Sub-Antarctic freshwater invertebrate thermal tolerances: an assessment of critical thermal limits and behavioral responses

Rendoll Cárcamo, Javier; Contador, Tamara; Convey, Peter ORCID: https://orcid.org/0000-0001-8497-9903; Kennedy, James. 2020 Sub-Antarctic freshwater invertebrate thermal tolerances: an assessment of critical thermal limits and behavioral responses. Insects, 11 (2), 102. 10.3390/insects11020102

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Official URL: https://www.mdpi.com/2075-4450/11/2/102

Abstract/Summary

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.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	10.3390/insects11020102
ISSN:	20754450
Additional Keywords:	Critical thermal limits, ecophysiology, elevation, freshwater macroinvertebrates, restricted distribution
Date made live:	10 Feb 2020 12:26 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/526103

Item Type:

Publication - Article

Digital Object Identifier (DOI):

10.3390/insects11020102

ISSN:

20754450

Additional Keywords:

Critical thermal limits, ecophysiology, elevation, freshwater macroinvertebrates, restricted distribution

Date made live:

10 Feb 2020 12:26 +0 (UTC)

URI:

https://nora.nerc.ac.uk/id/eprint/526103