Testing the metabolic cold adaptation hypothesis: an intraspecific latitudinal comparison in the common woodlouse

Lardies, MA; Bacigalupe, LD; Bozinovic F.

Abstract

The metabolic cold adaptation (MCA) hypothesis predicts an increase in the metabolic rate of ectotherms from cold environments compared with their more temperate counterparts. This adaptive hypothesis is one of the most controversial in physiological ecology, for which the evidence comes principally from the meta-analysis of data sets of arthropods. Important for the study of metabolic cold adaptation are comparisons at a geographic level, especially on a latitudinal scale, because mean annual temperature decreases towards high latitudes. Furthermore, few studies have conducted intraspecific comparisons of metabolic rates along a latitudinal gradient. We tested the MCA hypothesis in the common woodlouse, Porcellio laevis, using different populations along a distributional range with a wide range of mean ambient temperatures (5°, 12°, 18° and 25°C) in Chile. Our results demonstrated that metabolic rate increased towards low latitudes - that is, woodlice from the warmer (i.e. northern) part of the distribution range had markedly higher metabolic rates than those from the cooler (i.e. southern) region, for almost all experimental temperatures. Thus, our results provide direct evidence of intraspecific latitudinal differences in metabolism, rejecting the MCA hypothesis, which is more difficult to resolve with interspecific level comparisons.

Más información

Título según WOS: Testing the metabolic cold adaptation hypothesis: an intraspecific latitudinal comparison in the common woodlouse
Título según SCOPUS: Testing the metabolic cold adaptation hypothesis: An intraspecific latitudinal comparison in the common woodlouse
Título de la Revista: EVOLUTIONARY ECOLOGY RESEARCH
Volumen: 6
Número: 4
Editorial: Evolutionary Ecology Ltd.
Fecha de publicación: 2004
Página de inicio: 567
Página final: 578
Idioma: English
Notas: ISI, SCOPUS