Influence of northern limit range on genetic diversity and structure in a widespread North American tree, sugar maple (<i>Acer saccharum</i>Marshall)

Graignic, Noémie; Tremblay, Francine; Bergeron, Yves

doi:10.1002/ece3.3906

Cited by 16 publications

(8 citation statements)

References 83 publications

(141 reference statements)

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“…Population history and mutational load at the range edge 471Populations along range margins are predicted to be small, limiting their ability to adapt to local 472 conditions (although seeMoeller et al 2011;Graignic et al 2018). Although we cannot assess 473 relative differences in Ne across the entire hare range, we uncovered high Ne estimates across 474 PNW populations (161654-257219; Table 1), despite evidence for strong ancient population size 475 reductions.…”

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The origin and spread of locally adaptive seasonal camouflage in snowshoe hares

Jones

Mills

Jensen

et al. 2019

Preprint

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9Adaptation is central to population persistence in the face of environmental change, yet we rarely 10 precisely understand the origin and spread of adaptive variation in natural populations. Snowshoe 11 hares (Lepus americanus) along the Pacific Northwest (PNW) coast have evolved brown winter 12 camouflage through positive selection on recessive variation at the Agouti pigmentation gene 13 introgressed from black-tailed jackrabbits (L. californicus). Here we combine new and published 14 whole genome and exome sequences with targeted genotyping of Agouti in order to investigate 15 the evolutionary history of local seasonal camouflage adaptation in the PNW. We find evidence 16 of significantly elevated inbreeding and mutational load in coastal winter-brown hares, consistent 17 with a recent range expansion into temperate coastal environments that incurred indirect fitness 18 costs. The genome-wide distribution of introgression tract lengths supports a pulse of 19 hybridization near the end of the last glacial maximum, which may have facilitated range 20 expansion via introgression of winter-brown camouflage variation. However, signatures of a 21 selective sweep at Agouti indicate a much more recent spread of winter-brown camouflage. 22Through simulations we show that the temporal lag between the hybrid origin and subsequent 23 selective sweep of the recessive winter-brown allele can be largely attributed to the limits of 24 natural selection imposed by simple allelic dominance. We argue that while hybridization during 25 periods of environmental change may provide a critical reservoir of adaptive variation at range 26 edges, the probability and pace of local adaptation will strongly depend on population 27 demography and the genetic architecture of introgressed variation. 28 individual inbreeding and mutational load along range edges may also reflect past histories of 52 adaptation and range expansion that result in non-equilibrium population dynamics. For instance, 53 mating between close relatives may increase in founder populations that have recently undergone 54 severe population contractions associated with range expansions (Frankham 1998). Likewise, 55 mutational load may be amplified through the colonization of new environments because 56 population contractions reduce the efficacy of selection against deleterious alleles at the 57 expansion front (i.e., expansion load; Peischl et al. 2013;Henn et al. 2016; González-Martínez et 58 al. 2017;Willi et al. 2018). Thus, when adaptation does occur along range margins it may 59 produce negative feedbacks on population fitness and evolutionary potential. 60Patterns of migration into range edge populations are also pivotal to their fitness and 61 adaptive potential. Larger core populations are expected to produce relatively more migrants 62 than smaller edge populations, leading to asymmetric rates of gene flow between core and 63 peripheral habitats. In extreme scenarios, edge populations with low population growth rates 64 (l<1) can be demographic sinks that ar...

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The origin and spread of locally adaptive seasonal camouflage in snowshoe hares

Jones

Mills

Jensen

et al. 2019

Preprint

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“…Dicksonia navarrensis presented low genetic diversity (mean H E = 0.36) compared to other species of the same genera, such as D . sellowiana (mean H E = 0.50, Fagundes et al, 2020), or with respect to Alsophila spinulosa (mean H E = 0.45, Zhou et al, 2008), probably as a result of the high degree of fragmentation and loss of its habitat, the montane cloud forest of Mexico (INEGI, 2017), which affects the connectivity between its populations (Graignic et al, 2018). However, it must be considered that habitat loss and fragmentation in other fern species ( Pleopeltis crassinervata and Polypodium rhodopleuron ) did not have a strong influence on genetic diversity because it remained high; mean H E = 0.257 and 0.223, respectively (Winkler et al, 2011).…”

