Journal
JOURNAL OF EXPERIMENTAL BIOLOGY
Volume 216, Issue 9, Pages 1683-1694Publisher
COMPANY OF BIOLOGISTS LTD
DOI: 10.1242/jeb.081232
Keywords
thermal tolerance breadth; groundwater crustaceans; free amino acids; immune defense; locomotor activity
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Funding
- Agence Nationale de la Recherche [ANR-08-JCJC-0120-01]
- Institut Universitaire de France
- Agence Nationale de la Recherche (ANR) [ANR-08-JCJC-0120] Funding Source: Agence Nationale de la Recherche (ANR)
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The climate variability hypothesis assumes that the thermal tolerance breadth of a species is primarily determined by temperature variations experienced in its environment. If so, aquatic invertebrates living in thermally buffered environments would be expected to exhibit narrow thermal tolerance breadths (stenothermy). We tested this prediction by studying the thermal physiology of three isopods (Asellidae, Proasellus) colonizing groundwater habitats characterized by an annual temperature amplitude of less than 1 degrees C. The species responses to temperature variation were assessed in the laboratory using five physiological variables: survival, locomotor activity, aerobic respiration, immune defense and concentrations of total free amino acids and sugars. The three species exhibited contrasted thermal physiologies, although all variables were not equally informative. In accordance with the climate variability hypothesis, two species were extremely sensitive even to moderate changes in temperature (2 degrees C) below and above their habitat temperature. In contrast, the third species exhibited a surprisingly high thermal tolerance breadth (11 degrees C). Differences in response to temperature variation among Proasellus species indicated that their thermal physiology was not solely shaped by the current temperature seasonality in their natural habitats. More particularly, recent gene flow among populations living in thermally constant yet contrasted habitats might explain the occurrence of eurytherm species in thermally buffered environments.
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