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The effect of fluctuating temperatures during development on fitness-related traits of Scatophaga stercoraria (Diptera: Scathophagidae)


Kjærsgaard, Anders; Pertoldi, Cino; Loeschcke, Volker; Blanckenhorn, Wolf U (2013). The effect of fluctuating temperatures during development on fitness-related traits of Scatophaga stercoraria (Diptera: Scathophagidae). Environmental Entomology, 42(5):1069-1078.

Abstract

Development of ectotherms is highly temperature dependent. Studies using variable thermal environments can improve ecological relevance of data because organisms naturally face day-to-day stochastic temperature ßuctuations as well as seasonal changes in the amplitude of such daily ßuctuations. The objective of this study was to investigate if, and to what extent, the use of constant temperatures is justiÞed in studies of the model species, yellow dung ßy, Scatophaga stercoraria (L.). We examined the effect of temperature ßuctuation on the expression of several life history traits and the effect on subsequent adult longevity. We used two ßuctuating temperature treatments with the same mean but different amplitudes (15/21°C, 12/24°C; 12/12 h), and three constant temperature treatments spanning the wide temperature range faced in the wild (12, 18, and 24°C). Large temperature ßuctuation was mostly detrimental (lower juvenile survival, slower growth, smaller body size, and longer development), whereas moderate temperature ßuctuation usually gave responses similar to the constant regime.Whendeveloping in ßuctuating temperatures, adult longevity (no effect), body size (lower), and wing shape (narrower wings) deviated from the expectations based on the constant temperature reaction norms, presumably because of acclimation responses. Contrary to some studies no obvious beneÞcial effects of moderate temperature ßuctuation were observed. Instead, yellow dung ßies seem to canalize development in the face of temperature ßuctuation up to a point when detrimental effects become unavoidable. The relatively greater effects of extreme constant developmental temperatures question their biological relevance in experiments.

Abstract

Development of ectotherms is highly temperature dependent. Studies using variable thermal environments can improve ecological relevance of data because organisms naturally face day-to-day stochastic temperature ßuctuations as well as seasonal changes in the amplitude of such daily ßuctuations. The objective of this study was to investigate if, and to what extent, the use of constant temperatures is justiÞed in studies of the model species, yellow dung ßy, Scatophaga stercoraria (L.). We examined the effect of temperature ßuctuation on the expression of several life history traits and the effect on subsequent adult longevity. We used two ßuctuating temperature treatments with the same mean but different amplitudes (15/21°C, 12/24°C; 12/12 h), and three constant temperature treatments spanning the wide temperature range faced in the wild (12, 18, and 24°C). Large temperature ßuctuation was mostly detrimental (lower juvenile survival, slower growth, smaller body size, and longer development), whereas moderate temperature ßuctuation usually gave responses similar to the constant regime.Whendeveloping in ßuctuating temperatures, adult longevity (no effect), body size (lower), and wing shape (narrower wings) deviated from the expectations based on the constant temperature reaction norms, presumably because of acclimation responses. Contrary to some studies no obvious beneÞcial effects of moderate temperature ßuctuation were observed. Instead, yellow dung ßies seem to canalize development in the face of temperature ßuctuation up to a point when detrimental effects become unavoidable. The relatively greater effects of extreme constant developmental temperatures question their biological relevance in experiments.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Institute of Evolutionary Biology and Environmental Studies
Dewey Decimal Classification:570 Life sciences; biology
590 Animals (Zoology)
Language:English
Date:2013
Deposited On:11 Dec 2013 12:51
Last Modified:08 Dec 2017 00:46
Publisher:Entomological Society of America
ISSN:0046-225X
Publisher DOI:https://doi.org/10.1603/EN13074

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