Autor: Alfredo R. Reca

Alfredo Reca

Prioridades de conservación de los mamíferos de Argentina

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Las 339 especies de mamíferos autóctonos vivientes de la República Argentina fueron calificadas según su necesidad de conservación siguiendo las categorías de la ley 22.421 y su reglamentación, dando como resultado 15 especies Amenazadas de Extinción; 22 Vulnerables; 78 Raras; 22 Indeterminadas; 166 No Amenazadas; 33 Insuficientemente Conocidas, y 3 sin evaluación. La calificación se basó en el uso de una metodología de base y la participación de 33 expertos. La metodología utiliza un índice ordenador-orientador (SUMIN) el cual se genera a partir de factores de importancia para la supervivencia y la conservación de las especies. Sus resultados serán evaluados periódicamente por la SAREM.

Conservation priorities of the native mammals of Argentina. 339 recent native mammals species of Argentina were qualified according to their conservation status, following the Law 22.421 categories and its reglamentation. Their findings were: 15 Extintion Threatened Species; 22 Vulnerable; 78 Rare; 22 Indeterminate; 166 Not Threatened; 33 Insufficiently Known, and 3 not evaluated. This qualification was based on a basic methodological approach: a sorting and guiding index developed from the quantification of several important survival and conservation factors (SUMIN), and with the participation of 33 specialists. Their conclusions will be evaluated periodically by SAREM.

Conservación de la fauna de tetrápodos II: estado de conservación de los mamíferos del Parque y Reserva Nacional Nahuel Huapi

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The conservation status of the fauna of mammals of the Nahuel Huapi National Park and Reserve is evaluated in the present work. All 32 resident and 5 marginal mammals in the study area were considered in the methodology which consists in assessing the degree of conservation of each species through an index made up by 12 survival-related variables. A list of species ordered according to their conservation indices for Argentina was obtained. The addition of two variables accounting for the particular situation of the species within the study area, allowed the elaboration of another list showing the conservation requirements for the Park and Reserve. Both ordinations were similar. The species in most critical conservation situation are the «huemul patagónico» (Hippocamelus bisulcus), the «huillín» (Lutra provocax), the «tuco-tuco colonial» (Ctenomys sociabilis) and the «gato huiña» (Felis guigna). The variables of the greatest influence upon the value of the index are those related to distribution and space-use plasticity. The results were compared with conservation evaluations of the same species made by other researchers and institutions. Differences and similitudes between evaluations were detected. Both the index value and its component variables provide an useful tool in making decisions for conservation and management.

Conservación de la fauna de tetrápodos I: un índice para su evaluación

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This paper presents a methodology for ranking species according to conservation priorities, based on explicit, quantifiable criteria. Species are ranked through an index which is a sum of values assigned to 12 factors relevant to their survival: continental distribution, national distribution, extent of the use of habitat, extent of the use of vertical space, body size, reproductive potential, trophic amplitude, abundance, taxonomic singularity, singularity, extractive action and degree of protection of the species. The method was applied to 141 autochthonous tetrapod species of the Argentine Nothofagus forests. Results were compared to other qualifications by international and national organizations. The method is objective, and therefore repeatable and verifiable. It can be updated as new information becomes available. It is a useful guide for conservation and management, and because of its simplicity can expeditiously respond to concrete requirements. If the circumstances under which the method was calculated persist, it may become predictive.