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Phylogenetics and population structure of the steppe species Hycleus polymorphus (Coleoptera: Meloidae: Mylabrini) reveal multiple refugia in Mediterranean mountain ranges
- Publication Year :
- 2020
-
Abstract
- Many continental species distributed in the Eurasian steppe occur as relict populations in the mountains of Western Europe. Their biogeographical responses to Quaternary climate changes have been poorly studied; however, they could have responded as cold-adapted species. We investigated the biogeographic history of a steppe beetle, Hycleus polymorphus, using mitochondrial and nuclear DNA sequences (COI, CAD, ITS2), and species distribution modelling (SDM) under present and past bioclimatic envelopes. We first performed a phylogenetic assessment to define species boundaries within the H. polymorphus species group. Specimens previously treated as Hycleus humerosus on morphological grounds are assigned to H. polymorphus, and those identified as Hycleus zebraeus assigned to Hycleus atratus. ITS2 data analyses revealed a strong phylogeographical structure of H. polymorphus populations, with four haplogroups corresponding to the (i) Italian Alps, (ii) French Alps and Pyrenees, (iii) South Balkan and Pontic mountains, and (iv) North Dinaric Alps. Based on these analyses and the SDM, we propose that during a glacial period, following the spread of steppic habitat, H. polymorphus underwent a range expansion from Asia to South-West Europe. Within the Mediterranean area, during the last interglacial the climatic suitability for the species was limited to mountains that acted as refugia and prompted allopatric divergence into four main lineages.
- Subjects :
- 0106 biological sciences
Mediterranean climate
Steppe
Species Distribution Models
Population structure
ITS2
phylogeography
010603 evolutionary biology
01 natural sciences
COI
03 medical and health sciences
Phylogenetics
CAD
Ecology, Evolution, Behavior and Systematics
030304 developmental biology
0303 health sciences
geography
geography.geographical_feature_category
biology
Ecology
Mediterranean mountains
Pleistocene climate oscillations
biology.organism_classification
CAD, COI, cold-adapted species, continental elements, fragmented distribution, ITS2, Mediterranean mountains, phylogeography, Pleistocene climate oscillations, Species Distribution Model
Polymorphus
Phylogeography
continental elements
cold-adapted species
fragmented distribution
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....744043b86b3a4497aea9ed97e580c07a