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5 resultados encontrados para: AUTOR: Escobar Sarria, Federico
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1.
- Artículo con arbitraje
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Resumen en: Español | Inglés |
Resumen en español

En este estudio se explora la premisa de que una participación efectiva en conservación puede facilitarse cuando los miembros de las comunidades locales desarrollan capacidades para valorar sus acciones de manejo y ser capaces de evaluar diversas alternativas que promuevan la gestión y conservación de los recursos naturales. Para ello, presentamos información sobre la definición de temas de interés que participantes de dos comunidades en Calakmul, Campeche, acordaron para desarrollar actividades de investigación conjunta. Los temas que se generaron, a través de grupos focales y mapeo participativo, apuntaron a aspectos productivos, más que a aspectos directamente relacionados con la conservación, reflejando las necesidades y preocupaciones de los participantes. Se analizan los resultados de esta selección de temas como un diagnóstico que permite interpretar la realidad local según la perspectiva de sus habitantes e identificar aspectos clave implícitos en la conservación. Se hace énfasis en la importancia del trabajo en colaboración entre academia y sociedad civil para contribuir a incrementar capacidades locales que se requieren para la gestión del territorio en el mediano y largo plazo. De igual forma se analizan los retos que este marco de trabajo presenta.

Resumen en inglés

This study explores the premise that effective participation in conservation can be facilitated when local community members develop the capacity to assess their management actions and evaluate various alternatives that promote natural resource management and conservation. To this end, we present information on the definition of the topics of interest that participants from two communities in Calakmul, Campeche agreed on to undertake joint research activities. The issues generated, through focus groups and participatory mapping, pointed to productive aspects, rather than those directly related to conservation, reflecting the needs and concerns of participants. The results of this selection of topics were analyzed as a diagnosis that makes it possible to interpret the local reality according from the perspective of its inhabitants and to identify key aspects implicit in conservation. Emphasis is placed on the importance of collaborative work between academia and civil society in contributing to increasing the local capacities required for the management of the region in the medium and long term. The challenges of this framework are also analyzed.


Resumen en: Inglés |
Resumen en inglés

Quantifying biodiversity patterns in the context of human-caused environmental degradation is a fundamental task to improve conservation strategies; yet, it can be difficult given the rapid increase of available analytical methods. To guide studies on the topic, in this brief essay we present four approaches, accompanied by empirical examples, that can be used to accurately assess the impact of human activities on different facets of biological diversity. Such approaches include: (1) measurement of alpha diversity by incorporating interpolation-extrapolation techniques, Hill numbers and rank-abundance graphs; (2) beta diversity and its components of turnover and richness differences due to nestedness; (3) functional diversity, and (4) phylogenetic diversity. We highlight that a critical assessment, understanding and appropriate application of these and other emerging concepts and methods to assess biodiversity is needed to support both theoretical and applied studies, especially in biological conservation.


3.
- Artículo con arbitraje
Negative impacts of human land use on dung beetle functional diversity
Barragán Torres, Felipe ; Moreno Ortega, Claudia Elizabeth (coaut.) ; Escobar Sarria, Federico (coaut.) ; Halffter Salas, Gonzalo (coaut.) ; Navarrete Gutiérrez, Darío Alejandro (coaut.) ;
Contenido en: PLoS ONE Vol. 6, no. 3, e17976 (2011), p, 1-8 ISSN: 1932-6203
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Resumen en: Inglés |
Resumen en inglés

The loss of biodiversity caused by human activity is assumed to alter ecosystem functioning. However our understanding of the magnitude of the effect of these changes on functional diversity and their impact on the dynamics of ecological processes is still limited. We analyzed the functional diversity of copro-necrophagous beetles under different conditions of land use in three Mexican biosphere reserves. In Montes Azules pastures, forest fragments and continuous rainforest were analyzed, in Los Tuxtlas rainforest fragments of different sizes were analyzed and in Barranca de Metztitlán two types of xerophile scrub with different degrees of disturbance from grazing were analyzed. We assigned dung beetle species to functional groups based on food relocation, beetle size, daily activity period and food preferences, and as measures of functional diversity we used estimates based on multivariate methods. In Montes Azules functional richness was lower in the pastures than in continuous rainforest and rainforest fragments, but fragments and continuous forest include functionally redundant species. In small rainforest fragments (<5 ha) in Los Tuxtlas, dung beetle functional richness was lower than in large rainforest fragments (>20 ha). Functional evenness and functional dispersion did not vary among habitat types or fragment size in these reserves. In contrast, in Metztitlán, functional richness and functional dispersion were different among the vegetation types, but differences were not related to the degree of disturbance by grazing. More redundant species were found in submontane than in crassicaule scrub.

