1
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Campbell MA, Hammer MP, Adams M, Raadik TA, Unmack PJ. Evolutionary relationships and fine-scale geographic structuring in the temperate percichthyid genus Gadopsis (blackfishes) to support fisheries and conservation management. Mol Phylogenet Evol 2024; 199:108159. [PMID: 39029548 DOI: 10.1016/j.ympev.2024.108159] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2024] [Revised: 07/04/2024] [Accepted: 07/14/2024] [Indexed: 07/21/2024]
Abstract
Gadopsis (Percichthyidae) is a freshwater genus distributed in south-eastern Australia, including Tasmania, and comprises two recognized species. Previous molecular phylogenetic investigations of the genus, mostly conducted in the pre-genomics era and reflecting a range of geographic and molecular sampling intensities, have supported the recognition of up to seven candidate species. Here we analyze a genome-wide SNP dataset that provides comprehensive geographic and genomic coverage of Gadopsis to produce a robust hypothesis of species boundaries and evolutionary relationships. We then leverage the SNP dataset to characterize relationships within candidate species that lack clear intraspecific phylogenetic relationships. We find further support for the seven previously identified candidate species of Gadopsis and evidence that the Bass Strait centered candidate species (SBA) originated from ancient hybridization. The SNP dataset permits a high degree of intraspecific resolution, providing improvements over previous studies, with numerous candidate species showing intraspecific divisions in phylogenetic analysis. Further population genetic analysis of the Murray-Darling candidate species (NMD) and SBA finds support for K = 6 and K = 7 genetic clusters, respectively. The SNP data generated for this study have diverse applications in natural resource management for these fishes of conservation concern.
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Affiliation(s)
- Matthew A Campbell
- The University of California Davis, Davis, California, USA; University of Alaska Museum of the North, Fairbanks, Alaska, USA.
| | - Michael P Hammer
- Museum and Art Gallery of the Northern Territory, Darwin, Northern Territory, Australia
| | - Mark Adams
- South Australian Museum, Adelaide, South Australia, Australia; School of Biological Sciences, University of Adelaide, Adelaide, South Australia, Australia
| | - Tarmo A Raadik
- Arthur Rylah Institute for Environmental Research, Department of Energy, Environment and Climate Action, Heidelberg, Victoria, Australia
| | - Peter J Unmack
- University of Canberra, Canberra, Australian Capital Territory, Australia
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2
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Fenker J, Melville J, Moritz C. Dragons in the tropics - Phylogeography and speciation in Diporiphora lizards and common geographic breaks in co-distributed taxa. Mol Phylogenet Evol 2024; 197:108090. [PMID: 38723791 DOI: 10.1016/j.ympev.2024.108090] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2023] [Revised: 12/20/2023] [Accepted: 05/04/2024] [Indexed: 05/25/2024]
Abstract
Co-distributed taxa can respond both similarly or differently to the same climatic and geological events, resulting in a range of phylogeographic patterns across the region. Using a nested approach on a taxonomically diverse yet morphologically conservative group of agamid lizards, we first aimed to evaluate more precisely the extent of phylogeographic structuring within the genus. Then, focusing on four lineages within the more widespread species, we assessed the impact of biogeographic barriers on phylogeographic structuring and demographic history of species, comparing to patterns previously observed in co-distributed taxa. These species occur in the Australian Monsoonal Tropics, a vast tropical savanna system with high richness and endemism associated with environmental heterogeneity and past climate fluctuations. The employment of genomic data helped to determine the relationships between specific taxa that were previously difficult to place. We found a local influence of biogeographic and climatic breaks on population dynamics, analogous to other species. We detected high levels of population structure in the West Kimberley and Arnhem Plateau, which are already known for high endemism. However, we also highlighted unique lineages in areas that have been overlooked until recently, in the South Kimberley and West Top End. Climatic and geographical features in the Arnhem Plateau act as a soft barrier between populations in the east and west regions of the Top End. These observations reflect patterns observed for other vertebrates across this rich biome, indicating how climatic variation, species' ecology, and landscape features interact to shape regional diversity and endemism.
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Affiliation(s)
- Jessica Fenker
- Division of Ecology & Evolution, Research School of Biology, Australian National University, 46 Sullivans Creek Road, Acton 2601, Canberra, ACT, Australia; Department of Sciences, Museums Victoria, Melbourne Museum, 11 Nicholson StreetCarlton 3053, Melbourne, VIC, Australia.
| | - Jane Melville
- Department of Sciences, Museums Victoria, Melbourne Museum, 11 Nicholson StreetCarlton 3053, Melbourne, VIC, Australia
| | - Craig Moritz
- Division of Ecology & Evolution, Research School of Biology, Australian National University, 46 Sullivans Creek Road, Acton 2601, Canberra, ACT, Australia
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3
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Lott MJ, Frankham GJ, Eldridge MDB, Alquezar‐Planas DE, Donnelly L, Zenger KR, Leigh KA, Kjeldsen SR, Field MA, Lemon J, Lunney D, Crowther MS, Krockenberger MB, Fisher M, Neaves LE. Reversing the decline of threatened koala ( Phascolarctos cinereus) populations in New South Wales: Using genomics to enhance conservation outcomes. Ecol Evol 2024; 14:e11700. [PMID: 39091325 PMCID: PMC11289790 DOI: 10.1002/ece3.11700] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2024] [Revised: 06/17/2024] [Accepted: 06/24/2024] [Indexed: 08/04/2024] Open
Abstract
Genetic management is a critical component of threatened species conservation. Understanding spatial patterns of genetic diversity is essential for evaluating the resilience of fragmented populations to accelerating anthropogenic threats. Nowhere is this more relevant than on the Australian continent, which is experiencing an ongoing loss of biodiversity that exceeds any other developed nation. Using a proprietary genome complexity reduction-based method (DArTSeq), we generated a data set of 3239 high quality Single Nucleotide Polymorphisms (SNPs) to investigate spatial patterns and indices of genetic diversity in the koala (Phascolarctos cinereus), a highly specialised folivorous marsupial that is experiencing rapid and widespread population declines across much of its former range. Our findings demonstrate that current management divisions across the state of New South Wales (NSW) do not fully represent the distribution of genetic diversity among extant koala populations, and that care must be taken to ensure that translocation paradigms based on these frameworks do not inadvertently restrict gene flow between populations and regions that were historically interconnected. We also recommend that koala populations should be prioritised for conservation action based on the scale and severity of the threatening processes that they are currently faced with, rather than placing too much emphasis on their perceived value (e.g., as reservoirs of potentially adaptive alleles), as our data indicate that existing genetic variation in koalas is primarily partitioned among individual animals. As such, the extirpation of koalas from any part of their range represents a potentially critical reduction of genetic diversity for this iconic Australian species.
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Affiliation(s)
- Matthew J. Lott
- Australian Museum Research InstituteSydneyNew South WalesAustralia
| | | | | | | | - Lily Donnelly
- Molecular Ecology and Evolutionary Laboratory, College of Science and EngineeringJames Cook UniversityTownsvilleQueenslandAustralia
| | - Kyall R. Zenger
- Centre for Sustainable Tropical Fisheries and Aquaculture, College of Science and EngineeringJames Cook UniversityTownsvilleQueenslandAustralia
| | - Kellie A. Leigh
- Science for Wildlife LtdMount VictoriaNew South WalesAustralia
| | - Shannon R. Kjeldsen
- Molecular Ecology and Evolutionary Laboratory, College of Science and EngineeringJames Cook UniversityTownsvilleQueenslandAustralia
- Centre for Sustainable Tropical Fisheries and Aquaculture, College of Science and EngineeringJames Cook UniversityTownsvilleQueenslandAustralia
- Centre for Tropical Bioinformatics and Molecular BiologyJames Cook UniversityTownsvilleQueenslandAustralia
| | - Matt A. Field
- Centre for Tropical Bioinformatics and Molecular BiologyJames Cook UniversityTownsvilleQueenslandAustralia
- Immunogenomics LabGarvan Institute of Medical ResearchDarlinghurstNew South WalesAustralia
| | - John Lemon
- JML Environmental ConsultantsArmidaleNew South WalesAustralia
- School of Environmental and Rural ScienceUniversity of New EnglandArmidaleNew South WalesAustralia
| | - Daniel Lunney
- Australian Museum Research InstituteSydneyNew South WalesAustralia
- Department of Planning and EnvironmentParramattaNew South WalesAustralia
- School of Life and Environmental SciencesUniversity of SydneyCamperdownNew South WalesAustralia
| | - Mathew S. Crowther
- School of Life and Environmental SciencesUniversity of SydneyCamperdownNew South WalesAustralia
| | - Mark B. Krockenberger
- Sydney School of Veterinary ScienceUniversity of SydneyCamperdownNew South WalesAustralia
| | - Mark Fisher
- 3D Ecology MappingEmerald BeachNew South WalesAustralia
| | - Linda E. Neaves
- Fenner School of Environment and SocietyThe Australian National UniversityCanberraAustralian Capital TerritoryAustralia
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4
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Vandewege MW, Gutierrez J, Davis DR, Forstner MRJ, Mali I. Patterns of genetic divergence in the Rio Grande cooter (Pseudemys gorzugi), a riverine turtle inhabiting an arid and anthropogenically modified system. J Hered 2024; 115:253-261. [PMID: 38373252 PMCID: PMC11081133 DOI: 10.1093/jhered/esae011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2023] [Accepted: 02/15/2024] [Indexed: 02/21/2024] Open
Abstract
The lower Rio Grande and Pecos River of the southwest United States have been heavily modified by human activities, profoundly impacting the integrity of their aquatic wildlife. In this context, we focused our study on the population genomics of the Rio Grande Cooter (Pseudemys gorzugi), a freshwater turtle of increasing conservation concern, residing in these two rivers and their tributaries. The genetic data revealed two distinct populations: one in the Pecos and Black Rivers of New Mexico and another in the Rio Grande and Devils River of Texas, with admixed individuals identified at the confluence of the Rio Grande and Pecos River. In addition to having a smaller geographic range, we found lower observed heterozygosity, reduced nucleotide diversity, and a smaller effective population size (Ne) in New Mexico population. Our results depict a significant isolation-by-distance pattern across their distribution, with migration being notably infrequent at river confluences. These findings are pivotal for future conservation and restoration strategies, emphasizing the need to recognize the unique needs of each population.
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Affiliation(s)
- Michael W Vandewege
- Department of Clinical Sciences, College of Veterinary Medicine, North Carolina State University, Raleigh, NC, USA
| | - Javier Gutierrez
- Biomedical Forensic Sciences, Anatomy and Neurobiology Department, Boston University Chobanian and Avedisian School of Medicine, Boston, MA, USA
| | - Drew R Davis
- Department of Biology, Eastern New Mexico University, Portales, NM, USA
- Biodiversity Collections, Department of Integrative Biology, The University of Texas at Austin, Austin, TX, USA
| | | | - Ivana Mali
- Fisheries, Wildlife, and Conservation Biology Program, Department of Forestry and Environmental Resources, North Carolina State University, Raleigh, NC, USA
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5
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Johnson NA, Henderson AR, Jones JW, Beaver CE, Ahlstedt SA, Dinkins GR, Eckert NL, Endries MJ, Garner JT, Harris JL, Hartfield PD, Hubbs DW, Lane TW, McGregor MA, Moles KR, Morrison CL, Wagner MD, Williams JD, Smith CH. Glacial vicariance and secondary contact shape demographic histories in a freshwater mussel species complex. J Hered 2024; 115:72-85. [PMID: 38015800 DOI: 10.1093/jhered/esad075] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2023] [Revised: 10/16/2023] [Accepted: 11/27/2023] [Indexed: 11/30/2023] Open
Abstract
Characterizing the mechanisms influencing the distribution of genetic variation in aquatic species can be difficult due to the dynamic nature of hydrological landscapes. In North America's Central Highlands, a complex history of glacial dynamics, long-term isolation, and secondary contact have shaped genetic variation in aquatic species. Although the effects of glacial history have been demonstrated in many taxa, responses are often lineage- or species-specific and driven by organismal ecology. In this study, we reconstruct the evolutionary history of a freshwater mussel species complex using a suite of mitochondrial and nuclear loci to resolve taxonomic and demographic uncertainties. Our findings do not support Pleurobema rubrum as a valid species, which is proposed for listing as threatened under the U.S. Endangered Species Act. We synonymize P. rubrum under Pleurobema sintoxia-a common and widespread species found throughout the Mississippi River Basin. Further investigation of patterns of genetic variation in P. sintoxia identified a complex demographic history, including ancestral vicariance and secondary contact, within the Eastern Highlands. We hypothesize these patterns were shaped by ancestral vicariance driven by the formation of Lake Green and subsequent secondary contact after the last glacial maximum. Our inference aligns with demographic histories observed in other aquatic taxa in the region and mirrors patterns of genetic variation of a freshwater fish species (Erimystax dissimilis) confirmed to serve as a parasitic larval host for P. sintoxia. Our findings directly link species ecology to observed patterns of genetic variation and may have significant implications for future conservation and recovery actions of freshwater mussels.
