Do group dynamics affect colour morph clines during a range shift?

L T Lancaster, R Y Dudaniec, B Hansson, Erik Svensson

Research output: Contribution to journalArticlepeer-review


Species exhibiting colour polymorphism are thought to have an ecological advantage at the landscape scale, because spatial segregation of alternatively adapted ecotypes into diverse habitats can increase the species' niche breadth and thus confer greater geographic range size. However, morph frequencies are also influenced by intrapopulational processes such as frequency- or density-dependent social interactions. To identify how social feedback may affect clinal variation in morph frequencies, we investigated reciprocal interactions between morph-specific thermal tolerance, local climatic conditions and social environments, in the context of a colour-morph frequency cline associated with a recent range expansion in blue-tailed damselflies (Ischnura elegans) in Sweden. Cold tolerances of gynochromes (female-like female morph) were positively correlated with local gynochrome frequencies, suggesting a positive frequency-dependent fitness benefit. In contrast, androchrome (male-mimic female morph) cold tolerances were improved following recent exposure to cold weather, suggesting a beneficial environmental acclimation effect. Thus, according to an environment-matching hypothesis for clinal variation, androchrome frequencies should therefore increase towards the (cooler) range limit. In contrast to this prediction, gynochrome frequencies increased at the expanding range limit, consistent with a positive frequency-dependent social feedback that is beneficial when invading novel climates. Our results suggest that when phenotypes or fitnesses are affected by interactions with conspecifics, beneficial social effects on environmental tolerances may (i) facilitate range shifts, and (ii) reverse or counteract typical patterns of intraspecific interactions and environment-matching clines observed in stable populations observed over broader geographic scales.

Original languageEnglish
Pages (from-to)728-737
Number of pages10
JournalJournal of evolutionary biology
Issue number4
Publication statusPublished - 2017 Jan 6

Subject classification (UKÄ)

  • Ecology
  • Evolutionary Biology


  • Animals
  • Color
  • Female
  • Male
  • Odonata/anatomy & histology
  • Phenotype
  • Polymorphism, Genetic
  • Population Dynamics
  • Sweden


Dive into the research topics of 'Do group dynamics affect colour morph clines during a range shift?'. Together they form a unique fingerprint.

Cite this