Life history traits, but not body size, vary systematically along latitudinal gradients on three continents in the widespread yellow dung fly

Details

Serval ID
serval:BIB_CEB4E6762271
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
Life history traits, but not body size, vary systematically along latitudinal gradients on three continents in the widespread yellow dung fly
Journal
Ecography
Author(s)
Blanckenhorn Wolf U., Bauerfeind Stephanie S., Berger David, Davidowitz Goggy, Fox Charles W., Guillaume Frédéric, Nakamura Satoshi, Nishimura Kinya, Sasaki Hitoshi, Stillwell R. Craig, Tachi Takuji, Schäfer Martin A.
ISSN
1600-0587
ISSN-L
0906-7590
Publication state
Published
Issued date
2018
Peer-reviewed
Oui
Volume
41
Number
12
Pages
2080-2091
Language
english
Abstract
Large-scale clinal variation in body size and other life-history traits is common enough to have stimulated the postulation of several eco-geographical rules. Whereas some clinal patterns are clearly adaptive, the causes of others remain unclear. We present a comprehensive intraspecific population comparison for the cosmopolitan yellow dung fly Scathophaga stercoraria (Diptera: Scathophagidae) to check for consistent world-wide patterns. Common garden assessment of various life history traits permitted continental comparison of (clinal) quantitative genetic differentiation (Qst) with putatively neutral genetic differentiation (Fst) derived from field-caught flies. Latitudinal clines in fly development time, growth rate, and overwintering propensity were consistent among North American, European and Japanese populations. Increased winter dormancy incidence and duration at higher latitude, combined with a faster growth rate and shorter development time, suggest that flies are adaptated to season length more than to temperature. The resulting body size clines, in contrast, were not very consistent; importantly, they were not negative, as expected under seasonal constraints, but flat or even positive clines. Quantitative genetic differentiation Q(ST) exceeded neutral molecular variation F-ST for most traits, suggesting that natural selection plays a consistent role in mediating global dung fly life histories. We conclude that faster growth and development in response to shorter growing seasons at higher latitudes may indirectly counteract expected direct effects of temperature on body-size, potentially resulting in flat or inconsistent body size clines in nature.
Keywords
body size, development time, diapause, Fst, geographic differentiation, genetic differentiation, growth rate, latitudinal cline, life history, Qst
Web of science
Create date
11/02/2019 8:36
Last modification date
20/08/2019 15:49
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