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Boughman JW, Brand JA, Brooks RC, Bonduriansky R, Wong BBM. Sexual selection and speciation in the Anthropocene. Trends Ecol Evol 2024; 39:654-665. [PMID: 38503640 DOI: 10.1016/j.tree.2024.02.005] [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: 07/31/2023] [Revised: 02/08/2024] [Accepted: 02/15/2024] [Indexed: 03/21/2024]
Abstract
Anthropogenic change threatens global biodiversity by causing severe ecological disturbance and extinction. Here, we consider the effects of anthropogenic change on one process that generates biodiversity. Sexual selection (a potent evolutionary force and driver of speciation) is highly sensitive to the environment and, thus, vulnerable to anthropogenic ecological change. Anthropogenic alterations to sexual display and mate preference can make it harder to distinguish between conspecific and heterospecific mates or can weaken divergence via sexual selection, leading to higher rates of hybridization and biodiversity loss. Occasionally, anthropogenically altered sexual selection can abet diversification, but this appears less likely than biodiversity loss. In our rapidly changing world, a full understanding of sexual selection and speciation requires a global change perspective.
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Affiliation(s)
- Janette W Boughman
- Department of Integrative Biology & Evolution, Ecology and Behavior Program, Michigan State University, East Lansing, MI 48824, USA.
| | - Jack A Brand
- School of Biological Sciences, Monash University, Melbourne, Victoria 3800, Australia; Department of Wildlife, Fish, and Environmental Studies, Swedish University of Agricultural Sciences, Umeå, Västerbotten, SE-907 36, Sweden
| | - Robert C Brooks
- Evolution & Ecology Research Centre and School of Biological, Earth and Environmental Sciences, University of New South Wales, Sydney, NSW 2052, Australia
| | - Russell Bonduriansky
- Evolution & Ecology Research Centre and School of Biological, Earth and Environmental Sciences, University of New South Wales, Sydney, NSW 2052, Australia
| | - Bob B M Wong
- School of Biological Sciences, Monash University, Melbourne, Victoria 3800, Australia
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Friedrich J, Bailey RI, Talenti A, Chaudhry U, Ali Q, Obishakin EF, Ezeasor C, Powell J, Hanotte O, Tijjani A, Marshall K, Prendergast J, Wiener P. Mapping restricted introgression across the genomes of admixed indigenous African cattle breeds. Genet Sel Evol 2023; 55:91. [PMID: 38097935 PMCID: PMC10722721 DOI: 10.1186/s12711-023-00861-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2023] [Accepted: 11/24/2023] [Indexed: 12/17/2023] Open
Abstract
BACKGROUND The genomes of indigenous African cattle are composed of components with Middle Eastern (taurine) and South Asian (indicine) origins, providing a valuable model to study hybridization and to identify genetic barriers to gene flow. In this study, we analysed indigenous African cattle breeds as models of hybrid zones, considering taurine and indicine samples as ancestors. In a genomic cline analysis of whole-genome sequence data, we considered over 8 million variants from 144 animals, which allows for fine-mapping of potential genomic incompatibilities at high resolution across the genome. RESULTS We identified several thousand variants that had significantly steep clines ('SCV') across the whole genome, indicating restricted introgression. Some of the SCV were clustered into extended regions, with the longest on chromosome 7, spanning 725 kb and including 27 genes. We found that variants with a high phenotypic impact (e.g. indels, intra-genic and missense variants) likely represent greater genetic barriers to gene flow. Furthermore, our findings provide evidence that a large proportion of breed differentiation in African cattle could be linked to genomic incompatibilities and reproductive isolation. Functional evaluation of genes with SCV suggest that mitonuclear incompatibilities and genes associated with fitness (e.g. resistance to paratuberculosis) could account for restricted gene flow in indigenous African cattle. CONCLUSIONS To our knowledge, this is the first time genomic cline analysis has been applied to identify restricted introgression in the genomes of indigenous African cattle and the results provide extended insights into mechanisms (e.g. genomic incompatibilities) contributing to hybrid differentiation. These results have important implications for our understanding of genetic incompatibilities and reproductive isolation and provide important insights into the impact of cross-breeding cattle with the aim of producing offspring that are both hardy and productive.
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Affiliation(s)
- Juliane Friedrich
- Division of Genetics and Genomics, The Roslin Institute and Royal (Dick), School of Veterinary Studies, University of Edinburgh, Midlothian, UK.
