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Effects of bannertail kangaroo rat mounds on small-scale plant community structure

  • Plant Animal Interactions
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Abstract

The effects of bannertail kangaroo rat (Dipodomys spectabilis) mounds and associated soil-surface disturbance on plant species composition and diversity in the Chihuahuan Desert were examined with multivariate analysis. Kangaroo rat mounds created disturbance gaps and contributed to local species diversity by creating microhabitats that supported unique plant communities. These microhabitats supported populations of species that were relatively rare in surrounding areas. The diversity observed at the whole habitat level resulted from (1) local spatial heterogeneity, because the mounds offered microenvironments with distinctive nutrient, water, and light conditions; and (2) local patterning of disturbance, because the digging and traffic of the kangaroo rats maintained high levels of soil disturbance at and near the mounds. At a finer scale, species diversity was highest in the area immediately adjacent to active and inactive mounds, and was lower on both the highly disturbed soil of the mounds and in the relatively undisturbed area between mounds. Lowest species diversity occurred on inactive mounds. Annual plant biomass was much greater on mounds than in inter-mound areas. The results support the predictions that intermediate levels of disturbance and small-scale environmental heterogeneity contribute to supporting high species diversity.

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  1. Qinfeng Guo

    Present address: Laboratory of Structural Biology and Molecular Medicine, University of California, 90024, Los Angeles, CA, USA

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  1. Department of Biology, University of New Mexico, 87131, Albuquerque, NM, USA

    Qinfeng Guo

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Guo, Q. Effects of bannertail kangaroo rat mounds on small-scale plant community structure. Oecologia 106, 247–256 (1996). https://doi.org/10.1007/BF00328605

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  • DOI: https://doi.org/10.1007/BF00328605

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