Inter-population differences in the tolerance of a marsupial folivore to plant secondary metabolites
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Abstract
Plant secondary metabolites (PSMs) strongly influence diet selection by mammalian herbivores. Concentrations of PSMs vary within and among plant species, and across landscapes. Therefore, local adaptations may cause different populations of herbivores to differ in their ability to tolerate PSMs. Here, we tested the food intake responses of three populations of a marsupial folivore, the common brushtail possum (Trichosurus vulpecula Kerr), from different latitudes and habitat types, to four types of PSMs. We found clear variation in the responses of northern and southern Australian possums to PSMs. Brushtail possums from southern Australia showed marked decreases in food intake in response to all four PSMs, while the two populations from northern Australia were not as sensitive and their responses did not differ from one another. These results were unexpected, based on our understanding of the experiences of these populations with PSMs in the wild. Our results suggest that geographically separated populations of possums may have evolved differing abilities to cope with PSMs, as a result of local adaptation to their natural environments. Our results provide the basis for future studies to investigate the mechanisms by which populations of mammalian species differ in their ability to tolerate PSMs.
Keywords
Brushtail possum Diet selection Herbivory Local adaptation Plant defenceNotes
Acknowledgments
We thank Karen Marsh for help with trapping and care of the possums and Rob Gegg for technical and workshop assistance. We are grateful to Mark Brewer, Alex Douglas and Bob Forrester for statistical advice. Karen Marsh, Stuart McLean, Arlene McDowell and Ivan Lawler provided useful discussions and Glenn Iason commented on an earlier version of the manuscript. R. and E. Fryer and the Nasser family kindly allowed us to use their land. We thank Karen and Neil Coombes for their kind hospitality and assistance with trapping. We are grateful to Unitan for generously donating the quebracho. Funding was provided by grants from the Australian Research Council to C. N. J./A. K. K. and W. J. F. and the Australian National University to J. L. D. J. L. D. was supported by an Australian National University Graduate School Scholarship. This research was approved by the Queensland Government Environmental Protection Agency, the ACT Parks and Conservation Service and the Animal Experimentation Ethics Committees of the Australian National University and James Cook University, and conforms to the Australian Code of Practice for the Care and Use of Animals for Scientific Purposes.
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