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14/04/2014
Using spatially explicit predictive models, the effects of habitat features on the relative abundance of wild boar populations and how the abundance of boars is related to frequency of Iberian wolf (Canis lupus signatus) have been investigated in the area. Results showed that wild boar and wolf relative abundances are associated. According to previous knowledge, wild boar abundance is positively related to the percentage of surface occupied by mature forest and heather providing high food diversity and refuge, but these environmental variables achieved a low explanatory capacity in the models in relation to wolf frequency. The holistic approach followed in this study was attended to open new perspectives for thinking on the wolf-livestock conflict and to adequate wild boar management strategies taking into account hunting interests and natural processes. informacion[at]ebd.csic.es: Segura et al (2014) Biotic and abiotic factors modulating wild boar relative abundance in Atlantic Spain. Eur J Wildl Res. Doi 10.1007/s10344-014-0807-2
10/04/2014
Understanding how top predators respond to natural and anthropogenically induced changes in their environment is a major conservation challenge especially in marine environments. The mechanisms through which a typical central-place forager, the Magellanic penguin (Spheniscus magellanicus) have been explored at Argentina. This study has combined habitat and species distribution modeling with isotopic dietary reconstructions. The at-sea distribution of penguins was tightly coupled with the spatial distribution of their staple prey species, anchovies (Engraulis anchoita), especially in areas over the continental shelf, with relatively warm water, and moderate abundances of conspecifics. This multifactorial approach can be extended to a large suite of central-place foragers, thus providing important advances in the way we investigate how to effectively conserve and manage these species. informacion[at]ebd.csic.es: Ramírez et al (2014) Natural and anthropogenic factors affecting the feeding ecology of a top marine predator, the Magellanic penguin. Ecosphere 5: art38. Doi 10.1890/ES13-00297.1
07/04/2014
The movements of individuals at almost any scale are likely to depend on the behaviour of conspecifics. A general statistical framework is developed here for identifying and characterizing conspecific influence on movements from tracking data acquired simultaneously from a set of potentially interacting individuals. Conspecific attraction/repulsion is modelled through a functional response in which social behaviour is assumed to depend on proximity to other individuals. A Bayesian approach for the estimation of the model is presented here to illustrate its use with simulated movement data. The method is applied to a case study on eagle owl juvenile dispersal, demonstrating that individual movements are generally influenced by the presence of conspecifics, with the level of attraction decreasing with increasing proximity to other individuals. Results show that female eagle owls are more attracted to conspecifics than males, and both males and females are more attracted to females than to maless. informacion[at]ebd.csic.es: Delgado et al (2014) A statistical framework for inferring the influence of conspecifics on movement behaviour. Methods in Ecology and Evolution, 5:183-189. Doi 10.1111/2041-210X.12154
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    Estación Biólogica de Doñana - Consejo Superior de Investigaciones Científicas - Apdo 1056 E - 41013 Sevilla
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