evaluation." European Journal of Wildlife Research 66, no. 5: 1-8.

Publisher correction
Published: 29 July 2020 in Scientific Reports
Reads 0
Downloads 0

An amendment to this paper has been published and can be accessed via a link at the top of the paper.

ACS Style

F. Javier Herrera-Sánchez; Jose María Gil-Sánchez; Begoña Álvarez; Inmaculada Cancio; Jesus De Lucas; Ángel Arredondo; Miguel Ángel Díaz-Portero; Javier Rodríguez-Siles; Juan Manuel Sáez; Joaquín Pérez; Emil McCain; Abdeljebbar Qninba; Teresa Abáigar. Publisher Correction: Identifying priority conservation areas in a Saharan environment by highlighting the endangered Cuvier’s Gazelle as a flagship species. Scientific Reports 2020, 10, 1 -1.

AMA Style

F. Javier Herrera-Sánchez, Jose María Gil-Sánchez, Begoña Álvarez, Inmaculada Cancio, Jesus De Lucas, Ángel Arredondo, Miguel Ángel Díaz-Portero, Javier Rodríguez-Siles, Juan Manuel Sáez, Joaquín Pérez, Emil McCain, Abdeljebbar Qninba, Teresa Abáigar. Publisher Correction: Identifying priority conservation areas in a Saharan environment by highlighting the endangered Cuvier’s Gazelle as a flagship species. Scientific Reports. 2020; 10 (1):1-1.

Chicago/Turabian Style

F. Javier Herrera-Sánchez; Jose María Gil-Sánchez; Begoña Álvarez; Inmaculada Cancio; Jesus De Lucas; Ángel Arredondo; Miguel Ángel Díaz-Portero; Javier Rodríguez-Siles; Juan Manuel Sáez; Joaquín Pérez; Emil McCain; Abdeljebbar Qninba; Teresa Abáigar. 2020. "Publisher Correction: Identifying priority conservation areas in a Saharan environment by highlighting the endangered Cuvier’s Gazelle as a flagship species." Scientific Reports 10, no. 1: 1-1.

Journal article
Published: 19 May 2020 in Scientific Reports
Reads 0
Downloads 0

Monitoring populations and designing effective conservation actions for endangered species present significant challenges. An accurate understanding of current distribution, ecological traits and habitat requirements is imperative in formulating conservation strategies. Recent surveys on the southernmost Cuvier’s Gazelle (Gazella cuvieri) population, an ungulate endemic to North Africa, showcase its importance in terms of numbers and genetic diversity. This population inhabits a remote region in the extreme north-western portion of the Sahara Desert and has not been well studied. Here, we examine the potential distribution of Cuvier’s Gazelle and the environmental factors limiting the species in a Saharan environment, by combining broad-scale field survey data and species distribution models. Our objective was to identify high priority conservation areas in the southernmost known portion of the species’ distribution by modelling habitat selection at the landscape scale using a predictive distribution map. Our results show that the distribution of Cuvier’s Gazelle is strongly related to mountainous areas with heterogeneous terrain and remoteness from large human settlements over other ecological factors that had less impact on the species’ presence and distribution. We also provide a quantitative estimate of the potential distribution range of Cuvier’s Gazelle in southern Morocco, identifying two well-demarcated key areas. The two core areas currently contain enough rugged terrain isolated from human encroachment to support the endangered species in this harsh desert environment. We encourage the implementation of conservation planning for Cuvier’s Gazelle as an “umbrella species”, which will confer effective protection to higher-quality habitat zones and co-occurring species, leading to sustainable and ecologically responsible development in the region.

ACS Style

F. Javier Herrera-Sánchez; Jose María Gil-Sánchez; Begoña Álvarez; Inmaculada Cancio; Jesus De Lucas; Ángel Arredondo; Miguel Ángel Díaz-Portero; Javier Rodríguez-Siles; Juan Manuel Sáez; Joaquín Pérez; Emil McCain; Abdeljebbar Qninba; Teresa Abáigar. Identifying priority conservation areas in a Saharan environment by highlighting the endangered Cuvier’s Gazelle as a flagship species. Scientific Reports 2020, 10, 1 -10.

AMA Style

F. Javier Herrera-Sánchez, Jose María Gil-Sánchez, Begoña Álvarez, Inmaculada Cancio, Jesus De Lucas, Ángel Arredondo, Miguel Ángel Díaz-Portero, Javier Rodríguez-Siles, Juan Manuel Sáez, Joaquín Pérez, Emil McCain, Abdeljebbar Qninba, Teresa Abáigar. Identifying priority conservation areas in a Saharan environment by highlighting the endangered Cuvier’s Gazelle as a flagship species. Scientific Reports. 2020; 10 (1):1-10.