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Affiliation(s)
- Nathan A Johnson
- U.S. Geological Survey, Wetland and Aquatic Research Center, Gainesville, FL, United States
| | - Andrew R Henderson
- U.S. Fish and Wildlife Service, Ecological Services, Asheville, NC, United States
| | - Jess W Jones
- U.S. Fish and Wildlife Service, Virginia Tech University, Blacksburg, VA, United States
| | - Caitlin E Beaver
- U.S. Geological Survey, Wetland and Aquatic Research Center, Gainesville, FL, United States
| | - Steven A Ahlstedt
- McClung Museum of Natural History and Culture, University of Tennessee, Knoxville, TN, United States
| | - Gerald R Dinkins
- McClung Museum of Natural History and Culture, University of Tennessee, Knoxville, TN, United States
| | - Nathan L Eckert
- U.S. Fish and Wildlife Service, Neosho National Fish Hatchery, Neosho, MO, United States
| | - Mark J Endries
- U.S. Fish and Wildlife Service, Ecological Services, Asheville, NC, United States
| | - Jeffrey T Garner
- Alabama Division of Wildlife and Freshwater Fisheries, Florence, AL, United States
| | - John L Harris
- Arkansas State University Museum of Zoology, Jonesboro, AR, United States
| | - Paul D Hartfield
- U.S. Fish and Wildlife Service, Ecological Services, Jackson, MS, United States
| | - Don W Hubbs
- DJH Environmental Services, Camden, TN, United States
| | - Timothy W Lane
- Virginia Department of Wildlife Resources, Marion, VA, United States
| | - Monte A McGregor
- Kentucky Department of Fish and Wildlife Resources, Frankfort, KY, United States
| | - Kendall R Moles
- Arkansas Game and Fish Commission, Benton, AR, United States
| | - Cheryl L Morrison
- U.S. Geological Survey, Eastern Ecological Science Center, Kearneysville, WV, United States
| | - Matthew D Wagner
- U.S. Fish and Wildlife Service, Ecological Services, Jackson, MS, United States
| | - James D Williams
- Florida Museum, University of Florida, Gainesville, FL, United States
| | - Chase H Smith
- Department of Integrative Biology, University of Texas at Austin, Austin, TX, United States
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6
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Teixeira H, Le Corre M, Michon L, Nicoll MAC, Jaeger A, Nikolic N, Pinet P, Couzi FX, Humeau L. Past volcanic activity predisposes an endemic threatened seabird to negative anthropogenic impacts. Sci Rep 2024; 14:1960. [PMID: 38263429 PMCID: PMC10805739 DOI: 10.1038/s41598-024-52556-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2023] [Accepted: 01/19/2024] [Indexed: 01/25/2024] Open
Abstract
Humans are regularly cited as the main driver of current biodiversity extinction, but the impact of historic volcanic activity is often overlooked. Pre-human evidence of wildlife abundance and diversity are essential for disentangling anthropogenic impacts from natural events. Réunion Island, with its intense and well-documented volcanic activity, endemic biodiversity, long history of isolation and recent human colonization, provides an opportunity to disentangle these processes. We track past demographic changes of a critically endangered seabird, the Mascarene petrel Pseudobulweria aterrima, using genome-wide SNPs. Coalescent modeling suggested that a large ancestral population underwent a substantial population decline in two distinct phases, ca. 125,000 and 37,000 years ago, coinciding with periods of major eruptions of Piton des Neiges. Subsequently, the ancestral population was fragmented into the two known colonies, ca. 1500 years ago, following eruptions of Piton de la Fournaise. In the last century, both colonies declined significantly due to anthropogenic activities, and although the species was initially considered extinct, it was rediscovered in the 1970s. Our findings suggest that the current conservation status of wildlife on volcanic islands should be firstly assessed as a legacy of historic volcanic activity, and thereafter by the increasing anthropogenic impacts, which may ultimately drive species towards extinction.
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Affiliation(s)
- Helena Teixeira
- UMR ENTROPIE (Université de La Réunion, IRD, CNRS, IFREMER, Université de Nouvelle-Calédonie), 15 Avenue René Cassin, CS 92003, 97744, Saint Denis Cedex 9, Ile de La Réunion, France.
| | - Matthieu Le Corre
- UMR ENTROPIE (Université de La Réunion, IRD, CNRS, IFREMER, Université de Nouvelle-Calédonie), 15 Avenue René Cassin, CS 92003, 97744, Saint Denis Cedex 9, Ile de La Réunion, France
| | - Laurent Michon
- Université de La Réunion, Laboratoire Géosciences Réunion, 97744, Saint Denis, France
- Université Paris Cité, Institut de physique du globe de Paris, CNRS, 75005, Paris, France
| | - Malcolm A C Nicoll
- Institute of Zoology, Zoological Society of London, Regent's Park, London, NW1 4RY, UK
| | - Audrey Jaeger
- UMR ENTROPIE (Université de La Réunion, IRD, CNRS, IFREMER, Université de Nouvelle-Calédonie), 15 Avenue René Cassin, CS 92003, 97744, Saint Denis Cedex 9, Ile de La Réunion, France
| | | | - Patrick Pinet
- Parc National de La Réunion, Life+ Pétrels, 258 Rue de la République, 97431, Plaine des Palmistes, Réunion Island, France
| | - François-Xavier Couzi
- Société d'Etudes Ornithologiques de La Réunion (SEOR), 13 ruelle des Orchidées, 97440, Saint André, Réunion Island, France
| | - Laurence Humeau
- UMR PVBMT (Université de La Réunion, CIRAD), 15 Avenue René Cassin, CS 92003, 97744, Saint Denis Cedex 9, Ile de La Réunion, France
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7
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Parvizi E, Vaughan AL, Dhami MK, McGaughran A. Genomic signals of local adaptation across climatically heterogenous habitats in an invasive tropical fruit fly (Bactrocera tryoni). Heredity (Edinb) 2024; 132:18-29. [PMID: 37903919 PMCID: PMC10798995 DOI: 10.1038/s41437-023-00657-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2023] [Revised: 09/21/2023] [Accepted: 10/17/2023] [Indexed: 11/01/2023] Open
Abstract
Local adaptation plays a key role in the successful establishment of pest populations in new environments by enabling them to tolerate novel biotic and abiotic conditions experienced outside their native range. However, the genomic underpinnings of such adaptive responses remain unclear, especially for agriculturally important pests. We investigated population genomic signatures in the tropical/subtropical Queensland fruit fly, Bactrocera tryoni, which has an expanded range encompassing temperate and arid zones in Australia, and tropical zones in the Pacific Islands. Using reduced representation sequencing data from 28 populations, we detected allele frequency shifts associated with the native/invasive status of populations and identified environmental factors that have likely driven population differentiation. We also determined that precipitation, temperature, and geographic variables explain allelic shifts across the distribution range of B. tryoni. We found spatial heterogeneity in signatures of local adaptation across various climatic conditions in invaded areas. Specifically, disjunct invasive populations in the tropical Pacific Islands and arid zones of Australia were characterised by multiple significantly differentiated single nucleotide polymorphisms (SNPs), some of which were associated with genes with well-understood function in environmental stress (e.g., heat and desiccation) response. However, invasive populations in southeast Australian temperate zones showed higher gene flow with the native range and lacked a strong local adaptive signal. These results suggest that population connectivity with the native range has differentially affected local adaptive patterns in different invasive populations. Overall, our findings provide insights into the evolutionary underpinnings of invasion success of an important horticultural pest in climatically distinct environments.
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Affiliation(s)
- Elahe Parvizi
- Te Aka Mātuatua/School of Science, University of Waikato, Hamilton, New Zealand
| | - Amy L Vaughan
- Biocontrol and Molecular Ecology, Manaaki Whenua Landcare Research, Lincoln, New Zealand
| | - Manpreet K Dhami
- Biocontrol and Molecular Ecology, Manaaki Whenua Landcare Research, Lincoln, New Zealand
| | - Angela McGaughran
- Te Aka Mātuatua/School of Science, University of Waikato, Hamilton, New Zealand.
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8
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Parkin T, Donnellan SC, Parkin B, Shea GM, Rowley JJL. Phylogeography, hybrid zones and contemporary species boundaries in the south-eastern Australian smooth frogs (Anura: Myobatrachidae: Geocrinia). Mol Phylogenet Evol 2023; 189:107934. [PMID: 37769826 DOI: 10.1016/j.ympev.2023.107934] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2023] [Accepted: 09/25/2023] [Indexed: 10/03/2023]
Abstract
Paleo-climatic fluctuations have driven episodic changes in species distributions, providing opportunities for populations to diverge in isolation and hybridise following secondary contact. Studies of phylogeographic diversity and patterns of gene flow across hybrid zones can provide insight into contemporary species boundaries and help to inform taxonomic and conservation inferences. Here we explore geographic diversity within the acoustically divergent yet morphologically conserved south-eastern Australian smooth frog complex and assess gene flow across a narrow hybrid zone using mitochondrial nucleotide sequences and nuclear genome-wide single nucleotide polymorphisms. Our analyses reveal the presence of an evolutionarily distinct taxon restricted to the Otway Plains and Ranges, Victoria, which forms a narrow (9-30 km wide), spatiotemporally stable (>50 years) hybrid zone with Geocrinia laevis, which we describe herein as a new species.
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Affiliation(s)
- Thomas Parkin
- Australian Museum Research Institute, Sydney NSW 2010, Australia.
| | | | - Benjamin Parkin
- Australian Museum Research Institute, Sydney NSW 2010, Australia
| | - Glenn M Shea
- Australian Museum Research Institute, Sydney NSW 2010, Australia; Sydney School of Veterinary Science B01, University of Sydney, NSW 2006, Australia
| | - Jodi J L Rowley
- Australian Museum Research Institute, Sydney NSW 2010, Australia; University of New South Wales, Sydney NSW 2052, Australia
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9
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Unmack PJ, Cook BD, Johnson JB, Hammer MP, Adams M. Phylogeography of a widespread Australian freshwater fish, western carp gudgeon (Eleotridae: Hypseleotris klunzingeri): Cryptic species, hybrid zones, and strong intra-specific divergences. Ecol Evol 2023; 13:e10682. [PMID: 37920767 PMCID: PMC10618717 DOI: 10.1002/ece3.10682] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2023] [Accepted: 10/17/2023] [Indexed: 11/04/2023] Open
Abstract
Despite belonging to the most abundant and widespread genus of freshwater fishes in the region, the carp gudgeons of eastern Australia (genus Hypseleotris) have proved taxonomically and ecologically problematic to science since the 19th century. Several molecular studies and a recent taxonomic revision have now shed light on the complex biology and evolutionary history that underlies this group. These studies have demonstrated that carp gudgeons include a sexual/unisexual complex (five sexual species plus an assortment of hemiclonal lineages), many members of which also co-occur with an independent sexual relative, the western carp gudgeon (H. klunzingeri). Here, we fill yet another knowledge gap for this important group by presenting a detailed molecular phylogeographic assessment of the western carp gudgeon across its entire and extensive geographic range. We use a suite of nuclear genetic markers (SNPs and allozymes) plus a matrilineal genealogy (cytb) to demonstrate that H. klunzingeri s.l. also displays considerable taxonomic and phylogeographic complexity. All molecular datasets concur in recognizing the presence of multiple candidate species, two instances of historic between-species admixture, and the existence of a natural hybrid zone between two of the three candidate species found in the Murray-Darling Basin. We also discuss the major phylogeographic patterns evident within each taxon. Together, these analyses provide a robust molecular, taxonomic, and distributional framework to underpin future morphological and ecological investigations on this prominent member of regional freshwater ecosystems in eastern Australia.
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Affiliation(s)
- Peter J Unmack
- Centre for Applied Water Science Institute for Applied Ecology, University of Canberra Canberra Australian Capital Territory Australia
| | - Benjamin D Cook
- Australian Rivers Institute, Griffith University Brisbane Queensland Australia
- frc environmental Wellington Point Queensland Australia
| | - Jerald B Johnson
- Evolutionary Ecology Laboratories, Department of Biology Brigham Young University Provo Utah USA
| | - Michael P Hammer
- Museum and Art Gallery of the Northern Territory Darwin Northwest Territories Australia
| | - Mark Adams
- Evolutionary Biology Unit South Australian Museum Adelaide South Australia Australia
- School of Biological Sciences University of Adelaide Adelaide South Australia Australia
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10
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Dufresnes C, Poyarkov N, Jablonski D. Acknowledging more biodiversity without more species. Proc Natl Acad Sci U S A 2023; 120:e2302424120. [PMID: 37748058 PMCID: PMC10556632 DOI: 10.1073/pnas.2302424120] [Citation(s) in RCA: 15] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/27/2023] Open
Abstract
Delimiting and naming biodiversity is a vital step toward wildlife conservation and research. However, species delimitation must be consistent across biota so that the limited resources available for nature protection can be spent effectively and objectively. To date, newly discovered lineages typically are either left undescribed and thus remain unprotected or are being erroneously proposed as new species despite mixed evidence for completed speciation, in turn contributing to the emerging problem of taxonomic inflation. Inspired by recent conceptual and methodological progress, we propose a standardized workflow for species delimitation that combines phylogenetic and hybrid zone analyses of genomic datasets ("genomic taxonomy"), in which phylogeographic lineages that do not freely admix are ranked as species, while those that have remained fully genetically compatible are ranked as subspecies. In both cases, we encourage their formal taxonomic naming, diagnosis, and description to promote social awareness toward biodiversity. The use of loci throughout the genome overcomes the unreliability of widely used barcoding genes when phylogeographic patterns are complex, while the evaluation of divergence and reproductive isolation unifies the long-opposed concepts of lineage species and biological species. We suggest that a shift in conservation assessments from a single level (species) toward a two-level hierarchy (species and subspecies) will lead to a more balanced perception of biodiversity in which both intraspecific and interspecific diversity are valued and more adequately protected.
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Affiliation(s)
- Christophe Dufresnes
- Laboratory of Amphibian Systematics and Evolutionary Research, College of Biology and Environment, Nanjing Forestry University, Nanjing210037, People’s Republic of China
| | - Nikolay Poyarkov
- Joint Russian-Vietnamese Tropical Research and Technological Center, Hanoi122000, Vietnam
- Department of Vertebrate Zoology, Lomonosov Moscow State University, Moscow119234, Russia
| | - Daniel Jablonski
- Department of Zoology, Comenius University in Bratislava, Bratislava84215, Slovakia
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11
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Donnellan SC, Catullo RA, Rowley JJL, Doughty P, Price L, Hines HB, Richards SJ. Revision of Litoria rothii (Anura: Pelodryadidae) from northern Australia. Zootaxa 2023; 5352:73-108. [PMID: 38221459 DOI: 10.11646/zootaxa.5352.1.3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2023] [Indexed: 01/16/2024]
Abstract
Litoria rothii is a widespread pelodryadid frog with a charismatic laughing advertisement call, distributed across the Australian Monsoon Tropics and southern New Guinea. Given its large distribution spanning well-known biogeographic barriers, variation in male advertisement calls and the prevalence of unresolved species complexes in the Australian frog fauna, we examine the genetic, morphological and acoustic diversity in the species from across its range. Our analyses reveal the presence of a previously unrecognised species in western parts of the range of L. rothii sensu lato, which we describe herein as a new species. Litoria ridibunda sp. nov. is distinguished from L. rothii on the basis of paraphyly of nuclear gene trees with L. everetti from Indonesia, colour patterns on the posterior thigh and male advertisement calls. Compared to L. rothii, the new species has a less contrasting pattern on the posterior thigh and a male advertisement call with a greater number of notes per call and a greater call duration. In particular, the magnitude of call differences between the species is highest where the ranges of the two species are in proximity in north-western Queensland. Our study further emphasises the undiagnosed diversity that remains in Australian frogs, even in relatively large, charismatic, frequently encountered species that often share human dwellings.
