Artículo
Effects of environmental perturbations during postnatal development on the phenotypic integration of the skull
Fecha de publicación:
12/2011
Editorial:
Veterinary and Human Toxicology
Revista:
Journal Of Experimental Zoology Part B-molecular And Developmental Evolution
ISSN:
1552-5007
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
Integration and modularity are fundamental determinants of how natural selection effects evolutionary change in complex multivariate traits. Interest in the study of the specific developmental basis of integration through experimental approaches is fairly recent and it has mainly focused on its genetic determinants. In this study, we present evidence that postnatal environmental perturbations can modify the covariance structure by influencing the variance of some developmental processes relative to the variances of other processes that contribute to such structure. We analyzed the effects of the reduction of nutrient supply in different ontogenetic stages (i.e. before and after weaning, and from birth to adulthood) in Rattus norvegicus. Our results show that this environmental perturbation alters the phenotypic variation/covariation structure of the principal modules of the skull (base, vault, and face). The covariance matrices of different treatment groups exhibit low correlations and are significantly different, indicating that the treatments influence covariance structure. Postnatal nutrient restriction also increases the variance of somatic growth. This increased variance drives an increase in overall integration of cranial morphology through the correlated allometric effects of size variation. The extent of this increase in integration depends on the time and duration of the nutritional restriction. These results support the conclusion that environmental perturbations can influence integration and thus covariance structure via developmental plasticity.
Palabras clave:
Environmental Perturbations
,
Phenotypic Integration
,
Iugr
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Articulos(IGEVET)
Articulos de INST.DE GENETICA VET ING FERNANDO NOEL DULOUT
Articulos de INST.DE GENETICA VET ING FERNANDO NOEL DULOUT
Citación
Gonzalez, Paula Natalia; Oyhenart, Evelia Edith; Hallgrimsson, Benedikt; Effects of environmental perturbations during postnatal development on the phenotypic integration of the skull; Veterinary and Human Toxicology; Journal Of Experimental Zoology Part B-molecular And Developmental Evolution; 316 B; 8; 12-2011; 547-561
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