scholarly journals Compensating for climate change–induced cue‐environment mismatches: evidence for contemporary evolution of a photoperiodic reaction norm in Colias butterflies

2020 ◽  
Vol 23 (7) ◽  
pp. 1129-1136 ◽  
Author(s):  
Matthew E. Nielsen ◽  
Joel G. Kingsolver
Keyword(s):  
Climate Change ◽  
Reaction Norm ◽  
Contemporary Evolution ◽  
Photoperiodic Reaction

scholarly journals Diapause is not selected as a bet-hedging strategy in insects: a meta-analysis of reaction norm shapes

2019 ◽  
Author(s):  
Jens Joschinski ◽  
Dries Bonte
Keyword(s):  
Climate Change ◽  
Phenotypic Plasticity ◽  
Meta Analysis ◽  
Reaction Norm ◽  
Geographic Range ◽  
Bet Hedging ◽  
Hedging Strategy ◽  
Apparent Lack ◽  
Environmental Predictability ◽  
Hedging Strategies

AbstractMany organisms escape from lethal climatological conditions by entering a resistant resting stage called diapause, which needs to be optimally timed with seasonal change. As climate change exerts selection pressure on phenology, the evolution of mean diapause timing, but also of phenotypic plasticity and bet-hedging strategies is expected. Especially the latter as a strategy to cope with unpredictability is little considered in the context of climate change.Contemporary patterns of phenological strategies across a geographic range may provide information about their evolvability. We thus extracted 458 diapause reaction norms from 60 studies. First, we correlated mean diapause timing with mean winter onset. Then we partitioned the reaction norm variance into a temporal component (phenotypic plasticity) and among-offspring variance (diversified bet-hedging) and correlated this variance composition with predictability of winter onset. Mean diapause timing correlated reasonably well with mean winter onset, except for populations at high latitudes, which apparently failed to track early onsets. Variance among offspring was, however, limited and correlated only weakly with environmental predictability, indicating little scope for bet-hedging. The apparent lack of phenological bet-hedging strategies may pose a risk in a less predictable climate, but we also highlight the need for more data on alternative strategies.

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