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Affiliation(s)
- S C Donnellan
- South Australian Museum; North Terrace; Adelaide; SA; 5000; Australia.
| | - R A Catullo
- School of Biological Sciences; University of Western Australia; Nedlands; WA; 6009; Australia.
| | - J J L Rowley
- Australian Museum Research Institute; Australian Museum; 1 William St; Sydney; NSW; 2010; Australia; Centre for Ecosystem Science; School of Biological; Earth and Environmental Sciences; University of New South Wales; Sydney; NSW; 2052; Australia.
| | - P Doughty
- Collections & Research; Western Australian Museum; 49 Kew St; Welshpool; WA; 6106 Australia.
| | - L Price
- School of Biological Sciences; The University of Adelaide; Adelaide; SA; 5005 Australia.
| | - H B Hines
- Queensland Parks and Wildlife Service and Partnerships; Department of Environment and Science; PO Box 64; Bellbowrie; Qld; 4070; Australia; Honorary Research Fellow; Biodiversity; Queensland Museum; PO Box 3300; South Brisbane; Qld; 4101; Australia.
| | - S J Richards
- South Australian Museum; North Terrace; Adelaide; SA; 5000; Australia; Museum and Art Gallery of the Northern Territory; GPO Box 4646; Darwin; NT; 0801; Australia.
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12
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Hirschfeld M, Barnett A, Sheaves M, Dudgeon C. What Darwin could not see: island formation and historical sea levels shape genetic divergence and island biogeography in a coastal marine species. Heredity (Edinb) 2023; 131:189-200. [PMID: 37400518 PMCID: PMC10462691 DOI: 10.1038/s41437-023-00635-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2022] [Revised: 06/12/2023] [Accepted: 06/13/2023] [Indexed: 07/05/2023] Open
Abstract
Oceanic islands play a central role in the study of evolution and island biogeography. The Galapagos Islands are one of the most studied oceanic archipelagos but research has almost exclusively focused on terrestrial organisms compared to marine species. Here we used the Galapagos bullhead shark (Heterodontus quoyi) and single nucleotide polymorphisms (SNPs) to examine evolutionary processes and their consequences for genetic divergence and island biogeography in a shallow-water marine species without larval dispersal. The sequential separation of individual islands from a central island cluster gradually established different ocean depths between islands that pose barriers to dispersal in H. quoyi. Isolation by resistance analysis suggested that ocean bathymetry and historical sea level fluctuations modified genetic connectivity. These processes resulted in at least three genetic clusters that exhibit low genetic diversity and effective population sizes that scale with island size and the level of geographic isolation. Our results exemplify that island formation and climatic cycles shape genetic divergence and biogeography of coastal marine organisms with limited dispersal comparable to terrestrial taxa. Because similar scenarios exist in oceanic islands around the globe our research provides a new perspective on marine evolution and biogeography with implications for the conservation of island biodiversity.
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Affiliation(s)
- Maximilian Hirschfeld
- College of Science and Engineering, James Cook University, Townsville, Queensland, Australia.
- Galápagos Science Center, Universidad San Francisco de Quito, Isla San Cristóbal, Galápagos, Ecuador.
| | - Adam Barnett
- College of Science and Engineering, James Cook University, Townsville, Queensland, Australia
- Marine Data Technology Hub, James Cook University, Townsville, Queensland, Australia
- Biopixel Oceans Foundation, Cairns, Queensland, Australia
| | - Marcus Sheaves
- College of Science and Engineering, James Cook University, Townsville, Queensland, Australia
- Marine Data Technology Hub, James Cook University, Townsville, Queensland, Australia
| | - Christine Dudgeon
- Biopixel Oceans Foundation, Cairns, Queensland, Australia
- School of Biomedical Sciences, The University of Queensland, Saint Lucia, Queensland, Australia
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13
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Wootton LM, Forest F, Verboom GA. Consilience Across Multiple, Independent Genomic Data Sets Reveals Species in a Complex with Limited Phenotypic Variation. Syst Biol 2023; 72:753-766. [PMID: 37098166 DOI: 10.1093/sysbio/syad024] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2022] [Revised: 04/18/2023] [Accepted: 04/20/2023] [Indexed: 04/27/2023] Open
Abstract
Species delimitation in the genomic era has focused predominantly on the application of multiple analytical methodologies to a single massive parallel sequencing (MPS) data set, rather than leveraging the unique but complementary insights provided by different classes of MPS data. In this study, we demonstrate how the use of two independent MPS data sets, a sequence capture data set and a single-nucleotide polymorphism (SNP) data set generated via genotyping-by-sequencing, enables the resolution of species in three complexes belonging to the grass genus Ehrharta, whose strong population structure and subtle morphological variation limit the effectiveness of traditional species delimitation approaches. Sequence capture data are used to construct a comprehensive phylogenetic tree of Ehrharta and to resolve population relationships within the focal clades, while SNP data are used to detect patterns of gene pool sharing across populations, using a novel approach that visualizes multiple values of K. Given that the two genomic data sets are independent, the strong congruence in the clusters they resolve provides powerful ratification of species boundaries in all three complexes studied. Our approach is also able to resolve a number of single-population species and a probable hybrid species, both of which would be difficult to detect and characterize using a single MPS data set. Overall, the data reveal the existence of 11 and five species in the E. setacea and E. rehmannii complexes, with the E. ramosa complex requiring further sampling before species limits are finalized. Despite phenotypic differentiation being generally subtle, true crypsis is limited to just a few species pairs and triplets. We conclude that, in the absence of strong morphological differentiation, the use of multiple, independent genomic data sets is necessary in order to provide the cross-data set corroboration that is foundational to an integrative taxonomic approach. [Species delimitation; genotyping-by-sequencing; population structure; integrative taxonomy; cryptic species; Ehrharta (Poaceae).].
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Affiliation(s)
- Lara M Wootton
- Department of Biological Sciences and Bolus Herbarium, University of Cape Town, 7701, Rondebosch, South Africa
- Laboratoire d'Ecologie Alpine, Université Grenoble Alpes, FR-38000 Grenoble, France
| | - Félix Forest
- Royal Botanic Gardens, Kew, Richmond, Surrey TW9 3AE, UK
| | - G Anthony Verboom
- Department of Biological Sciences and Bolus Herbarium, University of Cape Town, 7701, Rondebosch, South Africa
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14
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Ropp AJ, Reece KS, Snyder RA, Song J, Biesack EE, McDowell JR. Fine-scale population structure of the northern hard clam ( Mercenaria mercenaria) revealed by genome-wide SNP markers. Evol Appl 2023; 16:1422-1437. [PMID: 37622097 PMCID: PMC10445094 DOI: 10.1111/eva.13577] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2022] [Revised: 06/07/2023] [Accepted: 06/16/2023] [Indexed: 08/26/2023] Open
Abstract
Aquaculture is growing rapidly worldwide, and sustainability is dependent on an understanding of current genetic variation and levels of connectivity among populations. Genetic data are essential to mitigate the genetic and ecological impacts of aquaculture on wild populations and guard against unintended human-induced loss of intraspecific diversity in aquacultured lines. Impacts of disregarding genetics can include loss of diversity within and between populations and disruption of local adaptation patterns, which can lead to a decrease in fitness. The northern hard clam, Mercenaria mercenaria (Linnaeus, 1758), is an economically valuable aquaculture species along the North American Atlantic and Gulf coasts. Hard clams have a pelagic larval phase that allows for dispersal, but the level of genetic connectivity among geographic areas is not well understood. To better inform the establishment of site-appropriate aquaculture brood stocks, this study used DArTseq™ genotyping by sequencing to characterize the genetic stock structure of wild clams sampled along the east coast of North America and document genetic diversity within populations. Samples were collected from 15 locations from Prince Edward Island, Canada, to South Carolina, USA. Stringent data filtering resulted in 4960 single nucleotide polymorphisms from 448 individuals. Five genetic breaks separating six genetically distinct populations were identified: Canada, Maine, Massachusetts, Mid-Atlantic, Chesapeake Bay, and the Carolinas (F ST 0.003-0.046; p < 0.0001). This is the first study to assess population genetic structure of this economically important hard clam along a large portion of its native range with high-resolution genomic markers, enabling identification of previously unrecognized population structure. Results of this study not only broaden insight into the factors shaping the current distribution of M. mercenaria but also reveal the genetic population dynamics of a species with a long pelagic larval dispersal period along the North American Atlantic and Gulf coasts.
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Affiliation(s)
- Ann J. Ropp
- Virginia Institute of Marine Science, William & MaryGloucester PointVirginiaUSA
| | - Kimberly S. Reece
- Virginia Institute of Marine Science, William & MaryGloucester PointVirginiaUSA
| | - Richard A. Snyder
- Virginia Institute of Marine Science, William & MaryGloucester PointVirginiaUSA
| | - Jingwei Song
- Virginia Institute of Marine Science, William & MaryGloucester PointVirginiaUSA
| | - Ellen E. Biesack
- Virginia Institute of Marine Science, William & MaryGloucester PointVirginiaUSA
| | - Jan R. McDowell
- Virginia Institute of Marine Science, William & MaryGloucester PointVirginiaUSA
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15
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Matheson P, Parvizi E, Fabrick JA, Siddiqui HA, Tabashnik BE, Walsh T, McGaughran A. Genome-wide analysis reveals distinct global populations of pink bollworm (Pectinophora gossypiella). Sci Rep 2023; 13:11762. [PMID: 37474628 PMCID: PMC10359307 DOI: 10.1038/s41598-023-38504-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2023] [Accepted: 07/11/2023] [Indexed: 07/22/2023] Open
Abstract
The pink bollworm (Pectinophora gossypiella) is one of the world's most destructive pests of cotton. This invasive lepidopteran occurs in nearly all cotton-growing countries. Its presence in the Ord Valley of North West Australia poses a potential threat to the expanding cotton industry there. To assess this threat and better understand population structure of pink bollworm, we analysed genomic data from individuals collected in the field from North West Australia, India, and Pakistan, as well as from four laboratory colonies that originated in the United States. We identified single nucleotide polymorphisms (SNPs) using a reduced-representation, genotyping-by-sequencing technique (DArTseq). The final filtered dataset included 6355 SNPs and 88 individual genomes that clustered into five groups: Australia, India-Pakistan, and three groups from the United States. We also analysed sequences from Genbank for mitochondrial DNA (mtDNA) locus cytochrome c oxidase I (COI) for pink bollworm from six countries. We found low genetic diversity within populations and high differentiation between populations from different continents. The high genetic differentiation between Australia and the other populations and colonies sampled in this study reduces concerns about gene flow to North West Australia, particularly from populations in India and Pakistan that have evolved resistance to transgenic insecticidal cotton. We attribute the observed population structure to pink bollworm's narrow host plant range and limited dispersal between continents.
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Affiliation(s)
- Paige Matheson
- Te Aka Mātuatua - School of Science, University of Waikato, Hamilton, New Zealand.
| | - Elahe Parvizi
- Te Aka Mātuatua - School of Science, University of Waikato, Hamilton, New Zealand
| | - Jeffrey A Fabrick
- United States Department of Agriculture Agricultural Research Service, United States Arid Land Agricultural Research Center, Maricopa, AZ, 85138, USA
| | | | - Bruce E Tabashnik
- Department of Entomology, University of Arizona, Tucson, AZ, 85721, USA
| | - Tom Walsh
- Commonwealth Scientific Industrial Research Organisation Environment, Clunies Ross St, Acton, ACT, 2601, Australia
| | - Angela McGaughran
- Te Aka Mātuatua - School of Science, University of Waikato, Hamilton, New Zealand
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16
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Nankivell JH, Maryan B, Bush BG, Hutchinson MN. Whip it into shape: Revision of the Demansia psammophis (Schlegel, 1837) complex (Squamata: Elapidae), with a description of a new species from central Australia. Zootaxa 2023; 5311:301-339. [PMID: 37518640 DOI: 10.11646/zootaxa.5311.3.1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2023] [Indexed: 08/01/2023]
Abstract
The genus Demansia Günther is the most diverse genus of Australian terrestrial elapids. A phylogenetic framework for the familiar but problematic taxa D. psammophis and D. reticulata (Gray) has been long overdue to ascertain interspecific relationships and resolve unclear taxonomic issues. Here we present an integrated molecular phylogenetic and morphological analyses to review species delineation, resulting in confirmation that both D. psammophis and D. reticulata are full species and that some populations referred to D. r. cupreiceps Storr are not distinguishable from more typical D. reticulata. We also find the widespread central Australian population (treated by most authors as part of cupreiceps) to be specifically distinct. We redescribe D. psammophis and D. reticulata to clarify morphological and geographical boundaries and describe D. cyanochasma sp. nov. based on a combination of molecular genetic markers, details of colour and pattern, adult total length and a few morphometric attributes. We also designate a lectotype for D. psammophis from the original syntype series and comment on the necessity for further taxonomic refinement of this distinctive group.
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Affiliation(s)
- James H Nankivell
- School of Biological Sciences; University of Adelaide; Adelaide; South Australia 5005; AUSTRALIA; Faculty of Science & Engineering; Flinders University; Bedford Park; South Australia 5042; AUSTRALIA.
| | - Brad Maryan
- Research Associate; Collections & Research; Western Australian Museum; 49 Kew Street; Welshpool; Western Australia 6106; AUSTRALIA.
| | - Brian G Bush
- Snakes Harmful & Harmless; 9 Birch Place; Stoneville; Western Australia 6081; AUSTRALIA.
| | - Mark N Hutchinson
- South Australian Museum; North Terrace; Adelaide; South Australia 5000; AUSTRALIA; Faculty of Science & Engineering; Flinders University; Bedford Park; South Australia 5042; AUSTRALIA.
