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Reticulate Evolutionary History in a Recent Radiation of Montane bioRxiv preprint doi: https://doi.org/10.1101/2021.01.12.426362; this version posted January 13, 2021. The copyright holder for this preprint (which was not certified by peer review) is the author/funder. All rights reserved. No reuse allowed without permission. 1 Reticulate Evolutionary History in a Recent Radiation of Montane 2 Grasshoppers Revealed by Genomic Data 3 4 VANINA TONZO1, ADRIÀ BELLVERT2 AND JOAQUÍN ORTEGO1 5 6 1 Department of Integrative Ecology, Estación Biológica de Doñana (EBD-CSIC); Avda. 7 Américo Vespucio, 26 – 41092; Seville, Spain 8 2 Department of Evolutionary Biology, Ecology and Environmental Sciences, and 9 Biodiversity Research Institute (IRBio), Universitat de Barcelona; Av. Diagonal, 643 – 10 08028; Barcelona, Spain 11 12 13 Author for correspondence: 14 Vanina Tonzo 15 Estación Biológica de Doñana, EBD-CSIC, 16 Avda. Américo Vespucio 26, E-41092 Seville, Spain 17 E-mail: [email protected] 18 Phone: +34 954 232 340 19 20 21 22 Running title: Reticulate evolution in a grasshopper radiation bioRxiv preprint doi: https://doi.org/10.1101/2021.01.12.426362; this version posted January 13, 2021. The copyright holder for this preprint (which was not certified by peer review) is the author/funder. All rights reserved. No reuse allowed without permission. 23 Abstract 24 Inferring the ecological and evolutionary processes underlying lineage and phenotypic 25 diversification is of paramount importance to shed light on the origin of contemporary 26 patterns of biological diversity. However, reconstructing phylogenetic relationships in 27 recent evolutionary radiations represents a major challenge due to the frequent co- 28 occurrence of incomplete lineage sorting and introgression. In this study, we combined 29 high throughput sequence data (ddRADseq), geometric morphometric information, 30 and novel phylogenetic inference methods that explicitly account for gene flow to infer 31 the evolutionary relationships and the timing and mode of diversification in a complex 32 of Ibero-Maghrebian montane grasshoppers of the subgenus Dreuxius (genus 33 Omocestus). Our analyses supported the phenotypic distinctiveness of most sister 34 taxa, two events of historical introgression involving lineages at different stages of the 35 diversification continuum, and the recent Pleistocene origin (< 1 Ma) of the complex. 36 Phylogenetic analyses did not recover the reciprocal monophyly of taxa from Iberia 37 and northwestern Africa, supporting overseas migration between the two continents 38 during the Pleistocene. Collectively, these results indicate that periods of isolation and 39 secondary contact linked to Pleistocene glacial cycles likely contributed to both 40 allopatric speciation and post divergence gene flow in the complex. This study 41 exemplifies how the integration of multiple lines of evidence can help to reconstruct 42 complex histories of reticulated evolution and highlights the important role of 43 Quaternary climatic oscillations as a diversification engine in the Ibero-Maghrebian 44 biodiversity hotspot. 45 Keywords: allopatric speciation, introgression, phenotypic divergence, Pleistocene 46 radiations, reticulate evolution bioRxiv preprint doi: https://doi.org/10.1101/2021.01.12.426362; this version posted January 13, 2021. The copyright holder for this preprint (which was not certified by peer review) is the author/funder. All rights reserved. No reuse allowed without permission. 47 INTRODUCTION 48 Recent evolutionary radiations have traditionally received much attention because the 49 signatures of speciation events have not been fully erased by time and, thus, provide 50 the potential to infer processes from fine-scale patterns of genetic and phenotypic 51 variation (Shaw and Danley 2003; Shaffer and Thomson 2007; Knowles and Chan 52 2008). Phylogenies provide essential tools to infer the processes responsible for 53 speciation, investigate trait evolution, and discern among alternative biogeographic 54 scenarios (Barraclough et al. 1998; Knowles and Chan 2008). Inferring the mode and 55 timing of speciation is crucial to reconstruct the diversification process and unravel the 56 origin of contemporary patterns of biological diversity. However, reconstructing 57 phylogenetic relationships among recently diverged species can be extremely 58 challenging. One of the main issues is the frequent co-occurrence of incomplete 59 lineage sorting and introgression (Maddison 1997; Nichols 2001; Edwards 2009). 