Assessment of the efficiency in trapping North American mink (Neovison vison) for population control in Patagonia

Indexación: Web of Science; Scielo.BACKGROUND: Introduced species can have a major negative impact on biodiversity; an example is the American mink, which was introduced in the 1930s in Patagonia. While there is a consensus that reversing alien mustelids continental scale invasions remains unfeasible, there is little consensus, given a maximum cost or investment, on the feasibility and efficiency of region-wide control or eradication. Thus, our goal was to provide information about efficiency for mink control in Patagonia METHODS: Between January 2009 and February 2013 this study was conducted in ten study sites (4 km to 15 km long) between 39°S to 45°S latitude. Minks were trapped using cage traps operated by two trappers. We estimated the population density at each study site assuming they were close populations, exhibit intrasexual territoriality and the home range of females were smaller than those of males. We obtained a theoretical population and a modeled population from our trapping results. Sixty five minks were trapped over 2190 trap nights (0.03 mink/trap night). Mink captures were higher in the first six days and in the first trapping campaigns. A two person team was able to control a maximum distance of approximately 6 km of river shore by foot and 15 km of sea and lake shores by boat. There was an over linear increase of operational costs as time passed. Our modeled population was 91% of the theoretical population CONCLUSIONS: We believe that to trap and remove a minimum of 70% of the mink population in a region under ideal circumstances, traps should be deployed every 200 m and after the sixth day should be moved to another new transect. We suggest an annual repetition of this strategy as the more efficient for controlling mink populations in terms of trapping success and reduced costs. The number of traps will depend on the number of trappers participating and also on habitat characteristicshttp://ref.scielo.org/qcr5j

Spartan Daily, January 10, 1955

Volume 42, Issue 62https://scholarworks.sjsu.edu/spartandaily/12112/thumbnail.jp

Barnes Hospital Bulletin

https://digitalcommons.wustl.edu/bjc_barnes_bulletin/1059/thumbnail.jp

Barnes Hospital Bulletin

https://digitalcommons.wustl.edu/bjc_barnes_bulletin/1171/thumbnail.jp

Genetic variation of wild American mink (Neovison vison) in the Province of Santa Cruz. Is the genetic paradox of invasive species met?

Las especies invasoras constituyen una amenaza para la biodiversidad nativa. El éxito de las especies invasoras pese a su baja variabilidad genética se conoce como “paradoja genética”. El visón americano (Neovison vison) fue introducido en varias regiones del planeta como Europa, Asia y América del Sur con fines peleteros. En Argentina fue introducido en la década de 1930 y, como resultado de la liberación de individuos en la na-turaleza, lograron establecerse poblaciones silvestres en la región Patagónica. El objetivo del presente trabajo es estudiar la diversidad genética de una población asilvestrada de la provincia de Santa Cruz y compararla con la de una población en cautiverio. Analizamos un fragmento de 359 pb de la región control de ADN mitocondrial y encontramos índices de variabilidad similares entre la población silvestre y la población cautiva. Al igual que en poblaciones asilvestradas de otras regiones del planeta, no se observa una reducción en la variabilidad genética en la población silvestre de Santa Cruz, probablemente como consecuencia de liberaciones y escapes recurrentes desde diversas fuentes de cautiverio.Alien species represent a threat to native biodiversity. The suc-cess of invasive species despite their reduced genetic diversity is known as “the genetic paradox”. The American mink (Neovison vison) was introduced in several regions of the world, like Europe, Asia and South America. In Argentina, they were introduced in the 1930’s by the fur industry and wild populations were established in Patagonia due to liberations and escapes. In this study, we analyzed the genetic diversity of a wild American mink population of northern Santa Cruz province and compared it with a captive population. We sequenced a 359-bp fragment of the mtDNA control region and found that genetic variability was similar between both groups. Like in other wild invasive populations, genetic variability was not reduced in the population of Santa Cruz, probably as a consequence of frequent releases and escapes from different sources of captive minks.Fil: Malerba, Martina. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Ecología, Genética y Evolución. Laboratorio de Ecología y Comportamiento Animal; ArgentinaFil: Fasola, Laura. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Roesler, Carlos Ignacio. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Ecología, Genética y Evolución. Laboratorio de Ecología y Comportamiento Animal; ArgentinaFil: Pereda, Maria Inés. Aves Argentinas; ArgentinaFil: de Miguel, Andrés. Aves Argentinas; ArgentinaFil: Martina, Florencia Lucia. Aves Argentinas; ArgentinaFil: Mahler, Bettina. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Ecología, Genética y Evolución. Laboratorio de Ecología y Comportamiento Animal; Argentin

Barnes Hospital Bulletin

https://digitalcommons.wustl.edu/bjc_barnes_bulletin/1183/thumbnail.jp

Barnes Hospital Bulletin

https://digitalcommons.wustl.edu/bjc_barnes_bulletin/1163/thumbnail.jp

Spartan Daily, September 28, 1953

Volume 42, Issue 4https://scholarworks.sjsu.edu/spartandaily/11910/thumbnail.jp