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Blondel L, Baillie L, Quinton J, Alemu JB, Paterson I, Hendry AP, Bentzen P. Evidence for contemporary and historical gene flow between guppy populations in different watersheds, with a test for associations with adaptive traits. Ecol Evol 2019; 9:4504-4517. [PMID: 31031923 PMCID: PMC6476793 DOI: 10.1002/ece3.5033] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2018] [Revised: 02/11/2019] [Accepted: 02/12/2019] [Indexed: 01/18/2023] Open
Abstract
In dendritic river systems, gene flow is expected to occur primarily within watersheds. Yet, rare cross-watershed transfers can also occur, whether mediated by (often historical) geological events or (often contemporary) human activities. We explored these events and their potential evolutionary consequences by analyzing patterns of neutral genetic variation (microsatellites) and adaptive phenotypic variation (male color) in wild guppies (Poecilia reticulata) distributed across two watersheds in northern Trinidad. We found the expected signatures of within-watershed gene flow; yet we also inferred at least two instances of cross-watershed gene flow-one in the upstream reaches and one further downstream. The upstream cross-watershed event appears to be very recent (41 ± 13 years), suggesting dispersal via recent flooding or undocumented human-mediated transport. The downstream cross-watershed event appears to be considerably older (577 ± 265 years), suggesting a role for rare geological or climatological events. Alongside these strong signatures of both contemporary and historical gene flow, we found little evidence of impacts on presumably adaptive phenotypic differentiation, except perhaps in the one instance of very recent cross-watershed gene flow. Selection in this system seems to overpower gene flow-at least on the spatiotemporal scales investigated here.
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Affiliation(s)
- Léa Blondel
- Redpath Museum and Department of BiologyMcGill UniversityMontrealQuébecCanada
| | - Lyndsey Baillie
- University of British ColumbiaVancouverBritish ColumbiaCanada
| | - Jessica Quinton
- Department of BiologyDalhousie UniversityHalifaxNova ScotiaCanada
| | - Jahson B. Alemu
- Department of Life SciencesThe University of the West IndiesSt. AugustineTrinidad and Tobago
| | - Ian Paterson
- Department of BiologyDalhousie UniversityHalifaxNova ScotiaCanada
| | - Andrew P. Hendry
- Redpath Museum and Department of BiologyMcGill UniversityMontrealQuébecCanada
| | - Paul Bentzen
- Department of BiologyDalhousie UniversityHalifaxNova ScotiaCanada
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2
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Oke KB, Motivans E, Quinn TP, Hendry AP. Sexual dimorphism modifies habitat‐associated divergence: Evidence from beach and creek breeding sockeye salmon. J Evol Biol 2018; 32:227-242. [DOI: 10.1111/jeb.13407] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2018] [Revised: 11/17/2018] [Accepted: 11/20/2018] [Indexed: 12/13/2022]
Affiliation(s)
- Krista B. Oke
- Department of Biology and Redpath Museum McGill University Montreal Quebec Canada
- College of Fisheries and Ocean Sciences University of Alaska Fairbanks Juneau Alaska
| | - Elena Motivans
- Department of Biology and Redpath Museum McGill University Montreal Quebec Canada
- Helmholtz Centre for Environmental Research Leipzig Germany
| | - Thomas P. Quinn
- School of Aquatic and Fishery Sciences University of Washington Seattle Washington
| | - Andrew P. Hendry
- Department of Biology and Redpath Museum McGill University Montreal Quebec Canada
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3
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Bolnick DI, Barrett RD, Oke KB, Rennison DJ, Stuart YE. (Non)Parallel Evolution. ANNUAL REVIEW OF ECOLOGY EVOLUTION AND SYSTEMATICS 2018. [DOI: 10.1146/annurev-ecolsys-110617-062240] [Citation(s) in RCA: 155] [Impact Index Per Article: 25.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Parallel evolution across replicate populations has provided evolutionary biologists with iconic examples of adaptation. When multiple populations colonize seemingly similar habitats, they may evolve similar genes, traits, or functions. Yet, replicated evolution in nature or in the laboratory often yields inconsistent outcomes: Some replicate populations evolve along highly similar trajectories, whereas other replicate populations evolve to different extents or in distinct directions. To understand these heterogeneous outcomes, biologists are increasingly treating parallel evolution not as a binary phenomenon but rather as a quantitative continuum ranging from parallel to nonparallel. By measuring replicate populations’ positions along this (non)parallel continuum, we can test hypotheses about evolutionary and ecological factors that influence the extent of repeatable evolution. We review evidence regarding the manifestation of (non)parallel evolution in the laboratory, in natural populations, and in applied contexts such as cancer. We enumerate the many genetic, ecological, and evolutionary processes that contribute to variation in the extent of parallel evolution.
