Geographical variation in thermal tolerance within Southern Ocean marine ectotherms

Morley, Simon Anthony ORCID: https://orcid.org/0000-0002-7761-660X; hirse, timo; poertner, hans-otto; Peck, Lloyd ORCID: https://orcid.org/0000-0003-3479-6791. 2009 Geographical variation in thermal tolerance within Southern Ocean marine ectotherms. Compararitive Biochemsitry and Physiology part A, 153A (2). 154-161. 10.1016/j.cbpa.2009.02.001

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Abstract/Summary

Latitudinal comparisons of the Southern Ocean limpet, Nacella concinna, and clam, Laternula elliptica, acclimated to 0.0 °C, were used to assess differences in thermal response to two regimes, 0.0, 5.1 to 10.0 °C and 2.5, 7.5 to 12.5 °C, raised at 5.0 °C per week. At each temperature, tissue energy status was measured through a combination of O2 consumption, intracellular pH, cCO2, citrate synthase (CS) activity, organic acids (succinate, acetate, propionate), adenylates (ATP, ADP, AMP, ITP, PLA (phospho-L-arginine)) and heart rate. L. elliptica from Signy (60°S) and Rothera (67°S), which experience a similar thermal regime (−2 to +1 °C) had the same lethal (7.5–10.0 °C), critical (5.1–7.5 °C) and pejus (b5.1 °C;=getting worse) limits with only small differences in biochemical response. N. concinna, which experiences a wider thermal regime (−2 to +15.8 °C), had higher lethal limits (10.0–12.5 °C). However, at their Northern geographic limit N. concinna, which live in a warmer environment (South Georgia, 54°S), had a lower critical limit (5.1–10.0 °C; O2, PLA and organic acids) than Rothera and Signy N. concinna (10.0–12.5 °C). This lower limit indicates that South Georgia N. concinna have different biochemical responses to temperatures close to their thermal limit, which may make them more vulnerable to future warming trends

Item Type:	Publication - Article
Digital Object Identifier (DOI):	10.1016/j.cbpa.2009.02.001
Programmes:	BAS Programmes > Global Science in the Antarctic Context (2005-2009) > Biodiversity, Functions, Limits and Adaptation from Molecules to Ecosystems BAS Programmes > Antarctic Funding Initiative Projects
ISSN:	1095-6433
NORA Subject Terms:	Marine Sciences Biology and Microbiology
Date made live:	07 May 2010 14:25 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/9662

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