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Zhang Y, Stern AJ, Nielsen R. The evolutionary dynamics of local adaptations under genetic rescue is determined by mutational load and polygenicity. J Hered 2024; 115:373-384. [PMID: 38146994 PMCID: PMC11235128 DOI: 10.1093/jhered/esad079] [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: 06/27/2023] [Revised: 11/27/2023] [Accepted: 12/22/2023] [Indexed: 12/27/2023] Open
Abstract
Inbred populations often suffer from increased mutational load and reduced fitness due to lower efficacy of purifying selection in groups with small effective population sizes. Genetic rescue (GR) is a conservation tool that is studied and deployed with the aim of increasing the fitness of such inbred populations by assisted migration of individuals from closely related outbred populations. The success of GR depends on several factors-such as their demographic history and distribution of dominance effects of mutations-that may vary across populations. While we understand the impact of these factors on the dynamics of GR, their impact on local adaptations remains unclear. To this end, we conduct a population genetics simulation study to evaluate the impact of trait complexity (Mendelian vs. polygenic), dominance effects, and demographic history on the efficacy of GR. We find that the impact on local adaptations depends highly on the mutational load at the time of GR, which is in turn shaped dynamically by interactions between demographic history and dominance effects of deleterious variation. Over time local adaptations are generally restored post-GR, though in the short term they are often compromised in the process of purging deleterious variation. We also show that while local adaptations are almost always fully restored, the degree to which ancestral genetic variation affecting the trait is replaced by donor variation can vary drastically and is especially high for complex traits. Our results provide insights on the impact of GR on trait evolution and considerations for the practical implementation of GR.
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Affiliation(s)
- Yulin Zhang
- School of Life Sciences, Sun Yat-sen University, Guangzhou, Guangdong, P.R. China
- Center for Computational Biology, UC Berkeley, Berkeley, CA, United States
| | - Aaron J Stern
- Center for Computational Biology, UC Berkeley, Berkeley, CA, United States
| | - Rasmus Nielsen
- Department of Integrative Biology, UC Berkeley, Berkeley, CA, United States
- Department of Statistics, UC Berkeley, Berkeley, CA, United States
- Center for GeoGenetics, Globe Institute, University of Copenhagen, Copenhagen, Denmark
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Burton RS. The role of mitonuclear incompatibilities in allopatric speciation. Cell Mol Life Sci 2022; 79:103. [PMID: 35091831 PMCID: PMC11072163 DOI: 10.1007/s00018-021-04059-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2021] [Revised: 11/19/2021] [Accepted: 11/25/2021] [Indexed: 11/03/2022]
Abstract
Aerobic metabolism in eukaryotic cells requires extensive interactions between products of the nuclear and mitochondrial genomes. Rapid evolution of the mitochondrial genome, including fixation of both adaptive and deleterious mutations, creates intrinsic selection pressures favoring nuclear gene mutations that maintain mitochondrial function. As this process occurs independently in allopatry, the resulting divergence between conspecific populations can subsequently be manifest in mitonuclear incompatibilities in inter-population hybrids. Such incompatibilities, mitonuclear versions of Bateson-Dobzhansky-Muller incompatibilities that form the standard model for allopatric speciation, can potentially restrict gene flow between populations, ultimately resulting in varying degrees of reproductive isolation. The potential role of mitonuclear incompatibilities in speciation is further enhanced where mtDNA substitution rates are elevated compared to the nuclear genome and where population structure maintains allopatry for adequate time to evolve multiple mitonuclear incompatibilities. However, the fact that mitochondrial introgression occurs across species boundaries has raised questions regarding the efficacy of mitonuclear incompatibilities in reducing gene flow. Several scenarios now appear to satisfactorily explain this phenomenon, including cases where differences in mtDNA genetic load may drive introgression or where co-introgression of coadapted nuclear genes may support the function of introgressed mtDNA. Although asymmetries in reproductive isolation between taxa are consistent with mitonuclear incompatibilities, interactions between autosomes and sex chromosomes yield similar predictions that are difficult to disentangle. With regard to establishing reproductive isolation while in allopatry, existing studies clearly suggest that mitonuclear incompatibilities can contribute to the evolution of barriers to gene flow. However, there is to date relatively little definitive evidence supporting a primary role for mitonuclear incompatibilities in the speciation process.
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Affiliation(s)
- Ronald S Burton
- Marine Biology Research Division, Scripps Institution of Oceanography, University of California San Diego, La Jolla, CA, 92093-0202, USA.
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3
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Kerk M, Onorato DP, Hostetler JA, Bolker BM, Oli MK. Dynamics, Persistence, and Genetic Management of the Endangered Florida Panther Population. WILDLIFE MONOGRAPHS 2019. [DOI: 10.1002/wmon.1041] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Madelon Kerk
- Department of Wildlife Ecology and Conservation University of Florida 110 Newins‐Ziegler Hall Gainesville FL 32611‐0430 USA
| | - David P. Onorato
- Fish and Wildlife Research Institute Florida Fish and Wildlife Conservation Commission 298 Sabal Palm Road Naples FL 34114 USA
| | - Jeffrey A. Hostetler
- Fish and Wildlife Research Institute Florida Fish and Wildlife Conservation Commission 100 8th Avenue SE St. Petersburg FL 33701 USA
| | - Benjamin M. Bolker
- Departments of Mathematics and Statistics and Biology McMaster University 314 Hamilton Hall Hamilton ON L8S 4K1 Canada
| | - Madan K. Oli
- Department of Wildlife Ecology and Conservation University of Florida 110 Newins‐Ziegler Hall Gainesville FL 32611‐0430 USA
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Chan WY, Peplow LM, van Oppen MJH. Interspecific gamete compatibility and hybrid larval fitness in reef-building corals: Implications for coral reef restoration. Sci Rep 2019; 9:4757. [PMID: 30894593 PMCID: PMC6426996 DOI: 10.1038/s41598-019-41190-5] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2017] [Accepted: 02/28/2019] [Indexed: 11/27/2022] Open
Abstract
Climate warming is a major cause of the global decline of coral reefs. Active reef restoration, although still in its infancy, is one of several possible ways to help restore coral cover and reef ecosystem function. The deployment of mature coral larvae onto depauperate reef substratum has been shown to significantly increase larval recruitment, providing a novel option for the delivery of ex situ bred coral stock to the reef for restoration purposes. The success of such reef restoration approaches may be improved by the use of coral larval stock augmented for climate resilience. Here we explore whether coral climate resilience can be enhanced via interspecific hybridization through hybrid vigour. Firstly, we assessed cross-fertility of four pairs of Acropora species from the Great Barrier Reef. Temporal isolation in gamete release between the Acropora species was limited, but gametic incompatibility was present with varying strength between species pairs and depending on the direction of the hybrid crosses. We subsequently examined the fitness of hybrid and purebred larvae under heat stress by comparing their survival and settlement success throughout 10 days of exposure to 28 °C, 29.5 °C and 31 °C. Fitness of the majority of Acropora hybrid larvae was similar to that of the purebred larvae of both parental species, and in some instances it was higher than that of the purebred larvae of one of the parental species. Lower hybrid fertilization success did not affect larval fitness. These findings indicate that high hybrid fitness can be achieved after overcoming partial prezygotic barriers, and that interspecific hybridization may be a tool to enhance coral recruitment and climate resilience.
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Affiliation(s)
- Wing Yan Chan
- Australian Institute of Marine Science, Townsville MC, QLD, 4810, Australia.
- School of BioSciences, University of Melbourne, VIC, 3010, Australia.
| | - Lesa M Peplow
- Australian Institute of Marine Science, Townsville MC, QLD, 4810, Australia
| | - Madeleine J H van Oppen
- Australian Institute of Marine Science, Townsville MC, QLD, 4810, Australia
- School of BioSciences, University of Melbourne, VIC, 3010, Australia
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Karanovic T, Lee S, Lee W. Instant taxonomy: choosing adequate characters for species delimitation and description through congruence between molecular data and quantitative shape analysis. INVERTEBR SYST 2018. [DOI: 10.1071/is17002] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
The lack of university funding is one of the major impediments to taxonomy, partly because traditional taxonomic training takes longer than a PhD course. Understanding ranges of phenotypic variability for different morphological structures, and their use as characters for delimitation and description of taxa, is a tedious task. We argue that the advent of molecular barcoding and quantitative shape analysis makes it unnecessary. As an example, we tackle a problematic species-complex of marine copepods from Korea and Japan, approaching it as a starting taxonomist might. Samples were collected from 14 locations and the mitochondrial COI gene was sequenced from 42 specimens. Our phylogenetic analyses reveal four distinct clades in Korea and Japan, and an additional nine belonging to a closely related complex from other parts of the Northern Pacific. Twenty different morphological structures were analysed for one Japanese and two Korean clades using landmark-based two-dimensional geometric morphometrics. Although there is no single morphological character that can distinguish with absolute certainty all three cryptic species, most show statistically significant interspecific differences in shape and size. We use five characters to describe two new species from Korea and to re-describe Tigriopus japonicus Mori, 1938 from near its type locality.
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Karanovic T, Koomput K, Sanoamuang LO. Two new Thermocyclops species (Copepoda, Cyclopoida) from Thailand, with notes on the genus phylogeny inferred from 18S and ITS sequences. ZOOL ANZ 2017. [DOI: 10.1016/j.jcz.2017.07.003] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
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Hwang AS, Pritchard VL, Edmands S. Recovery from hybrid breakdown in a marine invertebrate is faster, stronger and more repeatable under environmental stress. J Evol Biol 2016; 29:1793-803. [DOI: 10.1111/jeb.12913] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2015] [Accepted: 05/30/2016] [Indexed: 11/26/2022]
Affiliation(s)
- A. S. Hwang
- Department of Biological Sciences University of Southern California Los Angeles CA USA
| | - V. L. Pritchard
- Department of Biological Sciences University of Southern California Los Angeles CA USA
| | - S. Edmands
- Department of Biological Sciences University of Southern California Los Angeles CA USA
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Kronenberger JA, Funk WC, Smith JW, Fitzpatrick SW, Angeloni LM, Broder ED, Ruell EW. Testing the demographic effects of divergent immigrants on small populations of Trinidadian guppies. Anim Conserv 2016. [DOI: 10.1111/acv.12286] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Affiliation(s)
- J. A. Kronenberger
- Department of Biology Colorado State University Fort Collins CO USA
- Graduate Degree Program in Ecology Colorado State University Fort Collins CO USA
| | - W. C. Funk
- Department of Biology Colorado State University Fort Collins CO USA
- Graduate Degree Program in Ecology Colorado State University Fort Collins CO USA
| | - J. W. Smith
- Department of Biology Colorado State University Fort Collins CO USA
| | | | - L. M. Angeloni
- Department of Biology Colorado State University Fort Collins CO USA
- Graduate Degree Program in Ecology Colorado State University Fort Collins CO USA
| | - E. D. Broder
- Department of Biology Colorado State University Fort Collins CO USA
- Graduate Degree Program in Ecology Colorado State University Fort Collins CO USA
| | - E. W. Ruell
- Department of Biology Colorado State University Fort Collins CO USA
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9
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Havird JC, Fitzpatrick SW, Kronenberger J, Funk WC, Angeloni LM, Sloan DB. Sex, Mitochondria, and Genetic Rescue. Trends Ecol Evol 2015; 31:96-99. [PMID: 26712562 DOI: 10.1016/j.tree.2015.11.012] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2015] [Revised: 11/18/2015] [Accepted: 11/25/2015] [Indexed: 11/26/2022]
Abstract
Genetic rescue is a potentially effective management tool to offset the effects of reduced genetic diversity in imperiled populations. However, implementation requires complex choices. Here we address the consequences of introducing males versus females, highlighting the possibility that introduced females might lead to maladapted mitonuclear genomes and reduced offspring fitness.
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Affiliation(s)
- Justin C Havird
- Department of Biology, Colorado State University, 1878 Campus Delivery, Fort Collins, CO 80523, USA.
| | - Sarah W Fitzpatrick
- Department of Biology, Colorado State University, 1878 Campus Delivery, Fort Collins, CO 80523, USA; Kellogg Biological Station, Michigan State University, Hickory Corners, MI 49060, USA
| | - John Kronenberger
- Department of Biology, Colorado State University, 1878 Campus Delivery, Fort Collins, CO 80523, USA; Graduate Degree Program in Ecology, Colorado State University, Fort Collins, CO 80523, USA
| | - W Chris Funk
- Department of Biology, Colorado State University, 1878 Campus Delivery, Fort Collins, CO 80523, USA; Graduate Degree Program in Ecology, Colorado State University, Fort Collins, CO 80523, USA
| | - Lisa M Angeloni
- Department of Biology, Colorado State University, 1878 Campus Delivery, Fort Collins, CO 80523, USA; Graduate Degree Program in Ecology, Colorado State University, Fort Collins, CO 80523, USA
| | - Daniel B Sloan
- Department of Biology, Colorado State University, 1878 Campus Delivery, Fort Collins, CO 80523, USA; Graduate Degree Program in Ecology, Colorado State University, Fort Collins, CO 80523, USA
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Whiteley AR, Fitzpatrick SW, Funk WC, Tallmon DA. Genetic rescue to the rescue. Trends Ecol Evol 2015; 30:42-9. [DOI: 10.1016/j.tree.2014.10.009] [Citation(s) in RCA: 355] [Impact Index Per Article: 39.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2014] [Revised: 10/30/2014] [Accepted: 10/31/2014] [Indexed: 01/26/2023]
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Pritchard VL, Knutson VL, Lee M, Zieba J, Edmands S. Fitness and morphological outcomes of many generations of hybridization in the copepod Tigriopus californicus. J Evol Biol 2012; 26:416-33. [DOI: 10.1111/jeb.12060] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2012] [Revised: 10/23/2012] [Accepted: 10/24/2012] [Indexed: 12/27/2022]
Affiliation(s)
- V. L. Pritchard
- Department of Biological Sciences; University of Southern California; Los Angeles CA USA
| | - V. L. Knutson
- Department of Biological Sciences; University of Southern California; Los Angeles CA USA
| | - M. Lee
- Department of Biological Sciences; University of Southern California; Los Angeles CA USA
| | - J. Zieba
- Department of Biological Sciences; University of Southern California; Los Angeles CA USA
| | - S. Edmands
- Department of Biological Sciences; University of Southern California; Los Angeles CA USA
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