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17
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Butterworth NJ, Wallman JF, Johnston NP, Dawson BM, Sharp-Heward J, McGaughran A. The blowfly Chrysomya latifrons inhabits fragmented rainforests, but shows no population structure. Oecologia 2023; 201:703-719. [PMID: 36773072 PMCID: PMC10038970 DOI: 10.1007/s00442-023-05333-w] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2022] [Accepted: 01/27/2023] [Indexed: 02/12/2023]
Abstract
Climate change and deforestation are causing rainforests to become increasingly fragmented, placing them at heightened risk of biodiversity loss. Invertebrates constitute the greatest proportion of this biodiversity, yet we lack basic knowledge of their population structure and ecology. There is a compelling need to develop our understanding of the population dynamics of a wide range of rainforest invertebrates so that we can begin to understand how rainforest fragments are connected, and how they will cope with future habitat fragmentation and climate change. Blowflies are an ideal candidate for such research because they are widespread, abundant, and can be easily collected within rainforests. We genotyped 188 blowflies (Chrysomya latifrons) from 15 isolated rainforests and found high levels of gene flow, a lack of genetic structure between rainforests, and low genetic diversity - suggesting the presence of a single large genetically depauperate population. This highlights that: (1) the blowfly Ch. latifrons inhabits a ~ 1000 km stretch of Australian rainforests, where it plays an important role as a nutrient recycler; (2) strongly dispersing flies can migrate between and connect isolated rainforests, likely carrying pollen, parasites, phoronts, and pathogens along with them; and (3) widely dispersing and abundant insects can nevertheless be genetically depauperate. There is an urgent need to better understand the relationships between habitat fragmentation, genetic diversity, and adaptive potential-especially for poorly dispersing rainforest-restricted insects, as many of these may be particularly fragmented and at highest risk of local extinction.
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Affiliation(s)
- Nathan J Butterworth
- School of Biological Sciences, Monash University, Clayton, VIC, 3800, Australia.
- Faculty of Science, University of Technology Sydney, Ultimo, NSW, 2007, Australia.
| | - James F Wallman
- Faculty of Science, University of Technology Sydney, Ultimo, NSW, 2007, Australia
- Centre for Sustainable Ecosystem Solutions, School of Earth, Atmospheric and Life Sciences, University of Wollongong, Wollongong, NSW, 2522, Australia
| | - Nikolas P Johnston
- Faculty of Science, University of Technology Sydney, Ultimo, NSW, 2007, Australia
- Department of Ecology and Biogeography, Faculty of Biological and Veterinary Sciences, Nicolaus Copernicus University in Toruń, 87-100, Toruń, Poland
- Centre for Sustainable Ecosystem Solutions, School of Earth, Atmospheric and Life Sciences, University of Wollongong, Wollongong, NSW, 2522, Australia
| | - Blake M Dawson
- Centre for Sustainable Ecosystem Solutions, School of Earth, Atmospheric and Life Sciences, University of Wollongong, Wollongong, NSW, 2522, Australia
| | - Joshua Sharp-Heward
- Centre for Sustainable Ecosystem Solutions, School of Earth, Atmospheric and Life Sciences, University of Wollongong, Wollongong, NSW, 2522, Australia
| | - Angela McGaughran
- Te Aka Mātuatua - School of Science, University of Waikato, Private Bag 3105, Hamilton, 3240, New Zealand
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18
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Nikolic N, Devloo-Delva F, Bailleul D, Noskova E, Rougeux C, Delord C, Borsa P, Liautard-Haag C, Hassan M, Marie AD, Feutry P, Grewe P, Davies C, Farley J, Fernando D, Biton-Porsmoguer S, Poisson F, Parker D, Leone A, Aulich J, Lansdell M, Marsac F, Arnaud-Haond S. Stepping up to genome scan allows stock differentiation in the worldwide distributed blue shark Prionace glauca. Mol Ecol 2023; 32:1000-1019. [PMID: 36511846 DOI: 10.1111/mec.16822] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2022] [Revised: 11/29/2022] [Accepted: 12/01/2022] [Indexed: 12/15/2022]
Abstract
The blue shark Prionace glauca is a top predator with one of the widest geographical distributions of any shark species. It is classified as Critically Endangered in the Mediterranean Sea, and Near Threatened globally. Previous genetic studies did not reject the null hypothesis of a single global population. The blue shark was proposed as a possible archetype of the "grey zone of population differentiation," coined to designate cases where population structure may be too recent or too faint to be detected using a limited set of markers. Here, blue shark samples collected throughout its global range were sequenced using a specific RAD method (DArTseq), which recovered 37,655 genome-wide single nucleotide polymorphisms (SNPs). Two main groups emerged, with Mediterranean Sea and northern Atlantic samples (Northern population) differentiated significantly from the Indo-west Pacific samples (Southern population). Significant pairwise FST values indicated further genetic differentiation within the Atlantic Ocean, and between the Atlantic Ocean and the Mediterranean Sea. Reconstruction of recent demographic history suggested divergence between Northern and Southern populations occurred about 500 generations ago and revealed a drastic reduction in effective population size from a large ancestral population. Our results illustrate the power of genome scans to detect population structure and reconstruct demographic history in highly migratory marine species. Given that the management plans of the blue shark (targeted or bycatch) fisheries currently assume panmictic regional stocks, we strongly recommend that the results presented here be considered in future stock assessments and conservation strategies.
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Affiliation(s)
- Natacha Nikolic
- UMR MARBEC, University of Montpellier, IRD, Ifremer, CNRS, Sète, France.,INRAE, Ecobiop, AQUA, Saint-Pée-sur-Nivelle, France.,ARBRE, Agence de Recherche pour la Biodiversité à la Réunion, Saint-Gilles, France
| | - Floriaan Devloo-Delva
- CSIRO Environment, Hobart, Tasmania, Australia.,School of Natural Sciences-Quantitative Marine Science, University of Tasmania, Hobart, Tasmania, Australia
| | - Diane Bailleul
- UMR MARBEC, University of Montpellier, IRD, Ifremer, CNRS, Sète, France
| | - Ekaterina Noskova
- Computer Technologies Laboratory, ITMO University, St Petersburg, Russia
| | | | - Chrystelle Delord
- UMR MARBEC, University of Montpellier, IRD, Ifremer, CNRS, Sète, France
| | - Philippe Borsa
- Institut de recherche pour le développement, UMR ENTROPIE, Montpellier, France
| | | | - Mohamad Hassan
- UMR MARBEC, University of Montpellier, IRD, Ifremer, CNRS, Sète, France.,Animal Production Department, Tishreen University, Latakia, Syria
| | - Amandine D Marie
- ARBRE, Agence de Recherche pour la Biodiversité à la Réunion, Saint-Gilles, France
| | | | - Peter Grewe
- CSIRO Environment, Hobart, Tasmania, Australia
| | | | | | | | | | - François Poisson
- UMR MARBEC, University of Montpellier, IRD, Ifremer, CNRS, Sète, France
| | - Denham Parker
- Department of Forestry, Fisheries and the Environment, (DFFE), Cape Town, South Africa.,Department of Biological Sciences, University of Cape Town, Rondebosch, South Africa
| | - Agostino Leone
- UMR MARBEC, University of Montpellier, IRD, Ifremer, CNRS, Sète, France
| | | | | | - Francis Marsac
- UMR MARBEC, University of Montpellier, IRD, Ifremer, CNRS, Sète, France
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19
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Madsen T, Ujvari B, Bauwens D, Gruber B, Georges A, Klaassen M. Polyandry and non-random fertilisation maintain long-term genetic diversity in an isolated island population of adders (Vipera berus). Heredity (Edinb) 2023; 130:64-72. [PMID: 36474024 PMCID: PMC9905584 DOI: 10.1038/s41437-022-00578-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2022] [Revised: 11/09/2022] [Accepted: 11/12/2022] [Indexed: 12/12/2022] Open
Abstract
Conservation genetic theory suggests that small and isolated populations should be subject to reduced genetic diversity i.e., heterozygosity and allelic diversity. Our 34 years study of an isolated island population of adders (Vipera berus) in southern Sweden challenges this notion. Despite a lack of gene flow and a yearly mean estimated reproductive adult population size of only 65 adult adders (range 12-171), the population maintains high levels of heterozygosity and allelic diversity similar to that observed in two mainland populations. Even a 14-year major "bottleneck" i.e., a reduction in adult adder numbers, encompassing at least four adder generations, did not result in any reduction in the island adders' heterozygosity and allelic diversity. Female adders are polyandrous, and fertilisation is non-random, which our empirical data and modelling suggest are underpinning the maintenance of the population's high level of heterozygosity. Our empirical results and subsequent modelling suggest that the positive genetic effects of polyandry in combination with non-random fertilisation, often overlooked in conservation genetic analyses, deserve greater consideration when predicting long-term survival of small and isolated populations.
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Affiliation(s)
- Thomas Madsen
- Centre for Integrative Ecology, School of Life and Environmental Sciences, Deakin University, Waurn Ponds, VIC, 3217, Australia.
| | - Beata Ujvari
- Centre for Integrative Ecology, School of Life and Environmental Sciences, Deakin University, Waurn Ponds, VIC, 3217, Australia
| | - Dirk Bauwens
- Department of Biology, Laboratory of Functional Morphology, University of Antwerp, Wilrijk, Belgium
| | - Bernd Gruber
- Institute for Applied Ecology, University of Canberra, Canberra, ACT, 2601, Australia
| | - Arthur Georges
- Institute for Applied Ecology, University of Canberra, Canberra, ACT, 2601, Australia
| | - Marcel Klaassen
- Centre for Integrative Ecology, School of Life and Environmental Sciences, Deakin University, Waurn Ponds, VIC, 3217, Australia
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20
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Butler BO, Smith LL, Flores-Villela O. Phylogeography and taxonomy of Coleonyx elegans Gray 1845 (Squamata: Eublepharidae) in Mesoamerica: The Isthmus of Tehuantepec as an environmental barrier. Mol Phylogenet Evol 2023; 178:107632. [PMID: 36182052 DOI: 10.1016/j.ympev.2022.107632] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2022] [Revised: 08/05/2022] [Accepted: 09/23/2022] [Indexed: 12/14/2022]
Abstract
Population divergence leading to speciation is often explained by physical barriers causing allopatric distributions of historically connected populations. Environmental barriers have increasingly been shown to cause population divergence through local adaptation to distinct ecological characteristics. In this study, we evaluate population structuring and phylogeographic history within the Yucatán banded gecko Coleonyx elegans Gray 1845 to assess the role of both physical and environmental barriers in shaping the spatio-genetic distribution of a Mesoamerican tropical forest taxon. We generated RADseq and multi-locus Sanger datasets that included sampling across the entire species' range. Results find support for two distinct evolutionary lineages that diverged during the late Pliocene and show recent population expansions. Furthermore, these genetic lineages largely align with subspecies boundaries defined by morphology. Several mountain ranges identified as phylogeographic barriers in other taxa act as physical barriers to gene flow between the two clades. Despite the absence of a physical barrier between lineages across the lowland Isthmus of Tehuantepec, no introgression was observed. Here, a steep environmental cline associated with seasonality of precipitation corresponds exactly with the distributional limits of the lineages, whose closest samples are only 30 km apart. The combination of molecular and environmental evidence, and in conjunction with previous morphological evidence, allows us to reassess the current taxonomy in an integrative framework. Based on our findings, we elevate the previously recognized subspecies from the Pacific versant, the Colima banded gecko C. nemoralis Klauber 1945, to full species status and comment on conservation implications.
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Affiliation(s)
- Brett O Butler
- Museo de Zoología "Alfonso L. Herrera", Facultad de Ciencias, Universidad Nacional Autónoma de México, Av. Ciudad Universitaria 3000, C. P. 04510 Coyoacán, CDMX, Mexico; Posgrado en Ciencias Biológicas, Universidad Nacional Autónoma de México, Av. Ciudad Universitaria 3000, C. P. 04510 Coyoacán, CDMX, Mexico.
| | - Lydia L Smith
- Museum of Vertebrate Zoology, 3101 Valley Life Sciences Building, University of California, Berkeley, CA 94720, USA
| | - Oscar Flores-Villela
- Museo de Zoología "Alfonso L. Herrera", Facultad de Ciencias, Universidad Nacional Autónoma de México, Av. Ciudad Universitaria 3000, C. P. 04510 Coyoacán, CDMX, Mexico
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21
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Mijangos JL, Bino G, Hawke T, Kolomyjec SH, Kingsford RT, Sidhu H, Grant T, Day J, Dias KN, Gongora J, Sherwin WB. Fragmentation by major dams and implications for the future viability of platypus populations. Commun Biol 2022; 5:1127. [PMID: 36329312 PMCID: PMC9633709 DOI: 10.1038/s42003-022-04038-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2022] [Accepted: 09/27/2022] [Indexed: 11/06/2022] Open
Abstract
The evolutionarily unique platypus (Ornithorhynchus anatinus) has experienced major declines and extinctions from a range of historical and recent interacting human-mediated threats. Although spending most of their time in the water, platypuses can move over land. Nevertheless, uncertainties remain whether dams are barriers to movement, thus limiting gene flow and dispersal, essential to evolution and ecology. Here we examined disruption of gene flow between platypus groups below and above five major dams, matched to four adjacent rivers without major dams. Genetic differentiation (FST) across dams was 4- to 20-fold higher than along similar stretches of adjacent undammed rivers; FST across dams was similar to differentiation between adjacent river systems. This indicates that major dams represent major barriers for platypus movements. Furthermore, FST between groups was correlated with the year in which the dam was built, increasing by 0.011 every generation, reflecting the effects of these barriers on platypus genetics. This study provides evidence of gene flow restriction, which jeopardises the long-term viability of platypus populations when groups are fragmented by major dams. Mitigation strategies, such as building of by-pass structures and translocation between upstream and downstream of the dam, should be considered in conservation and management planning.
