University of Oulu

Tyukmaeva, V., Lankinen, P., Kinnunen, J., Kauranen, H. and Hoikkala, A. (2020), Latitudinal clines in the timing and temperature‐sensitivity of photoperiodic reproductive diapause in Drosophila montana. Ecography, 43: 759-768. doi:10.1111/ecog.04892

Latitudinal clines in the timing and temperature‐sensitivity of photoperiodic reproductive diapause in Drosophila montana

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Author: Tyukmaeva, Venera1; Lankinen, Pekka2; Kinnunen, Johanna1;
Organizations: 1Dept of Biological and Environmental Science, Univ. of Jyväskylä, Jyväskylä, Finland
2Dept of Ecology and Genetics, Univ. of Oulu, Oulu, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 1.3 MB)
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Language: English
Published: John Wiley & Sons, 2020
Publish Date: 2020-06-29


Reproductive diapause is a primary mechanism used by arthropods to synchronize their life cycle with seasonal changes in temperate regions. Our study species, Drosophila montana, represents the northern insect species where flies enter reproductive diapause under short day conditions and where the precise timing of diapause is crucial for both survival and offspring production. We have studied clinal variation in the critical day length for female diapause induction (CDL) and their overall susceptibility to enter diapause (diapause incidence), as well as the temperature sensitivity of these traits. The study was performed using multiple strains from four latitudinal clines of the species — short clines in Finland and Alaska and long clines in the Rocky Mountains and the western coast of North America — and from one population in Kamchatka, Russia. CDL showed strong latitudinal clines on both continents, decreasing by one hour per five degrees decline in latitude, on average. CDL also decreased in all populations along with an increase in fly rearing temperature postponing the diapause to later calendar time, the effects of temperature being stronger in southern than in northern population. Female diapause incidence was close to 100% under short day/low temperature conditions in all populations, but decreased below 50% even under short days in 19°C in the southern North American western coast populations and in 22°C in most populations. Comparing a diversity of climatic data for the studied populations showed that while CDL is under a tight photoperiodic regulation linked with latitude, its length depends also on climatic factors determining the growing season length. Overall, the study deepens our understanding of how spatial and environmental parameters affect the seasonal timing of an important biological event, reproductive diapause and helps to estimate the evolutionary potential of insect populations to survive in changing climatic conditions.

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Series: Ecography
ISSN: 0906-7590
ISSN-E: 1600-0587
ISSN-L: 0906-7590
Volume: 43
Issue: 5
Pages: 759 - 768
DOI: 10.1111/ecog.04892
Type of Publication: A1 Journal article – refereed
Field of Science: 1181 Ecology, evolutionary biology
1184 Genetics, developmental biology, physiology
Funding: This study was supported by the Academy of Finland to AH, project 267244.
Copyright information: © 2020 The Authors. Ecography published by John Wiley & Sons Ltd on behalf of Nordic Society Oikos. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.