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The effectiveness of common thermo-regulatory behaviours in a cool temperate grasshopper


Harris, RMB and McQuillan, P and Hughes, L, The effectiveness of common thermo-regulatory behaviours in a cool temperate grasshopper, Journal of Thermal Biology, 52 pp. 75-83. ISSN 0306-4565 (2015) [Refereed Article]

Copyright Statement

Copyright 2015 Elsevier

DOI: doi:10.1016/j.jtherbio.2015.06.001


Behavioural thermoregulation has the potential to alleviate the short-term impacts of climate change on some small ectotherms, without the need for changes to species distributions or genetic adaptation. We illustrate this by measuring the effect of behaviour in a cool temperate species of grasshopper (Phaulacridium vittatum) over a range of spatial and temporal scales in laboratory and natural field experiments.

Microhabitat selection at the site scale was tested in free-ranging grasshoppers and related to changing thermal quality over a daily period. Artificial warming experiments were then used to measure the temperature at which common thermoregulatory behaviours are initiated and the subsequent reductions in body temperature. Behavioural means such as timing of activity, choice of substrates with optimum surface temperatures, shade seeking and postural adjustments (e.g. stilting, vertical orientation) were found to be highly effective at maintaining preferred body temperature. The maximum voluntarily tolerated temperature (MVT) was determined to be 44C 0.4C, indicating the upper bounds of thermal flexibility in this species.

Behavioural thermoregulation effectively enables small ectotherms to regulate exposure to changing environmental temperatures and utilize the spatially and temporally heterogeneous environments they occupy. Species such as the wingless grasshopper, although adapted to cool temperate conditions, are likely to be well equipped to respond successfully to coarse scale climate change.

Item Details

Item Type:Refereed Article
Keywords:behavior, climate change, Orthoptera, adaptation
Research Division:Biological Sciences
Research Group:Zoology
Research Field:Invertebrate biology
Objective Division:Environmental Policy, Climate Change and Natural Hazards
Objective Group:Adaptation to climate change
Objective Field:Climate change adaptation measures (excl. ecosystem)
UTAS Author:Harris, RMB (Dr Rebecca Harris)
UTAS Author:McQuillan, P (Mr Peter McQuillan)
ID Code:103190
Year Published:2015
Web of Science® Times Cited:6
Deposited By:CRC-Antarctic Climate & Ecosystems
Deposited On:2015-09-24
Last Modified:2017-11-01

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