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Temporal shifts and niche overlapping in Copestylum (Diptera, Syrphidae) communities reared in cactus species in a central Mexican scrubland

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Ecological Research

Abstract

Semiarid scrubland communities are highly dynamic in terms of their species composition, abundance, and functioning, given the drastic changes in climate among seasons. Spatiotemporal patterns of saprophagous Copestylum (Diptera: Syrphidae) communities in different cactus species richness have not yet been studied, although seasonal changes and plant species richness have been shown to strongly impact the diversity and distribution of many insect communities in scrublands. We analyzed the impact of seasonality and of habitat type (disturbed and undisturbed) on Copestylum communities reared from cactus species at the Barranca de Metztitlán Biosphere Reserve, in central Mexico, by comparing their community structure between seasons and habitats, and assessing the contribution of diversity components for the total diversity of this genus. We also measured patterns of temporal niche overlap among hoverfly species considering their breeding medium. Seasonal variation influenced Copestylum community composition most significantly. Species richness and abundance of Copestylum were higher in the rainy season. Additive partitioning of diversity showed that the main component for species richness is beta diversity between seasons. We detected high niche overlap during the dry season and low overlap during the rainy season. This study provides evidence of temporal shifts in xeric hoverfly communities and suggests that the Copestylum species partition resources over time.

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Acknowledgments

This research was supported by AECID (project A/020305/08), FOMIX CONACYT-Hidalgo (project 95828) and SEP-CONACYT (project 84127). We extend our gratitude to the management of the Barranca de Metztitlán Biosphere Reserve for assisting us in this research. We are grateful to Chris Thompson of the Smithsonian Institution for making available the unpublished manuscript keys. We appreciate discussions with Dr. Graham Rotheray, Dr. Catherine Numa, R. Briones, and P.E. Cruz-Dominguez. C. Aguilar-Miguel, M.C. García-Chávez, and P. Carbó assisted with the fieldwork. A.P.M. acknowledges the scholarship provided by The Alβan programme, the European Union Programme of High Level Scholarships for Latin America, no. E07D401138MX and CONACYT program (207522) for doctoral fellowship.

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Correspondence to Ana Paola Martínez-Falcón.

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Martínez-Falcón, A.P., Marcos-García, M.Á. & Moreno, C.E. Temporal shifts and niche overlapping in Copestylum (Diptera, Syrphidae) communities reared in cactus species in a central Mexican scrubland. Ecol Res 26, 341–350 (2011). https://doi.org/10.1007/s11284-010-0788-x

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