Eur. J. Entomol. 115: 339-353, 2018 | DOI: 10.14411/eje.2018.034

Variation in the morphology of the wings of the endangered grass-feeding butterfly Coenonympha oedippus (Lepidoptera: Nymphalidae) in response to contrasting habitatsOriginal article

Jure JUGOVIC1, Sara ZUPAN1, Elena BUŽAN1, Tatjana ČELIK2,*
1 Department of Biodiversity, Faculty of Mathematics, Natural Sciences and Information Technologies, University of Primorska, 6000 Koper, Slovenia; e-mail: jure.jugovic@upr.si, sara.zupan@upr.si, elena.buzan@upr.si
2 Research Centre of the Slovenian Academy of Sciences and Arts, Novi trg 2, 1000 Ljubljana, Slovenia; e-mail: tcelik@zrc-sazu.si

At the southern limit of its range the endangered butterfly Coenonympha oedippus inhabits grasslands (wet, dry) that differ significantly in the abundance of its larval hostplants (wet > dry) and mean annual air temperature (wet < dry). We determined the difference in the wing morphology of individuals in the two contrasting habitats to test whether and how traits associated with wing size, shape and eye like spots vary in the sexes and two ecotypes. We show that sexual dimorphism follows the same (wing size and shape, number of eyespots on forewing) or different (relative area of eyespots on hindwings) patterns in the two contrasting habitats. Irrespective of ecotype, females had larger, longer and narrower wings, and more forewing eyespots than males. Sexual dimorphism in the relative area of eyespots on hindwing was female-biased in the wet, but male-biased in the dry ecotype. Ecotype dimorphism in wing size and the relative area of eyespots on the hindwing is best explained by mean annual air temperature and abundance of host-plants. While ecotype dimorphism in wing size did not differ between sexes, neither in direction (wet > dry) or in degree, in the two sexes the relative area of eyespots on hindwing had opposite patterns (males: dry > wet; females: wet > dry) and was more pronounced in males than in females. The differences in wing shape between ecotypes were detected only in the hindwings of males, with more rounded apex in the dry than in the wet ecotype. We discuss the life-history traits, behavioural strategies and selection mechanisms, which largely account for the sex- and ecotype-specific variation in wing morphology.

Keywords: Lepidoptera, Nymphalidae, butterfly, Coenonympha oedippus, False Ringlet, wing, adaptation, classical morphometrics, geometric morphometrics, environmental heterogeneity

Received: October 25, 2017; Revised: June 6, 2018; Accepted: June 6, 2018; Published online: July 17, 2018  Show citation

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JUGOVIC, J., ZUPAN, S., BUŽAN, E., & ČELIK, T. (2018). Variation in the morphology of the wings of the endangered grass-feeding butterfly Coenonympha oedippus (Lepidoptera: Nymphalidae) in response to contrasting habitats. EJE, 115, Article 339-353. https://doi.org/10.14411/eje.2018.034
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