First test for eradication of beavers ( Castor canadensis ) in Tierra del Fuego, Argentina
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ORIGINAL PAPER
First test for eradication of beavers (Castor canadensis) in Tierra del Fuego, Argentina Pablo Jusim . Andrea P. Goijman . Julio Escobar . Marı´a Luisa Carranza . Adria´n Schiavini
Received: 6 February 2020 / Accepted: 13 August 2020 Springer Nature Switzerland AG 2020
Abstract The North American beaver (Castor canadensis) was introduced in 1946 from Canada to Isla Grande de Tierra del Fuego to develop a fur industry. Their expansion to most of the habitats of Tierra del Fuego and their presence on the continent, moved Argentina and Chile to test their eradication. The objective of this paper is to analyse a pilot eradication test and determine which variables are associated with the capture success of beavers in a small area of the Fuegian forest. The pilot was
conducted in the Corazo´n de la Isla reserve, Tierra del Fuego, Argentina, during April and May 2014, by three groups of trappers, using body-grip traps and snares. The capture success was modelled with different variables. A total of 115 individuals were captured after 590 and 265 body-grip and snare trapping-nights, respectively, with an overall efficiency of 13.5%. Using body-grip traps and placing traps in slides or burrows would increase trapping efficiency. This experience allowed us to evaluate
P. Jusim (&) J. Escobar A. Schiavini Centro Austral de Investigaciones Cientı´ficas, CONICET, Bernardo Houssay 200, Ushuaia, Tierra del Fuego, Argentina e-mail: [email protected]
M. L. Carranza ´ reas Protegidas y Biodiversidad, Direccio´n General de A Ushuaia, Tierra del Fuego, Argentina
P. Jusim Departamento de Ecologı´a, Gene´tica y Evolucio´n, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Auto´noma de Buenos Aires, Argentina
A. Schiavini Wildlife Conservation Society, Argentinian Representation, Ciudad Auto´noma de Buenos Aires, Argentina
P. Jusim A. Schiavini Instituto de Ciencias Polares, Ambiente y Recursos Naturales, Universidad Nacional de Tierra del Fuego, Ushuaia, Tierra del Fuego, Argentina A. P. Goijman Instituto de Recursos Biolo´gicos, Instituto Nacional de Tecnologı´a Agropecuaria, Hurlingham, Buenos Aires, Argentina
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techniques and generate recommendations for future beaver eradication trials on a larger scale: (a) the need to improve the data collection system through digital technology and georeferencing the location of operations, (b) the importance of the type of trap used according to the specific sites of the colony, (c) test alternative trapping strategies to reduce the eventual ‘‘learning’’ of animals, (d) drive the paradigm of hunters from yield oriented to eradication objectives and (e) ensure the political sustainability of the wider program. Keywords Castor canadensis Tierra del Fuego Eradication trial Invasive alien species
Fig. 1 Succession of beaver dams in the study area in 2004. Nothofagus sp. trees, common species in the original riparian forest, dead by flooding. All dams a
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