| | - Richard I Bailey
- Department of Ecology and Vertebrate Zoology, University of Łódź, Łódź, Poland
| | - Andrea Talenti
- Division of Genetics and Genomics, The Roslin Institute and Royal (Dick), School of Veterinary Studies, University of Edinburgh, Midlothian, UK
| | - Umer Chaudhry
- School of Veterinary Medicine, St. George's University, St. George's, Caribbean, Grenada
| | - Qasim Ali
- Department of Parasitology, The University of Agriculture Dera Ismail Khan, Khyber Pakhtunkhwa, Pakistan
| | - Emmanuel F Obishakin
- Biotechnology Division, National Veterinary Research Institute, Vom, Plateau State, Nigeria
| | - Chukwunonso Ezeasor
- Department of Veterinary Pathology and Microbiology, University of Nigeria, Nsukka, Enugu State, Nigeria
| | - Jessica Powell
- Division of Infection and Immunity, The Roslin Institute and Royal (Dick), School of Veterinary Studies, University of Edinburgh, Midlothian, UK
| | - Olivier Hanotte
- International Livestock Research Institute (ILRI), Addis Ababa, Ethiopia
- School of Life Sciences, University of Nottingham, Nottingham, UK
- Centre for Tropical Livestock Genetics and Health (CTLGH), The Roslin Institute, University of Edinburgh, Midlothian, UK
| | | | - Karen Marshall
- Centre for Tropical Livestock Genetics and Health (CTLGH), ILRI Kenya, Nairobi, Kenya
| | - James Prendergast
- Division of Genetics and Genomics, The Roslin Institute and Royal (Dick), School of Veterinary Studies, University of Edinburgh, Midlothian, UK
| | - Pamela Wiener
- Division of Genetics and Genomics, The Roslin Institute and Royal (Dick), School of Veterinary Studies, University of Edinburgh, Midlothian, UK.
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Grabenstein KC, Otter KA, Burg TM, Taylor SA. Hybridization between closely related songbirds is related to human habitat disturbance. GLOBAL CHANGE BIOLOGY 2023; 29:955-968. [PMID: 36305309 DOI: 10.1111/gcb.16476] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/12/2022] [Revised: 09/14/2022] [Accepted: 09/19/2022] [Indexed: 06/16/2023]
Abstract
Human habitat disturbances can promote hybridization between closely related, but typically reproductively isolated, species. We explored whether human habitat disturbances are related to hybridization between two closely related songbirds, black-capped and mountain chickadees, using both genomic and citizen science data sets. First, we genotyped 409 individuals from across both species' ranges using reduced-representation genome sequencing and compared measures of genetic admixture to a composite measure of human landscape disturbance. Then, using eBird observations, we compared human landscape disturbance values for sites where phenotypically diagnosed hybrids were observed to locations where either parental species was observed to determine whether hybrid chickadees are reported in more disturbed areas. We found that hybridization between black-capped and mountain chickadees positively correlates with human habitat disturbances. From genomic data, we found that (1) hybrid index (HI) significantly increased with habitat disturbance, (2) more hybrids were sampled in disturbed habitats, (3) mean HIs were higher in disturbed habitats versus wild habitats, and (4) hybrids were detected in habitats with significantly higher disturbance values than parentals. Using eBird data, we found that both hybrid and black-capped chickadees were significantly more disturbance-associated than mountain chickadees. Surprisingly, we found that nearly every black-capped chickadee we sampled contained some proportion of hybrid ancestry, while we detected very few mountain chickadee backcrosses. Our results highlight that hybridization between black-capped and mountain chickadees is widespread, but initial hybridization is rare (few F1s were detected). We conclude that human habitat disturbances can erode pre-zygotic reproductive barriers between chickadees and that post-zygotic isolation is incomplete. Understanding what becomes of recently hybridizing species following large-scale habitat disturbances is a new, but pressing, consideration for successfully preserving genetic biodiversity in a rapidly changing world.
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Affiliation(s)
- Kathryn C Grabenstein
- Department of Ecology and Evolutionary Biology, University of Colorado Boulder, Boulder, Colorado, USA
| | - Ken A Otter
- Natural Resources and Environmental Studies, University of Northern British Columbia, Prince George, British Columbia, Canada
| | - Theresa M Burg
- Department of Biological Sciences, University of Lethbridge, Lethbridge, Alberta, Canada
| | - Scott A Taylor
- Department of Ecology and Evolutionary Biology, University of Colorado Boulder, Boulder, Colorado, USA
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Kenyon HL, Martin PR. Experimental test of selection against hybridization as a driver of avian signal divergence. J Evol Biol 2022; 35:1087-1098. [PMID: 35830488 DOI: 10.1111/jeb.14058] [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: 10/17/2021] [Revised: 05/20/2022] [Accepted: 06/07/2022] [Indexed: 11/28/2022]
Abstract
Signal divergence may be pivotal in the generation and maintenance of new biodiversity by allowing closely related species to avoid some costs of co-occurrence. In birds, closely related, sympatric species are more divergent in their colour patterns than those that live apart, but the selective pressures driving this pattern remain unclear. Traditionally, signal divergence among sympatric species is thought to result from selection against hybridization, but broad evidence is lacking. Here, we conducted field experiments on naïve birds using spectrometer-matched, painted 3D-printed models to test whether selection against hybridization drives colour pattern divergence in the genus Poecile. To address selection for male colour pattern divergence without the influence of learning or the evolution of female discrimination in sympatry, we simulated secondary contact between Poecile species, and conducted mate choice experiments on naïve, allopatric females. We found that female black-capped chickadees (Poecile atricapillus) are equally likely to perform copulation solicitation displays to sympatric and allopatric heterospecific congeners when they are paired with conspecifics, but exhibit a strong preference for less divergent males when presented with paired heterospecific congeners. These results suggest that increased colour pattern divergence among sympatric species can reduce the likelihood of mixed mating in some contexts, and therefore should be favoured by selection against hybridization.
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Affiliation(s)
- Haley L Kenyon
- Department of Biology, Queen's University, Kingston, Ontario, Canada
| | - Paul R Martin
- Department of Biology, Queen's University, Kingston, Ontario, Canada
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