Chicago/Turabian Style

F. Javier Herrera-Sánchez; Jose María Gil-Sánchez; Begoña Álvarez; Inmaculada Cancio; Jesus De Lucas; Ángel Arredondo; Miguel Ángel Díaz-Portero; Javier Rodríguez-Siles; Juan Manuel Sáez; Joaquín Pérez; Emil McCain; Abdeljebbar Qninba; Teresa Abáigar. 2020. "Identifying priority conservation areas in a Saharan environment by highlighting the endangered Cuvier’s Gazelle as a flagship species." Scientific Reports 10, no. 1: 1-10.

Research article
Published: 28 January 2020 in PLoS ONE
Reads 0
Downloads 0

Knowledge of population dynamics of threatened species in the wild is key to effective conservation actions. However, at present, there are many examples of endangered animals for which their current situation is unknown, and not just in remote areas and less developed countries. We have explored this topic by studying the paradigmatic case of the European wildcat (Felis silvestris silvestris), an endangered small carnivore whose status has been subjectively established on the basis of non-systematic approaches and opportunistic records. Little is known about its demographic situation, prompting the need for information to improve conservation measures. However, the secretive behaviour of felines along with its low density in natural conditions have prevented the gathering of sufficient data. We developed a field sampling strategy for one of the largest populations (Andalusia, South Spain, 87,268 km2), based on a logistically viable systematic non-intrusive survey by camera-trapping. This study offers the first large-scale estimation for any European wildcat population, based on analytical approaches applied on Species Distribution Models. A hierarchical approach based on a Maxent model for distribution estimation was used, along with Generalised Linear Models for density estimation from explicit spatial capture-recapture data. Our results show that the distribution range is smaller and more highly fragmented than previously assumed. The overall estimated density was very low (0.069 ±0.0019 wildcats/km2) and the protected areas network seems to be insufficient to cover a significant part of the population or a viable nucleus in demographic terms. Indeed, the most important areas remain unprotected. Our main recommendations are to improve the protected area network and/or vigilance programs in hunting estates, in addition to studying and improving connectivity between the main population patches.

ACS Style

Jose María Gil-Sánchez; Jose Miguel Barea-Azcón; Javier Jaramillo; Francisco Javier Herrera Sánchez; Jose Jimenez; Emilio Virgós. Fragmentation and low density as major conservation challenges for the southernmost populations of the European wildcat. PLoS ONE 2020, 15, e0227708 .

AMA Style

Jose María Gil-Sánchez, Jose Miguel Barea-Azcón, Javier Jaramillo, Francisco Javier Herrera Sánchez, Jose Jimenez, Emilio Virgós. Fragmentation and low density as major conservation challenges for the southernmost populations of the European wildcat. PLoS ONE. 2020; 15 (1):e0227708.

Chicago/Turabian Style

Jose María Gil-Sánchez; Jose Miguel Barea-Azcón; Javier Jaramillo; Francisco Javier Herrera Sánchez; Jose Jimenez; Emilio Virgós. 2020. "Fragmentation and low density as major conservation challenges for the southernmost populations of the European wildcat." PLoS ONE 15, no. 1: e0227708.

Journal article
Published: 11 December 2018 in Galemys, Spanish Journal of Mammalogy
Reads 0
Downloads 0

Palabras clave: Felis margarita, Gazella cuvieri, Mamíferos desconocidos, Mellivora capensis, Sahara occidentalDOI: 10.7325/Galemys.2018.F2

ACS Style

José María Gil-Sánchez. La crisis de la investigación mastozoológica en regiones remotas. Galemys, Spanish Journal of Mammalogy 2018, 30, 5 -7.

AMA Style

José María Gil-Sánchez. La crisis de la investigación mastozoológica en regiones remotas. Galemys, Spanish Journal of Mammalogy. 2018; 30 ():5-7.

Chicago/Turabian Style

José María Gil-Sánchez. 2018. "La crisis de la investigación mastozoológica en regiones remotas." Galemys, Spanish Journal of Mammalogy 30, no. : 5-7.

