Abstract
Techniques to evaluate elements of metacommunity structure (EMS; coherence, species turnover and range boundary clumping) have been available for several years. Such approaches are capable of determining which idealized pattern of species distribution best describes distributions in a metacommunity. Nonetheless, this approach rarely is employed and such aspects of metacommunity structure remain poorly understood. We expanded an extant method to better investigate metacommunity structure for systems that respond to multiple environmental gradients. We used data obtained from 26 sites throughout Paraguay as a model system to demonstrate application of this methodology. Using presence–absence data for bats, we evaluated coherence, species turnover and boundary clumping to distinguish among six idealized patterns of species distribution. Analyses were conducted for all bats as well as for each of three feeding ensembles (aerial insectivores, frugivores and molossid insectivores). For each group of bats, analyses were conducted separately for primary and secondary axes of ordination as defined by reciprocal averaging. The Paraguayan bat metacommunity evinced Clementsian distributions for primary and secondary ordination axes. Patterns of species distribution for aerial insectivores were dependent on ordination axis, showing Gleasonian distributions when ordinated according to the primary axis and Clementsian distributions when ordinated according to the secondary axis. Distribution patterns for frugivores and molossid insectivores were best described as random. Analysis of metacommunities using multiple ordination axes can provide a more complete picture of environmental variables that mold patterns of species distribution. Moreover, analysis of EMS along defined gradients (e.g., latitude, elevation and depth) or based on alternative ordination techniques may complement insights based on reciprocal averaging because the fundamental questions addressed in analyses are contingent on the ordination technique that is employed.
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Acknowledgements
S. J. P. was supported by the Center for Environmental Sciences and Engineering at the University of Connecticut during preparation of this manuscript. An exclusivity grant from COFAA-IPN and project SIP (2008-0193) supported C. L. G. during the development of this manuscript. Data collection was supported by the National Science Foundation via grants DEB-9400926, DEB-9741543 and DEB-9741134 to R. Owen and M. Willig, and by a Grant-in-aid from the American Society of Mammalogists to C. L. G. We thank curators and collection managers at The Museum of Texas Tech University, Museum d’Histoire Naturelle, Geneva, Switzerland, Museo Nacional de Historia Natural del Paraguay, U.S. National Museum of Natural History, Estación Biológica de Doñana, University of Connecticut, Museum of Zoology, University of Michigan, Museum of Vertebrate Zoology, Field Museum of Natural History, Museum of Comparative Zoology and American Museum of Natural History for granting access to their collections. Matlab script files were written by R. Strauss and C. Higgins. All research complied with the current laws of Paraguay. The exposition of the manuscript was improved as a consequence of comments provided by M. Leibold and an anonymous reviewer.
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Communicated by Elisabeth Kalko.
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Presley, S.J., Higgins, C.L., López-González, C. et al. Elements of metacommunity structure of Paraguayan bats: multiple gradients require analysis of multiple ordination axes. Oecologia 160, 781–793 (2009). https://doi.org/10.1007/s00442-009-1341-x
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DOI: https://doi.org/10.1007/s00442-009-1341-x