Lower selected body temperatures after food deprivation in the lizard Anolis carolinensis

Brown, Richard P.; Griffin, Samuel

doi:10.1016/j.jtherbio.2004.07.005

Cited by 62 publications

(49 citation statements)

References 36 publications

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“…The preference for cooler temperatures while unfed (figure 1) is similar to that observed in some ectothermic vertebrates [22][23][24]. Leeches may wait many months between meals [15], and a cooler temperature preferendum would minimize energy expenditure during the interim [25].…”

Section: Discussionsupporting

confidence: 62%

Leeches run cold, then hot

et al. 2011

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Food processing is costly, potentially limiting the energy and time devoted to other essential functions such as locomotion or reproduction. In ectotherms, post-prandial thermophily, the selection of a warm environmental temperature after feeding, may be advantageous in minimizing the duration of this elevated cost. Although present in many vertebrate taxa, this behaviour had not previously been observed in invertebrates. Sanguivorous leeches ingest large blood meals that are costly to process and limit mobility until excess fluid can actively be expelled to reduce body volume. When presented with a temperature gradient from 108 8 8 8 8C to 308 8 8 8 8C, leeches select a temperature that is significantly warmer (24.3 + + + + + 0.98 8 8 8 8C, n 5 6) than their acclimation temperature (T a , 218 8 8 8 8C). Unfed leeches preferred temperatures that were significantly cooler than ambient (12.8 + + + + + 0.98 8 8 8 8C, n 5 6). This behavioural strategy is consistent with minimizing the time course of elevated post-feeding energy costs and reducing energy expenditure during fasting. Our observations raise the possibility that thermoregulatory behaviour of this type is an unrecognized feature of other invertebrate taxa.

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Section: Discussionsupporting

confidence: 62%

Leeches run cold, then hot

et al. 2011

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“…When faced with short-term variations in the thermal environment, many lizards can respond quickly by exhibiting behavioral thermoregulation, usually involving microhabitat selection and eventual specific postures (Huey 1982). However, when faced with long-term environmental changes, species may respond with evolutionary shifts in physiology and behavior (Huey and Kingsolver 1989;Castilla et al 1999;Brown and Griffin 2005;Carretero et al 2005Carretero et al , 2006. In these cases, a "phylogenetic signal" will be detected, describing a pattern for evolutionarily related organisms to phenotypically resemble each other (Blomberg et al 2003).…”

Section: Introductionmentioning

confidence: 99%

Ecophysiology Tracks Phylogeny and Meets Ecological Models in an Iberian Gecko

Rato

Carretero²

2015

Physiological and Biochemical Zoology

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Because fitness of ectotherms, including reptiles, is highly dependent on temperature and water availability, the study of ecophysiological traits, such as preferred temperature (T p) and water loss rates (WLRs), may provide mechanistic evidence on the restricting factors to the species ranges. The Moorish gecko, Tarentola mauritanica, is a species complex with a circum-Mediterranean distribution. In the Iberian Peninsula, two sister parapatric forms of the complex, known as the Iberian and the European clades, are found. Ecological models previously performed using presence records and bioclimatic variables suggest niche divergence between both lineages correlated with precipitation rather than with temperature. In this study, we test this correlative hypothesis using ecophysiological evidence. In the laboratory, we analyzed the T p and WLRs for 84 adult males from seven distinct populations ascribed to one of the two lineages present in Iberia. Specifically, we evaluated the existence of trait conservatism versus adaptation among populations, lineages, or both. In addition, we tested for a trade-off between water and thermal traits and assessed whether climate regime of sampling localities had any influence on the ecophysiological patterns found. We found that T p is quite conserved at both the population and lineage levels and independent from body size. In contrast, water loss experiments revealed some variation among populations, but the regression analysis failed to detect correlation between T p and WLR at any level. Overall, the European lineage displayed a trend for higher water loss and was more diverse among populations when compared with the Iberian lineage. The lack of correspondence between ecophysiological traits and local climatic conditions favors phylogenetic signal versus adaptation. This suggests divergent evolutionary responses to the environment, mainly acting on water ecology, in both lineages, which may account for the differences in their range expansion.

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“…Because lizards thermoregulate between lower and upper threshold temperatures (Barber and Crawford, 1977), an adequate knowledge of the set-points that enclose PTR is essential for evaluating the extent and mechanisms of thermoregulation (Hertz et al, 1993;Bauwens et al, 1996;Dı´az and Cabezas-Dı´az, 2004). These set-points can best be measured in a laboratory thermal gradient where environmental constraints can be controlled, thus allowing to estimate the T b 's that ectotherms would attempt to attain in the field in the absence of physical or biotic restrictions (Huey, 1974;Christian and Tracy, 1981;Van Marken Lichtenbelt et al, 1997;Brown and Griffin, 2005).…”

Section: Introductionmentioning

confidence: 99%