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Evolutionary History of the Galápagos Rail Revealed by Ancient bioRxiv preprint doi: https://doi.org/10.1101/2020.10.07.326983; this version posted October 8, 2020. The copyright holder for this preprint (which was not certified by peer review) is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under aCC-BY-NC 4.0 International license. 1 Evolutionary history of the Galápagos Rail revealed 2 by ancient mitogenomes and modern samples 3 Jaime A. Chaves1,2,*, Pedro J. Martinez-Torres2, Emiliano A. Depino3, Sebastian Espinoza- 4 Ulloa4,5, Jefferson García-Loor6, Annabel Beichman7 and Martin Stervander8,* 5 1 Department of Biology, San Francisco State University, 1600 Holloway, San Francisco, CA, USA; 6 2 Colegio de Ciencias Biológicas y Ambientales, Universidad San Francisco de Quito, Campus Cumbayá, 7 Quito, Ecuador; [email protected] (P.J.M.-T.) 8 3 Laboratorio de Ecología, Comportamiento y Sonidos Naturales (ECOSON), Instituto de Bio y 9 Geociencias del Noroeste Argentino (IBIGEO-CONICET), Av 9 de julio 14, Rosario de Lerma, 4405 10 Salta, Argentina; [email protected] 11 4 Department of Biology, University of Saskatchewan, 112 Science Place, Saskatoon, SK, Canada. 12 5 Facultad de Medicina, Pontificia Universidad Católica del Ecuador, Av. 12 de Octubre, Quito, Ecuador; 13 [email protected] 14 6 Laboratorio de Ecología Evolutiva, Colegio de Ciencias Biológicas y Ambientales, Universidad San 15 Francisco de Quito, Campus Cumbayá, Quito, Ecuador; [email protected] 16 7 Department of Genome Sciences, University of Washington, Seattle, WA, USA; 17 [email protected] 18 8 Bird Group, Department of Life Sciences, The Natural History Museum, Akeman Street, Tring, 19 Hertfordshire HP23 6AP, UK 20 * Correspondence: [email protected] (J.A.C.), [email protected] (M.S.) 21 ORCID id: 0000-0003-0679-2603 (J.A.C.), 0000-0001-7368-6726 (E.A.D.), 0000-0003-1497-356X (S.E.U.), 22 0000-0002-6991-587X (A.B.), 0000-0002-6139-7828 (M.S.) 23 Abstract 24 The biotas of the Galápagos Islands are probably one of the best studied island systems and have provided 25 a broad model of insular species’ origins and evolution. Nevertheless, some Galápagos species remain 26 poorly characterized, such as the Galápagos Rail Laterallus spilonota. This bird species is one of the less 27 explored groups of endemic vertebrates on these islands, due to its elusive behavior, cryptic plumage and 28 restricted distribution. To date there is no genetic assessment of its origins and sister relationships to other 29 taxa, and importantly, there is no data on its current genetic diversity. This lack of information is critical 30 given the adverse fate of island rail species around the world in the recent past. Here we examine the 31 genetics of Galápagos Rails using a combination of mitogenome de novo assembly with multi-locus 32 sequencing (mtDNA+nuDNA) from both modern and historical samples. We show that the Galápagos 33 Rail is part of the ‘American black rail clade’, sister to Black Rail L. jamaicensis, with a colonization of 34 Galápagos dated to 1.2 Mya. The separate analysis of cytb, ND2, and RAG-1 markers demonstrates 35 shallow population structure across sampled islands, possibly due to elevated island connectivity. 36 Additionally, birds sampled from Pinta possessed the lowest levels of genetic diversity, most likely 37 reflecting the impact of past bottlenecks due to habitat loss caused by invasive goats grazing on sensitive 38 habitat. The data presented here highlights the low genetic diversity in this endemic rail species and 39 suggests the use of genetic data (both modern and historical) to guide conservation efforts. 40 41 Keywords: ancient DNA; genetic diversity; island colonization; Laterallus spilonota; Rallidae; 42 phylogenetics bioRxiv preprint doi: https://doi.org/10.1101/2020.10.07.326983; this version posted October 8, 2020. The copyright holder for this preprint (which was not certified by peer review) is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under aCC-BY-NC 4.0 International license. Chaves et al. (2020) preprint: Evolutionary history of the Galápagos Rail Laterallus spilonota 43 1. Introduction 44 Studies of island biotas provide insights into the origin of species and the associated factors promoting it. 45 From characterizing morphological variation, documenting the time of divergence from mainland 46 counterparts, to ultimately understanding the formation of independently evolving lineages, insular species 47 have inspired scientists for centuries [1–6]. One such biological assemblage are species found on the 48 Galápagos archipelago. Generalities about Galápagos fauna have for example supported the hypothesis of 49 island colonization in relation to island age (i.e. progression rule) [7,8], provided text book examples of the 50 origin of adaptive radiations (i.e. Darwin’s finches) [3,9], postulated the role of isolation in promoting 51 diversification (i.e. mockingbirds Mimus spp. [10], giant tortoises Chelonoidis spp. [11]), and