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Affiliation(s)
- Daniel I. Bolnick
- Department of Integrative Biology, University of Texas at Austin, Austin, Texas 78712, USA
- Current affiliation: Department of Ecology and Evolution, University of Connecticut, Storrs, Connecticut 06268, USA
| | | | - Krista B. Oke
- Redpath Museum, McGill University, Montreal, Quebec H3A 2K6, Canada
- Department of Ecology and Evolutionary Biology, University of California, Santa Cruz, California 95060, USA
| | - Diana J. Rennison
- Institute of Ecology and Evolution, University of Bern, 3012 Bern, Switzerland
| | - Yoel E. Stuart
- Department of Integrative Biology, University of Texas at Austin, Austin, Texas 78712, USA
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4
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Phenotypic and genetic divergence among island populations of sika deer (Cervus nippon) in southern Japan: a test of the local adaptation hypothesis. POPUL ECOL 2018. [DOI: 10.1007/s10144-018-0607-8] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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5
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Fitzpatrick SW, Handelsman CA, Torres-Dowdall J, Ruell EW, Broder ED, Kronenberger JA, Reznick DN, Ghalambor CK, Angeloni LM, Funk WC. Gene Flow Constrains and Facilitates Genetically Based Divergence in Quantitative Traits. COPEIA 2017. [DOI: 10.1643/ci-16-559] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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6
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Pépino M, Magnan P, Proulx R. Field evidence for a rapid adaptive plastic response in morphology and growth of littoral and pelagic brook charr: A reciprocal transplant experiment. Funct Ecol 2017. [DOI: 10.1111/1365-2435.12929] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Affiliation(s)
- Marc Pépino
- Centre de recherche sur les interactions bassins versants – écosystèmes aquatiques (RIVE)Université du Québec à Trois‐Rivières Trois‐Rivières Québec Canada
| | - Pierre Magnan
- Centre de recherche sur les interactions bassins versants – écosystèmes aquatiques (RIVE)Université du Québec à Trois‐Rivières Trois‐Rivières Québec Canada
| | - Raphaël Proulx
- Centre de recherche sur les interactions bassins versants – écosystèmes aquatiques (RIVE)Université du Québec à Trois‐Rivières Trois‐Rivières Québec Canada
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7
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Oke KB, Rolshausen G, LeBlond C, Hendry AP. How Parallel Is Parallel Evolution? A Comparative Analysis in Fishes. Am Nat 2017; 190:1-16. [DOI: 10.1086/691989] [Citation(s) in RCA: 75] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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8
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Stutz WE, Bolnick DI. Natural selection on MHC IIβ in parapatric lake and stream stickleback: Balancing, divergent, both or neither? Mol Ecol 2017; 26:4772-4786. [PMID: 28437583 DOI: 10.1111/mec.14158] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2016] [Revised: 04/18/2017] [Accepted: 04/19/2017] [Indexed: 12/12/2022]
Abstract
Major histocompatibility complex (MHC) genes encode proteins that play a central role in vertebrates' adaptive immunity to parasites. MHC loci are among the most polymorphic in vertebrates' genomes, inspiring many studies to identify evolutionary processes driving MHC polymorphism within populations and divergence between populations. Leading hypotheses include balancing selection favouring rare alleles within populations, and spatially divergent selection. These hypotheses do not always produce diagnosably distinct predictions, causing many studies of MHC to yield inconsistent or ambiguous results. We suggest a novel strategy to distinguish balancing vs. divergent selection on MHC, taking advantage of natural admixture between parapatric populations. With divergent selection, individuals with immigrant alleles will be more infected and less fit because they are susceptible to novel parasites in their new habitat. With balancing selection, individuals with locally rare immigrant alleles will be more fit (less infected). We tested these contrasting predictions using three-spine stickleback from three replicate pairs of parapatric lake and stream habitats. We found numerous positive and negative associations between particular MHC IIβ alleles and particular parasite taxa. A few allele-parasite comparisons supported balancing selection, and others supported divergent selection between habitats. But, there was no overall tendency for fish with immigrant MHC alleles to be more or less heavily infected. Instead, locally rare MHC alleles (not necessarily immigrants) were associated with heavier infections. Our results illustrate the complex relationship between MHC IIβ allelic variation and spatially varying multispecies parasite communities: different hypotheses may be concurrently true for different allele-parasite combinations.