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Affiliation(s)
- Jose L. Mijangos
- grid.1005.40000 0004 4902 0432School of Science, UNSW, Canberra, Australia ,grid.1039.b0000 0004 0385 7472Centre for Conservation Ecology and Genomics, Institute for Applied Ecology, University of Canberra, Canberra, Australia
| | - Gilad Bino
- grid.1005.40000 0004 4902 0432Centre for Ecosystem Science, School of Biological, Earth and Environmental Sciences, UNSW, Sydney, Australia
| | - Tahneal Hawke
- grid.1005.40000 0004 4902 0432Centre for Ecosystem Science, School of Biological, Earth and Environmental Sciences, UNSW, Sydney, Australia
| | - Stephen H. Kolomyjec
- grid.258898.60000 0004 0462 9201College of Science and the Environment, Lake Superior State University, Sault Sainte Marie, USA
| | - Richard T. Kingsford
- grid.1005.40000 0004 4902 0432Centre for Ecosystem Science, School of Biological, Earth and Environmental Sciences, UNSW, Sydney, Australia
| | - Harvinder Sidhu
- grid.1005.40000 0004 4902 0432School of Science, UNSW, Canberra, Australia
| | - Tom Grant
- grid.1005.40000 0004 4902 0432Centre for Ecosystem Science, School of Biological, Earth and Environmental Sciences, UNSW, Sydney, Australia
| | - Jenna Day
- grid.1013.30000 0004 1936 834XSydney School of Veterinary Science, Faculty of Science, The University of Sydney, Sydney, Australia
| | - Kimberly N. Dias
- grid.1013.30000 0004 1936 834XSydney School of Veterinary Science, Faculty of Science, The University of Sydney, Sydney, Australia
| | - Jaime Gongora
- grid.1013.30000 0004 1936 834XSydney School of Veterinary Science, Faculty of Science, The University of Sydney, Sydney, Australia
| | - William B. Sherwin
- grid.1005.40000 0004 4902 0432Evolution & Ecology Research Centre, UNSW, Sydney, Australia
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22
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Wilson TC, Rossetto M, Bain D, Yap JS, Wilson PD, Stimpson ML, Weston PH, Croft L. A turn in species conservation for hairpin banksias: demonstration of oversplitting leads to better management of diversity. AMERICAN JOURNAL OF BOTANY 2022; 109:1652-1671. [PMID: 36164832 PMCID: PMC9828017 DOI: 10.1002/ajb2.16074] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/07/2022] [Revised: 08/29/2022] [Accepted: 08/30/2022] [Indexed: 06/16/2023]
Abstract
PREMISE Understanding evolutionary history and classifying discrete units of organisms remain overwhelming tasks, and lags in this workload concomitantly impede an accurate documentation of biodiversity and conservation management. Rapid advances and improved accessibility of sensitive high-throughput sequencing tools are fortunately quickening the resolution of morphological complexes and thereby improving the estimation of species diversity. The recently described and critically endangered Banksia vincentia is morphologically similar to the hairpin banksia complex (B. spinulosa s.l.), a group of eastern Australian flowering shrubs whose continuum of morphological diversity has been responsible for taxonomic controversy and possibly questionable conservation initiatives. METHODS To assist conservation while testing the current taxonomy of this group, we used high-throughput sequencing to infer a population-scale evolutionary scenario for a sample set that is comprehensive in its representation of morphological diversity and a 2500-km distribution. RESULTS Banksia spinulosa s.l. represents two clades, each with an internal genetic structure shaped through historical separation by biogeographic barriers. This structure conflicts with the existing taxonomy for the group. Corroboration between phylogeny and population statistics aligns with the hypothesis that B. collina, B. neoanglica, and B. vincentia should not be classified as species. CONCLUSIONS The pattern here supports how morphological diversity can be indicative of a locally expressed suite of traits rather than relationship. Oversplitting in the hairpin banksias is atypical since genomic analyses often reveal that species diversity is underestimated. However, we show that erring on overestimation can yield negative consequences, such as the disproportionate prioritization of a geographically anomalous population.
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Affiliation(s)
- Trevor C. Wilson
- Plant Discovery and Evolution, Australian Institute of Botanical ScienceRoyal Botanic Gardens and Domain TrustSydneyAustralia
- Research Centre for Ecosystem Resilience, Australian Institute of Botanical ScienceThe Royal Botanic Garden SydneyAustralia
| | - Maurizio Rossetto
- Research Centre for Ecosystem Resilience, Australian Institute of Botanical ScienceThe Royal Botanic Garden SydneyAustralia
| | - David Bain
- Ecosystems and Threatened Species, Biodiversity Conservation and ScienceNSW Department of Planning and EnvironmentWollongongAustralia
| | - Jia‐Yee S. Yap
- Research Centre for Ecosystem Resilience, Australian Institute of Botanical ScienceThe Royal Botanic Garden SydneyAustralia
| | - Peter D. Wilson
- Research Centre for Ecosystem Resilience, Australian Institute of Botanical ScienceThe Royal Botanic Garden SydneyAustralia
| | - Margaret L. Stimpson
- Botany, School of Environmental and Rural ScienceUniversity of New EnglandArmidaleNSW2351Australia
| | - Peter H. Weston
- Plant Discovery and Evolution, Australian Institute of Botanical ScienceRoyal Botanic Gardens and Domain TrustSydneyAustralia
| | - Larry Croft
- Centre of Integrative Ecology, School of Life and Environmental SciencesDeakin UniversityGeelong3125VictoriaAustralia
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23
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Rutherford S, Wilson TC, Yap JYS, Lee E, Errington G, Rossetto M. Evolutionary processes in an undescribed eucalypt: implications for the translocation of a critically endangered species. ANNALS OF BOTANY 2022; 130:491-508. [PMID: 35802354 PMCID: PMC9510949 DOI: 10.1093/aob/mcac091] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/11/2022] [Accepted: 07/07/2022] [Indexed: 06/15/2023]
Abstract
BACKGROUND AND AIMS Knowledge of the evolutionary processes responsible for the distribution of threatened and highly localized species is important for their conservation. Population genomics can provide insights into evolutionary processes to inform management practices, including the translocation of threatened plant species. In this study, we focus on a critically endangered eucalypt, Eucalyptus sp. Cattai, which is restricted to a 40-km2 area of Sydney, Australia, and is threatened by increased urbanization. Eucalyptus sp. Cattai has yet to be formally described in part due to its suspected hybrid origin. Here, we examined evolutionary processes and species boundaries in E. sp. Cattai to determine whether translocation was warranted. METHODS We used genome-wide scans to investigate the evolutionary relationships of E. sp. Cattai with related species, and to assess levels of genetic health and admixture. Morphological trait and genomic data were obtained from seedlings of E. sp. Cattai propagated in a common garden to assess their genetic provenance and hybrid status. KEY RESULTS All analyses revealed that E. sp. Cattai was strongly supported as a distinct species. Genetic diversity varied across populations, and clonality was unexpectedly high. Interspecific hybridization was detected, and was more prevalent in seedlings compared to in situ adult plants, indicating that post-zygotic barriers may restrict the establishment of hybrids. CONCLUSIONS Multiple evolutionary processes (e.g. hybridization and clonality) can operate within one rare and restricted species. Insights regarding evolutionary processes from our study were used to assist with the translocation of genetically 'pure' and healthy ex situ seedlings to nearby suitable habitat. Our findings demonstrate that it is vital to provide an understanding of evolutionary relationships and processes with an examination of population genomics in the design and implementation of an effective translocation strategy.
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Affiliation(s)
| | - Trevor C Wilson
- Research Centre for Ecosystem Resilience, Australian Institute of Botanic Science, Royal Botanic Garden Sydney, Sydney, Australia
| | - Jia-Yee Samantha Yap
- Research Centre for Ecosystem Resilience, Australian Institute of Botanic Science, Royal Botanic Garden Sydney, Sydney, Australia
| | - Enhua Lee
- Biodiversity and Conservation Division, New South Wales Department of Planning and Environment, Sydney, Australia
| | - Graeme Errington
- Australian PlantBank, Australian Institute of Botanical Science, Australian Botanic Garden, Mount Annan, New South Wales, Australia
| | - Maurizio Rossetto
- Research Centre for Ecosystem Resilience, Australian Institute of Botanic Science, Royal Botanic Garden Sydney, Sydney, Australia
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24
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Hare RM, Kennington WJ, Simmons LW. Evolutionary divergence via sexual selection acting on females in a species with sex role reversal. Funct Ecol 2022. [DOI: 10.1111/1365-2435.14174] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Robin M. Hare
- Centre for Evolutionary Biology, School of Biological Sciences University of Western Australia Perth Australia
| | - W. Jason Kennington
- Centre for Evolutionary Biology, School of Biological Sciences University of Western Australia Perth Australia
| | - Leigh W. Simmons
- Centre for Evolutionary Biology, School of Biological Sciences University of Western Australia Perth Australia
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25
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Jaya FR, Tanner JC, Whitehead MR, Doughty P, Keogh JS, Moritz CC, Catullo RA. Population genomics and sexual signals support reproductive character displacement in Uperoleia (Anura: Myobatrachidae) in a contact zone. Mol Ecol 2022; 31:4527-4543. [PMID: 35780470 PMCID: PMC9542136 DOI: 10.1111/mec.16597] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2022] [Revised: 06/14/2022] [Accepted: 06/24/2022] [Indexed: 11/30/2022]
Abstract
When closely related species come into contact via range expansion, both may experience reduced fitness as a result of the interaction. Selection is expected to favour traits that minimize costly interspecies reproductive interactions (such as mismating) via a phenomenon called reproductive character displacement (RCD). Research on RCD frequently assumes secondary contact between species, but the geographical history of species interactions is often unknown. Population genomic data permit tests of geographical hypotheses about species origins and secondary contact through range expansion. We used population genomic data from single nucleotide polymorphisms (SNPs), mitochondrial sequence data, advertisement call data and morphological data to investigate a species complex of toadlets (Uperoleia borealis, U. crassa, U. inundata) from northern Australia. Although the three species of frogs were morphologically indistinguishable in our analysis, we determined that U. crassa and U. inundata form a single species (synonymized here) based on an absence of genomic divergence. SNP data identified the phylogeographical origin of U. crassa as the Top End, with subsequent westward invasion into the range of U. borealis in the Kimberley. We identified six F1 hybrids, all of which had the U. borealis mitochondrial haplotype, suggesting unidirectional hybridization. Consistent with the RCD hypothesis, U. borealis and U. crassa sexual signals differ more in sympatry than in allopatry. Hybrid males have intermediate calls, which probably reduces attractiveness to females. Integrating population genomic data, mitochondrial sequencing, morphology and behavioural approaches provides an unusually detailed collection of evidence for reproductive character displacement following range expansion and secondary contact.
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Affiliation(s)
- Frederick R. Jaya
- Australian Institute for Microbiology and InfectionUniversity of Technology SydneyUltimoNew South WalesAustralia
| | - Jessie C. Tanner
- Centre for Evolutionary Biology, School of Biological SciencesUniversity of Western AustraliaCrawleyWestern AustraliaAustralia
| | | | - Paul Doughty
- Western Australian MuseumPerthWestern AustraliaAustralia
| | - J. Scott Keogh
- Centre for Biodiversity Analysis, Ecology & Evolution, Research School of BiologyAustralian National UniversityActonAustralian Capital TerritoryAustralia
| | - Craig C. Moritz
- Centre for Biodiversity Analysis, Ecology & Evolution, Research School of BiologyAustralian National UniversityActonAustralian Capital TerritoryAustralia
| | - Renee A. Catullo
- Centre for Evolutionary Biology, School of Biological SciencesUniversity of Western AustraliaCrawleyWestern AustraliaAustralia
- Centre for Biodiversity Analysis, Ecology & Evolution, Research School of BiologyAustralian National UniversityActonAustralian Capital TerritoryAustralia
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26
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Kvistad L, Falk S, Austin L. Widespread genomic signatures of reproductive isolation and sex-specific selection in the Eastern Yellow Robin, Eopsaltria australis. G3 GENES|GENOMES|GENETICS 2022; 12:6605223. [PMID: 35686912 PMCID: PMC9438485 DOI: 10.1093/g3journal/jkac145] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/10/2021] [Accepted: 05/31/2022] [Indexed: 11/16/2022]
Abstract
How new species evolve is one of the most fundamental questions in biology. Population divergence, which may lead to speciation, may be occurring in the Eastern Yellow Robin, a common passerine that lives along the eastern coast of Australia. This species is composed of 2 parapatric lineages that have highly divergent mitochondrial DNA; however, similar levels of divergence have not been observed in the nuclear genome. Here we re-examine the nuclear genomes of these mitolineages to test potential mechanisms underlying the discordance between nuclear and mitochondrial divergence. We find that nuclear admixture occurs in a narrow hybrid zone, although the majority of markers across the genome show evidence of reproductive isolation between populations of opposing mitolineages. There is an 8 MB section of a previously identified putative neo-sex chromosome that is highly diverged between allopatric but not parapatric populations, which may be the result of a chromosomal inversion. The neo-sex chromosomal nature of this region, as well as the geographic patterns in which it exhibits divergence, suggest it is unlikely to be contributing to reproductive isolation through mitonuclear incompatibilities as reported in earlier studies. In addition, there are sex differences in the number of markers that are differentiated between populations of opposite mitolineages, with greater differentiation occurring in females, which are heterozygous, than males. These results suggest that, despite the absence of previously observed assortative mating, mitolineages of Eastern Yellow Robin experience at least some postzygotic isolation from each other, in a pattern consistent with Haldane’s Rule.
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Affiliation(s)
- Lynna Kvistad
- Biological Sciences, Monash University , Clayton, VIC 3800, Australia
| | - Stephanie Falk
- Biological Sciences, Monash University , Clayton, VIC 3800, Australia
- Deep Sequencing Facility, Max Planck Institute of Immunobiology and Epigenetics , Freiburg D-79108, Germany
| | - Lana Austin
- Biological Sciences, Monash University , Clayton, VIC 3800, Australia
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27
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Chambers EA, Marshall TL, Hillis DM. The Importance of Contact Zones for Distinguishing Interspecific from Intraspecific Geographic Variation. Syst Biol 2022:6673165. [PMID: 35993885 DOI: 10.1093/sysbio/syac056] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2022] [Revised: 06/17/2022] [Accepted: 08/08/2022] [Indexed: 11/13/2022] Open
Abstract
With limited sampling, geographic variation within a single species can be difficult to distinguish from interspecific variation, confounding our ability to draw accurate species boundaries. We argue that thorough sampling and analysis of contact zones between putative taxa can determine if assortative mating or selection against hybrids exists (supporting the presence of two distinct species), or alternatively if mating is random among genotypes and admixture among adjacent populations is gradual and continuous (supporting geographic variation within a single species). Here, we test two alternative hypotheses for two pairs of named taxa at contact zones within the American milksnake (Lampropeltis triangulum) complex. A prior morphological analysis found areas of gradual intergradation among named taxa, and concluded that the taxa represented geographical races of a single polytypic species. In contrast, a subsequent analysis of gene sequence data, but with limited sampling near the contact zones, hypothesized distinct boundaries between species at the contact zones. At the contact zone between proposed species L. triangulum and L. gentilis, we examined a ∼700 km-wide transect across the states of Kansas and Missouri, with thorough sampling and reduced-representation genomic-level sequencing, to test the two opposing taxonomic hypotheses. Our transect analyses included examinations of population structure, fixed differences, cline-fitting, and an admixture index analysis. These analyses all supported a gradual and continuous geographic cline across a broad intergrade zone between two geographic forms of L. triangulum, thus providing strong support for a single species in this region (and no support for the recognition of L. gentilis as a distinct species). At a second contact zone between proposed species L. triangulum and L. elapsoides (but variously treated as species or subspecies by different researchers) in Kentucky and Tennessee, we re-evaluated morphological data. In this case, the contact zone analysis indicated sympatry and reproductive isolation of the two taxa, and thus strongly supported L. triangulum and L. elapsoides as distinct species. We conclude that detailed studies of contact zones, based on either genetic or morphological data, are essential for distinguishing intraspecific from interspecific variation in the case of widely and continuously distributed taxa.
