Abstract
Coexistence is thought to be based mainly on interspecific differences in the use of limiting resources and habitat choice, both being associated with specific traits. We studied morphological parameters within an assemblage of large wandering spider species in Costa Rica subdivided into three subguilds: (1) semi-aquatic species, (2) forestground dwellers and (3) vegetation dwellers. We hypothesized that the observed differences between the spider species in microhabitat preferences and abilities to adhere to smooth surfaces should be associated with corresponding morphological traits. The leg scopulation patterns were surprisingly complex and reflected the ecological preferences of the spiders. We found that the scopulation patterns and the ratio of tarsus to leg length (T/L) appeared to be most important: the poor adhesion abilities of the semi-aquatic species were reflected by the absence of tarsal claw tufts, and these species also showed the highest T/L ratio. The forest-ground dwellers had smaller claw tufts relative to body mass than the vegetation dwellers that consistently showed the best adhesion performance. This study presents the first family-spanning ecomorphological analysis of an assemblage of large tropical wandering spiders.
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Acknowledgments
We thank the German Academic Exchange Service (DAAD) for supporting fieldwork of WL in Costa Rica. Many thanks to the technical staff of the Electron Microscopy Department (University of Ulm) for valuable help with technical problems. Martin Pfeiffer (University of Ulm, Germany) helped with multivariate statistics. Hubert Höfer (State Museum of Natural History, Karlsruhe, Germany) provided us with valuable unpublished Masters’ and Doctoral theses. The MINAET (Ministerio de Ambiente, Energía y Telecomunicaciones, Costa Rica) gave us the permit to conduct the field work in Costa Rica and to export specimens. The friendly assistance of Javier Guevara (MINAET) is greatly appreciated. We are very grateful to Bernal Rodríguez-Herrera (RBT, UCR) and all staff members at the Reserva Biológica Tirimbina for their friendliness, support and for allowing us to realize this project at the station.
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Communicated by Andreas Schmidt-Rhaesa.
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Lapinski, W., Walther, P. & Tschapka, M. Morphology reflects microhabitat preferences in an assemblage of neotropical wandering spiders. Zoomorphology 134, 219–236 (2015). https://doi.org/10.1007/s00435-015-0257-8
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DOI: https://doi.org/10.1007/s00435-015-0257-8