Genetic diversity and gene flow decline with elevation in montane mayflies

N. R. Polato, M. M. Gray, B. A. Gill, C. G. Becker, K. L. Casner, A. S. Flecker, B. C. Kondratieff, A. C. Encalada, N. L. Poff, W. C. Funk, K. R. Zamudio

    Research output: Contribution to journalArticle

    7 Citations (Scopus)

    Abstract

    Montane environments around the globe are biodiversity 'hotspots' and important reservoirs of genetic diversity. Montane species are also typically more vulnerable to environmental change than their low-elevation counterparts due to restricted ranges and dispersal limitations. Here we focus on two abundant congeneric mayflies (Baetis bicaudatus and B. tricaudatus) from montane streams over an elevation gradient spanning 1400 m. Using single-nucleotide polymorphism genotypes, we measured population diversity and vulnerability in these two species by: (i) describing genetic diversity and population structure across elevation gradients to identify mechanisms underlying diversification; (ii) performing spatially explicit landscape analyses to identify environmental drivers of differentiation; and (iii) identifying outlier loci hypothesized to underlie adaptive divergence. Differences in the extent of population structure in these species were evident depending upon their position along the elevation gradient. Heterozygosity, effective population sizes and gene flow all declined with increasing elevation, resulting in substantial population structure in the higher elevation species (B. bicaudatus). At lower elevations, populations of both species are more genetically similar, indicating ongoing gene flow. Isolation by distance was detected at lower elevations only, whereas landscape barriers better predicted genetic distance at higher elevations. At higher elevations, dispersal was restricted due to landscape effects, resulting in greater population isolation. Our results demonstrate differentiation over small spatial scales along an elevation gradient, and highlight the importance of preserving genetic diversity in more isolated high-elevation populations.

    Original languageEnglish
    Pages (from-to)107-116
    Number of pages10
    JournalHeredity
    Volume119
    Issue number2
    DOIs
    Publication statusPublished - 1 Aug 2017

    Fingerprint

    Gene Flow
    Population
    Biodiversity
    Population Density
    Ephemeroptera
    Single Nucleotide Polymorphism
    Genotype

    Cite this

    Polato, N. R., Gray, M. M., Gill, B. A., Becker, C. G., Casner, K. L., Flecker, A. S., ... Zamudio, K. R. (2017). Genetic diversity and gene flow decline with elevation in montane mayflies. Heredity, 119(2), 107-116. https://doi.org/10.1038/hdy.2017.23
    Polato, N. R. ; Gray, M. M. ; Gill, B. A. ; Becker, C. G. ; Casner, K. L. ; Flecker, A. S. ; Kondratieff, B. C. ; Encalada, A. C. ; Poff, N. L. ; Funk, W. C. ; Zamudio, K. R. / Genetic diversity and gene flow decline with elevation in montane mayflies. In: Heredity. 2017 ; Vol. 119, No. 2. pp. 107-116.
    @article{7abd92253bfb42d3b4f75c386229438e,
    title = "Genetic diversity and gene flow decline with elevation in montane mayflies",
    abstract = "Montane environments around the globe are biodiversity 'hotspots' and important reservoirs of genetic diversity. Montane species are also typically more vulnerable to environmental change than their low-elevation counterparts due to restricted ranges and dispersal limitations. Here we focus on two abundant congeneric mayflies (Baetis bicaudatus and B. tricaudatus) from montane streams over an elevation gradient spanning 1400 m. Using single-nucleotide polymorphism genotypes, we measured population diversity and vulnerability in these two species by: (i) describing genetic diversity and population structure across elevation gradients to identify mechanisms underlying diversification; (ii) performing spatially explicit landscape analyses to identify environmental drivers of differentiation; and (iii) identifying outlier loci hypothesized to underlie adaptive divergence. Differences in the extent of population structure in these species were evident depending upon their position along the elevation gradient. Heterozygosity, effective population sizes and gene flow all declined with increasing elevation, resulting in substantial population structure in the higher elevation species (B. bicaudatus). At lower elevations, populations of both species are more genetically similar, indicating ongoing gene flow. Isolation by distance was detected at lower elevations only, whereas landscape barriers better predicted genetic distance at higher elevations. At higher elevations, dispersal was restricted due to landscape effects, resulting in greater population isolation. Our results demonstrate differentiation over small spatial scales along an elevation gradient, and highlight the importance of preserving genetic diversity in more isolated high-elevation populations.",
    author = "Polato, {N. R.} and Gray, {M. M.} and Gill, {B. A.} and Becker, {C. G.} and Casner, {K. L.} and Flecker, {A. S.} and Kondratieff, {B. C.} and Encalada, {A. C.} and Poff, {N. L.} and Funk, {W. C.} and Zamudio, {K. R.}",
    year = "2017",
    month = "8",
    day = "1",
    doi = "10.1038/hdy.2017.23",
    language = "English",
    volume = "119",
    pages = "107--116",
    journal = "Heredity",
    issn = "0018-067X",
    publisher = "Nature Publishing Group",
    number = "2",

