A Specie's Vulnerability to Population Decline

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Policy- and decision-makers claim information about the causes of population declines which driving species on the brink of extinction (). However, it is pointed out that the causes of vulnerability remain unclear to explain the variation to the risk of extinction (). According to Reynolds (2003), vulnerability is determinate by both the decline of species population and the reduction of their geographical range. These two forms of vulnerability are affected by both species’ mortality and habitat loss, which are the causes of intrinsic biological traits, extrinsic human induced effects and stochastic factors that likely determine the population trends (). It is suggested that extinction risk is not distributed by chance between taxa, because closely related species could share intrinsic biological traits which make them more vulnerable to extinction (Bennett & Owen 1997, Gaston & Blackburn 1997, Freckleton et al. 2002). This scenario is used to understand why some species are more vulnerable to extinction than others using several intrinsic hypotheses. For instance, species with low ...

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