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• W2092201483 abstract "We compared the distribution of historical bird and mammal species extinctions across genera and families with the distribution we would expect if these extinctions had occurred at random with respect to taxonomy. We then repeated the comparison for species listed in various categories of threat according to the 1996 Red List of the World Conservation Union. We found the distributions of extinctions and threat classifications to be almost always nonrandom—“selective”—with clustering in certain genera and families. Furthermore, extinctions tended to be clustered in taxa that contain few species; species in smaller genera tended to have higher probabilities of extinction. This tendency was strong for historical extinctions but was reduced or absent for some categories of threat. We attribute this to a change in the causes of extinction whereby predation and introduced species have been joined or superseded by widespread habitat loss. We then assessed the implications of this variable selectivity for the past and likely future losses of genera and families. In most cases, the number of lost taxa rises. Finally, we made predictions about minimum losses of taxa at specific dates in the future and showed that, despite the reduction in some forms of selectivity, we will still lose more taxa than if species extinctions were random.Selectividad Taxonomica Presente y Futura Extinciones de Aves y MamiferosSe comparo la distribucion de las extinciones historicas de especies de aves y mamiferos con la distribucion que se esperaria si las extinciones hubieran ocurrido al azar con respecto a la taxonomia. La comparacion fue repetida para las especies incluidas en distintas categorias de riesgo en la Lista Roja de la UICN. En casi todos los casos se encontro que las distribuciones de las extinciones y de las categorias de riesgo no estaban distribuidas al azar, sin que fueron ‘selectivas,’ con distribucion agrupada en ciertos generos y familias. Se observo, ademas, que las extinciones tendieron a estar agrupadas en taxones que contienen pocas especies; las especies en generos mas pequenos tienden a tener mayores probabilidades de extincion. Esta tendencia fue fuerte para las extinciones historicas, pero reducida o ausente para algunas categorias de riesgo. Esto se atribuyo a un cambio en las causas de extincion, donde la predacion y las especies introducidas se han sumado o han sido reemplazadas por la gran destruccion de habitat. Se evaluaron luego las consecuencias de esta selectividad variable para las extinciones de generos y familias en el pasado y en un futuro probable. En la mayoria de los casos el numero de taxones extinguidos aumenta. Finalmente, se hicieron predicciones acerca de las extinciones minimas de taxones en el futuro, demostrandose que, a pesar de la reduccion en algunas formas de selectividad, se extinguiran mas taxones que si las extinciones fueran al azar." @default.
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• W2092201483 date "1998-12-01" @default.
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• W2092201483 title "Present and Future Taxonomic Selectivity in Bird and Mammal Extinctions" @default.
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• W2092201483 doi "https://doi.org/10.1111/j.1523-1739.1998.96332.x" @default.
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