    }

    Polato, NR, Gray, MM, Gill, BA, Becker, CG, Casner, KL, Flecker, AS, Kondratieff, BC, Encalada, AC, Poff, NL, Funk, WC & Zamudio, KR 2017, 'Genetic diversity and gene flow decline with elevation in montane mayflies', Heredity, vol. 119, no. 2, pp. 107-116. https://doi.org/10.1038/hdy.2017.23

    Genetic diversity and gene flow decline with elevation in montane mayflies. / Polato, N. R.; Gray, M. M.; Gill, B. A.; Becker, C. G.; Casner, K. L.; Flecker, A. S.; Kondratieff, B. C.; Encalada, A. C.; Poff, N. L.; Funk, W. C.; Zamudio, K. R.

    In: Heredity, Vol. 119, No. 2, 01.08.2017, p. 107-116.

    Research output: Contribution to journalArticle

    TY - JOUR

    T1 - Genetic diversity and gene flow decline with elevation in montane mayflies

    AU - Polato, N. R.

    AU - Gray, M. M.

    AU - Gill, B. A.

    AU - Becker, C. G.

    AU - Casner, K. L.

    AU - Flecker, A. S.

    AU - Kondratieff, B. C.

    AU - Encalada, A. C.

    AU - Poff, N. L.

    AU - Funk, W. C.

    AU - Zamudio, K. R.

    PY - 2017/8/1

    Y1 - 2017/8/1

    N2 - Montane environments around the globe are biodiversity 'hotspots' and important reservoirs of genetic diversity. Montane species are also typically more vulnerable to environmental change than their low-elevation counterparts due to restricted ranges and dispersal limitations. Here we focus on two abundant congeneric mayflies (Baetis bicaudatus and B. tricaudatus) from montane streams over an elevation gradient spanning 1400 m. Using single-nucleotide polymorphism genotypes, we measured population diversity and vulnerability in these two species by: (i) describing genetic diversity and population structure across elevation gradients to identify mechanisms underlying diversification; (ii) performing spatially explicit landscape analyses to identify environmental drivers of differentiation; and (iii) identifying outlier loci hypothesized to underlie adaptive divergence. Differences in the extent of population structure in these species were evident depending upon their position along the elevation gradient. Heterozygosity, effective population sizes and gene flow all declined with increasing elevation, resulting in substantial population structure in the higher elevation species (B. bicaudatus). At lower elevations, populations of both species are more genetically similar, indicating ongoing gene flow. Isolation by distance was detected at lower elevations only, whereas landscape barriers better predicted genetic distance at higher elevations. At higher elevations, dispersal was restricted due to landscape effects, resulting in greater population isolation. Our results demonstrate differentiation over small spatial scales along an elevation gradient, and highlight the importance of preserving genetic diversity in more isolated high-elevation populations.

    AB - Montane environments around the globe are biodiversity 'hotspots' and important reservoirs of genetic diversity. Montane species are also typically more vulnerable to environmental change than their low-elevation counterparts due to restricted ranges and dispersal limitations. Here we focus on two abundant congeneric mayflies (Baetis bicaudatus and B. tricaudatus) from montane streams over an elevation gradient spanning 1400 m. Using single-nucleotide polymorphism genotypes, we measured population diversity and vulnerability in these two species by: (i) describing genetic diversity and population structure across elevation gradients to identify mechanisms underlying diversification; (ii) performing spatially explicit landscape analyses to identify environmental drivers of differentiation; and (iii) identifying outlier loci hypothesized to underlie adaptive divergence. Differences in the extent of population structure in these species were evident depending upon their position along the elevation gradient. Heterozygosity, effective population sizes and gene flow all declined with increasing elevation, resulting in substantial population structure in the higher elevation species (B. bicaudatus). At lower elevations, populations of both species are more genetically similar, indicating ongoing gene flow. Isolation by distance was detected at lower elevations only, whereas landscape barriers better predicted genetic distance at higher elevations. At higher elevations, dispersal was restricted due to landscape effects, resulting in greater population isolation. Our results demonstrate differentiation over small spatial scales along an elevation gradient, and highlight the importance of preserving genetic diversity in more isolated high-elevation populations.

    UR - http://www.scopus.com/inward/record.url?scp=85023605345&partnerID=8YFLogxK

    U2 - 10.1038/hdy.2017.23

    DO - 10.1038/hdy.2017.23

    M3 - Article

    VL - 119

    SP - 107

    EP - 116

    JO - Heredity

    JF - Heredity

    SN - 0018-067X

    IS - 2

    ER -

    Polato NR, Gray MM, Gill BA, Becker CG, Casner KL, Flecker AS et al. Genetic diversity and gene flow decline with elevation in montane mayflies. Heredity. 2017 Aug 1;119(2):107-116. https://doi.org/10.1038/hdy.2017.23