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      Monitoreo de la población de perros ferales en la Isla de Cedros, Baja California, y las amenazas a la mastofauna nativa Translated title: Monitoring feral dog's population at Isla de Cedros, Baja California, and the associated threats over native mastofauna

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          Abstract

          El monitoreo de especies introducidas es una herramienta importante para preservar las especies nativas. El objetivo de este estudio fue monitorear a la población de perros ferales en la Isla de Cedros e identificar las amenazas actuales y potenciales de su presencia sobre la mastofauna nativa. La colecta de datos se realizó en dos áreas de la isla, la costa noreste (CNE) y la región centro-sur (RCS). Los patrones de distribución y la densidad de los perros se determinaron con un método no invasivo basado en el conteo de excretas a lo largo de transectos y se estimó la densidad relativa (R) y el índice de abundancia relativa fecal (fRAI). La composición de la dieta se evaluó por medio del análisis de las excretas. Tanto los valores de R como de fRAI fueron significativamente mayores (P < 0.05) en CNE que en RCS. Los resultados mostraron que los perros se alimentan de al menos tres especies de mamíferos endémicos (el venado bura, el conejo matorralero y el ratón de abazones de Cedros) y de dos especies de pinnípedos (el elefante marino del norte y el lobo marino de California). A partir de este estudio se cuenta con una línea de base que podrá ser usada en los programas de control y monitoreo futuros. Sin embargo, es necesario desarrollar estudios sobre el comportamiento alimentario de los perros para evaluar su actividad predatoria y medir el nivel de daño asociado; además, dado que las interacciones entre pinnípedos y perros parecen ser frecuentes y están relacionados filogenéticamente, posiblemente la mayor amenaza de la presencia de los perros sea la propagación de enfermedades infeccionas, con graves resultados para la vida silvestre.

          Translated abstract

          Monitoring introduced species is an important management tool in order to preserve native species. The aim of this study was to monitor the feral dog's population in Isla de Cedros and to identify actual and potential threats of their presence over the native mastofauna. Data were collected at two sampling areas of the island, the Northeast Coast (CNE) and the Central-South Region (RCS). Dog's distribution pattern and density was assess using a non-invasive method based on scat counts along transect surveys and relative density (R) and faecal relative abundance index (fRAI) were estimated. Dog's diet composition was evaluated by scat analysis. Both R and fRAI were significant greater (P < 0.05) in the CNE than in the RCS. The results showed that feral dogs are feeding from at least three endemic terrestrial mammal species (the mule deer, the brush rabbit, and the Anthony's pocket mouse) and two pinnipeds species (the northern elephant seal and the California sea lion). With this study provide a useful baseline for future comparison and monitoring and control purposes. Nevertheless, it is necessary to conduct studies about the dog's feeding behavior to measure their predatory activity and to assess the associated damage level. Also, due to the fact that interactions between dogs and pinnipeds appeared frequently and because they are phylogenetically related, the greatest threat of the dog's presence is that it could be a disease vector, with serious health outcomes for the wildlife.

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          Most cited references35

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          Comparison and quantification of carnivore diet by faecal analysis: a critique, with recommendations, based on a study of the Fox Vulpes vulpes

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            Yellowstone after Wolves

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              Biostatistical Analisis

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                Author and article information

                Journal
                azm
                Acta zoológica mexicana
                Acta Zool. Mex
                Instituto de Ecología A.C. (Xalapa, Veracruz, Mexico )
                0065-1737
                2448-8445
                April 2012
                : 28
                : 1
                : 37-48
                Affiliations
                [01] Ensenada B. C. orgnameInstituto Politécnico Nacional orgdiv1Centro Interdisciplinario de Ciencias Marinas México gaguilar@ 123456cicese.mx
                Article
                S0065-17372012000100003 S0065-1737(12)02800100003
                795f1922-a5df-4136-b2de-574df290a858

                This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.

                History
                : 18 October 2010
                : 10 November 2011
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 36, Pages: 12
                Product

                SciELO Mexico

                Categories
                Artículos originales

                amenazas,mastofauna,áreas insulares,perros ferales,wildlife threats,insular areas,Feral dogs

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