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• W203437074 abstract "espanolLas poblaciones de jabali estan en aumento en toda la Espana peninsular incluso en areas no sujetas a manejos cinegeticos intensivos. El aumento excesivo de sus poblaciones tiene efectos negativos sobre el ecosistema, razon por la que es necesario contar con metodos fiables para estimar la abundancia de las poblaciones y sus tendencias a lo largo del tiempo. Los datos derivados de las actividades cinegeticas han sido utilizados en otras ocasiones para este proposito, sin embargo esta informacion no debe ser usada en bruto ya que depende del numero de animales cazados y este es un dato a su vez determinado por numerosos factores entre los que cabe destacar la eficacia de los cazadores a la hora de abatir los animales. Con informacion de 4 temporadas de caza (de 1998-1999 a 2001-2002) registrada para 44 territorios cinegeticos del Principado de Asturias se ha calculado la eficacia de caza (proporcion de animales que se cazan del total de animales vistos en una caceria). Dicha eficacia ha sido considerada para estimar un indice de abundancia poblacional de jabali usando el metodo desarrollado por De Lury. Ambos indices, eficacia y abundancia, han sido relacionados con variables ambientales (estructura del paisaje, topografia, estructuras humanas y presion cinegetica) por medio de modelos lineales generales. Los resultados han mostrado que tanto variables relacionadas con la visibilidad, como por ejemplo la abundancia de helechales y la diversidad paisajistica, como otras relacionadas con la disponibilidad de lugares de encame, determinan la eficacia de las cacerias. Por otro lado, la abundancia de las poblaciones de jabali se encuentra principalmente determinada por variables relacionadas con la disponibilidad de alimento. Por tanto, y al estar la eficacia de caza determinada por parametros ambientales independientes del tamano de las poblaciones de jabali, se considera que esta debe ser tenida en cuenta a la hora de usar los resultados de las actividades cinegeticas como indicadores de abundancia. EnglishWild boar populations have increased over the species' entire Spanish range even in areas with no direct influence of humans (like artificial feeding, watering, etc.). Some detrimental effects were raised in relation with the wild boar increase, which justifies the development and improvement of methods to estimate wild boar abundance and population trends. Harvesting information is important for planning the extraction policy and managements goals, mainly for elusive species as wild boar. Nevertheless this information could be biased by several factors, being hunting effectiveness one of them. Thus, our objective was to investigate how landscape structure affects wild boar abundance and hunting effectiveness. Based on data of 44 game territories for 4 seasons (from 1998-1999 to 2001-2002), we quantified hunting effectiveness as the proportion of animals caught in relation to the total seen by hunters. Then, we estimated a corrected wild boar abundance index following the De Lury' method. Twenty two factors related with landscape structure, topography, human infrastructures, and hunting pressure, were considered to study their effects on wild boar abundance and hunting effectiveness by means of General Linear Models (GLM). Landscape structure factors that possibly resembled increased visibility (abundance of fern and landscape diversity index) and availability of wild boar resting places (percentage with south-west orientation) statistically associated with effectiveness. Factors related food availability (abundance of pre-forest but also landscape diversity index) statistically and positively associated with wild boar abundance. We suggest that corrected wild boar abundances should be considered in monitoring schemes to obtain more suitable wild boar abundance estimates. The applicability ofhunting effectiveness data in catch-effort methodologies is discussed." @default.
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• W203437074 date "2009-01-01" @default.
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• W203437074 title "WILD BOAR ABUNDANCE AND HUNTING EFFECTIVENESS IN ATLANTIC SPAIN: ENVIRONMENTAL CONSTRAINTS" @default.
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