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Conserv Physiol
2016 Jan 01;41:cow056. doi: 10.1093/conphys/cow056.
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Thermal ecological physiology of native and invasive frog species: do invaders perform better?
Cortes PA
,
Puschel H
,
Acuña P
,
Bartheld JL
,
Bozinovic F
.
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Biological invasions are recognized as an important biotic component of global change that threatens the composition, structure and functioning of ecosystems, resulting in loss of biodiversity and displacement of native species. Although ecological characteristics facilitating the establishment and spread of non-native species are widely recognized, little is known about organismal attributes underlying invasion success. In this study, we tested the effect of thermal acclimation on thermal tolerance and locomotor performance in the invasive Xenopus laevis and the Chilean native Calyptocephalella gayi. In particular, the maximal righting performance (μMAX), optimal temperature (TO), lower (CTmin) and upper critical thermal limits (CTmax), thermal breadth (Tbr) and the area under the performance curve (AUC) were studied after 6 weeks acclimation to 10 and 20°C. We observed higher values of μmax and AUC in X. laevis in comparison to C. gayi. On the contrary, the invasive species showed lower values of CTmin in comparison to the native one. In contrast, CTmax, TO and Tbr showed no inter-specific differences. Moreover, we found that both species have the ability to acclimate their locomotor performance and lower thermal tolerance limit at low temperatures. Our results demonstrate that X. laevis is a better performer than C. gayi. Although there were differences in CTmin, the invasive and native frogs did not differ in their thermal tolerance. Interestingly, in both species the lower and upper critical thermal limits are beyond the minimal and maximal temperatures encountered in nature during the coldest and hottest month, respectively. Overall, our findings suggest that both X. laevis and C. gayi would be resilient to climate warming expectations in Chile.
Figure 1:. Performance curves of righting response in both the native Calyptocephalella gayi (circles) and the invasive Xenpus laevis (triangles) acclimated for 6 weeks at 10°C (cold acclimation; a) and 20°C (warm acclimation; b). There were 10 specimens of each species; five subjected to treatment and five to control conditions. Values are shown as means ± SEM.
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