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Affiliation(s)
- William E Stutz
- Department of Integrative Biology, University of Texas at Austin, Austin, TX, USA.,Department of Ecology and Evolutionary Biology, University of Colorado at Boulder, Boulder, CO, USA
| | - Daniel I Bolnick
- Department of Integrative Biology, University of Texas at Austin, Austin, TX, USA
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Weber JN, Bradburd GS, Stuart YE, Stutz WE, Bolnick DI. Partitioning the effects of isolation by distance, environment, and physical barriers on genomic divergence between parapatric threespine stickleback. Evolution 2016; 71:342-356. [DOI: 10.1111/evo.13110] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2016] [Accepted: 10/15/2016] [Indexed: 01/09/2023]
Affiliation(s)
- Jesse N. Weber
- Department of Integrative Biology University of Texas at Austin Austin Texas 78712
- Division of Biological Sciences University of Montana Missoula Montana 59801
| | - Gideon S. Bradburd
- Department of Integrative Biology Michigan State University East Lansing Michigan 48824
| | - Yoel E. Stuart
- Department of Integrative Biology University of Texas at Austin Austin Texas 78712
| | - William E. Stutz
- Department of Integrative Biology University of Texas at Austin Austin Texas 78712
- Department of Ecology and Evolutionary Biology University of Colorado at Boulder Boulder Colorado 80309
| | - Daniel I. Bolnick
- Department of Integrative Biology University of Texas at Austin Austin Texas 78712
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10
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Camacho C, Sáez P, Sánchez S, Palacios S, Molina C, Potti J. The road to opportunities: landscape change promotes body-size divergence in a highly mobile species. Curr Zool 2016; 62:7-14. [PMID: 29491885 PMCID: PMC5804134 DOI: 10.1093/cz/zov008] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2015] [Accepted: 04/23/2015] [Indexed: 11/16/2022] Open
Abstract
Landscape change provides a suitable framework for investigating population-level responses to novel ecological pressures. However, relatively little attention has been paid to examine the potential influence of landscape change on the geographic scale of population differentiation. Here, we tested for morphological differentiation of red-necked nightjars Caprimulgus ruficollis breeding in a managed property and a natural reserve situated less than 10 km apart. At both sites, we also estimated site fidelity over 5 years and quantified the potential foraging opportunities for nightjars. Breeding birds in the managed habitat were significantly larger in size—as indexed by keel length—than those in the natural one. However, there were no significant differences in wing or tail length. Immigration from neighboring areas was almost negligible and, furthermore, no individual (out of 1130 captures overall) exchanged habitats between years, indicating strong site fidelity. Food supply for nightjars was equally abundant in both habitats, but the availability of foraging sites was remarkably higher in the managed property. As a result, nightjars—particularly fledglings—in the latter habitat benefited from increased foraging opportunities in relation to those in the natural site. It seems likely that the fine-scale variation in nightjar morphology reflects a phenotypic response to unequal local conditions, since non-random dispersal or differential mortality had been determined not to be influential. High site fidelity appears to contribute to the maintenance of body-size differences between the two habitats. Results from this nightjar population highlight the potential of human-induced landscape change to promote population-level responses at exceedingly small geographic scales.
