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

Détails

Ressource 1Télécharger: BIB_C2A8A9271926.P001.pdf (583.46 [Ko])
Etat: Serval
Version: de l'auteur
ID Serval
serval:BIB_C2A8A9271926
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Why do snails have hairs? A Bayesian inference of character evolution.
Périodique
BMC Evolutionary Biology
Auteur(s)
Pfenninger M., Hrabáková M., Steinke D., Dèpraz A.
ISSN
1471-2148
Statut éditorial
Publié
Date de publication
2005
Volume
5
Pages
59
Langue
anglais
Notes
Publication types: Journal Article ; Research Support, Non-U.S. Gov't
Résumé
BACKGROUND: 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. RESULTS: 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. CONCLUSION: 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.
Mots-clé
Adaptation, Biological, Animal Structures, Animals, Bayes Theorem, DNA Primers, Data Interpretation, Statistical, Ecosystem, Environment, Evolution, Hair, Humidity, Marine Biology, Markov Chains, Movement, Phylogeny, Polymerase Chain Reaction, Selection (Genetics), Sequence Analysis, DNA, Snails, Species Specificity
Pubmed
Open Access
Oui
Création de la notice
19/11/2007 11:47
Dernière modification de la notice
09/05/2019 0:51
Données d'usage