Abstract
Evolutionary ecologists often seek to explain life history variation at geographical scales. Progress in this regard has been slower in social insects than in unitary organisms, due in part to limited information about species distributions and the complexity of studying colony-level traits. Temnothorax ants have proven useful for investigating associations between ecology and life history traits in ants, because they have small colonies (<200 workers) with substantial variation in traits like queen number within and across populations. Yet most of these studies have focused on <10 Temnothorax species from northern latitudes, although the genus contains >400 species that range from temperate to tropical biomes. Here, we generate the first global map of Temnothorax diversity and demonstrate that previous ecological hypotheses for colony life history variation in the genus are based on data and studies confined to a small part of the overall genus-level distribution. For example, studies of northern-latitude species have suggested that overwintering success is a prominent selective force favoring polygyny but little is known about polygyny in Temnothorax species from other regions. We report the highest observed queen numbers known in the genus in the subtropical species T. tuscaloosae and confirm that all queens in these polygynous colonies are mated and actively laying eggs. Behavioral laboratory experiments further indicate that this species has a fluid nest structure and lacks intraspecific aggression at the whole-forest scale. These results extend the biogeographical extent of life history studies for this genus and point to evolutionary discoveries awaiting comparative research of the global Temnothorax fauna.
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Acknowledgments
We dedicate this paper to E. O. Wilson who described T. tuscaloosae in 1951 in his first taxonomic paper on ants. We would like to thank Tim Linksvayer and Joe MacGown for providing us records, respectively, from Tennessee and Mississippi. Collections in State Parks of North Carolina were supported by a permit from the NC Division of Parks and Recreation. Collections in Georgia National Forests were supported by a permit from the US Forest Service. Collections conducted in Virginia, West Virginia and Lake Raleigh (NC) were performed on private lands with permission from their respective owners. Ed Olson and John Blake for their assistance in locating field sites at Savannah River Site, a National Environmental Research Park. Logistical support was provided by the Department of Energy-Savannah River Operations Office through the U.S. Forest Service Savannah River under Interagency Agreement DE-AI09-00SR22188. Mike Joyce and the U.S. Forest service for permitting research insect collections.
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B. Guénard and J. Z. Shik with equal contributions to the study.
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Guénard, B., Shik, J.Z., Booher, D. et al. Extreme polygyny in the previously unstudied subtropical ant Temnothorax tuscaloosae with implications for the biogeographic study of the evolution of polygyny. Insect. Soc. 63, 543–551 (2016). https://doi.org/10.1007/s00040-016-0498-7
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DOI: https://doi.org/10.1007/s00040-016-0498-7