Vegetation distribution pattern in the dam areas along middle-low reach of Lancang-Mekong River in Yunnan Province, China

From the 1870s to the 1940s, the construction of lineages among the Han settlers on the frontier between China's Yunnan province and Burma became significant. Through these lineages the construction of Han identity was also extended toward Burma along various transportation routes. In the continuing reformation of frontier society, gentry power, based on lineage corporations, expanded and performed a crucial role in the construction of a new style of border, as well as functioning as a leading force for ethnic competition by extending state power into the borderland. After the colonization of north Burma by the British in 1886, new economic opportunities attracted more Chinese merchants who built networks along transportation routes between cities in Burma and commercial centers in Yunnan, which also changed the social landscape of the frontier. The construction of lineages as a Han system not only overlapped with trade networks, but also provided sufficient economic and political resources to build a Han identity, which competed with other types of identity-polity systems – such as those of the Dai, the Lahu and the Wa – between the Mekong River and the Salween River.

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The effects of vegetation distribution pattern on overland flow

Water and Environment Journal ◽

10.1111/wej.12341 ◽

2018 ◽

Vol 32 (3) ◽

pp. 392-403 ◽

Cited By ~ 7

Author(s):

Shengtang Zhang ◽

Jingzhou Zhang ◽

Yuanchen Liu ◽

Ying Liu ◽

Zhikai Wang

Keyword(s):

Distribution Pattern ◽

Overland Flow ◽

Vegetation Distribution

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Multiple Domestication Centers Revealed by the Geographical Distribution of Chinese Native Pigs

Animals ◽

10.3390/ani9100709 ◽

2019 ◽

Vol 9 (10) ◽

pp. 709

Author(s):

Yuan Cai ◽

Jinqiang Quan ◽

Caixia Gao ◽

Qianyun Ge ◽

Ting Jiao ