1
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Willis S, Coykendall DK, Campbell MR, Narum S. Contrasting patterns of sequence variation in steelhead populations reflect distinct evolutionary processes. Evol Appl 2024; 17:e13623. [PMID: 38283605 PMCID: PMC10810252 DOI: 10.1111/eva.13623] [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: 09/16/2022] [Revised: 10/24/2023] [Accepted: 11/10/2023] [Indexed: 01/30/2024] Open
Abstract
Multiple evolutionary processes influence genome-wide allele frequencies and quantifying effects of genetic drift, and multiple forms of selection remain challenging in natural populations. Here, we investigate variation at major effect loci in contrast to patterns of neutral drift across a wide collection of steelhead (Oncorhynchus mykiss) populations that have declined in abundance due to anthropogenic impacts. Whole-genome resequencing of 74 populations of steelhead revealed genome-wide patterns (~8 million SNPs) consistent with expected neutral population structure. However, allelic variation at major effect loci associated with adult migration timing (chromosome 28: GREB1L/ROCK1) and age at maturity (chromosome 25: SIX6) reflected how selection has acted on phenotypic variation in contrast with neutral structure. Variation at major effect loci was influenced by evolutionary processes with differing signals between the strongly divergent Coastal and Inland lineages, while allele frequencies within and among populations within the Inland lineage have been driven by local natural selection as well as recent anthropogenic influences. Recent anthropogenic effects appeared to have influenced the frequency of major effect alleles including artificial selection for specific traits in hatchery stocks with subsequent gene flow into natural populations. Selection from environmental factors at various scales has also likely influenced variation for major effect alleles. These results reveal evolutionary mechanisms that influence allele frequencies at major effect loci that are critical for conservation of phenotypic traits and life history variation of this protected species.
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Affiliation(s)
- Stuart Willis
- Hagerman Genetics LabColumbia River Inter‐Tribal Fish CommissionHagermanIdahoUSA
| | | | | | - Shawn Narum
- Hagerman Genetics LabColumbia River Inter‐Tribal Fish CommissionHagermanIdahoUSA
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2
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Hoelzel AR. Where to now with the evolutionarily significant unit? Trends Ecol Evol 2023; 38:1134-1142. [PMID: 37596130 DOI: 10.1016/j.tree.2023.07.005] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2023] [Revised: 07/17/2023] [Accepted: 07/21/2023] [Indexed: 08/20/2023]
Abstract
The designation of units for conservation has been a necessary but challenging objective since conservation efforts began. Most species are divided, typically by environment, into populations with independent evolutionary trajectories. There are practical conservation objectives for defining these boundaries. Separate genetic clusters provide future evolutionary potential as environments change, and individuals in isolated populations may lose fitness when population size is reduced. The history of the effort to define units is briefly reviewed here, but I focus on finding a process that may facilitate uniform and effective application at a time when conservation urgency is great. I propose a refinement of the designated unit concept, distinguishing between conservation units (CUs) and evolutionarily sustaining conservation units (ESCUs).
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Affiliation(s)
- A Rus Hoelzel
- Department of Biosciences, Durham University, South Road, Durham, DH1 3LE, UK.
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3
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Awad MF, Albogami B, Mwabvu T, Hassan MM, Baazeem A, Hassan MM, Elsharkawy MM. Identification and biodiversity patterns of Aspergillus species isolated from some soil invertebrates at high altitude using morphological characteristics and phylogenetic analyses. PeerJ 2023; 11:e15035. [PMID: 37033730 PMCID: PMC10075209 DOI: 10.7717/peerj.15035] [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: 01/17/2023] [Accepted: 02/20/2023] [Indexed: 03/30/2023] Open
Abstract
Background
The carcinogenic, mutagenic, and teratogenic chemicals such as aflatoxin are a worldwide health problem. Aspergillus spp., responsible for most cases of aflatoxin contamination, are common in the environment and spread easily to many different types of food. The objectives of this study were to conduct a survey of fungi associated with three soil invertebrates in Taif, Saudi Arabia, identify these isolates and explore mycotoxins formation.
Methods
In total, 114 fungal isolates were collected from various soil invertebrates (millipedes, Armadillidium vulgare and Porcellio laevis) in Taif, Saudi Arabia, among them, 22 isolates were identified as Aspergillus spp. based on morphological and molecular characteristics followed by both Fusarium and Penicillium.
Results
The sequences of ITS 1 and ITS 4 were utilized. Using bootstrap analysis, phylogenetic tree was split into two distinct clusters. Five sub clusters were included inside the first major cluster, and their bootstrap value was 99%. While, there were two small clusters in the second major cluster. All the tested Aspergillus strains were able to have a single PCR fragment amplified using the primer AspTef. TEF-1 DNA sequence bootstrap analysis with 1,000 replicates revealed two distinct groups. Additionally, the Aspergillus isolates were grouped into two different clusters with about 65% genetic similarity using ISSR-PCR analysis. The standard polymerase chain reaction was used to effectively amplify the Aopks, afl-A and omt-A genes in aflatoxigenic Aspergillus strains. Four Aspergillus strains used in this investigation were shown to generate aflatoxin B1. While, three Aspergillus stains showed ochratoxin genes.
Conclusions
In conclusion, the results indicate significant differences in the fungal community between ecoregions and soil invertebrates. Moreover, mycotoxin detection and identification among Aspergillus isolates were elucidated. This study could shed light on the risk of mycotoxin contamination along the supply chain.
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Affiliation(s)
- Mohamed Fadl Awad
- Department of Biology, College of Science, Taif University, Taif, Saudi Arabia
- High Altitude Research Centre, Taif University, Taif, Saudi Arabia
| | - Bander Albogami
- Department of Biology, College of Science, Taif University, Taif, Saudi Arabia
- High Altitude Research Centre, Taif University, Taif, Saudi Arabia
| | - Tarombera Mwabvu
- School of Biology & Environmental Sciences, University of Mpumalanga, Mbombela, South Africa
| | - Montaser M. Hassan
- Department of Biology, College of Science, Taif University, Taif, Saudi Arabia
- High Altitude Research Centre, Taif University, Taif, Saudi Arabia
| | - Alaa Baazeem
- Department of Biology, College of Science, Taif University, Taif, Saudi Arabia
- High Altitude Research Centre, Taif University, Taif, Saudi Arabia
| | - Mohamed M. Hassan
- Department of Biology, College of Science, Taif University, Taif, Saudi Arabia
- High Altitude Research Centre, Taif University, Taif, Saudi Arabia
| | - Mohsen Mohamed Elsharkawy
- Department of Agricultural Botany, Faculty of Agriculture, Kafrelsheikh University, Kafr Elsheikh, Egypt
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4
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Hendricks SA, King JL, Duncan CL, Vickers W, Hohenlohe PA, Davis BW. Genomic Assessment of Cancer Susceptibility in the Threatened Catalina Island Fox ( Urocyon littoralis catalinae). Genes (Basel) 2022; 13:1496. [PMID: 36011407 PMCID: PMC9408614 DOI: 10.3390/genes13081496] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2022] [Revised: 08/12/2022] [Accepted: 08/12/2022] [Indexed: 12/12/2022] Open
Abstract
Small effective population sizes raise the probability of extinction by increasing the frequency of potentially deleterious alleles and reducing fitness. However, the extent to which cancers play a role in the fitness reduction of genetically depauperate wildlife populations is unknown. Santa Catalina island foxes (Urocyon littoralis catalinae) sampled in 2007-2008 have a high prevalence of ceruminous gland tumors, which was not detected in the population prior to a recent bottleneck caused by a canine distemper epidemic. The disease appears to be associated with inflammation from chronic ear mite (Otodectes) infections and secondary elevated levels of Staphyloccus pseudointermedius bacterial infections. However, no other environmental factors to date have been found to be associated with elevated cancer risk in this population. Here, we used whole genome sequencing of the case and control individuals from two islands to identify candidate loci associated with cancer based on genetic divergence, nucleotide diversity, allele frequency spectrum, and runs of homozygosity. We identified several candidate loci based on genomic signatures and putative gene functions, suggesting that cancer susceptibility in this population may be polygenic. Due to the efforts of a recovery program and weak fitness effects of late-onset disease, the population size has increased, which may allow selection to be more effective in removing these presumably slightly deleterious alleles. Long-term monitoring of the disease alleles, as well as overall genetic diversity, will provide crucial information for the long-term persistence of this threatened population.
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Affiliation(s)
- Sarah A. Hendricks
- Institute for Interdisciplinary Data Sciences, University of Idaho, Moscow, ID 83844, USA
| | - Julie L. King
- Catalina Island Conservancy, P.O. Box 2739, Avalon, CA 90704, USA
| | - Calvin L. Duncan
- Catalina Island Conservancy, P.O. Box 2739, Avalon, CA 90704, USA
| | - Winston Vickers
- Institute for Wildlife Studies, Arcata, CA 95521, USA
- Karen C. Drayer Wildlife Health Center, School of Veterinary Medicine, University of California, Davis, CA 95616, USA
| | - Paul A. Hohenlohe
- Institute for Interdisciplinary Data Sciences, University of Idaho, Moscow, ID 83844, USA
- Department of Biological Sciences, University of Idaho, Moscow, ID 83844, USA
| | - Brian W. Davis
- Department of Veterinary Integrative Biosciences, College of Veterinary Medicine and Biomedical Science, Texas A&M University, College Station, TX 77840, USA
- Department of Small Animal Clinical Sciences, College of Veterinary Medicine and Biomedical Science, Texas A&M University, College Station, TX 77840, USA
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5
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Genomics of Adaptation and Speciation. Genes (Basel) 2022; 13:genes13071187. [PMID: 35885970 PMCID: PMC9321343 DOI: 10.3390/genes13071187] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2022] [Accepted: 05/18/2022] [Indexed: 02/01/2023] Open
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6
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Buzan E, Potušek S, Duniš L, Pokorny B. Neutral and Selective Processes Shape MHC Diversity in Roe Deer in Slovenia. Animals (Basel) 2022; 12:ani12060723. [PMID: 35327121 PMCID: PMC8944837 DOI: 10.3390/ani12060723] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2021] [Revised: 02/23/2022] [Accepted: 03/10/2022] [Indexed: 12/21/2022] Open
Abstract
Simple Summary Disease prevention and appropriate wildlife management are among the major challenges in wildlife conservation. In the present study, we made a first assessment of the variability of major histocompatibility complex (MHC) genes in roe deer in Slovenia and evaluated local population adaptation by comparing MHC variability with neutral microsatellites. We discovered three new MHC DRB exon 2 alleles in addition to seven previously described in the literature. Moreover, we found evidence of historical positive selection, as selection analysis indicated that approx. 10% of the encoded amino acids were subjected to episodic positive selection. This study provides the basis for further research on immunogenetic variation in roe deer and highlights opportunities to incorporate genetic data into science-based population management. Abstract Disease control and containment in free-ranging populations is one of the greatest challenges in wildlife management. Despite the importance of major histocompatibility complex (MHC) genes for immune response, an assessment of the diversity and occurrence of these genes is still rare in European roe deer, the most abundant and widespread large mammal in Europe. Therefore, we examined immunogenetic variation in roe deer in Slovenia to identify species adaptation by comparing the genetic diversity of the MHC genes with the data on neutral microsatellites. We found ten MHC DRB alleles, three of which are novel. Evidence for historical positive selection on the MHC was found using the maximum likelihood codon method. Patterns of MHC allelic distribution were not congruent with neutral population genetic findings. The lack of population genetic differentiation in MHC genes compared to existing structure in neutral markers suggests that MHC polymorphism was influenced primarily by balancing selection and, to a lesser extent, by neutral processes such as genetic drift, with no clear evidence of local adaptation. Selection analyses indicated that approx. 10% of amino acids encoded under episodic positive selection. This study represents one of the first steps towards establishing an immunogenetic map of roe deer populations across Europe, aiming to better support science-based management of this important game species.
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Affiliation(s)
- Elena Buzan
- Faculty of Mathematics, Natural Sciences, and Information Technologies, University of Primorska, Glagoljaška 8, 6000 Koper, Slovenia; (S.P.); (L.D.)
- Environmental Protection College, Trg Mladosti 7, 3320 Velenje, Slovenia;
- Correspondence: ; Tel.: +38-65-6117570; Fax: +38-65-61175
| | - Sandra Potušek
- Faculty of Mathematics, Natural Sciences, and Information Technologies, University of Primorska, Glagoljaška 8, 6000 Koper, Slovenia; (S.P.); (L.D.)
| | - Luka Duniš
- Faculty of Mathematics, Natural Sciences, and Information Technologies, University of Primorska, Glagoljaška 8, 6000 Koper, Slovenia; (S.P.); (L.D.)
| | - Boštjan Pokorny
- Environmental Protection College, Trg Mladosti 7, 3320 Velenje, Slovenia;
- Slovenian Forestry Institute, Večna pot 2, 1000 Ljubljana, Slovenia
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7
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Pratt EAL, Beheregaray LB, Bilgmann K, Zanardo N, Diaz-Aguirre F, Brauer C, Sandoval-Castillo J, Möller LM. Seascape genomics of coastal bottlenose dolphins along strong gradients of temperature and salinity. Mol Ecol 2022; 31:2223-2241. [PMID: 35146819 DOI: 10.1111/mec.16389] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2021] [Revised: 02/01/2022] [Accepted: 02/03/2022] [Indexed: 11/30/2022]
Abstract
Heterogeneous seascapes and strong environmental gradients in coastal waters are expected to influence adaptive divergence, particularly in species with large population sizes where selection is expected to be highly efficient. However, these influences might also extend to species characterized by strong social structure, natal philopatry and small home ranges. We implemented a seascape genomic study to test this hypothesis in Indo-Pacific bottlenose dolphins (Tursiops aduncus) distributed along the environmentally heterogeneous coast of southern Australia. The datasets included oceanographic and environmental variables thought to be good predictors of local adaptation in dolphins and 8,081 filtered single nucleotide polymorphisms (SNPs) genotyped for individuals sampled from seven different bioregions. From a neutral perspective, population structure and connectivity of the dolphins were generally influenced by habitat type and social structuring. Genotype-environment association analysis identified 241 candidate adaptive loci and revealed that sea surface temperature and salinity gradients influenced adaptive divergence in these animals at both large- (1,000s km) and fine-scales (<100 km). Enrichment analysis and annotation of candidate genes revealed functions related to sodium-activated ion transport, kidney development, adipogenesis and thermogenesis. The findings of spatial adaptive divergence and inferences of putative physiological adaptations challenge previous suggestions that marine megafauna is most likely to be affected by environmental and climatic changes via indirect, trophic effects. Our work contributes to conservation management of coastal bottlenose dolphins subjected to anthropogenic disturbance and to efforts of clarifying how seascape heterogeneity influences adaptive diversity and evolution in small cetaceans.
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Affiliation(s)
- Eleanor A L Pratt
- Molecular Ecology Laboratory, College of Science and Engineering, Flinders University, Bedford Park, 5042, South Australia, Australia.,Cetacean Ecology, Behaviour and Evolution Laboratory, College of Science and Engineering, Flinders University, Bedford Park, 5042, South Australia, Australia
| | - Luciano B Beheregaray
- Molecular Ecology Laboratory, College of Science and Engineering, Flinders University, Bedford Park, 5042, South Australia, Australia
| | - Kerstin Bilgmann
- Department of Biological Sciences, Macquarie University, 2109, New South Wales, Australia
| | - Nikki Zanardo
- Molecular Ecology Laboratory, College of Science and Engineering, Flinders University, Bedford Park, 5042, South Australia, Australia.,Cetacean Ecology, Behaviour and Evolution Laboratory, College of Science and Engineering, Flinders University, Bedford Park, 5042, South Australia, Australia.,Department of Environment and Water, Adelaide, 5000, South Australia, Australia
| | - Fernando Diaz-Aguirre
- Molecular Ecology Laboratory, College of Science and Engineering, Flinders University, Bedford Park, 5042, South Australia, Australia.,Cetacean Ecology, Behaviour and Evolution Laboratory, College of Science and Engineering, Flinders University, Bedford Park, 5042, South Australia, Australia
| | - Chris Brauer
- Molecular Ecology Laboratory, College of Science and Engineering, Flinders University, Bedford Park, 5042, South Australia, Australia
| | - Jonathan Sandoval-Castillo
- Molecular Ecology Laboratory, College of Science and Engineering, Flinders University, Bedford Park, 5042, South Australia, Australia
| | - Luciana M Möller
- Molecular Ecology Laboratory, College of Science and Engineering, Flinders University, Bedford Park, 5042, South Australia, Australia.,Cetacean Ecology, Behaviour and Evolution Laboratory, College of Science and Engineering, Flinders University, Bedford Park, 5042, South Australia, Australia
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8
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Giska I, Pimenta J, Farelo L, Boursot P, Hackländer K, Jenny H, Reid N, Montgomery WI, Prodöhl PA, Alves PC, Melo-Ferreira J. The evolutionary pathways for local adaptation in mountain hares. Mol Ecol 2022; 31:1487-1503. [PMID: 34995383 PMCID: PMC9303332 DOI: 10.1111/mec.16338] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2021] [Revised: 12/06/2021] [Accepted: 12/17/2021] [Indexed: 12/13/2022]
Abstract
Understanding the evolution of local adaptations is a central aim of evolutionary biology and key for the identification of unique populations and lineages of conservation relevance. By combining RAD sequencing and whole‐genome sequencing, we identify genetic signatures of local adaptation in mountain hares (Lepus timidus) from isolated and distinctive habitats of its wide distribution: Ireland, the Alps and Fennoscandia. Demographic modelling suggested that the split of these mountain hares occurred around 20 thousand years ago, providing the opportunity to study adaptive evolution over a short timescale. Using genome‐wide scans, we identified signatures of extreme differentiation among hares from distinct geographic areas that overlap with area‐specific selective sweeps, suggesting targets for local adaptation. Several identified candidate genes are associated with traits related to the uniqueness of the different environments inhabited by the three groups of mountain hares, including coat colour, ability to live at high altitudes and variation in body size. In Irish mountain hares, a variant of ASIP, a gene previously implicated in introgression‐driven winter coat colour variation in mountain and snowshoe hares (L. americanus), may underlie brown winter coats, reinforcing the repeated nature of evolution at ASIP moulding adaptive seasonal colouration. Comparative genomic analyses across several hare species suggested that mountain hares’ adaptive variants appear predominantly species‐specific. However, using coalescent simulations, we also show instances where the candidate adaptive variants have been introduced via introgressive hybridization. Our study shows that standing adaptive variation, including that introgressed from other species, was a crucial component of the post‐glacial dynamics of species.
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Affiliation(s)
- Iwona Giska
- CIBIO, Centro de Investigação em Biodiversidade e Recursos Genéticos, InBIO Laboratório Associado, Universidade do Porto, Vairão, Portugal
| | - João Pimenta
- CIBIO, Centro de Investigação em Biodiversidade e Recursos Genéticos, InBIO Laboratório Associado, Universidade do Porto, Vairão, Portugal.,Departamento de Biologia, Faculdade de Ciências da Universidade do Porto, Porto, Portugal.,BIOPOLIS Program in Genomics, Biodiversity and Land Planning, CIBIO, Vairão, Portugal
| | - Liliana Farelo
- CIBIO, Centro de Investigação em Biodiversidade e Recursos Genéticos, InBIO Laboratório Associado, Universidade do Porto, Vairão, Portugal.,BIOPOLIS Program in Genomics, Biodiversity and Land Planning, CIBIO, Vairão, Portugal
| | - Pierre Boursot
- Institut des Sciences de l'Évolution Montpellier (ISEM), Université Montpellier, CNRS, IRD, Montpellier, France
| | - Klaus Hackländer
- Institute of Wildlife Biology and Game Management, University of Natural Resources and Life Sciences, Vienna, Austria.,Deutsche Wildtier Stiftung (German Wildlife Foundation), Hamburg, Germany
| | - Hannes Jenny
- Department of Wildlife and Fishery Service Grison, Chur, Switzerland
| | - Neil Reid
- Institute of Global Food Security (IGFS), School of Biological Sciences, Queen's University Belfast, Belfast, UK
| | - W Ian Montgomery
- Institute of Global Food Security (IGFS), School of Biological Sciences, Queen's University Belfast, Belfast, UK
| | - Paulo A Prodöhl
- Institute of Global Food Security (IGFS), School of Biological Sciences, Queen's University Belfast, Belfast, UK
| | - Paulo C Alves
- CIBIO, Centro de Investigação em Biodiversidade e Recursos Genéticos, InBIO Laboratório Associado, Universidade do Porto, Vairão, Portugal.,Departamento de Biologia, Faculdade de Ciências da Universidade do Porto, Porto, Portugal.,BIOPOLIS Program in Genomics, Biodiversity and Land Planning, CIBIO, Vairão, Portugal
| | - José Melo-Ferreira
- CIBIO, Centro de Investigação em Biodiversidade e Recursos Genéticos, InBIO Laboratório Associado, Universidade do Porto, Vairão, Portugal.,Departamento de Biologia, Faculdade de Ciências da Universidade do Porto, Porto, Portugal.,BIOPOLIS Program in Genomics, Biodiversity and Land Planning, CIBIO, Vairão, Portugal
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9
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Brüniche-Olsen A, Kellner KF, Belant JL, DeWoody JA. Life-history traits and habitat availability shape genomic diversity in birds: implications for conservation. Proc Biol Sci 2021; 288:20211441. [PMID: 34702080 PMCID: PMC8548786 DOI: 10.1098/rspb.2021.1441] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2021] [Accepted: 10/06/2021] [Indexed: 12/15/2022] Open
Abstract
More than 25% of species assessed by the International Union for Conservation of Nature (IUCN) are threatened with extinction. Understanding how environmental and biological processes have shaped genomic diversity may inform management practices. Using 68 extant avian species, we parsed the effects of habitat availability and life-history traits on genomic diversity over time to provide a baseline for conservation efforts. We used published whole-genome sequence data to estimate overall genomic diversity as indicated by historical long-term effective population sizes (Ne) and current genomic variability (H), then used environmental niche modelling to estimate Pleistocene habitat dynamics for each species. We found that Ne and H were positively correlated with habitat availability and related to key life-history traits (body mass and diet), suggesting the latter contribute to the overall genomic variation. We found that H decreased with increasing species extinction risk, suggesting that H may serve as a leading indicator of demographic trends related to formal IUCN conservation status in birds. Our analyses illustrate that genome-wide summary statistics estimated from sequence data reflect meaningful ecological attributes relevant to species conservation.
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Affiliation(s)
- Anna Brüniche-Olsen
- Section for Computational and RNA Biology, Department of Biology, University of Copenhagen, 2200 KBH N Copenhagen, Denmark
| | - Kenneth F. Kellner
- Global Wildlife Conservation Center, State University of New York College of Environmental Science and Forestry, Syracuse, NY 13210, USA
| | - Jerrold L. Belant
- Global Wildlife Conservation Center, State University of New York College of Environmental Science and Forestry, Syracuse, NY 13210, USA
| | - J. Andrew DeWoody
- Department of Forestry and Natural Resources, Purdue University, West Lafayette, IN 47905, USA
- Department of Biological Sciences, Purdue University, West Lafayette, IN 47905, USA
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10
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Galla SJ, Brown L, Couch-Lewis Ngāi Tahu Te Hapū O Ngāti Wheke Ngāti Waewae Y, Cubrinovska I, Eason D, Gooley RM, Hamilton JA, Heath JA, Hauser SS, Latch EK, Matocq MD, Richardson A, Wold JR, Hogg CJ, Santure AW, Steeves TE. The relevance of pedigrees in the conservation genomics era. Mol Ecol 2021; 31:41-54. [PMID: 34553796 PMCID: PMC9298073 DOI: 10.1111/mec.16192] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2021] [Revised: 09/12/2021] [Accepted: 09/17/2021] [Indexed: 01/21/2023]
Abstract
Over the past 50 years conservation genetics has developed a substantive toolbox to inform species management. One of the most long‐standing tools available to manage genetics—the pedigree—has been widely used to characterize diversity and maximize evolutionary potential in threatened populations. Now, with the ability to use high throughput sequencing to estimate relatedness, inbreeding, and genome‐wide functional diversity, some have asked whether it is warranted for conservation biologists to continue collecting and collating pedigrees for species management. In this perspective, we argue that pedigrees remain a relevant tool, and when combined with genomic data, create an invaluable resource for conservation genomic management. Genomic data can address pedigree pitfalls (e.g., founder relatedness, missing data, uncertainty), and in return robust pedigrees allow for more nuanced research design, including well‐informed sampling strategies and quantitative analyses (e.g., heritability, linkage) to better inform genomic inquiry. We further contend that building and maintaining pedigrees provides an opportunity to strengthen trusted relationships among conservation researchers, practitioners, Indigenous Peoples, and Local Communities.
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Affiliation(s)
- Stephanie J Galla
- Department of Biological Sciences, Boise State University, Boise, Idaho, USA.,School of Biological Sciences, University of Canterbury, Christchurch, Canterbury, New Zealand
| | - Liz Brown
- New Zealand Department of Conservation, Twizel, Canterbury, New Zealand
| | | | - Ilina Cubrinovska
- School of Biological Sciences, University of Canterbury, Christchurch, Canterbury, New Zealand
| | - Daryl Eason
- New Zealand Department of Conservation, Invercargill, Southland, New Zealand
| | - Rebecca M Gooley
- Smithsonian-Mason School of Conservation, Front Royal, Maryland, USA.,Center for Species Survival, Smithsonian Conservation Biology Institute, National Zoological Park, Washington, District of Columbia, USA
| | - Jill A Hamilton
- Department of Biological Sciences, North Dakota State University, Fargo, North Dakota, USA
| | - Julie A Heath
- Department of Biological Sciences, Boise State University, Boise, Idaho, USA
| | - Samantha S Hauser
- Department of Biological Sciences, University of Wisconsin-Milwaukee, Milwaukee, Wisconsin, USA
| | - Emily K Latch
- Department of Biological Sciences, University of Wisconsin-Milwaukee, Milwaukee, Wisconsin, USA
| | - Marjorie D Matocq
- Department of Natural Resources and Environmental Science, Program in Ecology, Evolution and Conservation Biology, University of Nevada Reno, Reno, Nevada, USA
| | - Anne Richardson
- The Isaac Conservation and Wildlife Trust, Christchurch, Canterbury, New Zealand
| | - Jana R Wold
- School of Biological Sciences, University of Canterbury, Christchurch, Canterbury, New Zealand
| | - Carolyn J Hogg
- School of Life and Environmental Sciences, University of Sydney, Sydney, NSW, Australia
| | - Anna W Santure
- School of Biological Sciences, University of Auckland, Auckland, Auckland, New Zealand
| | - Tammy E Steeves
- School of Biological Sciences, University of Canterbury, Christchurch, Canterbury, New Zealand
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11
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Kloch A, Biedrzycka A, Szewczyk M, Nowak S, Niedźwiedzka N, Kłodawska M, Hájková A, Hulva P, Jędrzejewska B, Mysłajek R. High genetic diversity of immunity genes in an expanding population of a highly mobile carnivore, the grey wolf
Canis
lupus
, in Central Europe. DIVERS DISTRIB 2021. [DOI: 10.1111/ddi.13360] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
Affiliation(s)
- Agnieszka Kloch
- Department of Ecology, Institute of Functional Biology and Ecology, Faculty of Biology, Biological and Chemical Research Centre University of Warsaw Warszawa Poland
| | | | - Maciej Szewczyk
- Department of Vertebrate Ecology and Zoology Faculty of Biology University of Gdańsk Gdańsk Poland
| | - Sabina Nowak
- Association for Nature “Wolf” Twardorzeczka Poland
| | | | - Monika Kłodawska
- Department of Zoology Faculty of Science Charles University Prague Czech Republic
| | - Andrea Hájková
- State Nature Conservancy of the Slovak Republic Spišská Nová Ves Slovakia
| | - Pavel Hulva
- Department of Zoology Faculty of Science Charles University Prague Czech Republic
- Department of Biology and Ecology Faculty of Science University of Ostrava Ostrava Czech Republic
| | | | - Robert Mysłajek
- Department of Ecology, Institute of Functional Biology and Ecology, Faculty of Biology, Biological and Chemical Research Centre University of Warsaw Warszawa Poland
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12
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Jones SK, Estrada-Carmona N, Juventia SD, Dulloo ME, Laporte MA, Villani C, Remans R. Agrobiodiversity Index scores show agrobiodiversity is underutilized in national food systems. NATURE FOOD 2021; 2:712-723. [PMID: 37117466 DOI: 10.1038/s43016-021-00344-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/15/2020] [Accepted: 07/14/2021] [Indexed: 04/30/2023]
Abstract
The diversity of plants, animals and microorganisms that directly or indirectly support food and agriculture is critical to achieving healthy diets and agroecosystems. Here we present the Agrobiodiversity Index (based on 22 indicators), which provides a monitoring framework and informs food systems policy. Agrobiodiversity Index calculations for 80 countries reveal a moderate mean agrobiodiversity status score (56.0 out of 100), a moderate mean agrobiodiversity action score (47.8 out of 100) and a low mean agrobiodiversity commitment score (21.4 out of 100), indicating that much stronger commitments and concrete actions are needed to enhance agrobiodiversity across the food system. Mean agrobiodiversity status scores in consumption and conservation are 14-82% higher in developed countries than in developing countries, while scores in production are consistently low across least developed, developing and developed countries. We also found an absence of globally consistent data for several important components of agrobiodiversity, including varietal, functional and underutilized species diversity.
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Affiliation(s)
| | | | - Stella D Juventia
- Bioversity International, Montpellier, France
- Farming Systems Ecology Group, Wageningen University & Research, Wageningen, The Netherlands
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13
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Willis SC, Hess JE, Fryer JK, Whiteaker JM, Narum SR. Genomic region associated with run timing has similar haplotypes and phenotypic effects across three lineages of Chinook salmon. Evol Appl 2021; 14:2273-2285. [PMID: 34603498 PMCID: PMC8477596 DOI: 10.1111/eva.13290] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2021] [Revised: 08/04/2021] [Accepted: 08/05/2021] [Indexed: 12/16/2022] Open
Abstract
Conserving life-history variation is a stated goal of many management programs, but the most effective means by which to accomplish this are often far from clear. Early- and late-migrating forms of Chinook salmon (Oncorhynchus tshawytscha) face unequal pressure from natural and anthropogenic forces that may alter the impacts of genetic variation underlying heritable migration timing. Genomic regions of chromosome 28 are known to be strongly associated with migration variation in adult Chinook salmon, but it remains unclear whether there is consistent association among diverse lineages and populations in large basins such as the Columbia River. With high-throughput genotyping (GT-seq) and phenotyping methods, we examined the association of genetic variation in 28 markers (spanning GREB1L to ROCK1 of chromosome 28) with individual adult migration timing characteristics gleaned from passive integrated transponder recordings of over 5000 Chinook salmon from the three major phylogeographic lineages that inhabit the Columbia River Basin. Despite the strong genetic differences among them in putatively neutral genomic regions, each of the three lineages exhibited very similar genetic variants in the chromosome 28 region that were significantly associated with adult migration timing phenotypes. This is particularly notable for the interior stream-type lineage, which exhibits an earlier and more constrained freshwater entry than the other lineages. In both interior stream-type and interior ocean-type lineages of Chinook salmon, heterozygotes of the most strongly associated linkage groups had largely intermediate migration timing relative to homozygotes, and results indicate codominance or possibly marginal partial dominance of the allele associated with early migration. Our results lend support to utilization of chromosome 28 variation in tracking and predicting run timing in these lineages of Chinook salmon in the Columbia River.
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Affiliation(s)
- Stuart C. Willis
- Hagerman Genetics LaboratoryColumbia River Inter‐Tribal Fish CommissionHagermanIDUSA
| | - Jon E. Hess
- Hagerman Genetics LaboratoryColumbia River Inter‐Tribal Fish CommissionHagermanIDUSA
| | - Jeff K. Fryer
- Fishery Science DepartmentColumbia River Inter‐Tribal Fish CommissionPortlandORUSA
| | - John M. Whiteaker
- Fishery Science DepartmentColumbia River Inter‐Tribal Fish CommissionPortlandORUSA
| | - Shawn R. Narum
- Hagerman Genetics LaboratoryColumbia River Inter‐Tribal Fish CommissionHagermanIDUSA
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14
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Chromosome-Level Genome Assemblies Expand Capabilities of Genomics for Conservation Biology. Genes (Basel) 2021; 12:genes12091336. [PMID: 34573318 PMCID: PMC8466942 DOI: 10.3390/genes12091336] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2021] [Revised: 08/20/2021] [Accepted: 08/25/2021] [Indexed: 11/26/2022] Open
Abstract
Genome assemblies are in the process of becoming an increasingly important tool for understanding genetic diversity in threatened species. Unfortunately, due to limited budgets typical for the area of conservation biology, genome assemblies of threatened species, when available, tend to be highly fragmented, represented by tens of thousands of scaffolds not assigned to chromosomal locations. The recent advent of high-throughput chromosome conformation capture (Hi-C) enables more contiguous assemblies containing scaffolds spanning the length of entire chromosomes for little additional cost. These inexpensive contiguous assemblies can be generated using Hi-C scaffolding of existing short-read draft assemblies, where N50 of the draft contigs is larger than 0.1% of the estimated genome size and can greatly improve analyses and facilitate visualization of genome-wide features including distribution of genetic diversity in markers along chromosomes or chromosome-length scaffolds. We compared distribution of genetic diversity along chromosomes of eight mammalian species, including six listed as threatened by IUCN, where both draft genome assemblies and newer chromosome-level assemblies were available. The chromosome-level assemblies showed marked improvement in localization and visualization of genetic diversity, especially where the distribution of low heterozygosity across the genomes of threatened species was not uniform.
