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Reasons for success: rapid evolution for desiccation resistance and life-history changes in the polyphagous fly Anastrepha ludens

Tejeda, Marco Tulio | Arredondo, José [autor/a] | Liedo Fernández, Pablo [autor/a] | Pérez Staples, Diana [autor/a] | Ramos Morales, Patricia [autor/a] | Díaz Fleischer, Francisco [autor/a].
Tipo de material: Artículo
 en línea Artículo en línea Tema(s): Anastrepha ludens | Disecación | Reproducción de insectos | Demografía | Análisis genéticoTema(s) en inglés: Anastrepha ludens | Desiccation | Insect reproduction | Demography | Genetic analysisNota de acceso: Disponible para usuarios de ECOSUR con su clave de acceso En: Evolution. volumen 70, número 11 (November 2016), páginas 2583-2594. --ISSN: 1558-5646Número de sistema: 10009Resumen:
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Species that exhibit broad ranges of distribution may successfully navigate environmental changes by modifying some of their life-history traits. Environmental humidity imposes a critical stress that organisms may overcome by increasing their resistance to desiccation. We used experimental evolution to investigate adaptation to desiccation in the tephritid Anastrepha ludens, a species with high fecundity, late maturation, and long lifespan.We measured morphological, physiological, developmental as well as demographic changes involved in the adaptation to desiccation. Notwithstanding a low heritability (h² = 0.237), desiccation resistance evolved extremely rapidly and few negative trade-offs were detected. Selected flies exhibited correlated increases in longevity, body size, the amount of body lipids, and bulk water content, and in the duration of the pupal stage. Females further delayed sexual maturation, decreased daily fecundity but retained high lifetime reproductive potential. No differences in male mating competitiveness were found. Selected and control lines differed in longevity but not in total female fecundity, demonstrating that A. ludens flies have the capability for fast adaptation to desiccation without loosing their reproductive capability. Thus, it seems that a rapid evolutionary response to desiccation in this polyphagous insect works as a buffer for environmental variation and reduces the strength of selection on reproductive traits.

Recurso en línea: http://onlinelibrary.wiley.com/doi/10.1111/evo.13070/full
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Species that exhibit broad ranges of distribution may successfully navigate environmental changes by modifying some of their life-history traits. Environmental humidity imposes a critical stress that organisms may overcome by increasing their resistance to desiccation. We used experimental evolution to investigate adaptation to desiccation in the tephritid Anastrepha ludens, a species with high fecundity, late maturation, and long lifespan.We measured morphological, physiological, developmental as well as demographic changes involved in the adaptation to desiccation. Notwithstanding a low heritability (h² = 0.237), desiccation resistance evolved extremely rapidly and few negative trade-offs were detected. Selected flies exhibited correlated increases in longevity, body size, the amount of body lipids, and bulk water content, and in the duration of the pupal stage. Females further delayed sexual maturation, decreased daily fecundity but retained high lifetime reproductive potential. No differences in male mating competitiveness were found. Selected and control lines differed in longevity but not in total female fecundity, demonstrating that A. ludens flies have the capability for fast adaptation to desiccation without loosing their reproductive capability. Thus, it seems that a rapid evolutionary response to desiccation in this polyphagous insect works as a buffer for environmental variation and reduces the strength of selection on reproductive traits. eng

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