A predicted niche shift corresponds with increased thermal resistance in an invasive mite, Halotydeus destructor

Global Ecology and Biogeography - Tập 22 Số 8 - Trang 942-951 - 2013
Matthew P. Hill1, Steven L. Chown2,3, Ary A. Hoffmann4,1
1Department of Zoology, Bio21 Institute, The University of Melbourne, Parkville, Vic., 3010 Australia
2Centre for Invasion Biology, Stellenbosch University, Stellenbosch, South Africa
3School of Biological Sciences, Monash University, Melbourne VIC 3800, Australia
4Department of Genetics, Bio21 Institute, The University of Melbourne, Parkville, Vic., 3010 Australia

Tóm tắt

AbstractAimPredicted distributions of invasive species are often not congruent between their realized native and introduced ranges, but the reasons for this are rarely investigated empirically. We tested for niche shift in an invasive species using a simple framework combining environmental niche models (ENMs) and niche‐limiting thermal tolerance traits.LocationAustralia and South Africa.MethodsThe red‐legged earth mite, Halotydeus destructor, native to South Africa, is a major agricultural pest in Australia and has expanded its range to areas not predictable from its native range in the last 40 years. Revisiting recently constructed ENMs for H. destructor, we select populations in both native and invasive ranges that appear to occupy different niches. We characterize thermal tolerance traits and test for acclimation patterns of cold tolerance of these H. destructor populations to test for niche shifts.ResultsAustralian populations had an increased upper thermal threshold for movement and were able to recover from cold stress more rapidly than South African populations. Australian populations also differed in trait means from the likely source population in South Africa. Acclimation patterns were conserved across ranges for most populations, with 10 °C acclimation lowering the onset of and recovery from cold tolerance and 15 °C raising them when compared with field‐acclimated populations.Main conclusionsThese results support the prediction, based on ENMs, that H. destructor may have undergone a niche shift by adapting to environmental conditions in Australia. The increase in thermal resistance has implications for how this invasive species will respond to future climate change.

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Global Ecology and Biogeography

Tập 22 Số 8

942-951

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