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15
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Extensive standing genetic variation from a small number of founders enables rapid adaptation in Daphnia. Nat Commun 2021; 12:4306. [PMID: 34262034 PMCID: PMC8280168 DOI: 10.1038/s41467-021-24581-z] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2020] [Accepted: 06/24/2021] [Indexed: 02/06/2023] Open
Abstract
We lack a thorough understanding of the origin and maintenance of standing genetic variation that enables rapid evolutionary responses of natural populations. Whole genome sequencing of a resurrected Daphnia population shows that standing genetic variation in over 500 genes follows an evolutionary trajectory that parallels the pronounced and rapid adaptive evolution of multiple traits in response to predator-driven natural selection and its subsequent relaxation. Genetic variation carried by only five founding individuals from the regional genotype pool is shown to suffice at enabling the observed evolution. Our results provide insight on how natural populations can acquire the genomic variation, through colonization by a few regional genotypes, that fuels rapid evolution in response to strong selection pressures. While these evolutionary responses in our study population involved hundreds of genes, we observed no evidence of genetic erosion.
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16
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Seaborn T, Andrews KR, Applestein CV, Breech TM, Garrett MJ, Zaiats A, Caughlin TT. Integrating genomics in population models to forecast translocation success. Restor Ecol 2021. [DOI: 10.1111/rec.13395] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Travis Seaborn
- Department of Fish and Wildlife Sciences University of Idaho Moscow ID U.S.A
| | - Kimberly R. Andrews
- Institute for Bioinformatics and Evolutionary Studies (IBEST) University of Idaho Moscow ID U.S.A
| | | | - Tyler M. Breech
- Department of Biological Sciences Idaho State University Pocatello ID U.S.A
| | - Molly J. Garrett
- Department of Fish and Wildlife Sciences University of Idaho Moscow ID U.S.A
| | - Andrii Zaiats
- Biological Sciences Boise State University Boise ID U.S.A
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17
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Andrews KR, Epstein B, Leslie MS, Fiedler P, Morin PA, Hoelzel AR. Genomic signatures of divergent selection are associated with social behaviour for spinner dolphin ecotypes. Mol Ecol 2021; 30:1993-2008. [PMID: 33645853 DOI: 10.1111/mec.15865] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2020] [Revised: 01/16/2021] [Accepted: 02/22/2021] [Indexed: 12/17/2022]
Abstract
Understanding the genomic basis of adaptation is critical for understanding evolutionary processes and predicting how species will respond to environmental change. Spinner dolphins in the eastern tropical Pacific (ETP) present a unique system for studying adaptation. Within this large geographical region are four spinner dolphin ecotypes with weak neutral genetic divergence and no obvious barriers to gene flow, but strong spatial variation in morphology, behaviour and habitat. These ecotypes have large population sizes, which could reduce the effects of drift and facilitate selection. To identify genomic regions putatively under divergent selective pressures between ecotypes, we used genome scans with 8994 RADseq single nucleotide polymorphisms (SNPs) to identify population differentiation outliers and genotype-environment association outliers. Gene ontology enrichment analyses indicated that outlier SNPs from both types of analyses were associated with multiple genes involved in social behaviour and hippocampus development, including 15 genes associated with the human social disorder autism. Evidence for divergent selection on social behaviour is supported by previous evidence that these spinner dolphin ecotypes differ in mating systems and associated social behaviours. In particular, three of the ETP ecotypes probably have a polygynous mating system characterized by strong premating competition among males, whereas the fourth ecotype probably has a polygynandrous mating system characterized by strong postmating competition such as sperm competition. Our results provide evidence that selection for social behaviour may be an evolutionary force driving diversification of spinner dolphins in the ETP, potentially as a result of divergent sexual selection associated with different mating systems. Future studies should further investigate the potential adaptive role of the candidate genes identified here, and could probably find further signatures of selection using whole genome sequence data.
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Affiliation(s)
- Kimberly R Andrews
- School of Biosciences, Durham University, Durham, UK.,Institute for Bioinformatics and Evolutionary Studies (IBEST), University of Idaho, Moscow, ID, USA
| | - Brendan Epstein
- Department of Plant & Microbial Biology, University of Minnesota, St. Paul, MN, USA
| | | | - Paul Fiedler
- Southwest Fisheries Science Center, National Marine Fisheries Service, NOAA, La Jolla, CA, USA
| | - Phillip A Morin
- Southwest Fisheries Science Center, National Marine Fisheries Service, NOAA, La Jolla, CA, USA
| | - A Rus Hoelzel
- School of Biosciences, Durham University, Durham, UK
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18
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Teixeira JC, Huber CD. The inflated significance of neutral genetic diversity in conservation genetics. Proc Natl Acad Sci U S A 2021; 118:e2015096118. [PMID: 33608481 PMCID: PMC7958437 DOI: 10.1073/pnas.2015096118] [Citation(s) in RCA: 135] [Impact Index Per Article: 45.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
Abstract
The current rate of species extinction is rapidly approaching unprecedented highs, and life on Earth presently faces a sixth mass extinction event driven by anthropogenic activity, climate change, and ecological collapse. The field of conservation genetics aims at preserving species by using their levels of genetic diversity, usually measured as neutral genome-wide diversity, as a barometer for evaluating population health and extinction risk. A fundamental assumption is that higher levels of genetic diversity lead to an increase in fitness and long-term survival of a species. Here, we argue against the perceived importance of neutral genetic diversity for the conservation of wild populations and species. We demonstrate that no simple general relationship exists between neutral genetic diversity and the risk of species extinction. Instead, a better understanding of the properties of functional genetic diversity, demographic history, and ecological relationships is necessary for developing and implementing effective conservation genetic strategies.
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Affiliation(s)
- João C Teixeira
- School of Biological Sciences, The University of Adelaide, Adelaide, 5005 SA, Australia;
- Australian Research Council Centre of Excellence for Australian Biodiversity and Heritage, The University of Adelaide, Adelaide, 5005 SA, Australia
| | - Christian D Huber
- School of Biological Sciences, The University of Adelaide, Adelaide, 5005 SA, Australia;
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19
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Abstract
Background and aims Wildlife conservation has focused primarily on species for the last decades. Recently, popular perception and laws have begun to recognize the central importance of genetic diversity in the conservation of biodiversity. How to incorporate genetic diversity in ongoing monitoring and management of wildlife is still an open question. Methods We tested a panel of multiplexed, high-throughput sequenced introns in the small mammal communities of two UNESCO World Heritage Sites on different continents to assess their viability for large-scale monitoring of genetic variability in a spectrum of diverse species. To enhance applicability across other systems, the bioinformatic pipeline for primer design was outlined. Results The number of loci amplified and amplification evenness decreased as phylogenetic distance increased from the reference taxa, yet several loci were still variable across multiple mammal orders. Conclusions Genetic variability found is informative for population genetic analyses and for addressing phylogeographic and phylogenetic questions, illustrated by small mammal examples here.
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20
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Willis SC, Hess JE, Fryer JK, Whiteaker JM, Brun C, Gerstenberger R, Narum SR. Steelhead ( Oncorhynchus mykiss) lineages and sexes show variable patterns of association of adult migration timing and age-at-maturity traits with two genomic regions. Evol Appl 2020; 13:2836-2856. [PMID: 33294026 PMCID: PMC7691471 DOI: 10.1111/eva.13088] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2020] [Revised: 07/30/2020] [Accepted: 07/31/2020] [Indexed: 12/15/2022] Open
Abstract
As life history diversity plays a critical role in supporting the resilience of exploited populations, understanding the genetic basis of those life history variations is important for conservation management. However, effective application requires a robust understanding of the strength and universality of genetic associations. Here, we examine genetic variation of single nucleotide polymorphisms in genomic regions previously associated with migration phenology and age-at-maturity in steelhead (Oncorhynchus mykiss) from the Columbia River. We found chromosome 28 markers (GREB1L, ROCK1 genes) explained significant variance in migration timing in both coastal and inland steelhead. However, strength of association was much greater in coastal than inland steelhead (R 2 0.51 vs. 0.08), suggesting that genomic background and challenging inland migration pathways may act to moderate effects of this region. Further, we found that chromosome 25 candidate markers (SIX6 gene) were significantly associated with age and size at first return migration for inland steelhead, and this pattern was mediated by sex in a predictable pattern (males R 2 = 0.139-0.170; females R 2 = 0.096-0.111). While this encourages using these candidate regions in predicting life history characteristics, we suggest that stock-specific associations and haplotype frequencies will be useful in guiding implementation of genetic assays to inform management.
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Affiliation(s)
- Stuart C. Willis
- Hagerman Genetics LaboratoryColumbia River Inter‐Tribal Fish CommissionHagermanIDUSA
| | - Jon E. Hess
- Hagerman Genetics LaboratoryColumbia River Inter‐Tribal Fish CommissionHagermanIDUSA
| | - Jeff K. Fryer
- Fishery Science DepartmentColumbia River Inter‐Tribal Fish CommissionPortlandORUSA
| | - John M. Whiteaker
- Fishery Science DepartmentColumbia River Inter‐Tribal Fish CommissionPortlandORUSA
| | - Chris Brun
- Branch of Natural Resources – Fisheries, Confederated Tribes of Warm SpringsPortlandORUSA
| | - Ryan Gerstenberger
- Branch of Natural Resources – Fisheries, Confederated Tribes of Warm SpringsPortlandORUSA
| | - Shawn R. Narum
- Hagerman Genetics LaboratoryColumbia River Inter‐Tribal Fish CommissionHagermanIDUSA
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21
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Ochoa A, Broe M, Moriarty Lemmon E, Lemmon AR, Rokyta DR, Gibbs HL. Drift, selection and adaptive variation in small populations of a threatened rattlesnake. Mol Ecol 2020; 29:2612-2625. [PMID: 32557885 DOI: 10.1111/mec.15517] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2019] [Revised: 05/09/2020] [Accepted: 05/21/2020] [Indexed: 01/22/2023]
Abstract
An important goal of conservation genetics is to determine if the viability of small populations is reduced by a loss of adaptive variation due to genetic drift. Here, we assessed the impact of drift and selection on direct measures of adaptive variation (toxin loci encoding venom proteins) in the eastern massasauga rattlesnake (Sistrurus catenatus), a threatened reptile that exists in small isolated populations. We estimated levels of individual polymorphism in 46 toxin loci and 1,467 control loci across 12 populations of this species, and compared the results with patterns of selection on the same loci following speciation of S. catenatus and its closest relative, the western massasauga (S. tergeminus). Multiple lines of evidence suggest that both drift and selection have had observable impacts on standing adaptive variation. In support of drift effects, we found little evidence for selection on toxin variation within populations and a significant positive relationship between current levels of adaptive variation and long- and short-term estimates of effective population size. However, we also observed levels of directional selection on toxin loci among populations that are broadly similar to patterns predicted from interspecific selection analyses that pre-date the effects of recent drift, and that functional variation in these loci persists despite small short-term effective sizes. This suggests that much of the adaptive variation present in populations may represent an example of "drift debt," a nonequilibrium state where present-day levels of variation overestimate the amount of functional genetic diversity present in future populations.
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Affiliation(s)
- Alexander Ochoa
- Ohio Biodiversity Conservation Partnership and Department of Evolution, Ecology, and Organismal Biology, Ohio State University, Columbus, OH, USA
| | - Michael Broe
- Ohio Biodiversity Conservation Partnership and Department of Evolution, Ecology, and Organismal Biology, Ohio State University, Columbus, OH, USA
| | | | - Alan R Lemmon
- Department of Scientific Computing, Florida State University, Tallahassee, FL, USA
| | - Darin R Rokyta
- Department of Biological Science, Florida State University, Tallahassee, FL, USA
| | - H Lisle Gibbs
- Ohio Biodiversity Conservation Partnership and Department of Evolution, Ecology, and Organismal Biology, Ohio State University, Columbus, OH, USA
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22
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Kanfany G, Serba DD, Rhodes D, St Amand P, Bernardo A, Gangashetty PI, Kane NA, Bai G. Genomic diversity in pearl millet inbred lines derived from landraces and improved varieties. BMC Genomics 2020; 21:469. [PMID: 32641069 PMCID: PMC7341570 DOI: 10.1186/s12864-020-06796-4] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2020] [Accepted: 05/26/2020] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Genetic improvement of pearl millet is lagging behind most of the major crops. Development of genomic resources is expected to expedite breeding for improved agronomic traits, stress tolerance, yield, and nutritional quality. Genotyping a breeding population with high throughput markers enables exploration of genetic diversity, population structure, and linkage disequilibrium (LD) which are important preludes for marker-trait association studies and application of genomic-assisted breeding. RESULTS Genotyping-by-sequencing (GBS) libraries of 309 inbred lines derived from landraces and improved varieties from Africa and India generated 54,770 high quality single nucleotide polymorphism (SNP) markers. On average one SNP per 29 Kb was mapped in the reference genome, with the telomeric regions more densely mapped than the pericentromeric regions of the chromosomes. Population structure analysis using 30,208 SNPs evenly distributed in the genome divided 309 accessions into five subpopulations with different levels of admixture. Pairwise genetic distance (GD) between accessions varied from 0.09 to 0.33 with the average distance of 0.28. Rapid LD decay implied low tendency of markers inherited together. Genetic differentiation estimates were the highest between subgroups 4 and 5, and the lowest between subgroups 1 and 2. CONCLUSIONS Population genomic analysis of pearl millet inbred lines derived from diverse geographic and agroecological features identified five subgroups mostly following pedigree differences with different levels of admixture. It also revealed the prevalence of high genetic diversity in pearl millet, which is very useful in defining heterotic groups for hybrid breeding, trait mapping, and holds promise for improving pearl millet for yield and nutritional quality. The short LD decay observed suggests an absence of persistent haplotype blocks in pearl millet. The diverse genetic background of these lines and their low LD make this set of germplasm useful for traits mapping.