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Affiliation(s)
- Carlos Camacho
- Department of Evolutionary Ecology, Estación Biológica de Doñana-CSIC, Av. Américo Vespucio, 41092 Seville, Spain
| | - Pedro Sáez
- Department of Environmental Biology and Public Health. University of Huelva. Av. Andalucía, 21071 Huelva, Spain
| | - Sonia Sánchez
- Department of Evolutionary Ecology, Estación Biológica de Doñana-CSIC, Av. Américo Vespucio, 41092 Seville, Spain
| | - Sebastián Palacios
- Department of Conservation Biology, Estación Biológica de Doñana-CSIC, Av. Américo Vespucio, 41092 Seville, Spain, and
| | - Carlos Molina
- Sociedad Española de Ornitología. Centro Ornitológico Francisco Bernis. Paseo Marismeño sn, 21750 Huelva, Spain
| | - Jaime Potti
- Department of Evolutionary Ecology, Estación Biológica de Doñana-CSIC, Av. Américo Vespucio, 41092 Seville, Spain
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11
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Oke KB, Bukhari M, Kaeuffer R, Rolshausen G, Räsänen K, Bolnick DI, Peichel CL, Hendry AP. Does plasticity enhance or dampen phenotypic parallelism? A test with three lake–stream stickleback pairs. J Evol Biol 2015; 29:126-43. [DOI: 10.1111/jeb.12767] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2015] [Revised: 09/18/2015] [Accepted: 09/21/2015] [Indexed: 12/19/2022]
Affiliation(s)
- K. B. Oke
- Redpath Museum and Department of Biology McGill University Montreal QC Canada
| | - M. Bukhari
- Redpath Museum and Department of Biology McGill University Montreal QC Canada
| | - R. Kaeuffer
- Redpath Museum and Department of Biology McGill University Montreal QC Canada
| | - G. Rolshausen
- Redpath Museum and Department of Biology McGill University Montreal QC Canada
| | - K. Räsänen
- Department of Aquatic Ecology Eawag and Institute of Integrative Biology ETH‐Zurich Duebendorf Switzerland
| | - D. I. Bolnick
- Department of Integrative Biology University of Texas at Austin Austin TX USA
| | - C. L. Peichel
- Divisions of Basic Sciences and Human Biology Fred Hutchinson Cancer Research Center Seattle WA USA
| | - A. P. Hendry
- Redpath Museum and Department of Biology McGill University Montreal QC Canada
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12
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Rolshausen G, Phillip DAT, Beckles DM, Akbari A, Ghoshal S, Hamilton PB, Tyler CR, Scarlett AG, Ramnarine I, Bentzen P, Hendry AP. Do stressful conditions make adaptation difficult? Guppies in the oil-polluted environments of southern Trinidad. Evol Appl 2015; 8:854-70. [PMID: 26495039 PMCID: PMC4610383 DOI: 10.1111/eva.12289] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2015] [Accepted: 05/26/2015] [Indexed: 12/27/2022] Open
Abstract
The ability of populations to rapidly adapt to new environments will determine their future in an increasingly human-modified world. Although meta-analyses do frequently uncover signatures of local adaptation, they also reveal many exceptions. We suggest that particular constraints on local adaptation might arise when organisms are exposed to novel stressors, such as anthropogenic pollution. To inform this possibility, we studied the extent to which guppies (Poecilia reticulata) show local adaptation to oil pollution in southern Trinidad. Neutral genetic markers revealed that paired populations in oil-polluted versus not-polluted habitats diverged independently in two different watersheds. Morphometrics revealed some divergence (particularly in head shape) between these environments, some of which was parallel between rivers. Reciprocal transplant experiments in nature, however, found little evidence of local adaptation based on survival and growth. Moreover, subsequent laboratory experiments showed that the two populations from oil-polluted sites showed only weak local adaptation even when compared to guppies from oil-free northern Trinidad. We conclude that guppies show little local adaptation to oil pollution, which might result from the challenges associated with adaptation to particularly stressful environments. It might also reflect genetic drift owing to small population sizes and/or high gene flow between environments.
