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Open AccessArticle

Sub-Antarctic Freshwater Invertebrate Thermal Tolerances: An Assessment of Critical Thermal Limits and Behavioral Responses

1
Wankara Sub-Antarctic and Antarctic Freshwater Ecosystems Laboratory, Sub-Antarctic Biocultural Conservation Program, Universidad de Magallanes, Puerto Williams, Teniente Muñoz 166, Chile
2
Institute of Ecology and Biodiversity, Universidad de Chile, Santiago, Las Palmeras 3425, Chile
3
Antarctic and Sub-Antarctic Sciences Ph.D. Program, Universidad de Magallanes, Punta Arenas, Avenida Bulnes 01855, Chile
4
Núcleo Milenio de Salmónidos Invasores, INVASAL, Iniciativa Científica Milenio, ICM, Núcleo Científico Milenio, Concepción, Casilla 160-C, Chile
5
British Antarctic Survey, NERC, Cambridge CB3 0ET, UK
6
Department of Biological Sciences, University of North Texas, 1511W Sycamore, Denton, TX 76201, USA
*
Author to whom correspondence should be addressed.
Insects 2020, 11(2), 102; https://doi.org/10.3390/insects11020102
Received: 30 November 2019 / Revised: 9 January 2020 / Accepted: 15 January 2020 / Published: 4 February 2020
(This article belongs to the Special Issue Polar Entomology)
Physiological thermal limits of organisms are linked to their geographic distribution. The assessment of such limits can provide valuable insights when monitoring for environmental thermal alterations. Using the dynamic critical thermal method (CTM), we assessed the upper (CTmax) and lower (CTmin) thermal limits of three freshwater macroinvertebrate taxa with restricted low elevation distribution (20 m a.s.l.) and three taxa restricted to upper elevations (480 and 700 m a.s.l.) in the Magellanic sub-Antarctic ecoregion of southern Chile. In general terms, macroinvertebrates restricted to lower altitudinal ranges possess a broader thermal tolerance than those restricted to higher elevations. Upper and lower thermal limits are significantly different between taxa throughout the altitudinal gradient. Data presented here suggest that freshwater macroinvertebrates restricted to upper altitudinal ranges may be useful indicators of thermal alteration in their habitats, due to their relatively low tolerance to increasing temperatures and the ease with which behavioral responses can be detected. View Full-Text
Keywords: critical thermal limits; ecophysiology; elevation; freshwater macroinvertebrates; restricted distribution critical thermal limits; ecophysiology; elevation; freshwater macroinvertebrates; restricted distribution
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MDPI and ACS Style

Rendoll-Cárcamo, J.; Contador, T.; Convey, P.; Kennedy, J. Sub-Antarctic Freshwater Invertebrate Thermal Tolerances: An Assessment of Critical Thermal Limits and Behavioral Responses. Insects 2020, 11, 102.

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