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Un efecto Bruce en las geladas salvajes.

Eila K Roberts¹, Amy Lu, Thore J Bergman

¹Department of Psychology, University of Michigan, Ann Arbor, MI 48109, USA.

Science (New York, N.Y.)

|February 25, 2012

Resumen

Este resumen es generado por máquina.

Las geladas hembras silvestres exhiben el efecto Bruce, terminando el 80% de los embarazos cuando un nuevo macho dominante toma el control. Esta interrupción del embarazo parece ser una estrategia adaptativa, que potencialmente previene el infanticidio y ofrece beneficios físicos.

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Área de la Ciencia:

El comportamiento reproductivo de los primates.
Biología evolutiva Biología evolutiva.
Comportamiento animal Comportamiento animal.

Sus antecedentes:

El efecto Bruce, la interrupción del embarazo en roedores expuestos a machos desconocidos, está bien documentado en entornos de laboratorio.
La evidencia directa del efecto Bruce en las poblaciones naturales, particularmente en los primates, sigue siendo escasa.

Objetivo del estudio:

Para investigar la ocurrencia del efecto Bruce en una población de primates salvajes, el gelada.
Para determinar si la interrupción del embarazo en geladas es una estrategia adaptativa vinculada al riesgo de infanticidio.

Principales métodos:

Estudio de observación de una población de gelada silvestre.
Monitoreo de los ciclos reproductivos femeninos y las adquisiciones masculinas.
Análisis de los intervalos entre nacimientos en relación con los cambios en la dominación masculina.

Principales resultados:

Se observó un efecto Bruce significativo en las geladas, con el 80% de los embarazos terminados después de un reemplazo masculino dominante.
Los datos del intervalo entre nacimientos sugieren que interrumpir el embarazo proporciona ventajas físicas a las hembras cuando la descendencia enfrenta el riesgo de infanticidio.

Conclusiones:

El efecto Bruce ocurre en primates salvajes, específicamente en las geladas.
La interrupción del embarazo en geladas es probablemente una estrategia adaptativa para mejorar la condición física femenina evitando el infanticidio.