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La expansión del área de distribución impulsada por el clima y la evolución morfológica en un gastropodo marino
M E Hellberg1, D P Balch, K Roy
1Department of Biological Sciences, 508 Life Sciences Building, Louisiana State University, Baton Rouge, LA 70803, USA.
Science (New York, N.Y.)
|June 2, 2001
Resumen
El cambio climático global impacta en los fenotipos de los gasterópodos marinos. Las expansiones de rango, no los refugios, impulsan una evolución morfológica significativa en las poblaciones de Acanthinucella spirata.
Área de la Ciencia:
- Paleontología Paleontología.
- Biología evolutiva Biología evolutiva.
- Biología Marina Biología Marina.
Sus antecedentes:
- Los efectos del cambio climático global en los fenotipos de las especies son poco conocidos.
- El registro fósil del Pleistoceno ofrece información sobre los cambios evolutivos impulsados por el clima en el pasado.
- Los gasterópodos marinos proporcionan modelos valiosos para el estudio de las respuestas evolutivas.
Objetivo del estudio:
- Para investigar las consecuencias fenotípicas del cambio climático del Pleistoceno en los gasterópodos marinos.
- Para determinar si la evolución morfológica se produjo en refugios o durante los cambios de rango.
- Para vincular la variación genética con los cambios morfológicos observados.
Principales métodos:
- Medidas morfológicas de poblaciones existentes y del Pleistoceno de Acanthinucella spirata.
- Secuenciación del ADN mitocondrial de las poblaciones vivas de Acanthinucella spirata.
- Análisis comparativo de la morfología de las conchas en diferentes poblaciones y períodos de tiempo.
Principales resultados:
- Las poblaciones del norte exhibieron una variación genética limitada, lo que sugiere una reciente expansión de la gama hacia el norte.
- Las poblaciones del norte recientemente recolonizadas mostraron morfologías únicas del caparazón ausentes en las poblaciones y fósiles del sur.
- La divergencia morfológica estaba relacionada con los cambios geográficos en el área de distribución en lugar del aislamiento en los refugios.
Conclusiones:
- Los cambios en la distribución geográfica en respuesta al cambio climático pueden ser un importante impulsor de la evolución morfológica.
- La evolución morfológica puede ocurrir rápidamente durante las expansiones de rango, desafiando las visiones tradicionales de la evolución en refugios.
- Acanthinucella spirata proporciona un estudio de caso para comprender la dinámica evolutiva impulsada por el clima en los invertebrados marinos.
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