Life stage-related differences in hardening and acclimation of thermal tolerance traits in the kelp fly, Paractora dreuxi (Diptera, Helcomyzidae)

It is widely appreciated that physiological tolerances differ between life stages. However, few studies have examined stage-related differences in acclimation and hardening. In addition, the behavioural responses involved in determining the form and extent of the short-term phenotypic response are r...

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Bibliographic Details
Published in:Journal of Insect Physiology
Main Authors: Marais E., Terblanche J.S., Chown S.L.
Format: Article in Journal/Newspaper
Language:unknown
Published: 2009
Subjects:
acclimation
age-related difference
behavioral response
developmental stage
fly
hardening
heat shock
ontogeny
phenotypic plasticity
temperature tolerance
acclimatization
animal
article
Indian Ocean
larva
life cycle
physiology
South Africa
survival
temperature
Animals
Diptera
Indian Ocean Islands
Life Cycle Stages
Survival Analysis
Coelopidae
Helcomyzidae
Paractora dreuxi
Antarctic
Indian
Antarc*
Online Access:http://hdl.handle.net/10019.1/11275
https://doi.org/10.1016/j.jinsphys.2008.11.016
Description
Summary:It is widely appreciated that physiological tolerances differ between life stages. However, few studies have examined stage-related differences in acclimation and hardening. In addition, the behavioural responses involved in determining the form and extent of the short-term phenotypic response are rarely considered. Here, we investigate life stage differences in the acclimation and hardening responses of the survival of a standard heat shock (SHS) and standard low temperature (or cold) shock (SCS), and the crystallization temperature (or supercooling point, SCP) of adults and larvae of the sub-Antarctic kelp fly, Paractora dreuxi. These stages live in the same habitat, but differ substantially in their mobility and thus environmental temperatures experienced. Results showed that neither acclimation nor hardening affected the lower lethal limits in larvae or adults. Adults showed an increase in survival of upper lethal limits after low temperature acclimation, whilst larvae showed a consistent lack of response. The acclimation × hardening interaction significantly affected the SCP in adults, but no response to either acclimation or hardening was found in the larvae. This study further demonstrates the complexities of thermal tolerance responses in P. dreuxi. © 2009 Elsevier Ltd. All rights reserved. Article

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