Spatiotemporal niche overlap, asymmetric reproductive interference, and population genetics between the sympatric species,
            <i>Rhododendron diversipilosum</i>
            and
            <i>Rhododendron subarcticum</i>
            , in alpine fellfield habitat

Shiotani, Yuki; Kudo, Gaku

doi:10.1080/15230430.2023.2188716

Cited by 4 publications

(1 citation statement)

References 52 publications

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“…3a, S7; Appendix S1). Similarly, habitats and owering periods overlap between the Labrador tea species tetraploid R. diversipilosum and diploid R. subarcticum (a synonym of R. tomentosum; Elven & Murray, 2008) in Japanese alpine areas, and germination rates of hybrid seeds are considerably low due to the difference in chromosome number (Shiotani & Kudo, 2023).…”

Section: Population and Permafrostmentioning

confidence: 99%

Variations in permafrost environments determine populations and leaf traits of two closely related common shrub species (Rhododendron subsect. Ledum) in Interior Alaska

Amada,

Iwahana,

Noguchi

et al. 2023

Preprint

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Permafrost considerably influences boreal forest ecosystems by constraining the niche space of woody plants. The permafrost influence on the ecosystems could dramatically change with permafrost thawing owing to recent rapid climate warming. However, it remains unclear how shrub species dominating the understory in boreal forests are associated with the permafrost environments. We investigated two closely related common shrubs, Labrador teas (Ericaceae,Rhododendron subsect. Ledum): R. groenlandicum and R. tomentosum, which exist sympatrically in the discontinuous permafrost zone of the Interior Alaska. We employed field surveys and trait measurements across permafrost gradients under the same climatic conditions to examine the associations among permafrost environments, populations, and leaf traits of the two species. Contrastive habitats were found between the two species: R. groenlandicum is abundant under darker, drier, thicker-active-layer conditions, whereas R. tomentosum is common under brighter, wetter, thinner-active-layer conditions. This suggests that habitat segregation between these species occurs in the discontinuous permafrost zone. Rhododendron tomentosum dominating permafrost conditions had more conservative leaves compared to R. groenlandicum. Moreover, both species had more conservative leaves under permafrost conditions. These intraspecific variations were mainly directly associated with canopy openness in R. groenlandicumbut with active-layer thickness in R. tomentosum. In summary, our study suggests that large environmental variations driven by the inhomogeneous permafrost distributions can lead to the sympatric distributions of closely related shrub species in the discontinuous permafrost zone, and that the conservative leaves can contribute to their adaptation under permafrost conditions.

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Section: Population and Permafrostmentioning

confidence: 99%

Variations in permafrost environments determine populations and leaf traits of two closely related common shrub species (Rhododendron subsect. Ledum) in Interior Alaska

Amada,

Iwahana,

Noguchi

et al. 2023

Preprint

View full text Add to dashboard Cite

show abstract

Permafrost conditions influence the abundance, distribution, and leaf traits of two closely related dominant shrub species (Rhododendron subsect. Ledum) in interior Alaska

Amada,

Iwahana,

Noguchi

et al. 2024

Polar Biol

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Confusing boundaries of the Labrador tea species: dispersal history explains the lack of clear species structure

Iunusova,

Polezhaeva,

Marchuk

2024

Annals of Botany

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Background and Aims The Labrador Teas (genus Rhododendron, subsection Ledum) are a complex of species widely distributed in the Northern Hemisphere. They occupy cold-resistant plant communities from highlands to forest understory and wetland habitats almost circumboreally and they are especially abundant in Northeast Asia (NE Asia) and northern North America (NN Am), still there are no clear species boundaries in this group. The genetic structure of species of the subsect. Ledum from Eurasia and North America as well as the dispersal history of the group require clarification. Methods Phylogeny and biogeography of the subsect. Ledum of the genus Rhododendron were assessed using phylogenetic trees constructed based on the analysis of variation in chloroplast petB-petD, trnV-ndhC, trnH-psbA, K2R-K707, atpB oligo2 – rbcL oligo5 and nuclear (ITS1) markers of four Eurasian and one American species (65 populations, 408 individuals). The data were evaluated with Maximum Parsimony and Bayesian analysis. Molecular dating and ancestral areas reconstruction were obtained. Key Results Dense sampling revealed widespread presence of shared haplotypes and ribotypes among Ledum populations and species. Two American, three Eurasian and one mixed lineage diversified during the Neogene climate cooling and then rapidly dispersed during the Pleistocene. The ability to accumulate high genetic diversity and to preserve it across distribution ranges and generations prevented Ledum from lineage sorting. As a result, a species complex with a reserve of genetic variability appeared. Conclusions Although no clear phylogenetic inference can be obtained at present, the plastid genealogy is consisted with the nuclear genealogy and demonstrates the processes involved in speciation in the Ledum species complex.

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Spatiotemporal niche overlap, asymmetric reproductive interference, and population genetics between the sympatric species, Rhododendron diversipilosum and Rhododendron subarcticum , in alpine fellfield habitat

Cited by 4 publications

References 52 publications

Variations in permafrost environments determine populations and leaf traits of two closely related common shrub species (Rhododendron subsect. Ledum) in Interior Alaska

Variations in permafrost environments determine populations and leaf traits of two closely related common shrub species (Rhododendron subsect. Ledum) in Interior Alaska

Permafrost conditions influence the abundance, distribution, and leaf traits of two closely related dominant shrub species (Rhododendron subsect. Ledum) in interior Alaska

Confusing boundaries of the Labrador tea species: dispersal history explains the lack of clear species structure

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