Reduced body sizes in climate-impacted Borneo moth assemblages are primarily explained by range shifts

Chung-Huey Wu, Jeremy D. Holloway, Jane K. Hill, Chris D. Thomas, I-Ching Chen () and Chuan-Kai Ho ()
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Chung-Huey Wu: National Taiwan University
Jeremy D. Holloway: The Natural History Museum
Jane K. Hill: University of York
Chris D. Thomas: University of York
I-Ching Chen: National Cheng Kung University
Chuan-Kai Ho: National Taiwan University

Nature Communications, 2019, vol. 10, issue 1, 1-7

Abstract: Abstract Both community composition changes due to species redistribution and within-species size shifts may alter body-size structures under climate warming. Here we assess the relative contribution of these processes in community-level body-size changes in tropical moth assemblages that moved uphill during a period of warming. Based on resurvey data for seven assemblages of geometrid moths (>8000 individuals) on Mt. Kinabalu, Borneo, in 1965 and 2007, we show significant wing-length reduction (mean shrinkage of 1.3% per species). Range shifts explain most size restructuring, due to uphill shifts of relatively small species, especially at high elevations. Overall, mean forewing length shrank by ca. 5%, much of which is accounted for by species range boundary shifts (3.9%), followed by within-boundary distribution changes (0.5%), and within-species size shrinkage (0.6%). We conclude that the effects of range shifting predominate, but considering species physiological responses is also important for understanding community size reorganization under climate warming.

Date: 2019
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DOI: 10.1038/s41467-019-12655-y

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