Animal Biodiversity and Conservation. Volum 49.2 (2026) Pàgines: e0018-

Wide range, narrow signal: Low mitochondrial differentiation in the shrub ecotone specialist Excentricus planicornis (Herrich-Schäffer, 1836) (Heteroptera: Miridae)

Klimm, F. S., Raupach, M. J., Mandery, K., Römer, J., Krauss, J.

DOI: https://doi.org/10.32800/abc.2026.49.0018

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Resum

Excentricus planicornis is a highly specialised mirid true bug associated with shrub ecotones where it feeds on a narrow set of wild rose species. Its highly fragmented distribution and presumed low dispersal ability make it an interesting species in which to study phylogeographic structure. We analysed mitochondrial cytochrome c oxidase subunit I (COI) sequences from 96 specimens sampled across seven regions in Europe to assess genetic differentiation. Genetic diversity was low, with intraspecific Kimura-2-parameter distances ranging from 0 to 0.01 %. All sequences clustered into a single BIN, and a star-like haplotype network comprising six haplotypes indicated a recent population expansion, possibly following post-glacial recolonisation. The widespread occurrence of a dominant haplotype across Europe suggests ongoing or recent gene flow, contrasting with our expectation based on the species ecology and patchy host plant distribution. Although high-elevation and peripheral populations might still be vulnerable, E. planicornis overall seems to be a resilient specialist capable of persisting in highly fragmented landscapes.

Paraules clau

Excentricus planicornis, COI Barcoding, Habitat fragmentation, Genetic diversity, Haplotype network, Shrub ecotones

Cita

Klimm, F. S., Raupach, M. J., Mandery, K., Römer, J., Krauss, J., 2026. Wide range, narrow signal: Low mitochondrial differentiation in the shrub ecotone specialist Excentricus planicornis (Herrich-Schäffer, 1836) (Heteroptera: Miridae). Animal Biodiversity and Conservation, 49: e0018-, DOI: https://doi.org/10.32800/abc.2026.49.0018