Resumo

RODRIGUEZ-DEL-BOSQUE, Luis Angel. A conceptual model for coexistence between Phyllophaga crinita and Anomala flavipennis in agroecosystems of northeastern Mexico. Agric. Téc. Méx [online]. 2007, vol.33, n.1, pp.89-94. ISSN 0568-2517.

The diversity of white grubs in northern Tamaulipas, Mexico, includes ten species in the genus Phyllophaga and Anomala. However, only two species, Phyllophaga crinita (Burmeister) and Anomala flavipennis Burmeister, comprise 97% of the adults captured in light traps and larvae collected from soil samples in commercial fields of grain sorghum and maize. A study conducted during 25 years (1979-2003) at Río Bravo, Tamaulipas, Mexico, showed similar high captures of P. crinita y A. flavipennis adults in the same light trap during late April and early May. If this was the only available information considered, a strong competition between the two species might be suggested. However, if these two species share similar ecological niches (root feeding) and habitats (underground), why do they coexist?. The present report discusses the mechanisms and strategies of P. crinita y A. flavipennis that allow them to coexist in the agroecosystems of northern Tamaulipas. Differences in their temporal and spatial distribution and population attributes are discussed. A conceptual model is proposed that indicates that the coexistence of both species in this region is mainly due to a low probability for competition (4%) in time and space for food (roots).

Palavras-chave : Anomala flavipennis; Phyllophaga crinita; interspecific competition; ecology; niche; habitat.

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