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- Title
Dynamics of colour polymorphism in a changing environment: fire melanism and then what?
- Authors
Karlsson, Magnus; Caesar, Sofia; Ahnesjö, Jonas; Forsman, Anders; Schaefer, Matthias
- Abstract
Studies of whether disturbance events are associated with the changing genetic compositions of natural populations may provide insights into the importance of local selection events in maintaining diversity, and might inform plans for the conservation and protection of that diversity. We examined the dynamics of a colour pattern polymorphism in a natural population of pygmy grasshoppers Tetrix subulata (Orthoptera: Tetrigidae) inhabiting a previously burnt clear-cut area. Data on morph frequencies for wild-caught and captive-reared individuals indicated that the initial dominance of black phenotypes following the fire event was followed by an increased diversity of the polymorphism. This was manifested as the appearance of a novel morph, a decreased incidence of the black morph, and a more even distribution of individuals across alternative morphs following the recurrence of vegetation. We also found that the colour patterns of captive-reared individuals resembled those of their parents and that the degree of within-clutch diversity increased between generations. Our comparisons of morph frequencies across generations and between environments within generations point to a genetic determination of colour pattern, and indicate that the polymorphism is influenced more strongly by selection than by plasticity or migration.
- Subjects
POLYMORPHISM (Zoology); MELANISM; ANIMAL coloration; INSECTS; GENETIC polymorphisms; POPULATION genetics
- Publication
Oecologia, 2007, Vol 154, Issue 4, p715
- ISSN
0029-8549
- Publication type
Article
- DOI
10.1007/s00442-007-0876-y