Genetic, morphological, and life history traits variation in freshwater snails from extremely high environments of the Andean Altiplano
Author
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Collado, Gonzalo A.
Author
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Salinas, Hugo F.
es_CL
Author
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Méndez, Marco
es_CL
Admission date
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2014-12-30T18:30:13Z
Available date
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2014-12-30T18:30:13Z
Publication date
dc.date.issued
2014
Cita de ítem
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Zoological Studies 2014, 53:14
en_US
Identifier
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DOI: 10.1186/1810-522X-53-14
Identifier
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https://repositorio.uchile.cl/handle/2250/119883
General note
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Artículo de publicación ISI
en_US
Abstract
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Background: The isolated watersheds of the southwestern Andean Altiplano constitute a natural laboratory to
study the evolutionary divergence of freshwater biota. Field observations showed that Biomphalaria snails from
Parinacota, Colpa, and Caquena have different shell sizes. We performed morphometric analysis and common
garden experiment to evaluate whether the observed shell variation has a genetic base and if this variation is
manifested in other morphological characters and life history traits.
Results: Network analysis revealed that the snails of Parinacota form a lineage genetically distinct from Caquena
and Colpa. The morphometric analysis of the shell showed that the Parinacota snails were larger than Caquena and
Colpa, both in nature and laboratory conditions, but there was no evidence of difference in the shape of the shell
when compared using multivariate analyses. The number of eggs per ovicapsule was the only life history trait that
was significantly different between lineages, although this difference may be also attributed to size of the progenitor;
the oviposition rate did not differ between lineages or localities, and the hatching size and growth rate differed only at
the locality level, not lineages.
Conclusion: The results suggest that shell size of the snails has a genetic basis associated to the phenotype, while the
expression and evolution of life history traits in extreme high environments are highly influenced by proximal causes.
en_US
Patrocinador
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CONICYT: Programa Nacional de Becas de Postgrado-Doctorado
2005 No. 21050661. This study was financed by projects FONDECYT 3110072,
1110243, and 1110188 and the Programa de Cooperación Internacional
CONICYT grant ECOS-CONICYT C10B02 and grant REDES130016.