Climate change-driven elevational changes among boreal nocturnal moths
|Author:||Keret, Netta M.1; Mutanen, Marko J.1; Orell, Markku I.1;|
1Ecology and Genetics Research Unit, University of Oulu, PO Box 3000, FI-90014, Oulu, Finland
2Present address: Kaitoväylä 25 A 6, FI-90570, Oulu, Finland
|Online Access:||PDF Full Text (PDF, 0.8 MB)|
|Persistent link:|| http://urn.fi/urn:nbn:fi-fe2020051229486
|Publish Date:|| 2020-05-12
Climate change has shifted geographical ranges of species northwards or to higher altitudes on elevational gradients. These changes have been associated with increases in ambient temperatures. For ectotherms in seasonal environments, however, life history theory relies largely on the length of summer, which varies somewhat independently of ambient temperature per se. Extension of summer reduces seasonal time constraints and enables species to establish in new areas as a result of over-wintering stage reaching in due time. The reduction of time constraints is also predicted to prolong organisms’ breeding season when reproductive potential is under selection. We studied temporal change in the summer length and its effect on species’ performance by combining long-term data on the occurrence and abundance of nocturnal moths with weather conditions in a boreal location at Värriötunturi fell in NE Finland. We found that summers have lengthened on average 5 days per decade from the late 1970s, profoundly due to increasing delays in the onset of winters. Moth abundance increased with increasing season length a year before. Most of the species occurrences expanded upwards in elevation. Moth communities in low elevation pine heath forest and middle elevation mountain birch forest have become inseparable. Yet, the flight periods have remained unchanged, probably due to unpredictable variation in proximate conditions (weather) that hinders life histories from selection. We conclude that climate change-driven changes in the season length have potential to affect species’ ranges and affect the structure of insect assemblages, which may contribute to alteration of ecosystem-level processes.
|Pages:||1085 - 1098|
|Type of Publication:||
A1 Journal article – refereed
|Field of Science:||
1181 Ecology, evolutionary biology
Open access funding provided by University of Oulu including Oulu University Hospital. Data analysis was supported by strategic research funding from the Kvantum Institute of Oulu University (PMV), the Academy of Finland (#258638: MIO and PMV; #277984: MJM), the Thule Institute of Oulu University (NMK) and the Societas Pro Fauna et Flora Fennica (NMK).
|Academy of Finland Grant Number:||
258638 (Academy of Finland Funding decision)
277984 (Academy of Finland Funding decision)
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