A1 Journal article (refereed)
Fluctuating temperature leads to evolution of thermal generalism and preadaptation to novel environments (2013)

Ketola, T., Mikonranta, L., Zhang, J., Saarinen, K., Örmälä, A.-M., Friman, V.-P., . . . , & Laakso, J. (2013). Fluctuating temperature leads to evolution of thermal generalism and preadaptation to novel environments. Evolution, 67 (10), 2936-2944. doi:10.1111/evo.12148

JYU authors or editors

Publication details

All authors or editors: Ketola, Tarmo; Mikonranta, Lauri; Zhang, Ji; Saarinen, Kati; Örmälä, Anni-Maria; Friman, Ville-Petri; Mappes, Johanna; Laakso, Jouni

Journal or series: Evolution

ISSN: 0014-3820

eISSN: 1558-5646

Publication year: 2013

Volume: 67

Issue number: 10

Pages range: 2936-2944

Publisher: Wiley-Blackwell Publishing Ltd.; Society for the Study of Evolution

Publication country: United States

Publication language: English

DOI: http://doi.org/10.1111/evo.12148

Persistent website address: http://onlinelibrary.wiley.com/doi/10.1111/evo.12148/abstract

Research data link: https://doi.org/10.5061/dryad.2k4vc

Open Access: Publication channel is not openly available


Environmental fluctuations can select for generalism, which is also hypothesized to increase organisms’ ability to invade novel environments. Here, we show that across a range of temperatures, opportunistic bacterial pathogen Serratia marcescens that evolved in fluctuating temperature (daily variation between 24°C and 38°C, mean 31°C) outperforms the strains that evolved in constant temperature (31°C). The growth advantage was also evident in novel environments in the presence of parasitic viruses and predatory protozoans, but less clear in the presence of stressful chemicals. Adaptation to fluctuating temperature also led to reduced virulence in Drosophila melanogaster host, which suggests that generalism can still be costly in terms of reduced fitness in other ecological contexts. While supporting the hypothesis that evolution of generalism is coupled with tolerance to several novel environments, our results also suggest that thermal fluctuations driven by the climate change could affect both species’ invasiveness and virulence.

Keywords: Drosophila melanogaster; oxidative stress; predation; virulence

Free keywords: Bacteriophage; host; invasion; PPV; Serratia marcescens; Tetrahymena themophila; virus

Contributing organizations

Ministry reporting: Yes

Reporting Year: 2013

JUFO rating: 3

Last updated on 2020-15-10 at 23:46