Robustez de las redes planta-visitante floral en simulaciones de cambio climático

  • Mariano Devoto Cátedra de Botánica, Facultad de Agronomía de la Universidad de Buenos Aires, Buenos Aires, Argentina.
  • Martín Zimmermann Depto. de Física, Fac. de Ciencias Exactas y Naturales, Univ. de Buenos Aires, Buenos Aires, Argentina.
  • Diego Medan Cátedra de Botánica, Facultad de Agronomía de la Universidad de Buenos Aires, Buenos Aires, Argentina.
Palabras clave: disrupción de mutualismos, interacción planta-polinizador, Patagonia, cambio global, extinción, anidamiento

Resumen

El cambio climático amenaza la integridad de las redes de polinización al desacoplar la plantas de sus polinizadores tanto fenológica como ecológicamente. En este trabajo simulamos un desplazamiento de los rangos geográficos de las especies de visitantes florales a lo largo de un abrupto gradiente de precipitación este-oeste y exploramos los patrones de extinción resultantes. Los sistemas estudiados resultaron moderadamente robustos ante los desplazamientos de distribución generados. Esto se puede explicar por (a) la correlación positiva entre el número de sitios a lo largo del gradiente en que fue encontrada una especie (de planta o de visitante floral) y su número de especies mutualistas tanto a nivel local (en cada sitio) como regional (agregando entre sitios), (b) el patrón de ensamble anidado que muestran las interacciones a nivel regional. En un contexto más general, este estudio resulta una herramienta útil para comprender la relación entre la estructura de interacciones de una red mutualista y su respuesta ante la amenaza del cambio climático.

Citas

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Publicado
2007-06-01
Sección
Sección Especial