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Affiliation(s)
- E Anne Chambers
- Department of Integrative Biology and Biodiversity Center, The University of Texas at Austin, Austin TX 78712 USA.,Department of Environmental Science, Policy, and Management, The University of California Berkeley, Berkeley CA 94720 USA
| | - Thomas L Marshall
- Department of Integrative Biology and Biodiversity Center, The University of Texas at Austin, Austin TX 78712 USA
| | - David M Hillis
- Department of Integrative Biology and Biodiversity Center, The University of Texas at Austin, Austin TX 78712 USA
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28
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Thacker CE, Geiger DL, Unmack PJ. Species delineation and systematics of a hemiclonal hybrid complex in Australian freshwaters (Gobiiformes: Gobioidei: Eleotridae: Hypseleotris). ROYAL SOCIETY OPEN SCIENCE 2022; 9:220201. [PMID: 35911191 PMCID: PMC9326278 DOI: 10.1098/rsos.220201] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/17/2022] [Accepted: 07/05/2022] [Indexed: 06/15/2023]
Abstract
The rivers of southeastern Australia host a species complex within the carp gudgeon genus Hypseleotris that includes parental species and hemiclonal hybrid lineages. These hemiclones can be difficult to distinguish from their parent taxa, making delineation of species unusually difficult. We approach this historical taxonomic problem by using single nucleotide polymorphism (SNP) genotyping to distinguish individuals of each species and hemiclones, enabling us to quantify the variation among evolutionary lineages and assign names to the species. Hypseleotris klunzingeri remains valid and does not have any hemiclones. We describe Hypseleotris bucephala and Hypseleotris gymnocephala from the Murray-Darling Basin and Hypseleotris acropinna from the Murray-Darling as well as eastern coastal streams north of the Mary River, part of the range attributed to H. galii. We further split H. galii to distinguish a species from the Mary River, Hypseleotris moolooboolaensis. We designate a neotype and redescribe H. galii due to uncertainty about the source and species identity of specimens used in the original description. We reconcile previous taxonomies, provide new common names for parental species, and advocate using the scientific names of both parents when referring to the hemiclone hybrids to avoid confusion with previous common names that did not distinguish parental taxa and hemiclones.
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Affiliation(s)
- Christine E. Thacker
- Department of Vertebrate Zoology, Santa Barbara Museum of Natural History, 2559 Puesta del Sol, Santa Barbara, CA 93105, USA
- Research and Collections, Section of Ichthyology, Natural History Museum of Los Angeles County, 900 Exposition Blvd., Los Angeles, CA 90007, USA
| | - Daniel L. Geiger
- Department of Invertebrate Zoology, Santa Barbara Museum of Natural History, 2559 Puesta del Sol, Santa Barbara, CA 93105, USA
| | - Peter J. Unmack
- Centre for Applied Water Science, Institute for Applied Ecology, University of Canberra, Canberra, ACT 2601, Australia
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29
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Mijangos JL, Gruber B, Berry O, Pacioni C, Georges A.
dartR
v2: an accessible genetic analysis platform for conservation, ecology, and agriculture. Methods Ecol Evol 2022. [DOI: 10.1111/2041-210x.13918] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Affiliation(s)
- Jose Luis Mijangos
- Centre for Conservation Ecology and Genomics, Institute for Applied Ecology University of Canberra Bruce ACT Australia
| | - Bernd Gruber
- Centre for Conservation Ecology and Genomics, Institute for Applied Ecology University of Canberra Bruce ACT Australia
| | - Oliver Berry
- Environomics Future Science Platform, Indian Ocean Marine Research Centre, Commonwealth Scientific and Industrial Research Organisation (CSIRO) Crawley WA Australia
| | - Carlo Pacioni
- Department of Environment, Land, Water, and Planning Arthur Rylah Institute for Environmental Research Heidelberg VIC Australia
- Environmental and Conservation Sciences School of Veterinary and Life Sciences, Murdoch University Murdoch WA Australia
| | - Arthur Georges
- Centre for Conservation Ecology and Genomics, Institute for Applied Ecology University of Canberra Bruce ACT Australia
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30
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DeRaad DA, McCormack JE, Chen N, Peterson AT, Moyle RG. Combining Species Delimitation, Species Trees, and Tests for Gene Flow Clarifies Complex Speciation in Scrub-Jays. Syst Biol 2022; 71:1453-1470. [PMID: 35552760 DOI: 10.1093/sysbio/syac034] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2021] [Revised: 05/02/2022] [Accepted: 05/06/2022] [Indexed: 11/13/2022] Open
Abstract
Complex speciation, involving rapid divergence and multiple bouts of post-divergence gene flow, can obfuscate phylogenetic relationships and species limits. In North America, cases of complex speciation are common, due at least in part to the cyclical Pleistocene glacial history of the continent. Scrub-jays in the genus Aphelocoma provide a useful case study in complex speciation because their range throughout North America is structured by phylogeographic barriers with multiple cases of secondary contact between divergent lineages. Here, we show that a comprehensive approach to genomic reconstruction of evolutionary history, i.e., synthesizing results from species delimitation, species tree reconstruction, demographic model testing, and tests for gene flow, is capable of clarifying evolutionary history despite complex speciation. We find concordant evidence across all statistical approaches for the distinctiveness of an endemic southern Mexico lineage (A. w. sumichrasti), culminating in support for the species status of this lineage under any commonly applied species concept. We also find novel genomic evidence for the species status of a Texas endemic lineage A. w. texana, for which equivocal species delimitation results were clarified by demographic modeling and spatially explicit models of gene flow. Finally, we find that complex signatures of both ancient and modern gene flow between the non-sister California Scrub-Jay (A. californica) and Woodhouse's Scrub-Jay (A. woodhouseii), result in discordant gene trees throughout the species' genomes despite clear support for their overall isolation and species status. In sum, we find that a multi-faceted approach to genomic analysis can increase our understanding of complex speciation histories, even in well-studied groups. Given the emerging recognition that complex speciation is relatively commonplace, the comprehensive framework that we demonstrate for interrogation of species limits and evolutionary history using genomic data can provide a necessary roadmap for disentangling the impacts of gene flow and incomplete lineage sorting to better understand the systematics of other groups with similarly complex evolutionary histories.
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Affiliation(s)
- Devon A DeRaad
- Biodiversity Institute and Department of Ecology and Evolutionary Biology, University of Kansas, Lawrence KS, 66045, USA
| | - John E McCormack
- Moore Laboratory of Zoology,Occidental College, Los Angeles, CA, 90041, USA
| | - Nancy Chen
- Department of Biology, University of Rochester, Rochester, NY, 14627, USA
| | - A Townsend Peterson
- Biodiversity Institute and Department of Ecology and Evolutionary Biology, University of Kansas, Lawrence KS, 66045, USA
| | - Robert G Moyle
- Biodiversity Institute and Department of Ecology and Evolutionary Biology, University of Kansas, Lawrence KS, 66045, USA
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31
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Pavón-Vázquez CJ, Esquerré D, Fitch AJ, Maryan B, Doughty P, Donnellan SC, Scott Keogh J. Between a rock and a dry place: phylogenomics, biogeography, and systematics of ridge-tailed monitors (Squamata: Varanidae: Varanus acanthurus complex). Mol Phylogenet Evol 2022; 173:107516. [DOI: 10.1016/j.ympev.2022.107516] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2022] [Revised: 03/25/2022] [Accepted: 04/06/2022] [Indexed: 11/16/2022]
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32
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Umbrello L, Bullen R, Shaw R, McArthur S, Byrne M, van Leeuwen S, Ottewell K. Extensive gene flow in a threatened bat (Rhinonicteris aurantia) in an arid landscape. Glob Ecol Conserv 2022. [DOI: 10.1016/j.gecco.2022.e02154] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
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33
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Vernygora OV, Campbell EO, Grishin NV, Sperling FA, Dupuis JR. Gauging ages of tiger swallowtail butterflies using alternate SNP analyses. Mol Phylogenet Evol 2022; 171:107465. [DOI: 10.1016/j.ympev.2022.107465] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2022] [Revised: 02/26/2022] [Accepted: 03/15/2022] [Indexed: 10/18/2022]
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34
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Dissanayake DSB, Holleley CE, Sumner J, Melville J, Georges A. Lineage diversity within a widespread endemic Australian skink to better inform conservation in response to regional-scale disturbance. Ecol Evol 2022; 12:e8627. [PMID: 35342559 PMCID: PMC8928872 DOI: 10.1002/ece3.8627] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2021] [Revised: 01/20/2022] [Accepted: 01/25/2022] [Indexed: 11/07/2022] Open
Abstract
Much attention is paid in conservation planning to the concept of a species, to ensure comparability across studies and regions when classifying taxa against criteria of endangerment and setting priorities for action. However, various jurisdictions now allow taxonomic ranks below the level of species and nontaxonomic intraspecific divisions to be factored into conservation planning—subspecies, key populations, evolutionarily significant units, or designatable units. Understanding patterns of genetic diversity and its distribution across the landscape is a key component in the identification of species boundaries and determination of substantial geographic structure within species. A total of 12,532 reliable polymorphic SNP loci were generated from 63 populations (286 individuals) covering the distribution of the Australian eastern three‐lined skink, Bassiana duperreyi, to assess genetic population structure in the form of diagnosable lineages and their distribution across the landscape, with particular reference to the recent catastrophic bushfires of eastern Australia. Five well‐supported diagnosable operational taxonomic units (OTUs) existed within B. duperreyi. Low levels of divergence of B. duperreyi between mainland Australia and Tasmania (no fixed allelic differences) support the notion of episodic exchange of alleles across Bass Strait (ca 60 m, 25 Kya) during periods of low sea level during the Upper Pleistocene rather than the much longer period of isolation (1.7 My) indicated by earlier studies using mitochondrial sequence variation. Our study provides foundational work for the detailed taxonomic re‐evaluation of this species complex and the need for biodiversity assessment to include an examination of cryptic species and/or cryptic diversity below the level of species. Such information on lineage diversity within species and its distribution in the context of disturbance at a regional scale can be factored into conservation planning regardless of whether a decision is made to formally diagnose new species taxonomically and nomenclaturally.
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Affiliation(s)
- Duminda S B Dissanayake
- Institute for Applied Ecology University of Canberra Canberra Australian Capital Territory Australia.,Australian National Wildlife Collection CSIRO Canberra Australian Capital Territory Australia
| | - Clare E Holleley
- Institute for Applied Ecology University of Canberra Canberra Australian Capital Territory Australia.,Australian National Wildlife Collection CSIRO Canberra Australian Capital Territory Australia
| | - Joanna Sumner
- Department of Sciences Museums Victoria Carlton Gardens Victoria Australia
| | - Jane Melville
- Department of Sciences Museums Victoria Carlton Gardens Victoria Australia
| | - Arthur Georges
- Institute for Applied Ecology University of Canberra Canberra Australian Capital Territory Australia
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35
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Wild KH, Roe JH, Schwanz L, Georges A, Sarre SD. Evolutionary stability inferred for a free ranging lizard with sex-reversal. Mol Ecol 2022; 31:2281-2292. [PMID: 35178809 PMCID: PMC9303591 DOI: 10.1111/mec.16404] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2021] [Revised: 02/02/2022] [Accepted: 02/11/2022] [Indexed: 11/17/2022]
Abstract
The sex of vertebrates is typically determined genetically, but reptile sex can also be determined by developmental temperature. In some reptiles, temperature interacts with genotype to reverse sex, potentially leading to transitions from a chromosomal to a temperature‐dependent sex determining system. Transitions between such systems in nature are accelerated depending on the frequency and fitness of sex‐reversed individuals. The Central Bearded Dragon, Pogona vitticeps, exhibits female heterogamety (ZZ/ZW) but can have its sex reversed from ZZ male to ZZ female by high incubation temperatures. The species exhibits sex‐reversal in the wild and it has been suggested that climate change and fitness of sex‐reversed individuals could be increasing the frequency of reversal within the species range. Transitions to temperature‐dependent sex determination require low levels of dispersal and high (>50%) rates of sex‐reversal. Here, we combine genotype‐by‐sequencing, identification of phenotypic and chromosomal sex, exhaustive field surveys, and radio telemetry to examine levels of genetic structure, rates of sex‐reversal, movement, space use, and survival of P. vitticeps in a location previously identified as a hot spot for sex‐reversal. We find that the species exhibits low levels of population structure (FST ~0.001) and a modest (~17%) rate of sex‐reversal, and that sex‐reversed and nonsex‐reversed females have similar survival and behavioural characteristics to each other. Overall, our data indicate this system is evolutionary stable, although we do not rule out the prospect of a more gradual transition in sex‐determining mechanisms in the future in a more fragmented landscape and as global temperatures increase.
