Volume 49, Issue 7 pp. 1234-1247
RESEARCH ARTICLE

Same place, different stories: Disparate evolutionary trends of mygalomorph spiders from the Peripampasic orogenic arc

Arnau Calatayud-Mascarell

Arnau Calatayud-Mascarell

Department of Evolutionary Biology, Ecology and Environmental Sciences & Biodiversity Research Institute (IRBio), Universitat de Barcelona, Barcelona, Spain

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Nelson Ferretti

Corresponding Author

Nelson Ferretti

Center of Renewable Natural Resources of the Semiarid Area (CERZOS-UNS, CONICET), Bahía Blanca, Argentina

Department of Biology, Biochemistry and Pharmacy, Universidad Nacional del Sur, San Juan, Bahía Blanca, Argentina

Correspondence

Nelson Ferretti, Center of Renewable Natural Resources of the Semiarid Area (CERZOS-UNS, CONICET), Camino la Carrindanga Km.7, Bahía Blanca (8000), Buenos Aires, Argentina.

Email: [email protected]

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Alba Enguídanos

Alba Enguídanos

Department of Evolutionary Biology, Ecology and Environmental Sciences & Biodiversity Research Institute (IRBio), Universitat de Barcelona, Barcelona, Spain

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Miquel A. Arnedo

Miquel A. Arnedo

Department of Evolutionary Biology, Ecology and Environmental Sciences & Biodiversity Research Institute (IRBio), Universitat de Barcelona, Barcelona, Spain

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First published: 18 May 2022

Arnau Calatayud-Mascarell and Nelson Ferretti should be considered joint first author.

Handling Editor: Paula Arribas

Abstract

Aim

Comparative phylogeography aims to unravel similarities in the population structure and evolutionary processes undergone by co-distributed taxa, under the assumption that they will have experienced the same geoclimatic events. However, small differences in functional traits, particularly those related to dispersal abilities, may translate into incongruent evolutionary histories. Here, we used a sequence target multi-locus approach to infer and compare the phylogeographical patterns of three sympatric mygalomorph spiders in the Argentinean Peripampasic orogenic arc.

Location

The mountainous systems of central and northern Argentina.

Taxon

Acanthogonatus centralis, Grammostola vachoni and Plesiopelma longisternale (Araneae: Mygalomorphae).

Methods

We inferred mitochondrial gene trees (16S + L1 + nad1) and nuclear (ITS2) networks of three species of mygalomorph spiders from 159 individuals using Bayesian and Maximum likelihood approaches, and estimated divergence times in a Bayesian framework. Based on our time-stamped gene trees, we reconstructed ancestral areas using the Bayesian Binary MCMC method.

Results

Deeply divergent and highly geographically structured populations, isolated since the Late Miocene to mid Pliocene, were obtained in the pycnothelid Acanthogonatus centralis. Conversely, the theraphosids Plesiopelma longisternale and Grammostola vachoni showed slightly divergent and poorly geographically structured populations, tracing back to the Late Pliocene to Early Pleistocene.

Main conclusions

We propose that differences in dispersion rates and time of colonization between the theraphosids and the pycnothelid species led to divergent lineage history despite common environmental conditions. We corroborate the key role played by the Plio-Pleistocene geoclimatic events in shaping the present-day diversity of mygalomorph spiders along the Peripampasic orogenic arc. Additionally, we uncovered potentially overlooked species diversity within G. vachoni.

CONFLICT OF INTEREST

Authors declare no conflict of interest.

DATA AVAILABILITY STATEMENT

The data that support the findings of this study are available on Dryad (doi:10.5061/dryad.h18931znb). Sequence data are openly available at GenBank (www.ncbi.nlm.nih.gov/genbank/) and sequences ids are shown in Table S1.1.

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