Glacial populations and postglacial migration of Douglas-fir based on fossil pollen and macrofossil evidence

Gugger, Paul F.; Sugita, S.

doi:10.1016/j.quascirev.2010.04.022

Cited by 38 publications

(48 citation statements)

References 253 publications

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“…Their vegetation histories as modelled in this study support separate and persistent interior and coastal populations, with the ice-covered Sierra Nevada serving as a topographic barrier during glacial periods (figure 2a, electronic supplementary material, figure S1Q and S1S). Modelled refugia for both species appear in the Sierra Nevada and Klamath Mountains on the coast and through the Arizona Mountains and southwest Tablelands in the interior, locations which are also confirmed by palaeoecological data [4,36]. Neither Pinus ponderosa nor Pseudotsuga menziesii projections suggest stable habitat north or west of the continental ice.…”

Section: (B) Widespread Trees With Subspecies Structurementioning

confidence: 66%

“…We must be careful, however, not to over-interpret habitat reconstructions at local scales. For example, fossil and genetic data suggest coastal populations of Pseudotsuga menziesii (electronic supplementary material, figure S1S) were north of the modelled distribution at the last glacial maximum [4,38]. This may reflect that the species has not migrated as far north as its climatic niche space would allow, and hence hind-casting their realized niche would cause under-predictions in this area.…”

Section: (D) Drivers Of Modern Genetic Diversitymentioning

confidence: 99%

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Glacial refugia and modern genetic diversity of 22 western North American tree species

2015

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North American tree species, subspecies and genetic varieties have primarily evolved in a landscape of extensive continental ice and restricted temperate climate environments. Here, we reconstruct the refugial history of western North American trees since the last glacial maximum using species distribution models, validated against 3571 palaeoecological records. We investigate how modern subspecies structure and genetic diversity corresponds to modelled glacial refugia, based on a meta-analysis of allelic richness and expected heterozygosity for 473 populations of 22 tree species. We find that species with strong genetic differentiation into subspecies had widespread and large glacial refugia, whereas species with restricted refugia show no differentiation among populations and little genetic diversity, despite being common over a wide range of environments today. In addition, a strong relationship between allelic richness and the size of modelled glacial refugia (r 2 ¼ 0.55) suggest that population bottlenecks during glacial periods had a pronounced effect on the presence of rare alleles.

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Section: (B) Widespread Trees With Subspecies Structurementioning

confidence: 66%

Section: (D) Drivers Of Modern Genetic Diversitymentioning

confidence: 99%

Glacial refugia and modern genetic diversity of 22 western North American tree species

2015

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“…), suggesting a role for environmentally mediated historical vicariance. Those studies identified centres of genetic diversity in the San Francisco Bay area and Transverse Ranges of southern California, which coincide with some glacial refugia in other taxa (Gugger & Sugita ). Given the inferred stability of local populations and expectations for stable populations without major bottlenecks under genetic drift, we hypothesize that niche stability leads to higher levels of genetic diversity (Carnaval et al .…”

Section: Introductionmentioning

confidence: 98%

Influence of late Quaternary climate change on present patterns of genetic variation in valley oak, Quercus lobata Née

2013

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Phylogeography and ecological niche models (ENMs) suggest that late Quaternary glacial cycles have played a prominent role in shaping present population genetic structure and diversity, but have not applied quantitative methods to dissect the relative contribution of past and present climate vs. other forces. We integrate multilocus phylogeography, climate-based ENMs and multivariate statistical approaches to infer the effects of late Quaternary climate change on contemporary genetic variation of valley oak (Quercus lobata Née). ENMs indicated that valley oak maintained a stable distribution with local migration from the last interglacial period (~120 ka) to the Last Glacial Maximum (~21 ka, LGM) to the present compared with large-scale range shifts for an eastern North American white oak (Quercus alba L.). Coast Range and Sierra Nevada foothill populations diverged in the late Pleistocene before the LGM [104 ka (28-1622)] and have occupied somewhat distinct climate niches, according to ENMs and coalescent analyses of divergence time. In accordance with neutral expectations for stable populations, nuclear microsatellite diversity positively correlated with niche stability from the LGM to present. Most strikingly, nuclear and chloroplast microsatellite variation significantly correlated with LGM climate, even after controlling for associations with geographic location and present climate using partial redundancy analyses. Variance partitioning showed that LGM climate uniquely explains a similar proportion of genetic variance as present climate (16% vs. 11-18%), and together, past and present climate explains more than geography (19%). Climate can influence local expansion-contraction dynamics, flowering phenology and thus gene flow, and/or impose selective pressures. These results highlight the lingering effect of past climate on genetic variation in species with stable distributions.

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“…). Before the Last Glacial Maximum (LGM, or Late Wisconsin, 18ka), both varieties occupied distinct glacial refugia (Gugger and Sugita ; Gugger et al. ; Wei et al.…”

Section: Introductionmentioning

confidence: 99%

Intervarietal and intravarietal genetic structure in Douglas‐fir: nuclear SSRs bring novel insights into past population demographic processes, phylogeography, and intervarietal hybridization

Loo

Pötzelsberger

Schüler

et al. 2015

Ecology and Evolution

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Douglas-fir (Pseudotsuga menziesii) is one of numerous wide-range forest tree species represented by subspecies/varieties, which hybridize in contact zones. This study examined the genetic structure of this North American conifer and its two hybridizing varieties, coastal and Rocky Mountain, at intervarietal and intravarietal level. The genetic structure was subsequently associated with the Pleistocene refugial history, postglacial migration and intervarietal hybridization/introgression. Thirty-eight populations from the USA and Canada were genotyped for 13 nuclear SSRs and analyzed with simulations and traditional population genetic structuring methods. Eight genetic clusters were identified. The coastal clusters embodied five refugial populations originating from five distinct refugia. Four coastal refugial populations, three from California and one from western Canada, diverged during the Pleistocene (56.9–40.1 ka). The three Rocky Mountain clusters reflected distinct refugial populations of three glacial refugia. For Canada, ice covered during the Last Glacial Maximum, we present the following three findings. (1) One refugial population of each variety was revealed in the north of the distribution range. Additional research including paleodata is required to support and determine whether both northern populations originated from cryptic refugia situated south or north of the ice-covered area. (2) An interplay between intravarietal gene flow of different refugial populations and intervarietal gene flow by hybridization and introgression was identified. (3) The Canadian hybrid zone displayed predominantly introgressants of the Rocky Mountain into the coastal variety. This study provides new insights into the complex Quaternary dynamics of this conifer essential for understanding its evolution (outside and inside the native range), adaptation to future climates and for forest management.

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Glacial populations and postglacial migration of Douglas-fir based on fossil pollen and macrofossil evidence

Cited by 38 publications

References 253 publications

Glacial refugia and modern genetic diversity of 22 western North American tree species

Glacial refugia and modern genetic diversity of 22 western North American tree species

Influence of late Quaternary climate change on present patterns of genetic variation in valley oak, Quercus lobata Née

Intervarietal and intravarietal genetic structure in Douglas‐fir: nuclear SSRs bring novel insights into past population demographic processes, phylogeography, and intervarietal hybridization

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