A practical framework for selecting among single- species, community-, and ecosystem-based recovery plans

نویسندگان

  • Mark S. Poos
  • Nicholas E. Mandrak
  • Robert L. McLaughlin
چکیده

Science-based approaches for selecting among single-species, community-, and ecosystem-based recovery plans are needed to conserve imperilled species. Selection of recovery plans has often been based on past success rates with other taxa and systems or on economic cost, but less on the ecology of the system in question. We developed a framework for selecting a recovery plan based on the distributions and ecology of imperilled and nonimperilled species across available habitat types and applied it to fishes in the Sydenham River, Ontario, Canada. We first tested whether distributions of fishes were adequately predicted by habitat features hypothesized to limit the distributions of imperilled fishes versus a broader set of habitat features known to predict fish distributions. We then tested whether imperilled species occurred in similar or disparate habitat types. For the Sydenham River, an ecosystem-based recovery plan was deemed most appropriate because imperilled species occur in disparate habitat types. We lastly provide decision criteria to facilitate applications of our framework to the selection of recovery plans for other species and systems. Résumé : Afin d’assurer la conservation des espèces en péril, il est nécessaire de posséder des méthodes basées sur la science pour choisir entre les plans de récupération centrés sur une seule espèce, sur une communauté ou sur un écosystème. Le choix d’un plan de récupération se base souvent plus sur les taux de succès obtenus avec d’autres taxons et dans d’autres systèmes ou sur le coût économique, mais moins sur l’écologie du système en question. Nous avons mis au point un cadre de sélection d’un plan de récupération basé sur la répartition et l’écologie des espèces menacées et non menacées dans les différents types d’habitats disponibles et nous l’avons utilisé dans le cas des poissons de la rivière Sydenham, Ontario, Canada. En premier lieu, nous avons vérifié si les répartitions des poissons pouvaient être adéquatement prédites d’après les caractéristiques de l’habitat que nous soupçonnions limiter les répartitions des poissons menacés, par comparaison à celles obtenues à partir d’un éventail connu et plus étendu de caractéristiques de l’habitat capable de prédire les répartitions de poissons. Nous avons ensuite vérifié si les espèces menacées se retrouvaient dans des types d’habitat similaires ou disparates. Dans la Sydenham, un plan de récupération à l’échelle de l’écosystème nous semble plus approprié car les espèces menacées vivent dans des types d’habitat disparates. Nous fournissons enfin des critères de choix pour faciliter l’utilisation de notre cadre dans la sélection des plans de récupération pour d’autres espèces et systèmes. [Traduit par la Rédaction]

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تاریخ انتشار 2008