z-logo
open-access-imgOpen Access
Life history traits, but not body size, vary systematically along latitudinal gradients on three continents in the widespread yellow dung fly
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.
Publication year - 2018
Publication title -
ecography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.973
H-Index - 128
eISSN - 1600-0587
pISSN - 0906-7590
DOI - 10.1111/ecog.03752
Subject(s) - biology , bergmann's rule , cline (biology) , ecology , overwintering , intraspecific competition , latitude , life history theory , population , life history , demography , geography , geodesy , sociology
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.

The content you want is available to Zendy users.

Already have an account? Click here to sign in.
Having issues? You can contact us here