For the first time, a decrease in the functional diversity in communities of copro-necrophagous beetles resulting from changes in land use is documented, the potential implications for ecosystem functioning are discussed and a series of variables that could improve the evaluation of functional diversity for this biological group is proposed.


4.
Artículo
*En hemeroteca, SIBE-Campeche
Temporal shifts in dung beetle community structure within a protected area of tropical wet forest: a 35-year study and its implications for long-term conservation
Escobar Sarria, Federico ; Halffter Salas, Gonzalo (coaut.) ; Solís, Ángel (coaut.) ; Halffter, Violeta (coaut.) ; Navarrete Gutiérrez, Darío Alejandro (coaut.) ;
Contenido en: Journal of Applied Ecology Vol. 45, no. 6 (2008), p. 1584–1592 ISSN: 0021-8901
Bibliotecas: Campeche
Cerrar
SIBE Campeche
32661-10 (Disponible)
Disponibles para prestamo: 1
Nota: En hemeroteca, SIBE-Campeche
Resumen en: Inglés |
Resumen en inglés

1. Throughout much of the tropics, habitat loss is increasing and intensifying on the unprotected land surrounding conservation areas. The influence of these land-use changes on biodiversity is poorly understood. This study used data on dung beetles, a taxonomic group widely acknowledged to be an effective ecological indicator of anthropogenic disturbance, to evaluate temporal changes in diversity inside a natural protected area. 2. Using data from quantitative sampling events over the last 35 years along with an exhaustive review of the information available in museums and the literature, we present evidence suggesting that the dung beetles community structure has shifted dramatically over time at La Selva Biological Station, Costa Rica. 3. To date, 50 dung beetle species have been reported from La Selva. Of these, 10 (20%) were consistently collected within the study timeframe while 21 species (42%) were uncommon. Our results indicate a tendency toward decreasing species richness and changes in species composition over time. 4. Analysis of the community structure revealed a decrease in diversity (H ′ ), an increase in dominance (D) and a decrease in evenness (J) over the 35-year period; all of which can be linked to an increase in the dominance of one species ( Onthophagus acuminatus ). These changes were also reflected in the proportional abundance of major species guilds.

5. Synthesis and applications . Despite the relatively low human impact within La Selva, this study suggests that the dung beetle community has changed as result of habitat loss in the surrounding landscape and the progressive increasing isolation of the reserve over the last 35 years. Our findings, together with studies of other biota in the reserve, indicate a worrying decline in the conservation value of La Selva in recent decades. This shift in the diversity and composition of native forest biota needs to be taken into account in future studies that continue to rely on La Selva as providing an intact baseline for comparative research. More importantly, we suggest that the size of the reserve may need to be increased if its ecological integrity is to be restored. This study provides further evidence that isolated protected areas may often fail to safeguard biodiversity in the long term, and that to be viable, conservation strategies urgently need to adopt a wider landscape perspective.


5.
Artículo
*En hemeroteca, SIBE-San Cristóbal
Frog, bat, and dung beetle diversity in the cloud forest and coffee agroecosystems of Veracruz, Mexico
Pineda, Eduardo ; Moreno Ortega, Claudia Elizabeth (coaut.) ; Escobar Sarria, Federico (coaut.) ; Halffter Salas, Gonzalo (coaut.) ;
Contenido en: Conservation Biology Vol. 19, no. 2 (april 2005), p. 400-410 ISSN: 1987-2001
Bibliotecas: San Cristóbal
Cerrar
SIBE San Cristóbal
B4982 (Disponible)
Disponibles para prestamo: 1
Nota: En hemeroteca, SIBE-San Cristóbal