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      Ciclos de vida de insectos dulceacuícolas y cambio climático global en la ecorregión subantártica de Magallanes: investigaciones ecológicas a largo plazo en el Parque Etnobotánico Omora, Reserva de Biosfera Cabo de Hornos (55° S) Translated title: Life cycles of freshwater invertebrates and global climate change in the sub-Antarctic Magellanicecoregion: long-term ecological research at the Omora Ethonobotanical Park, Biosphere Reserve Cape Horn (55° S)


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          El Parque Etnobotánico Omora, ubicado en la ecorregión subantártica y en la Reserva de Biosfera Cabo de Hornos (55° S) es el sitio más austral de la red LTSER-Chile. El Parque protege la cuenca hidrográfica del río Róbalo, que provee de agua a Puerto Williams, la capital de la Provincia Antártica Chilena. El año 2008, se inició un estudio a largo plazo sobre la diversidad, historias de vida y distribución de insectos acuáticos asociados al río Róbalo, y otros cursos de agua en la isla Navarino. Estos estudios son de gran interés para la red LTSER-Chile y la ciencia mundial por tres razones: 1) las características climáticas únicas de los ecosistemas dulceacuícolas de la ecorregión subantártica de Magallanes, que contrastan con aquellas del Hemisferio Norte; 2) las respuestas de los insectos dulceacuícolas y sus ciclos de vida son muy sensibles a la temperatura, y bajo condiciones de gradientes térmicos del gradiente altitudinal del río Róbalo se pueden hacer predicciones bajo distintos escenarios de Cambio Climático Global; y 3) los ciclos de vida de insectos dulceacuícolas han sido muy poco estudiados en el suroeste de Sudamérica, e incorporando el gradiente latitudinal con estudios similares de respuestas fenológicas de los insectos dulceacuícolas incorporando otros sitios de la Red LTSER-Chile permitiría evaluar señales tempranas de esta biota al cambio climático global.

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          The Omora Ehtonobotanical Park (55° S) is the southernmost site of the LTSER network-Chile and the interdisciplinary research center of the Cape Horn Biosphere Reserve in the sub-Antarctic Magellanic ecoregion. The park protects the Róbalo River watershed that provides water to Puerto Williams, the capital of the Chilean Antarctic Province. In 2008, we initiated long-term studies on the diversity, distribution and life histories of aquatic insects associated with the Róbalo River and other streams on Navarino Island. These studies are of major interest to the LTSER-Chile network and to world science for three reasons: 1) the unique climatic characteristics of the sub-Antarctic Magellanic ecoregion, which contrast with those of the Northern Hemisphere; 2) responses of freshwater insects and their life cycles are very sensitive to temperature, and along the thermic variations associated with the altitudinal gradient of the Róbalo River we can make predictions for various scenarios of Global Climate Change; 3) the life cycles of freshwater insects have been understudied in southwestern South America, and by incorporating similar studies of phenological responses of freshwater insects at other sites LTSER-Chile sites along a latitudinal gradient will allow us to assess early signals of this biota to global climate change.

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          Most cited references31

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          Influences of species, latitudes and methodologies on estimates of phenological response to global warming

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            Climate change and freshwater ecosystems: impacts across multiple levels of organization.

            Fresh waters are particularly vulnerable to climate change because (i) many species within these fragmented habitats have limited abilities to disperse as the environment changes; (ii) water temperature and availability are climate-dependent; and (iii) many systems are already exposed to numerous anthropogenic stressors. Most climate change studies to date have focused on individuals or species populations, rather than the higher levels of organization (i.e. communities, food webs, ecosystems). We propose that an understanding of the connections between these different levels, which are all ultimately based on individuals, can help to develop a more coherent theoretical framework based on metabolic scaling, foraging theory and ecological stoichiometry, to predict the ecological consequences of climate change. For instance, individual basal metabolic rate scales with body size (which also constrains food web structure and dynamics) and temperature (which determines many ecosystem processes and key aspects of foraging behaviour). In addition, increasing atmospheric CO(2) is predicted to alter molar CNP ratios of detrital inputs, which could lead to profound shifts in the stoichiometry of elemental fluxes between consumers and resources at the base of the food web. The different components of climate change (e.g. temperature, hydrology and atmospheric composition) not only affect multiple levels of biological organization, but they may also interact with the many other stressors to which fresh waters are exposed, and future research needs to address these potentially important synergies.
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                Author and article information

                Bosque (Valdivia)
                Bosque (Valdivia)
                Universidad Austral de Chile, Facultad de Ciencias Forestales (Valdivia, , Chile )
                : 35
                : 3
                : 429-437
                [07] Bronx New York orgnameWildlife Conservation Society orgdiv1Latin American and Caribbean Program USA
                [05] Denton TX orgnameUniversity of North Texas orgdiv1Department of Philosophy and Religion Studies USA
                [03] orgnameParque Etnobotánico Omora orgdiv1Programa de Conservación Biocultural Subantártica Chile
                [04] Denton TX orgnameUniversity of North Texas orgdiv1Department of Biology Science USA
                [06] Flagstaff Arizona orgnameNorthern Arizona University orgdiv1Department of Biological Sciences USA
                [02] Santiago orgnameUniversidad de Chile orgdiv1Instituto de Ecología y Biodiversidad Chile
                [01] Punta Arenas orgnameUniversidad de Magallanes Chile tamara.contador@ 123456umag.cl
                S0717-92002014000300018 S0717-9200(14)03500300018

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

                : 14 October 2014
                : 14 July 2014
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 32, Pages: 9

                SciELO Chile


                benthic macroinvertebrates,phenology,stream ecology,conservation,macroinvertebrados bentónicos,fenología,ecología de ríos,conservación


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