Cambio Climático Global en El Contexto De La Ecorregión Subantártica De Magallanes Y La Reserva De Biósfera Cabo De Hornos

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This article presents the main attributes of Magellanic sub-Antarctic ecoregion, and of the Sub-Antarctic Biocultural Conservation Program coordinated by UMAG, the Institute of Ecology and Biodiversity and the University of North Texas, which integrates ecological and ethical dimensions in the analyses of socioecological processes at local, regional, national, and international scales.

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8 p.

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Mansilla, Andrés O.; Ojeda, Jaime & Rozzi, Ricardo May 15, 2012.

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  • Mansilla, Andrés O. Universidad de Magallanes; Instituto de Ecologia y Biodiversidad
  • Ojeda, Jaime Universidad de Magallanes
  • Rozzi, Ricardo Universidad de Magallanes; Instituto de Ecologia y Biodiversidad; University of North Texas

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  • Main Title: Cambio Climático Global en El Contexto De La Ecorregión Subantártica De Magallanes Y La Reserva De Biósfera Cabo De Hornos
  • Parallel Title: Global Climate Change in the Eco-Region Subantarctic of Magellan and the Cape Horn Biosphere Reserve

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Description

This article presents the main attributes of Magellanic sub-Antarctic ecoregion, and of the Sub-Antarctic Biocultural Conservation Program coordinated by UMAG, the Institute of Ecology and Biodiversity and the University of North Texas, which integrates ecological and ethical dimensions in the analyses of socioecological processes at local, regional, national, and international scales.

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8 p.

Notes

Resumen: Los estudios sobre la biología del caiquén (Chloephaga picta) en los ecosistemas subantárticos de Chile son escasos y, fundamentalmente, constituyen registros anecdóticos sobre la especie. Con el fin de aportar en su conocimiento, se estudió su biología reproductiva en términos del tamaño de puesta, sitios de nidificación y éxito reproductivo en función de variables del hábitat en isla Navarino (54-55ºS), Reserva de Biosfera Cabo de Hornos (RBCH), Chile. Se monitorearon 79 nidos en hábitats costeros durante 54 días del período reproductivo en 2005/2006 y durante 59 días en 2006/2007. El tamaño de puesta fue 6,1 ± 1,2 huevos. Los nidos fueron preferentemente construidos en aquellos sitios costeros con pendiente baja (0-10º), en hábitat de matorral (70,5%), dominado por Chiliotrichum diffussum (30,8%) y Berberis buxifolia (24,4%). Las piedras fueron el elemento mayoritario en los hábitats de nidificación (50,1%). La cobertura vegetacional sobre el nido fue baja (0-25%) en un 82,1% de los nidos, y la adyacente fue intermedia (25-50%) en un 29,5% de ellos. Un 39,7% de los nidos fue construido en hábitats con una cobertura relativamente alta (>40%). En total, un 36,7% de los nidos presentaron eclosión de huevos (exitosos según método tradicional) y un 57,0% de los nidos fueron depredados. No se encontró una asociación del éxito o fracaso de nidificación a variables de hábitat. La probabilidad de éxito reproductivo fue de un 20,0% (método Mayfield). Ambos valores calculados están por debajo de los reportados para otras especies de gansos (>60%) y, también, de los reportados para esta especie (61-75%) en islas Malvinas-Falklands (<300 km de isla Navarino). Este estudio muestra la necesidad de conocer más aspectos de la biología y conservación de C. picta en la RBCH, particularmente cuando se consideran los cambios ambientales (especies invasoras, desarrollo turístico, cambio climático, etc.) que están ocurriendo en los sistemas subantárticos.

Abstract: Studies on the biology of the Upland Goose (Chloephaga picta) in Chilean Sub-Antarctic ecosystems are scarce and basically constitute anecdotic records of the species. With the aim to broaden this knowledge, we studied its breeding biology in terms of clutch size, nesting sites and breeding success as a function of habitat variables on Navarino Island (54-55ºS), Cape Horn Biosphere Reserve(CHBR), Chile. We monitored 79 nests in coastal habitats during 54 days of breeding activity in the nesting season of 2005/2006 and 59 days in 2006/2007. Clutch size was 6.1 ± 1.2 eggs. Nests were preferably built on coastal sites with low slope (0-10º). The dominant breeding habitat was shrubland (70.5%) dominated by Chiliotrichum diffussum (30.8%) and Berberis buxifolia (24.4%). Pebbles were the most common element on the nesting sites (50.1%). The overhead nest concealment was low (0-25%) in 82.1% of the nests, andlateralcoverage wasintermediate(25-50%) in 29.5%. 39.7% of the nests were built in habitats with relatively high vegetation cover (>40%). In total, 36.7% of the clutches hatched (successful following the traditional method) and 57,0% were predated. Measured habitat variables did not explain success or failure of the nests. The nest survival probability was 20,0% (Mayfield method). The two calculated values are lower than those reported in other geese species (>60%) and also than values (61-75%) reported for this species in Falkland-Malvinas Islands (<300 km from Navarino Island). This study shows the need of understanding more aspects of the biology and conservation of C. picta in the CHBR, in particular when considering the environmental changes (invasive species, tourism development, climate change, etc) currently going on in the Sub-Antarctic systems.

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  • Anales del Instituto de la Patagonia, 2012. Punta Arenas, Chile: Universidad de Magallanes

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  • Publication Title: Anales del Instituto de la Patagonia
  • Volume: 40
  • Issue: 1
  • Pages: 69-76
  • Peer Reviewed: Yes

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  • May 15, 2012

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  • October 17, 2011

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  • May 15, 2012

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  • June 26, 2018, 9:56 p.m.

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Mansilla, Andrés O.; Ojeda, Jaime & Rozzi, Ricardo. Cambio Climático Global en El Contexto De La Ecorregión Subantártica De Magallanes Y La Reserva De Biósfera Cabo De Hornos, article, May 15, 2012; Punta Arenas, Chile. (digital.library.unt.edu/ark:/67531/metadc1181174/: accessed November 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT College of Arts and Sciences.