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The importance of productivity and seasonality for structuring small rodent diversity across a tropical elevation gradient

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Abstract

Photosynthetic productivity is a key determinant of the abundance and distribution of biodiversity around the world. The effect of this productivity on the distribution patterns of mammals is frequently invoked; however, it is seldom measured directly. In this study, we used Sherman live traps set in dry and rainy seasons across a 2300-m elevation gradient in southwestern Mexico to assess small rodent species distributions, and to relate these patterns to habitat structure, climate, and a well-accepted measure of photosynthetic productivity: the normalized difference vegetation index (NDVI). While habitat structure and climate helped explain some of the patterns observed, NDVI proved to be the most important contributing variable for most of the distribution models. We also found that partitioning the gradient-distribution model by trapping season revealed strong differences in terms of the effect of NDVI and the other explanatory variables. For example, lower elevations were associated with seasonal and year-round reductions in rodent diversity and were composed almost exclusively of granivore-based species assemblages. By contrast, the middle and upper elevations were more species rich, less affected by seasonality, and characterized by omnivorous species. Our results suggest that the positive productivity–diversity relationship found may be due, at least in part, to increased food resources and niche opportunities at more productive elevations. Increased diversity at the higher elevations may also be partially due to reductions in competition that result from productivity increases, as well as from the broader spectrum of feeding guild representation that it and the lack of seasonality allow.

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Acknowledgements

We thank M. Briones-Salas for support with field methods, V. Sánchez-Cordero for helpful suggestions that improved the study, and to the communities of San Pedro Jilotepec and Magdalena Tequisistlán for allowing us to conduct the field work in their territory.

Funding

ARB acknowledges the Mexican National Commission of Science and Technology (CONACyT) for the dissertation grant (#237201) that made this research possible.

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Contributions

Both authors contributed equally to designing the study. ARB collected the data, performed the initial analyses and wrote the first draft. Both authors contributed equally to subsequent revisions of the analyses and manuscript.

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Correspondence to John N. Williams.

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Authors declare no conflict of interests.

Additional information

Communicated by Janne Sundell.

This study helps clarify the altitudinal relationship between small mammal diversity, seasonality and primary productivity in a tropical setting.

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Ramírez-Bautista, A., Williams, J.N. The importance of productivity and seasonality for structuring small rodent diversity across a tropical elevation gradient. Oecologia 190, 275–286 (2019). https://doi.org/10.1007/s00442-018-4287-z

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  • DOI: https://doi.org/10.1007/s00442-018-4287-z

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