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Affiliation(s)
- Ghislain Kanfany
- Institut Sénégalais de Recherches Agricoles (ISRA), Centre National de Recherches Agronomiques de Bambey, Diourbel, Senegal
| | - Desalegn D Serba
- Agricultural Research Center-Hays, Kansas State University, 1232 240th Avenue, Hays, KS, 67601, USA.
| | - Davina Rhodes
- Department of Agronomy, Kansas State University, Manhattan, KS, USA
| | - Paul St Amand
- Hard Winter Wheat Genetics Research Unit, USDA-ARS, Manhattan, KS, USA
| | - Amy Bernardo
- Hard Winter Wheat Genetics Research Unit, USDA-ARS, Manhattan, KS, USA
| | - Prakash I Gangashetty
- International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Niamey, Niger
| | - Ndjido Ardo Kane
- Institut Sénégalais de Recherches Agricoles/Centre d'Étude Régional pour l'Amélioration de l'Adaptation à la Sécheresse (ISRA/CERAAS), Thiès, Senegal
| | - Guihua Bai
- Hard Winter Wheat Genetics Research Unit, USDA-ARS, Manhattan, KS, USA
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23
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Milot E, Béchet A, Maris V. The dimensions of evolutionary potential in biological conservation. Evol Appl 2020; 13:1363-1379. [PMID: 32684964 PMCID: PMC7359841 DOI: 10.1111/eva.12995] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2019] [Revised: 04/13/2020] [Accepted: 04/17/2020] [Indexed: 01/05/2023] Open
Abstract
It is now well admitted by ecologists that the conservation of biodiversity should imply preserving the evolutionary processes that will permit its adaptation to ongoing and future environmental changes. This is attested by the ever-growing reference to the conservation of evolutionary potential in the scientific literature. The impression that one may have when reading papers is that conserving evolutionary potential can only be a good thing, whatever biological system is under scrutiny. However, different objectives, such as maintaining species richness versus ecosystem services, may express different, when not conflicting, underlying values attributed to biodiversity. For instance, biodiversity can be intrinsically valued, as worth it to be conserved per se, or it can be conserved as a means for human flourishing. Consequently, both the concept of evolutionary potential and the prescriptions derived from the commitment to conserve it remain problematic, due to a lack of explicit mention of the norms underlying different conservation visions. Here, we contend that those who advocate for the conservation of evolutionary potential should position their conception along four dimensions: what vehicles instantiate the evolutionary potential relevant to their normative commitment; what temporality is involved; how measurable evolutionary potential is, and what degree of human influence is tolerated. We need to address these dimensions if we are to determine why and when the maintenance of evolutionary potential is an appropriate target for the conservation of biodiversity.
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Affiliation(s)
- Emmanuel Milot
- Department of Chemistry, Biochemistry and Physics Université du Québec à Trois-Rivières Trois-Rivières Québec Canada
| | - Arnaud Béchet
- Tour du Valat Research Institute for the Conservation of Mediterranean Wetlands Arles France
| | - Virginie Maris
- Centre d'écologie fonctionnelle et évolutive, CNRS, EPHE, IRD Univ Montpellier Univ Paul Valéry Montpellier 3 Montpellier France
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24
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de Jong MJ, Li Z, Qin Y, Quéméré E, Baker K, Wang W, Hoelzel AR. Demography and adaptation promoting evolutionary transitions in a mammalian genus that diversified during the Pleistocene. Mol Ecol 2020; 29:2777-2792. [PMID: 32306438 DOI: 10.1111/mec.15450] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2019] [Revised: 02/25/2020] [Accepted: 04/03/2020] [Indexed: 01/13/2023]
Abstract
Species that evolved in temperate regions during the Pleistocene experienced periods of extreme climatic transitions. Consequent population fragmentation and dynamics had the potential to generate small, isolated populations where the influence of genetic drift would be expected to be strong. We use comparative genomics to assess the evolutionary influence of historical demographics and natural selection through a series of transitions associated with the formation of the genus Capreolus, speciation within this genus during the Quaternary and during divergence among European roe deer (C. capreolus) populations. Our analyses were facilitated by the generation of a new high-coverage reference genome for the Siberian roe deer (C. pygargus). We find progressive reductions in effective population size (Ne ), despite very large census sizes in modern C. capreolus populations and show that low Ne has impacted the C. capreolus genome, reducing diversity and increasing linkage disequilibrium. Even so, we find evidence for natural selection shared among C. capreolus populations, including a historically documented founder population that has been through a severe bottleneck. During each phylogenetic transition there is evidence for selection (from dN/dS and nucleotide diversity tests), including at loci associated with diapause (delayed embryonic development), a phenotype restricted to this genus among the even-toed ungulates. Together these data allow us to assess expectations for the origin and diversification of a mammalian genus during a period of extreme environmental change.
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Affiliation(s)
- Menno J de Jong
- Molecular Ecology Group, Department of Biosciences, Durham University, Durham, UK
| | - Zhipeng Li
- Department of Special Animal nutrition and Feed Science, Institute of Special Animal and Plant Sciences, Chinese Academy of Agricultural Sciences, Changchun City, China
| | - Yanli Qin
- Center for Ecological and Environmental Sciences, Northwestern Polytechnical University, Xi'an, China
| | - Erwan Quéméré
- Comportement et Ecologie de la Faune Sauvage (CEFS), INRA, Université de Toulouse, Castanet-Tolosan, France.,Ecology and Ecosystems Health, Ouest, INRAE, Rennes, France
| | - Karis Baker
- Molecular Ecology Group, Department of Biosciences, Durham University, Durham, UK
| | - Wen Wang
- Center for Ecological and Environmental Sciences, Northwestern Polytechnical University, Xi'an, China
| | - A Rus Hoelzel
- Molecular Ecology Group, Department of Biosciences, Durham University, Durham, UK
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25
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Nevill PG, Robinson TP, Di Virgilio G, Wardell‐Johnson G. Beyond isolation by distance: What best explains functional connectivity among populations of three sympatric plant species in an ancient terrestrial island system? DIVERS DISTRIB 2019. [DOI: 10.1111/ddi.12959] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023] Open
Affiliation(s)
- Paul Gerard Nevill
- ARC Centre for Mine Site Restoration, School of Molecular and Life Sciences Curtin University Perth Western Australia Australia
| | - Todd P. Robinson
- School of Earth and Planetary Sciences Curtin University Perth Western Australia Australia
| | - Giovanni Di Virgilio
- Climate Change Research Centre, School of Biological, Earth and Environmental Sciences University of New South Wales Sydney New South Wales Australia
| | - Grant Wardell‐Johnson
- ARC Centre for Mine Site Restoration, School of Molecular and Life Sciences Curtin University Perth Western Australia Australia
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