reported 52 various origins for endemic species [12,13]. Most of these studies focus on highly charismatic species, 53 leaving almost no conspicuous species on the Galápagos unstudied. In particular, endemic vertebrate 54 species have been subject to extensive molecular and morphological assessment providing one of the 55 greatest insular biota datasets. The data has helped to raise awareness of conservation status and proposed 56 management recommendations for the preservation of several of these species. Unfortunately, though, a 57 few less charismatic endemic vertebrate species have suffered from a lack of such effort. This has not only 58 left a gap in our understanding of their evolutionary trajectory and origin, but most importantly, their 59 conservation status is poorly known and their extinction could potentially go unnoticed. 60 Species inhabiting oceanic islands are the most vulnerable to extinction due to human impact, 61 particularly those that are flightless. Flightlessness in birds has evolved as a consequence of the absence of 62 natural predators [14–16] creating opportunity for endemism. Rails (Rallidae) present high levels of 63 endemism, in many cases restricted to a single island [17,18]. Unfortunately, the introduction of predators 64 to such isolated regions make these species extremely susceptible to population declines and ultimately 65 extinction [19,20]. Historically, rails have succumbed quickly to human contact with the loss of as many 66 as 440–1,580 species on islands in the Pacific [21], where 22 of the 33 currently threatened rail species 67 (World Conservation Union) occur on islands, of which 86% are threatened by invasive mammals (BirdLife 68 International - IUCN databases). 69 The endemic Galápagos Rail Laterallus spilonota is an example of both this extreme adaptation to an 70 isolated system of oceanic islands and the fate of inconspicuousness, being the least studied land-bird species 71 on the Galápagos Islands. The historical distribution of Galápagos Rails has been documented by collectors 72 and naturalists since the early 1900s, allowing a reconstruction of the impact and decline of populations 73 compared to present data [22]. The introduction of rats and goats in the 18th century, by mariners and early 74 colonists using these islands for water and food supply [23–25], has had a direct impact on native species’ 75 survival and ecosystem modification [26]. Galápagos Rails, once abundant as reported by Darwin (1896), 76 depend on the presence of wetlands and dense vegetation, but these habitats were decimated and eroded by 77 grazing goats and agricultural expansion, and altered by invasive plant species [27,28]. Likewise, rats and 78 cats have had a negative impact on the survival of rails given their inability to fly [29]. These events have 79 resulted in the extinction of several of the Galápagos Rail populations across the archipelago and a dramatic 80 decline in surviving populations [30,31]. Galápagos Rails are currently restricted to small pockets of natural 81 habitat in the highlands on five of the eight islands they historically inhabited. The species is currently listed 82 as Vulnerable (Red Data List)[32] and despite the eradication of goats since the 1970s and the ongoing pest 83 control efforts [33–35], rails still face continuous threats of habitat modification by invasive species [36] 84 and expansion of agriculture [37]. 85 Galápagos Rails are one of the least studied land bird species on the Galápagos: i) there is no genetic 86 assessment of its phylogenetic relationships to other rails, ii) there are no estimations of the time since its 87 colonization, iii) no inference of its phylogeographic patterns and inter-island genetic relationships, and 88 importantly iv) there is no assessment of its current genetic diversity. This last effort is critical if we 89 acknowledge the adverse fate of rails around the world in the recent past and thus, the uncertainty of its 90 evolutionary potential in the future. 2 of 16 bioRxiv preprint doi: https://doi.org/10.1101/2020.10.07.326983; this version posted October 8, 2020. The copyright holder for this preprint (which was not certified by peer review) is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under aCC-BY-NC 4.0 International license. Chaves et al. (2020) preprint: Evolutionary history of the Galápagos Rail Laterallus spilonota 91 Here, we focus on alleviating these aspects and bringing to light the evolutionary history of this 92 enigmatic endemic land bird of the Galápagos. We present data from a combination of fresh tissue samples 93 and century-old historic museum specimens collected by the California Academy of Sciences expedition to 94 the Galápagos in 1905–1906. The phylogenetic relationships for the Galápagos Rail proposed here for the 95 first time are based on high-throughput sequenced de novo assembly of its mitochondrial genome 96 (mitogenome), placing this species into a phylogenetic context.
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