60 Although phylogenetic relationships among species have been typically represented as 61 bifurcating branches (Haeckel 1866; Felsenstein 2004), which implicitly assumes that 62 diversification occurred without reticulation (Coyne and Orr 2004; Mallet 2007), there 63 are multiples examples of gene flow among independently evolving taxa (Feder et al. 64 2012; Harrison and Larson 2014; Burbrink and Gehara 2018; Blair et al. 2019). Thus, 65 failing to account for post-divergence gene flow when estimating evolutionary 66 processes may produce statistical inconsistencies, incorrect phylogenies, inaccurate 67 estimates of key demographic parameters, and wrong biogeographic inferences (Solís- 68 Lemus et al. 2017; Burbrink and Gehara 2018; Flouri et al. 2018). bioRxiv preprint doi: https://doi.org/10.1101/2021.01.12.426362; this version posted January 13, 2021. The copyright holder for this preprint (which was not certified by peer review) is the author/funder. All rights reserved. No reuse allowed without permission. 69 Speciation events driven by high amplitude climatic variations in the Middle 70 and Late Pleistocene (774 ka to 10 ka), are among the best-known examples of recent 71 diversification processes (Roy et al. 1996; Flantua and Hooghiemstra 2018). Repeated 72 range expansions and contractions driven by Quaternary glacial cycles have 73 extraordinarily contributed to the diversification of montane and alpine biotas (Hewitt 74 1996; Shepard and Burbrink 2008; Sandel et al. 2011; Wallis et al. 2016). Interglacial 75 periods pushed cold-adapted lineages from mid and low latitude regions to shift their 76 distributions towards high elevations to satisfy their specific habitat and climate niche 77 requirements, leading to range fragmentation and divergence in interglacial refugia 78 (e.g., DeChaine and Martin 2005; Djamali et al. 2012). Conversely, glacial periods 79 forced downslope migrations in montane organisms, which likely experienced net 80 range expansions, colonization of new suitable habitats in lowlands and secondary 81 contact and admixture among closely related lineages (Hewitt 1990; Excoffier et al. 82 2009; Marko and Hart 2011). Glacial advances also contributed to allopatric divergence 83 in alpine biotas, particularly those inhabiting extensively glaciated and topographically 84 complex regions where distributional ranges got severely fragmented by ice caps and 85 valley glaciers and populations likely became confined to highly isolated ice-free 86 refugia (Wallis et al. 2016). Isolation periods contributed to genetic and phenotypic 87 differentiation, fueling allopatric adaptive (i.e., divergent natural selection) and non- 88 adaptive (i.e., genetic-drift) lineage divergence and/or reinforcing existing species 89 boundaries (Hewitt 1996, 1999; Czekanski-Moir and Rundell 2019). If reproductive 90 isolation did not evolve while in refugia, secondary contact during range shifts resulted 91 in the collapse of formerly distinct lineages (i.e., speciation reversal; Kearns et al. 2018; 92 Maier et al. 2019), introgressive hybridization (e.g., Salzburger et al. 2002; Schweizer et bioRxiv preprint doi: https://doi.org/10.1101/2021.01.12.426362; this version posted January 13, 2021. The copyright holder for this preprint (which was not certified by peer review) is the author/funder. All rights reserved. No reuse allowed without permission. 93 al. 2019), or even contributed to complete the speciation process via reinforcement of 94 reproductive isolation (Butlin and Hewitt 1985; Hewitt 1996; Nevado et al. 2018). For 95 these reasons, Pleistocene glacial cycles have been considered to both promote range 96 fragmentation and allopatric speciation (Knowles 2000) and inhibit speciation through 97 genetic homogenization (Zink and Slowinski 1995; Klicka and Zink 1997). 98 The Iberian Peninsula and western Maghreb regions present a rich biodiversity 99 and an alike species composition due to their close geographical proximity, similar 100 climatic and ecological conditions, complex topography, and a geological history that 101 has led to multiple episodes of connectivity and isolation for terrestrial biotas 102 distributed in the two continents (Blondel and Aronson 2002; Krijgsman 2002; 103 Meulenkamp and Sissingh 2003). As a result, this region is an important center of 104 diversification for numerous organism groups and considered a hotspot for animal and 105 plant biodiversity (Rodríguez-Sánchez et al. 2008; Myers et al. 2020). The re-opening of 106 the Strait of Gibraltar at the beginning of the Pliocene led to the loss of the last 107 intercontinental land connection stablished during the desiccation of the 108 Mediterranean Basin in the Messinian Salinity Crisis (Krijgsman 2002; Husemann et al. 109 2014), a phenomenon representing the starting point for the diversification of many 110 lineages whose distributional ranges resulted fragmented under the new geographic 111 setting (e.g., Veith et al. 2003; Faille et al. 2014). However, empirical evidence has also 112 supported that the shortening
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