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confidence: 99%

Diversity and Genetic Structure of Dicksonia navarrensis (Dicksoniaceae) Populations in the Mexican Sierra Madre Oriental

Reyes-Ortiz

Octavio‐Aguilar

López–Mata

et al. 2022

Tropical Conservation Science

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Background and Research Aims Dicksonia navarrensis is a species of tree fern at risk of extinction, distributed in the montane cloud forest (MCF) of the Americas from the central region of Mexico to Ecuador. In Mexico, populations of this species grow in primary vegetation of the MCF, in a matrix with a high degree of fragmentation and under threat of disappearance. Methods In the present study, the diversity and genetic structure of seven populations of D. navarrensis that are distributed in the cloud forest of the Sierra Madre Oriental were evaluated, with both standard laboratory and statistical analysis techniques, using 11 microsatellites developed for the genus Dicksonia. Results A total of 33 alleles were found. Genetic diversity differed between populations, and some presented low heterozygosity. Using assignment tests, three genetic groups were identified, associated with the geographical distribution of the populations; those from the north maintain connectivity with each other but diverge highly from the populations in the south, probably due to processes of isolation by distance (local environment), genetic drift, and natural selection. Conclusion The northernmost population, which is more isolated from the rest, has a broader genetic reservoir, which can be useful for maintaining the genetic diversity of the species. In the other populations, with less genetic diversity, the introduction of individuals and/or the dispersion of spores is important, to maintain and increase the genetic variability that they still possess, but which could disappear in a short time if their habitat continues to deteriorate at a high degree. Implications for Conservation The results obtained provide basic information that can be used in management and conservation plans, because the populations with the greatest genetic diversity and the possible processes that are influencing the genetic structure of the species were identified.

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“…Population history and mutational load at the range edge Populations along range margins are predicted to be small, limiting their ability to adapt to local conditions (although see Moeller et al 2011;Graignic et al 2018). Although we cannot assess relative differences in Ne across the entire hare range, we uncovered high Ne estimates across PNW populations (161654-257219; Table 1), despite evidence for strong ancient population size reductions.…”

Section: Discussionmentioning

confidence: 99%

The Origin and Spread of Locally Adaptive Seasonal Camouflage in Snowshoe Hares

Jones

Mills

Jensen

et al. 2020

The American Naturalist

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Adaptation is central to population persistence in the face of environmental change, yet we rarely precisely understand the origin and spread of adaptive variation in natural populations. Snowshoe hares (Lepus americanus) along the Pacific Northwest (PNW) coast have evolved brown winter camouflage through positive selection on recessive variation at the Agouti pigmentation gene introgressed from black-tailed jackrabbits (L. californicus). Here we combine new and published whole genome and exome sequences with targeted genotyping of Agouti in order to investigate the evolutionary history of local seasonal camouflage adaptation in the PNW. We find evidence of significantly elevated inbreeding and mutational load in coastal winter-brown hares, consistent with a recent range expansion into temperate coastal environments that incurred indirect fitness costs. The genome-wide distribution of introgression tract lengths supports a pulse of hybridization near the end of the last glacial maximum, which may have facilitated range expansion via introgression of winter-brown camouflage variation. However, signatures of a selective sweep at Agouti indicate a much more recent spread of winter-brown camouflage.Through simulations we show that the temporal lag between the hybrid origin and subsequent selective sweep of the recessive winter-brown allele can be largely attributed to the limits of natural selection imposed by simple allelic dominance. We argue that while hybridization during periods of environmental change may provide a critical reservoir of adaptive variation at range edges, the probability and pace of local adaptation will strongly depend on population demography and the genetic architecture of introgressed variation.

show abstract

Influence of northern limit range on genetic diversity and structure in a widespread North American tree, sugar maple (Acer saccharumMarshall)

Cited by 16 publications

References 83 publications

The origin and spread of locally adaptive seasonal camouflage in snowshoe hares

The origin and spread of locally adaptive seasonal camouflage in snowshoe hares

Diversity and Genetic Structure of Dicksonia navarrensis (Dicksoniaceae) Populations in the Mexican Sierra Madre Oriental

The Origin and Spread of Locally Adaptive Seasonal Camouflage in Snowshoe Hares

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