Historical climate change dynamics facilitated speciation and hybridization between highland and lowland species of Baripus ground beetles from Patagonia

OLAVE MELISA; GRIOTTI, MARIANA; CARRARA RODOLFO; FRANCHINI P; MAYER A; ROIG-JUÑENT, SERGIO A.

Bulletin of the Society of Systematic Biologists

Ohio State University Libraries

Lugar: Ohio; Año: 2023

2768-0819

Oneof the largest beetles of Patagonia, Baripus (Cardiophthalmus),includes 20 currently described species. Its distribution ranges fromthe tip of Patagonia, on Tierra del Fuego Island, to isolated patchesalong the Andes and Extrandes mountains in northern Patagonia on thePayunia at >3000 m elevation. Here, using RADseq data, evidence isfound of mixed ancestry in different lineages. Phylogenetic networkreconstruction shows two hybridizing edges betweenlowland and highland species.Using environmental niche modeling, we show changes in geographicdistribution of potential niches of species during the last glacialmaximum compared to their present distribution. Increasing potentialniche overlap among different species pairs possibly explains howlineages came into secondary contact, supporting the hypothesis ofhybridization. In addition, morphological evolution is studied usinggeometric morphometrics on the network and evidence of transgressiveevolution has been found involving the pronotum shape, as well ashighland/lowland habitat preferences. Finally, based on genomics andmorphological data and using an integrative coalescent-based speciesdelimitation approach, the separate evolution of two lineages inearly stages of speciation is found. Taken together, dynamics ofdiversification of Baripusbeetles in both space and time are discussed.p { margin-bottom: 0.25cm; border: none; padding: 0cm; direction: ltr; color: #000000; line-height: 120%; text-align: left; orphans: 2; widows: 2; text-decoration: none }p.western { font-family: "Times New Roman", serif }p.cjk { font-family: "Arial Unicode MS" }p.ctl { font-family: "Arial Unicode MS" }a:link { color: #0563c1 }