Contrasting Floristic Diversity of the Hengduan Mountains, the Himalayas and the Qinghai-Tibet Plateau Sensu Stricto in China

Frontiers in Ecology and Evolution, Год журнала: 2020, Номер 8

Опубликована: Май 15, 2020

The Qinghai-Tibet Plateau sensu lato (QTP s.l.) harbors an exceptionally high biodiversity, especially at its southeastern margin: this area encompasses the Hengduan Mountains and eastern Himalayas, which have been listed as biodiversity hotspots. To contrary, plateau interior (namely stricto, QTP s.s.) is relatively species-poor because of particularly harsh climate. With contrasting geological histories environmental conditions Mountains, Himalayas s.s., it would be expected that floristic compositions diversity patterns these three regions differ between each other. compare regions, we assembled data on seed plant's distribution in based county-level mapping from published monographs online databases, then analyzed their features species (horizontal elevational). We found hosted most plant (8,439), expected. highest percentage shrub (22.88%) tree (9.80%) were whereas herbaceous (81.50%) more prominent s.s.. also had species-rich genera (10) with than 50% total China. Also, temperate dominated across a (77.61%) within Across s.l., gradually decreased part to northwest, plants distributed southern margin East Himalayas. Along elevational gradients, richness all demonstrated hump-shape curve, but elevation zone differed for type life-form regions. Our study sets base exploring origin evolution mountain taxa, well provides snapshot current distribution, will certainly modified by climate change.

Язык: Английский

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Himalayan wolf distribution and admixture based on multiple genetic markers

Journal of Biogeography, Год журнала: 2020, Номер 47(6), С. 1272 - 1285

Опубликована: Фев. 19, 2020

Abstract Aim We explore the phylogeography of Himalayan wolves using multiple genetic markers applied on a landscape‐scale dataset and relate our findings to biogeographic history region. Location Himalayas Nepal, Tibetan Plateau China mountain ranges Central Asia. Taxon wolf (also called wolf), Canis lupus chanco . Methods present large‐scale, non‐invasive study from across their estimated range. analysed 280 scat samples western China, Kyrgyzstan Tajikistan at two mtDNA loci, 17 microsatellite four non‐synonymous SNPs in three nuclear genes related hypoxia pathway, ZF both sex chromosomes. Results Our results corroborate previous studies showing that forms distinct lineage adapted high altitudes excess 4,000 m elevation. found correlation between adaptation divergent haplotype Qinghai, Autonomous Region Nepalese Himalayas. identified region admixture grey boundary distributions, where elevation gradually drops. Main Conclusion Based markers, reciprocally monophyletic with unique altitude. propose divergence is past uplift region, maintains its high‐altitude niche, part, by means hypoxia. conclude merits taxonomic recognition designation as an evolutionary significant unit (ESU).

Язык: Английский

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Phylogeography of Liquidambar styraciflua (Altingiaceae) in Mesoamerica: survivors of a Neogene widespread temperate forest (or cloud forest) in North America?

Ecology and Evolution, Год журнала: 2014, Номер 4(4), С. 311 - 328

Опубликована: Янв. 10, 2014

We investigate the genetic variation between populations of American sweetgum (Liquidambar styraciflua), a tree species with disjunct distribution northeastern Texas and Mexico, by analyzing sequences two chloroplast DNA plastid regions in Mesoamerica. Our results revealed phylogeographical structure, private haplotypes distributed unique environmental space at either side Trans-Mexican Volcanic Belt, split absence gene flow dating back ca. 4.2-1.4 million years ago (MYA). Species modeling fit model refugia along Gulf Atlantic coasts but present ranges US Mesoamerican persisted during glacial/interglacial cycles. Divergence (ca. 8.4-2.8 MYA) L. styraciflua asymmetrical patterns support hypothesis long-distance dispersal Pliocene, fragmentation since most recent glacial advance (120,000 BP) according to coalescent simulations high effective migration rates from Mesoamerica USA close zero opposite direction. findings implicate Belt as porous barrier driving divergence styraciflua, corresponding niche differences, Pliocene Quaternary volcanic arc episode 3.6 MYA, origin USA.

Язык: Английский

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Contributions of historical and contemporary geographic and environmental factors to phylogeographic structure in a Tertiary relict species, Emmenopterys henryi (Rubiaceae)

Scientific Reports, Год журнала: 2016, Номер 6(1)

Опубликована: Май 3, 2016

Abstract Examining how historical and contemporary geographic environmental factors contribute to genetic divergence at different evolutionary scales is a central yet largely unexplored question in ecology evolution. Here, we examine this key by investigating across epochs have driven deeper (phylogeographic) shallower (landscape genetic) the Chinese Tertiary relict tree Emmenopterys henryi . We found that geography played predominant role all levels – phylogeographic clades are broadly geographically structured, deepest of associated with major geological or pre-Quaternary climatic events isolation distance (IBD) primarily explained population structure. However, clearly also important fluctuations since Last Interglacial (LIG) likely contributed structure (in our AFLP dataset) was partly environment (IBE), which may resulted from natural selection environments divergent climates. Thus, shaped patterns E. , and, fact, changes landscape through time been critical factors.

Язык: Английский

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Genetic diversity, genetic structure and demographic history of Cycas simplicipinna(Cycadaceae) assessed by DNA sequences and SSR markers

BMC Plant Biology, Год журнала: 2014, Номер 14(1)

Опубликована: Июль 12, 2014

Cycas simplicipinna (T. Smitinand) K. Hill. (Cycadaceae) is an endangered species in China. There were seven populations and 118 individuals that we could collect genotyped this study. Here, assessed the genetic diversity, structure demographic history of species. Analyses data DNA sequences (two maternally inherited intergenic spacers chloroplast, cpDNA one biparentally internal transcribed spacer region ITS4-ITS5, nrDNA) sixteen microsatellite loci (SSR) conducted Of samples, 86 from used for sequencing 115 six We found high diversity at level, low within each differentiation among populations. was a clear C. simplicipinna. A inferred indicates experienced recent population contraction without retreating to common refugium during last glacial period. The results derived SSR also showed underwent past effective contraction, likely Pleistocene. Some features such as having populations, provide guidelines protecting extinction. Furthermore, with dynamics our study would help insights other effectively.

Язык: Английский

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