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Affiliation(s)
- Kristoffer H Wild
- Centre for Conservation Ecology and Genomics, Institute for Applied Ecology, University of Canberra, Canberra, ACT, Australia
| | - John H Roe
- Department of Biology, University of North Carolina Pembroke, Pembroke, North Carolina, USA
| | - Lisa Schwanz
- Evolution and Ecology Research Centre, School of Biological, Earth and Environmental Sciences, University of New South Wales, Sydney, NSW, Australia
| | - Arthur Georges
- Centre for Conservation Ecology and Genomics, Institute for Applied Ecology, University of Canberra, Canberra, ACT, Australia
| | - Stephen D Sarre
- Centre for Conservation Ecology and Genomics, Institute for Applied Ecology, University of Canberra, Canberra, ACT, Australia
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Lassauce H, Dudgeon CL, Armstrong AJ, Wantiez L, Carroll EL. Evidence of fine scale genetic structure for reef manta rays Mobula alfredi in New Caledonia. ENDANGER SPECIES RES 2022. [DOI: 10.3354/esr01178] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
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Unmack PJ, Adams M, Hammer MP, Johnson JB, Gruber B, Gilles A, Young M, Georges A. Plotting for change: an analytical framework to aid decisions on which lineages are candidate species in phylogenomic species discovery. Biol J Linn Soc Lond 2021. [DOI: 10.1093/biolinnean/blab095] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Abstract
A recent study argued that coalescent-based models of species delimitation mostly delineate population structure, not species, and called for the validation of candidate species using biological information additional to the genetic information, such as phenotypic or ecological data. Here, we introduce a framework to interrogate genomic datasets and coalescent-based species trees for the presence of candidate species in situations where additional biological data are unavailable, unobtainable or uninformative. For de novo genomic studies of species boundaries, we propose six steps: (1) visualize genetic affinities among individuals to identify both discrete and admixed genetic groups from first principles and to hold aside individuals involved in contemporary admixture for independent consideration; (2) apply phylogenetic techniques to identify lineages; (3) assess diagnosability of those lineages as potential candidate species; (4) interpret the diagnosable lineages in a geographical context (sympatry, parapatry, allopatry); (5) assess significance of difference or trends in the context of sampling intensity; and (6) adopt a holistic approach to available evidence to inform decisions on species status in the difficult cases of allopatry. We adopt this approach to distinguish candidate species from within-species lineages for a widespread species complex of Australian freshwater fishes (Retropinna spp.). Our framework addresses two cornerstone issues in systematics that are often not discussed explicitly in genomic species discovery: diagnosability and how to determine it, and what criteria should be used to decide whether diagnosable lineages are conspecific or represent different species.
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Affiliation(s)
- Peter J Unmack
- Institute for Applied Ecology, University of Canberra, Bruce, ACT, Australia
- Centre for Applied Water Science, Institute for Applied Ecology, University of Canberra, Bruce, ACT, Australia
- Department of Biology, Brigham Young University, Provo, UT, USA
| | - Mark Adams
- Institute for Applied Ecology, University of Canberra, Bruce, ACT, Australia
- Department of Biological Sciences, University of Adelaide, Adelaide, SA, Australia
| | - Michael P Hammer
- Museum & Art Gallery of the Northern Territory, Darwin, NT, Australia
| | - Jerald B Johnson
- Department of Biology, Brigham Young University, Provo, UT, USA
- Monte L. Bean Life Science Museum, Brigham Young University, Provo, UT, USA
| | - Bernd Gruber
- Institute for Applied Ecology, University of Canberra, Bruce, ACT, Australia
| | - André Gilles
- UMR 1467 RECOVER, Aix Marseille Univ, INRAE, Centre St Charles, 3 place Victor Hugo, Marseille, France
| | - Matthew Young
- Institute for Applied Ecology, University of Canberra, Bruce, ACT, Australia
| | - Arthur Georges
- Institute for Applied Ecology, University of Canberra, Bruce, ACT, Australia
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Ferrante JA, Smith CH, Thompson LM, Hunter ME. Genome-wide SNP analysis of three moose subspecies at the southern range limit in the contiguous United States. CONSERV GENET 2021. [DOI: 10.1007/s10592-021-01402-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
AbstractGenome-wide evaluations of genetic diversity and population structure are important for informing management and conservation of trailing-edge populations. North American moose (Alces alces) are declining along portions of the southern edge of their range due to disease, species interactions, and marginal habitat, all of which may be exacerbated by climate change. We employed a genotyping by sequencing (GBS) approach in an effort to collect baseline information on the genetic variation of moose inhabiting the species’ southern range periphery in the contiguous United States. We identified 1920 single nucleotide polymorphisms (SNPs) from 155 moose representing three subspecies from five states: A. a. americana (New Hampshire), A. a. andersoni (Minnesota), and A. a. shirasi (Idaho, Montana, and Wyoming). Molecular analyses supported three geographically isolated clusters, congruent with currently recognized subspecies. Additionally, while moderately low genetic diversity was observed, there was little evidence of inbreeding. Results also indicated > 20% shared ancestry proportions between A. a. shirasi samples from northern Montana and A. a. andersoni samples from Minnesota, indicating a putative hybrid zone warranting further investigation. GBS has proven to be a simple and effective method for genome-wide SNP discovery in moose and provides robust data for informing herd management and conservation priorities. With increasing disease, predation, and climate related pressure on range edge moose populations in the United States, the use of SNP data to identify gene flow between subspecies may prove a powerful tool for moose management and recovery, particularly if hybrid moose are more able to adapt.
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Burbrink FT, Ruane S. Contemporary Philosophy and Methods for Studying Speciation and Delimiting Species. ICHTHYOLOGY & HERPETOLOGY 2021. [DOI: 10.1643/h2020073] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- Frank T. Burbrink
- Department of Herpetology, American Museum of Natural History, Central Park West at 79th Street, New York, New York 10024; . Send reprint requests to this address
| | - Sara Ruane
- Earth and Environmental Sciences: Ecology and Evolution, Rutgers University–Newark, 195 University Avenue, Newark, New Jersey 07102
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Huang X, Zhou Y, Zhu H, Wang W, Xiao L, Wang B, Nie J. Genome-wide SNP based species identification of Chinemys reevesii, Ocadia sinensis and their hybrids. GENE REPORTS 2021. [DOI: 10.1016/j.genrep.2021.101249] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Smith CH, Johnson NA, Robertson CR, Doyle RD, Randklev CR. Establishing conservation units to promote recovery of two threatened freshwater mussel species (Bivalvia: Unionida: Potamilus). Ecol Evol 2021; 11:11102-11122. [PMID: 34429906 PMCID: PMC8366875 DOI: 10.1002/ece3.7897] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2020] [Revised: 05/11/2021] [Accepted: 06/28/2021] [Indexed: 11/09/2022] Open
Abstract
Population genomics has significantly increased our ability to make inferences about microevolutionary processes and demographic histories, which have the potential to improve protection and recovery of imperiled species. Freshwater mussels (Bivalvia: Unionida) represent one of the most imperiled groups of organisms globally. Despite systemic decline of mussel abundance and diversity, studies evaluating spatiotemporal changes in distribution, demographic histories, and ecological factors that threaten long-term persistence of imperiled species remain lacking. In this study, we use genotype-by-sequencing (GBS) and mitochondrial sequence data (mtDNA) to define conservation units (CUs) for two highly imperiled freshwater mussel species, Potamilus amphichaenus and Potamilus streckersoni. We then synthesize our molecular findings with details from field collections spanning from 1901 to 2019 to further elucidate distributional trends, contemporary status, and other factors that may be contributing to population declines for our focal species. We collected GBS and mtDNA data for individuals of P. amphichaenus and P. streckersoni from freshwater mussel collections in the Brazos, Neches, Sabine, and Trinity drainages ranging from 2012 to 2019. Molecular analyses resolved disputing number of genetic clusters within P. amphichaenus and P. streckersoni; however, we find defensible support for four CUs, each corresponding to an independent river basin. Evaluations of historical and recent occurrence data illuminated a generally increasing trend of occurrence in each of the four CUs, which were correlated with recent increases in sampling effort. Taken together, these findings suggest that P. amphichaenus and P. streckersoni are likely rare throughout their respective ranges. Because of this, the establishment of CUs will facilitate evidence-based recovery planning and ensure potential captive propagation and translocation efforts are beneficial. Our synthesis represents a case study for conservation genomic assessments in freshwater mussels and provides a model for future studies aimed at recovery planning for these highly imperiled organisms.
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Affiliation(s)
- Chase H. Smith
- Department of Integrative BiologyUniversity of TexasAustinTexasUSA
- Texas A&M Natural Resources Institute, Texas A&M AgriLife Research Center at DallasDallasTexasUSA
- Biology DepartmentBaylor UniversityWacoTexasUSA
| | - Nathan A. Johnson
- U.S. Geological Survey, Wetland and Aquatic Research CenterGainesvilleFloridaUSA
| | | | | | - Charles R. Randklev
- Texas A&M Natural Resources Institute, Texas A&M AgriLife Research Center at DallasDallasTexasUSA
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Genomic Approaches for Conservation Management in Australia under Climate Change. Life (Basel) 2021; 11:life11070653. [PMID: 34357024 PMCID: PMC8304512 DOI: 10.3390/life11070653] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2021] [Revised: 07/02/2021] [Accepted: 07/03/2021] [Indexed: 12/28/2022] Open
Abstract
Conservation genetics has informed threatened species management for several decades. With the advent of advanced DNA sequencing technologies in recent years, it is now possible to monitor and manage threatened populations with even greater precision. Climate change presents a number of threats and challenges, but new genomics data and analytical approaches provide opportunities to identify critical evolutionary processes of relevance to genetic management under climate change. Here, we discuss the applications of such approaches for threatened species management in Australia in the context of climate change, identifying methods of facilitating viability and resilience in the face of extreme environmental stress. Using genomic approaches, conservation management practices such as translocation, targeted gene flow, and gene-editing can now be performed with the express intention of facilitating adaptation to current and projected climate change scenarios in vulnerable species, thus reducing extinction risk and ensuring the protection of our unique biodiversity for future generations. We discuss the current barriers to implementing conservation genomic projects and the efforts being made to overcome them, including communication between researchers and managers to improve the relevance and applicability of genomic studies. We present novel approaches for facilitating adaptive capacity and accelerating natural selection in species to encourage resilience in the face of climate change.
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Fenker J, Tedeschi LG, Melville J, Moritz C. Predictors of phylogeographic structure among codistributed taxa across the complex Australian monsoonal tropics. Mol Ecol 2021; 30:4276-4291. [PMID: 34216506 DOI: 10.1111/mec.16057] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2020] [Revised: 06/16/2021] [Accepted: 06/28/2021] [Indexed: 11/28/2022]
Abstract
Differences in the geographic scale and depth of phylogeographic structure across codistributed taxa can reveal how microevolutionary processes such as population isolation and persistence drive diversification. In turn, environmental heterogeneity, species' traits, and historical biogeographic barriers may influence the potential for isolation and persistence. Using extensive SNP data and a combination of population genetic summary statistics and landscape genomic analyses, we explored predictors of the scale and depth of phylogeographic structure in codistributed lizard taxa from the topographically and climatically complex monsoonal tropics (AMT) of Australia. We first resolved intraspecific lineages and then tested whether genetic divergence across space within lineages is related to isolation by distance, resistance and/or environment and whether these factors differ across genera or between rock-related versus habitat generalist taxa. We then tested whether microevolutionary processes within lineages explain differences in the geographic scale and depth of intraspecific phylogeographic lineages. The results indicated that landscape predictors of phylogeographic structure differ between taxa. Within lineages, there was prevalent isolation by distance, but the strength of isolation by distance is independent of the taxonomic family, habitat specialization, and climate. Isolation by environment is the strongest predictor of landscape-scale genetic divergence for all taxa, with both temperature and precipitation acting as limiting factors. The strength of isolation by distance does not predict the geographic scale of the phylogeographic structure. However, more localized lineages had higher mean individual heterozygosity and less negative Tajima's D. This result implies that finer-scale phylogeographic structuring within species is associated with larger and more stable populations and, hence, persistence.
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Affiliation(s)
- Jessica Fenker
- Division of Ecology & Evolution, Research School of Biology, Australian National University, Canberra, ACT, Australia
| | - Leonardo G Tedeschi
- Division of Ecology & Evolution, Research School of Biology, Australian National University, Canberra, ACT, Australia
| | - Jane Melville
- Department of Sciences, Museums Victoria, Melbourne, VIC, Australia.,School of Biological Sciences, Monash University, Clayton, VIC, Australia
| | - Craig Moritz
- Division of Ecology & Evolution, Research School of Biology, Australian National University, Canberra, ACT, Australia
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Hammer MP, Taillebois L, King AJ, Crook DA, Wedd D, Adams M, Unmack PJ, Hoese DF, Bertozzi T. Unravelling the taxonomy and identification of a problematic group of benthic fishes from tropical rivers (Gobiidae: Glossogobius). JOURNAL OF FISH BIOLOGY 2021; 99:87-100. [PMID: 33583039 DOI: 10.1111/jfb.14701] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/21/2020] [Revised: 02/01/2021] [Accepted: 02/13/2021] [Indexed: 06/12/2023]
Abstract
Flathead gobies (genus Glossogobius) include c. 40 small- to medium-sized benthic fishes found primarily in freshwater habitats across the Indo-Pacific, having biodiversity value as well as cultural and economic value as food fishes, especially in developing countries. To help resolve considerable confusion regarding the identification of some of the larger-growing Glossogobius species, a systematic framework was established using nuclear genetic markers, mitochondrial DNA barcoding and phenotypic evidence for a geographically widespread collection of individuals from the waterways of tropical northern Australia. Species boundaries and distribution patterns were discordant with those previously reported, most notably for the tank goby Glossogobius giuris, which included a cryptic species. Genetic divergence was matched with accompanying unique visual characters that aid field identification. Additional taxonomic complexity was also evident, by comparison with DNA barcodes from international locations, suggesting that the specific names applicable for two of the candidate species in Australia remain unresolved due to confusion surrounding type specimens. Although flathead gobies are assumed to be widespread and common, this study demonstrates that unrealised taxonomic and ecological complexity is evident, and this will influence assessments of tropical biodiversity and species conservation. This study supports the need for taxonomic studies of freshwater fishes to underpin management in areas subject to significant environmental change.