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Affiliation(s)
- Gregor Rolshausen
- Redpath Museum and Department of Biology, McGill University Montreal, QC, Canada
| | - Dawn A T Phillip
- Department of Life Sciences, The University of the West Indies St. Augustine, Trinidad and Tobago
| | - Denise M Beckles
- Department of Chemistry, The University of the West Indies St. Augustine, Trinidad and Tobago
| | - Ali Akbari
- Department of Civil Engineering and Applied Mechanics, McGill University Montreal, QC, Canada
| | - Subhasis Ghoshal
- Department of Civil Engineering and Applied Mechanics, McGill University Montreal, QC, Canada
| | | | | | - Alan G Scarlett
- Biochemistry Research Center, University of Plymouth Drake Circus, Plymouth, UK
| | - Indar Ramnarine
- Department of Life Sciences, The University of the West Indies St. Augustine, Trinidad and Tobago
| | - Paul Bentzen
- Department of Biology, Dalhousie University Halifax, NS, Canada
| | - Andrew P Hendry
- Redpath Museum and Department of Biology, McGill University Montreal, QC, Canada
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13
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Rolshausen G, Muttalib S, Kaeuffer R, Oke KB, Hanson D, Hendry AP. When maladaptive gene flow does not increase selection. Evolution 2015. [DOI: 10.1111/evo.12739] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Gregor Rolshausen
- Redpath Museum and Department of Biology; McGill University; 859 Sherbrooke St. W. Montreal Quebec H3A0C4 Canada
| | - Shahin Muttalib
- Redpath Museum and Department of Biology; McGill University; 859 Sherbrooke St. W. Montreal Quebec H3A0C4 Canada
| | - Renaud Kaeuffer
- Redpath Museum and Department of Biology; McGill University; 859 Sherbrooke St. W. Montreal Quebec H3A0C4 Canada
| | - Krista B. Oke
- Redpath Museum and Department of Biology; McGill University; 859 Sherbrooke St. W. Montreal Quebec H3A0C4 Canada
| | - Dieta Hanson
- Redpath Museum and Department of Biology; McGill University; 859 Sherbrooke St. W. Montreal Quebec H3A0C4 Canada
| | - Andrew P. Hendry
- Redpath Museum and Department of Biology; McGill University; 859 Sherbrooke St. W. Montreal Quebec H3A0C4 Canada
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14
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Stutz WE, Schmerer M, Coates JL, Bolnick DI. Among-lake reciprocal transplants induce convergent expression of immune genes in threespine stickleback. Mol Ecol 2015; 24:4629-46. [PMID: 26118468 DOI: 10.1111/mec.13295] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2015] [Revised: 06/22/2015] [Accepted: 06/24/2015] [Indexed: 12/25/2022]
Abstract
Geographic variation in parasite communities can drive evolutionary divergence in host immune genes. However, biotic and abiotic environmental variation can also induce plastic differences in immune function among populations. At present, there is little information concerning the relative magnitudes of heritable vs. induced immune divergence in natural populations. We examined immune gene expression profiles of threespine stickleback (Gasterosteus aculeatus) from six lakes on Vancouver Island, British Columbia. Parasite community composition differs between lake types (large or small, containing limnetic- or benthic-like stickleback) and between watersheds. We observed corresponding differences in immune gene expression profiles among wild-caught stickleback, using a set of seven immune genes representing distinct branches of the immune system. To evaluate the role of environmental effects on this differentiation, we experimentally transplanted wild-caught fish into cages in their native lake, or into a nearby foreign lake. Transplanted individuals' immune gene expression converged on patterns typical of their destination lake, deviating from their native expression profile. Transplant individuals' source population had a much smaller effect, suggesting relatively weak genetic underpinning of population differences in immunity, as viewed through gene expression. This strong environmental regulation of immune gene expression provides a counterpoint to the large emerging literature documenting microevolution and genetic diversification of immune function. Our findings illustrate the value of studying immunity in natural environmental settings where the immune system has evolved and actively functions.
