Abstract
Climate is often considered to be an important, but indirect driver of speciation. Indeed, environmental factors may contribute to the formation of biodiversity, but to date this crucial relationship remains largely unexplored. Here we investigate the possible role of climate, geological factors, and biogeographical processes in the formation of a freshwater insect species group, the Chaetopteryx rugulosa species complex (Trichoptera) in the Western Balkans. We used multi-locus DNA sequence data to establish a dated phylogenetic hypothesis for the group. The comparison of the dated phylogeny with the geological history of the Western Balkans shows that lineage formation coincided with major past Earth surface and climatic events in the region. By reconstructing present-day habitat conditions (climate, bedrock geology), we show that the lineages of C. rugulosa species complex have distinct climatic but not bedrock geological niches. Without exception, all splits associated with Pliocene/Pleistocene transition led to independent, parallel split into ‘warm’ and ‘cold’ sister lineages. This indicates a non-random diversification on the C. rugulosa species complex associated with late Pliocene climate in the region. We interpreted the results as the diversification of the species complex were mainly driven by ecological diversification linked to past climate change, along with geographical isolation.
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Acknowledgements
We are grateful to János Oláh, Hans Malicky, Ákos Uherkovich, Sára Nógrádi, Ana Previšić, Gorazd Urbanic, Marco Valle, Omar Lodovici, Antun Delić, Iva Mihoci, Aleksandar Popijač, and Matija Bučar who provided us with valuable specimens, location data, and general advice. We express our gratitude to Xin Zhou for handling the mitochondrial barcoding of our specimens within the Barcoding of Life initiative. I Sz was partially funded through an incoming research grant of the Biodiversity and Climate Research Centre in the frame of the research funding program Landes-Offensive zur Entwicklung Wissenschaftlich-ökonomischer Exzellenz (LOEWE) of Hesse’s Ministry of Higher Education, Research, and the Arts. MB and SP are funded by the research funding program Landes-Offensive zur Entwicklung Wissenschaftlich-ökonomischer Exzellenz (LOEWE) of Hesse’s Ministry of Higher Education, Research, and the Arts, as well as the Fonds zur Förderung der wissenschaftlichen Forschung (FWF) Grant P 23687-B17.
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Handling editor: Luigi Naselli-Flores
Steffen U. Pauls and Miklós Bálint have equally contributed to this work.
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Table S1
Collection data, Genbank and Barcoding of Life sequence accession codes and collector information of Chaetopteryx rugulosa species complex and outgroup specimens. Supplementary material 1 (PDF 224 kb)
Table S2
Locality data of all populations within C. rugulosa species complex. These localities were used to compile the climatic dataset. The table includes the bedrock geological characteristics of the habitats. Abbreviations: fgsed - Fine-grained sedimentary rocks, sand - Sandstone, lime - Limestone, dolomite, coal - Coal, volc – Volcanic and volcaniclastic rocks, felig - Felsic igneous rocks, intig - Intermediate igneous rocks, mafig - Mafic igneous rocks, mbas - Metapelitic rocks, mpel - Metabasic rocks. Supplementary material 2 (PDF 230 kb)
Table S3
Climatic data layers used to infer the climatic conditions in the habitats of populations within C. rugulosa species complex. Supplementary material 3 (PDF 139 kb)
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Szivák, I., Mikes, T., Szalontai, B. et al. Ecological divergence of Chaetopteryx rugulosa species complex (Insecta, Trichoptera) linked to climatic niche diversification. Hydrobiologia 794, 31–47 (2017). https://doi.org/10.1007/s10750-016-3068-0
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DOI: https://doi.org/10.1007/s10750-016-3068-0