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Affiliation(s)
- Michael P Hammer
- Museum and Art Gallery of the Northern Territory, Darwin, Northern Territory, Australia
| | - Laura Taillebois
- Research Institute for the Environment and Livelihoods, Charles Darwin University, Darwin, Northern Territory, Australia
| | - Alison J King
- Research Institute for the Environment and Livelihoods, Charles Darwin University, Darwin, Northern Territory, Australia
| | - David A Crook
- Research Institute for the Environment and Livelihoods, Charles Darwin University, Darwin, Northern Territory, Australia
| | - Dion Wedd
- Research Institute for the Environment and Livelihoods, Charles Darwin University, Darwin, Northern Territory, Australia
| | - Mark Adams
- School of Biological Sciences, The University of Adelaide, Adelaide, South Australia, Australia
- Evolutionary Biology Unit, South Australian Museum, Adelaide, South Australia, Australia
| | - Peter J Unmack
- Centre of Applied Water Science, Institute for Applied Ecology, University of Canberra, Canberra, Australian Capital Territory, Australia
| | - Doug F Hoese
- Australian Museum, Sydney, New South Wales, Australia
| | - Terry Bertozzi
- School of Biological Sciences, The University of Adelaide, Adelaide, South Australia, Australia
- Evolutionary Biology Unit, South Australian Museum, Adelaide, South Australia, Australia
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Fahmi, Tibbetts IR, Bennett MB, Dudgeon CL. Delimiting cryptic species within the brown-banded bamboo shark, Chiloscyllium punctatum in the Indo-Australian region with mitochondrial DNA and genome-wide SNP approaches. BMC Ecol Evol 2021; 21:121. [PMID: 34134613 PMCID: PMC8207608 DOI: 10.1186/s12862-021-01852-3] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2020] [Accepted: 06/04/2021] [Indexed: 11/26/2022] Open
Abstract
Background Delimiting cryptic species in elasmobranchs is a major challenge in modern taxonomy due the lack of available phenotypic features. Employing stand-alone genetics in splitting a cryptic species may prove problematic for further studies and for implementing conservation management. In this study, we examined mitochondrial DNA and genome-wide nuclear single nucleotide polymorphisms (SNPs) in the brown-banded bambooshark, Chiloscyllium punctatum to evaluate potential cryptic species and the species-population boundary in the group. Results Both mtDNA and SNP analyses showed potential delimitation within C. punctatum from the Indo-Australian region and consisted of four operational taxonomic units (OTUs), i.e. those from Indo-Malay region, the west coast of Sumatra, Lesser Sunda region, and the Australian region. Each OTU can be interpreted differently depending on available supporting information, either based on biological, ecological or geographical data. We found that SNP data provided more robust results than mtDNA data in determining the boundary between population and cryptic species. Conclusion To split a cryptic species complex and erect new species based purely on the results of genetic analyses is not recommended. The designation of new species needs supportive diagnostic morphological characters that allow for species recognition, as an inability to recognise individuals in the field creates difficulties for future research, management for conservation and fisheries purposes. Moreover, we recommend that future studies use a comprehensive sampling regime that encompasses the full range of a species complex. This approach would increase the likelihood of identification of operational taxonomic units rather than resulting in an incorrect designation of new species. Supplementary Information The online version contains supplementary material available at 10.1186/s12862-021-01852-3.
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Affiliation(s)
- Fahmi
- School of Biological Sciences, The University of Queensland, Brisbane, QLD, 4072, Australia. .,Research Center for Oceanography, Indonesian Institute of Sciences, Jalan Pasir Putih I No. 1 Ancol, Jakarta, 14430, Indonesia.
| | - Ian R Tibbetts
- School of Biological Sciences, The University of Queensland, Brisbane, QLD, 4072, Australia
| | - Michael B Bennett
- School of Biomedical Sciences, The University of Queensland, Brisbane, QLD, 4072, Australia
| | - Christine L Dudgeon
- School of Biomedical Sciences, The University of Queensland, Brisbane, QLD, 4072, Australia
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Hoffmann AA, White VL, Jasper M, Yagui H, Sinclair SJ, Kearney MR. An endangered flightless grasshopper with strong genetic structure maintains population genetic variation despite extensive habitat loss. Ecol Evol 2021; 11:5364-5380. [PMID: 34026013 PMCID: PMC8131777 DOI: 10.1002/ece3.7428] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2021] [Revised: 02/18/2021] [Accepted: 02/21/2021] [Indexed: 12/11/2022] Open
Abstract
Conservation research is dominated by vertebrate examples but the shorter generation times and high local population sizes of invertebrates may lead to very different management strategies, particularly for species with low movement rates. Here we investigate the genetic structure of an endangered flightless grasshopper, Keyacris scurra, which was used in classical evolutionary studies in the 1960s. It had a wide distribution across New South Wales (NSW) and Victoria in pre-European times but has now become threatened because of land clearing for agriculture and other activities. We revisited remnant sites of K. scurra, with populations now restricted to only one area in Victoria and a few small patches in NSW and the Australian Capital Territory (ACT). Using DArtseq to generate SNP markers as well as mtDNA sequence data, we show that the remaining Victorian populations in an isolated valley are genetically distinct from the NSW populations and that all populations tend to be genetically unique, with large F ST values up to 0.8 being detected for the SNP datasets. We also find that, with one notable exception, the NSW/ACT populations separate genetically into previously described chromosomal races (2n = 15 vs. 2n = 17). Isolation by distance was detected across both the SNP and mtDNA datasets, and there was substantial differentiation within chromosomal races. Genetic diversity as measured by heterozygosity was not correlated with the size of remaining habitat where the populations were found, with high variation present in some remnant cemetery sites. However, inbreeding correlated negatively with estimated habitat size at 25-500 m patch radius. These findings emphasize the importance of small habitat areas in conserving genetic variation in such species with low mobility, and they highlight populations suitable for future translocation efforts.
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Affiliation(s)
- Ary A. Hoffmann
- Pest and Environmental Adaptation Research GroupBio21 InstituteSchool of BioSciencesThe University of MelbourneParkvilleVictoriaAustralia
| | - Vanessa L. White
- School of BioSciencesThe University of MelbourneMelbourneVictoriaAustralia
| | - Moshe Jasper
- Pest and Environmental Adaptation Research GroupBio21 InstituteSchool of BioSciencesThe University of MelbourneParkvilleVictoriaAustralia
| | - Hiromi Yagui
- Pest and Environmental Adaptation Research GroupBio21 InstituteSchool of BioSciencesThe University of MelbourneParkvilleVictoriaAustralia
| | - Steve J. Sinclair
- Department of Environment, Land, Water and PlanningArthur Rylah InstituteHeidelbergVictoriaAustralia
| | - Michael R. Kearney
- School of BioSciencesThe University of MelbourneMelbourneVictoriaAustralia
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High elevation increases the risk of Y chromosome loss in Alpine skink populations with sex reversal. Heredity (Edinb) 2021; 126:805-816. [PMID: 33526811 PMCID: PMC8102603 DOI: 10.1038/s41437-021-00406-z] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2020] [Revised: 01/07/2021] [Accepted: 01/08/2021] [Indexed: 01/30/2023] Open
Abstract
The view that has genotypic sex determination and environmental sex determination as mutually exclusive states in fishes and reptiles has been contradicted by the discovery that chromosomal sex and environmental influences can co-exist within the same species, hinting at a continuum of intermediate states. Systems where genes and the environment interact to determine sex present the opportunity for sex reversal to occur, where the phenotypic sex is the opposite of that predicted by their sex chromosome complement. The skink Bassiana duperreyi has XX/XY sex chromosomes with sex reversal of the XX genotype to a male phenotype, in laboratory experiments, and in field nests, in response to exposure to cold incubation temperatures. Here we studied the frequency of sex reversal in adult populations of B. duperreyi in response to climatic variation, using elevation as a surrogate for environmental temperatures. We demonstrate sex reversal in the wild for the first time in adults of a reptile species with XX/XY sex determination. The highest frequency of sex reversal occurred at the highest coolest elevation location, Mt Ginini (18.46%) and decreased in frequency to zero with decreasing elevation. We model the impact of this under Fisher's frequency-dependent selection to show that, at the highest elevations, populations risk the loss of the Y chromosome and a transition to temperature-dependent sex determination. This study contributes to our understanding of the risks of extinction from climate change in species subject to sex reversal by temperature, and will provide focus for future research to test on-the-ground management strategies to mitigate the effects of climate in local populations.
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Evolutionary history and genetic connectivity across highly fragmented populations of an endangered daisy. Heredity (Edinb) 2021; 126:846-858. [PMID: 33608651 PMCID: PMC8102499 DOI: 10.1038/s41437-021-00413-0] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2020] [Revised: 01/24/2021] [Accepted: 01/25/2021] [Indexed: 01/31/2023] Open
Abstract
Conservation management can be aided by knowledge of genetic diversity and evolutionary history, so that ecological and evolutionary processes can be preserved. The Button Wrinklewort daisy (Rutidosis leptorrhynchoides) was a common component of grassy ecosystems in south-eastern Australia. It is now endangered due to extensive habitat loss and the impacts of livestock grazing, and is currently restricted to a few small populations in two regions >500 km apart, one in Victoria, the other in the Australian Capital Territory and nearby New South Wales (ACT/NSW). Using a genome-wide SNP dataset, we assessed patterns of genetic structure and genetic differentiation of 12 natural diploid populations. We estimated intrapopulation genetic diversity to scope sources for genetic management. Bayesian clustering and principal coordinate analyses showed strong population genetic differentiation between the two regions, and substantial substructure within ACT/NSW. A coalescent tree-building approach implemented in SNAPP indicated evolutionary divergence between the two distant regions. Among the populations screened, the last two known remaining Victorian populations had the highest genetic diversity, despite having among the lowest recent census sizes. A maximum likelihood population tree method implemented in TreeMix suggested little or no recent gene flow except potentially between very close neighbours. Populations that were more genetically distinctive had lower genetic diversity, suggesting that drift in isolation is likely driving population differentiation though loss of diversity, hence re-establishing gene flow among them is desirable. These results provide background knowledge for evidence-based conservation and support genetic rescue within and between regions to elevate genetic diversity and alleviate inbreeding.
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49
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Marshall TL, Chambers EA, Matz MV, Hillis DM. How mitonuclear discordance and geographic variation have confounded species boundaries in a widely studied snake. Mol Phylogenet Evol 2021; 162:107194. [PMID: 33940060 DOI: 10.1016/j.ympev.2021.107194] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2020] [Revised: 03/12/2021] [Accepted: 04/28/2021] [Indexed: 12/15/2022]
Abstract
As DNA sequencing technologies and methods for delimiting species with genomic data become more accessible and numerous, researchers have more tools than ever to investigate questions in systematics and phylogeography. However, easy access to sophisticated computational tools is not without its drawbacks. Choosing the right approach for one's question can be challenging when presented with multitudinous options, some of which fail to distinguish between species and intraspecific population structure. Here, we employ a methodology that emphasizes intensive geographic sampling, particularly at contact zones between populations, with a focus on differentiating intraspecific genetic clusters from species in the Pantherophis guttatus complex, a group of North American ratsnakes. Using a mitochondrial marker as well as ddRADseq data, we find evidence of mitonuclear discordance which has contributed to historical confusion about the relationships within this group. Additionally, we identify geographically and genetically structured populations within the species Pantherophis emoryi that are congruent with previously described morphological variation. Importantly, we find that these structured populations within P. emoryi are highly admixed throughout the range of the species and show no evidence of any reproductive isolation. Our data support a revision of the taxonomy of this group, and we recognize two species within the complex and three subspecies within P. emoryi. This study illustrates the importance of thorough sampling of contact zones and consideration of gene flow when delimiting species in widespread complexes containing parapatric lineages.
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Affiliation(s)
- Thomas L Marshall
- Department of Integrative Biology and Biodiversity Center, The University of Texas at Austin, Austin, TX 78712, USA.
| | - E Anne Chambers
- Department of Integrative Biology and Biodiversity Center, The University of Texas at Austin, Austin, TX 78712, USA
| | - Mikhail V Matz
- Department of Integrative Biology and Biodiversity Center, The University of Texas at Austin, Austin, TX 78712, USA
| | - David M Hillis
- Department of Integrative Biology and Biodiversity Center, The University of Texas at Austin, Austin, TX 78712, USA
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Esquerré D, Donnellan SC, Pavón-Vázquez CJ, Fenker J, Keogh JS. Phylogeography, historical demography and systematics of the world's smallest pythons (Pythonidae, Antaresia). Mol Phylogenet Evol 2021; 161:107181. [PMID: 33892100 DOI: 10.1016/j.ympev.2021.107181] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2020] [Revised: 04/06/2021] [Accepted: 04/15/2021] [Indexed: 11/18/2022]
Abstract
Advances from empirical studies in phylogeography, systematics and species delimitation highlight the importance of integrative approaches for quantifying taxonomic diversity. Genomic data have greatly improved our ability to discern both systematic diversity and evolutionary history. Here we combine analyses of mitochondrial DNA sequences, thousands of genome-wide SNPs and linear and geometric morphometrics on Antaresia, a clade of four currently recognised dwarf pythons from Australia and New Guinea (Antaresia childreni, A. stimsoni, A. maculosa and A. perthensis). Our integrative analyses of phylogenetics, population structure, species delimitation, historical demography and morphometrics revealed that the true evolutionary diversity is not well reflected in the current appraisal of the diversity of the group. We find that Antaresia childreni and A. stimsoni comprise a widespread network of populations connected by gene flow and without evidence of species-level divergence among them. However, A. maculosa shows considerable genetic structuring which leads us to recognise two subspecies in northeastern Australia and a new species in Torres Strait and New Guinea. These two contrasting cases of over and under estimation of diversity, respectively, illustrate the power of thorough integrative approaches into understanding evolution of biodiversity. Furthermore, our analyses of historical demographic patterns highlight the importance of the Kimberley, Pilbara and Cape York as origins of biodiversity in Australia.
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Affiliation(s)
- Damien Esquerré
- Division of Ecology and Evolution, Research School of Biology, The Australian National University, Canberra, ACT 0200, Australia.
| | | | - Carlos J Pavón-Vázquez
- Division of Ecology and Evolution, Research School of Biology, The Australian National University, Canberra, ACT 0200, Australia
| | - Jéssica Fenker
- Division of Ecology and Evolution, Research School of Biology, The Australian National University, Canberra, ACT 0200, Australia
| | - J Scott Keogh
- Division of Ecology and Evolution, Research School of Biology, The Australian National University, Canberra, ACT 0200, Australia
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