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Affiliation(s)
- William E Stutz
- Department of Integrative Biology, University of Texas at Austin, One University Station C0990, Austin, TX, 78712, USA
| | - Matthew Schmerer
- Department of Integrative Biology, University of Texas at Austin, One University Station C0990, Austin, TX, 78712, USA
| | - Jessica L Coates
- Department of Biology, Spelman College, 350 Spelman Lane SW, Atlanta, GA, 30314, USA
| | - Daniel I Bolnick
- Department of Integrative Biology, University of Texas at Austin, One University Station C0990, Austin, TX, 78712, USA.,Howard Hughes Medical Institute, University of Texas at Austin, One University Station C0990, Austin, TX, 78712, USA
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15
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Warwick AR, Travis J, Lemmon EM. Geographic variation in the Pine Barrens Treefrog (Hyla andersonii): concordance of genetic, morphometric and acoustic signal data. Mol Ecol 2015; 24:3281-98. [DOI: 10.1111/mec.13242] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2014] [Revised: 05/07/2015] [Accepted: 05/08/2015] [Indexed: 11/29/2022]
Affiliation(s)
- Alexa R. Warwick
- Department of Biological Science; Florida State University; 319 Stadium Drive Tallahassee FL 32306 USA
| | - Joseph Travis
- Department of Biological Science; Florida State University; 319 Stadium Drive Tallahassee FL 32306 USA
| | - Emily Moriarty Lemmon
- Department of Biological Science; Florida State University; 319 Stadium Drive Tallahassee FL 32306 USA
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16
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Dietary input of microbes and host genetic variation shape among-population differences in stickleback gut microbiota. ISME JOURNAL 2015; 9:2515-26. [PMID: 25909977 DOI: 10.1038/ismej.2015.64] [Citation(s) in RCA: 182] [Impact Index Per Article: 20.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/06/2014] [Revised: 02/11/2015] [Accepted: 03/25/2015] [Indexed: 02/06/2023]
Abstract
To explain differences in gut microbial communities we must determine how processes regulating microbial community assembly (colonization, persistence) differ among hosts and affect microbiota composition. We surveyed the gut microbiota of threespine stickleback (Gasterosteus aculeatus) from 10 geographically clustered populations and sequenced environmental samples to track potential colonizing microbes and quantify the effects of host environment and genotype. Gut microbiota composition and diversity varied among populations. These among-population differences were associated with multiple covarying ecological variables: habitat type (lake, stream, estuary), lake geomorphology and food- (but not water-) associated microbiota. Fish genotype also covaried with gut microbiota composition; more genetically divergent populations exhibited more divergent gut microbiota. Our results suggest that population level differences in stickleback gut microbiota may depend more on internal sorting processes (host genotype) than on colonization processes (transient environmental effects).
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17
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Fitzpatrick SW, Gerberich JC, Kronenberger JA, Angeloni LM, Funk WC. Locally adapted traits maintained in the face of high gene flow. Ecol Lett 2014; 18:37-47. [PMID: 25363522 DOI: 10.1111/ele.12388] [Citation(s) in RCA: 61] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2014] [Revised: 06/06/2014] [Accepted: 10/01/2014] [Indexed: 11/26/2022]
Abstract
Gene flow between phenotypically divergent populations can disrupt local adaptation or, alternatively, may stimulate adaptive evolution by increasing genetic variation. We capitalised on historical Trinidadian guppy transplant experiments to test the phenotypic effects of increased gene flow caused by replicated introductions of adaptively divergent guppies, which were translocated from high- to low-predation environments. We sampled two native populations prior to the onset of gene flow, six historic introduction sites, introduction sources and multiple downstream points in each basin. Extensive gene flow from introductions occurred in all streams, yet adaptive phenotypic divergence across a gradient in predation level was maintained. Descendants of guppies from a high-predation source site showed high phenotypic similarity with native low-predation guppies in as few as ~12 generations after gene flow, likely through a combination of adaptive evolution and phenotypic plasticity. Our results demonstrate that locally adapted phenotypes can be maintained despite extensive gene flow from divergent populations.
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Affiliation(s)
- S W Fitzpatrick
- Department of Biology, Colorado State University, 1878 Campus Delivery, Fort Collins, CO, 80523, USA
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18
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Affiliation(s)
- K. Petren
- Department of Biological Sciences; University of Cincinnati; Cincinnati Ohio 45221
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