Journal article
Published: 01 December 2015 in Zoology
Reads 0
Downloads 0

The European wildcat (Felis silvestris silvestris) is an endangered felid impacted by genetic introgression with the domestic cat (Felis silvestris catus). The problem of hybridization has had different effects in different areas. In non-Mediterranean regions pure forms of wildcats became almost extinct, while in Mediterranean regions genetic introgression is a rare phenomenon. The study of the potential factors that prevent the gene flow in areas of lower hybridization may be key to wildcat conservation. We studied the population size and spatial segregation of wildcats and domestic cats in a typical Mediterranean area of ancient sympatry, where no evidence of hybridization had been detected by genetic studies. Camera trapping of wild-living cats and walking surveys of stray cats in villages were used for capture-recapture estimations of abundance and spatial segregation. Results showed (i) a low density of wildcats and no apparent presence of putative hybrids; (ii) a very low abundance of feral cats in spite of the widespread and large population sources of domestic cats inhabiting villages; (iii) strong spatial segregation between wildcats and domestic/feral cats; and (iv) no relationship between the size of the potential population sources and the abundance of feral cats. Hence, domestic cats were limited in their ability to become integrated into the local habitat of wildcats. Ecological barriers (habitat preferences, food limitations, intra-specific and intra-guild competition, predation) may explain the severe divergences of hybridization impact observed at a biogeographic level. This has a direct effect on key conservation strategies for wildcats (i.e., control of domestic cats).

ACS Style

J.M. Gil-Sánchez; J. Jaramillo; J.M. Barea-Azcón. Strong spatial segregation between wildcats and domestic cats may explain low hybridization rates on the Iberian Peninsula. Zoology 2015, 118, 377 -385.

AMA Style

J.M. Gil-Sánchez, J. Jaramillo, J.M. Barea-Azcón. Strong spatial segregation between wildcats and domestic cats may explain low hybridization rates on the Iberian Peninsula. Zoology. 2015; 118 (6):377-385.

Chicago/Turabian Style

J.M. Gil-Sánchez; J. Jaramillo; J.M. Barea-Azcón. 2015. "Strong spatial segregation between wildcats and domestic cats may explain low hybridization rates on the Iberian Peninsula." Zoology 118, no. 6: 377-385.

Journal article
Published: 15 April 2011 in European Journal of Wildlife Research
Reads 0
Downloads 0

The use of non-invasive long-term monitoring data to estimate home ranges of the critically endangered Iberian lynx has been evaluated. This programme began in 2002 and consisting of both annual latrine and camera-trap surveys, with the aims of detecting and individually identifying the maximum number of individuals and delineating female home range boundaries. Radio-tracking data were used to evaluate the accuracy of home range estimates constructed with camera-trapping data. There was little overlap of camera-trapping home ranges (7.0% ± 1.47), which suggests the existence of real territories consistent with the land tenure system expected for the species. Camera trapping home range estimates were half the size of radio-tracking data (54.1% ± 6.0 of overlapping). When comparing core areas, only the radio-tracking data did not yield improved results (36.7 ± 5.4 of overlapping). Estimation of territories, which escaped detection each year, ranged from 0.0% to 5.7%. The results produced by camera-trapping data in this non-intrusive monitoring programme could be considered precise, and are therefore well suited to provide the knowledge required for appropriate conservation of this endangered species.

ACS Style

Jose María Gil-Sánchez; Manuel Moral; José Bueno; Javier Rodríguez-Siles; Santiago Lillo; Joaquín Pérez; Jose Manuel Martín; Gerardo Valenzuela; Germán Garrote; Bernado Torralba; Miguel Ángel Simón-Mata. The use of camera trapping for estimating Iberian lynx (Lynx pardinus) home ranges. European Journal of Wildlife Research 2011, 57, 1203 -1211.

AMA Style

Jose María Gil-Sánchez, Manuel Moral, José Bueno, Javier Rodríguez-Siles, Santiago Lillo, Joaquín Pérez, Jose Manuel Martín, Gerardo Valenzuela, Germán Garrote, Bernado Torralba, Miguel Ángel Simón-Mata. The use of camera trapping for estimating Iberian lynx (Lynx pardinus) home ranges. European Journal of Wildlife Research. 2011; 57 (6):1203-1211.

Chicago/Turabian Style

Jose María Gil-Sánchez; Manuel Moral; José Bueno; Javier Rodríguez-Siles; Santiago Lillo; Joaquín Pérez; Jose Manuel Martín; Gerardo Valenzuela; Germán Garrote; Bernado Torralba; Miguel Ángel Simón-Mata. 2011. "The use of camera trapping for estimating Iberian lynx (Lynx pardinus) home ranges." European Journal of Wildlife Research 57, no. 6: 1203-1211.