A1 Journal article (refereed)
Latitudinal clines in the timing and temperature‐sensitivity of photoperiodic reproductive diapause in Drosophila montana (2020)

Tyukmaeva, V., Lankinen, P., Kinnunen, J., Kauranen, H., & Hoikkala, A. (2020). Latitudinal clines in the timing and temperature‐sensitivity of photoperiodic reproductive diapause in Drosophila montana. Ecography, 43(5), 759-768. https://doi.org/10.1111/ecog.04892

JYU authors or editors

Tyukmaeva, Venera
Kinnunen, Johanna
Kauranen, Hannele
Hoikkala, Anneli

Publication details

All authors or editors: Tyukmaeva, Venera; Lankinen, Pekka; Kinnunen, Johanna; Kauranen, Hannele; Hoikkala, Anneli

Journal or series: Ecography

ISSN: 0906-7590

eISSN: 1600-0587

Publication year: 2020

Volume: 43

Issue number: 5

Pages range: 759-768

Publisher: John Wiley & Sons

Publication country: United Kingdom

Publication language: English

DOI: https://doi.org/10.1111/ecog.04892

Research data link: https://doi.org/10.5061/dryad.59zw3r241

Publication open access: Openly available

Publication channel open access: Open Access channel

Publication is parallel published (JYX): https://jyx.jyu.fi/handle/123456789/67883

Abstract

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.

Keywords: adaptation (change); climate changes; wintering; phenology

Free keywords: clinal variation; critical photoperiod

Fields of science: