Integrating Riparian Nothofagus Antarctica Forests to the Study of Beaver Invasion on Tierra del Fuego Island, Argentina

Rosina Soler

Nothofagus antarctica (ñire) forests of Tierra del Fuego Island, experience the dual effects of high impacts from both livestock and beaver (Castor canadensis), and we will explore the natual recovery under these conditions.

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There are about 200,000 ha of Nothofagus antarctica forests on Tierra del Fuego Island, mainly found in the central and northern part of the island at the ecotone with the steppe biome. Consequently, it is the sub-Antarctic Forest type with the highest proportion of livestock farms, including cattle and sheep. Additionally, most riparian forests of Tierra del Fuego Island have been impacted by beaver (Castor canadensis), an invasive species that uses this forest for building dams and food. Practically nothing is known about the response of ñire forests to this invasion. Moreover, the fact that ñire forests experience the dual effects of high intensity impacts from both livestock and beaver makes the study of this unit of the landscape especially relevant.

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This project will examine the effects of Castor canadensis on forests structure and natural regeneration of N. antarctica, along its distribution in Tierra del Fuego. The knowledge about the natural regeneration of ñire mainly concerning the mechanisms adopted by this species under stress conditions, which will enhance its sustainable management in competition with other productive uses, such as ranching and forestry. This will help for spatial planning of forests and forestry policy definitions at the medium and long-term.

The recovery of ñire forests will depend 1) on the degree of disturbance in the environment and 2) the capacity of natural tree regeneration and their mechanisms against different types of damages. Research into these specific study areas is a high priority for management and conservation of this area.

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