Why do snails have hairs? : A Bayesian inference of character evolution


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PFENNINGER, Markus, Magda HRABÁKOVÁ, Dirk STEINKE, Aline DÈPRAZ, 2005. Why do snails have hairs? : A Bayesian inference of character evolution. In: BMC Evolutionary Biology. 5(1), 59. ISSN 1471-2148. eISSN 1471-2148

@article{Pfenninger2005snail-28151, title={Why do snails have hairs? : A Bayesian inference of character evolution}, year={2005}, doi={10.1186/1471-2148-5-59}, number={1}, volume={5}, issn={1471-2148}, journal={BMC Evolutionary Biology}, author={Pfenninger, Markus and Hrabáková, Magda and Steinke, Dirk and Dèpraz, Aline}, note={Article Number: 59} }

Why do snails have hairs? : A Bayesian inference of character evolution Dèpraz, Aline eng Hrabáková, Magda 2005 Steinke, Dirk 2014-06-24T08:23:17Z 2014-06-24T08:23:17Z Dèpraz, Aline deposit-license Background<br /><br /><br />Costly structures need to represent an adaptive advantage in order to be maintained over evolutionary times. Contrary to many other conspicuous shell ornamentations of gastropods, the haired shells of several Stylommatophoran land snails still lack a convincing adaptive explanation. In the present study, we analysed the correlation between the presence/absence of hairs and habitat conditions in the genus Trochulus in a Bayesian framework of character evolution.<br /><br /><br /><br />Results<br /><br /><br />Haired shells appeared to be the ancestral character state, a feature most probably lost three times independently. These losses were correlated with a shift from humid to dry habitats, indicating an adaptive function of hairs in moist environments. It had been previously hypothesised that these costly protein structures of the outer shell layer facilitate the locomotion in moist habitats. Our experiments, on the contrary, showed an increased adherence of haired shells to wet surfaces.<br /><br /><br /><br />Conclusion<br /><br /><br />We propose the hypothesis that the possession of hairs facilitates the adherence of the snails to their herbaceous food plants during foraging when humidity levels are high. The absence of hairs in some Trochulus species could thus be explained as a loss of the potential adaptive function linked to habitat shifts. Pfenninger, Markus Steinke, Dirk BMC Evolutionary Biology ; 5 (2005). - 59 Hrabáková, Magda Pfenninger, Markus

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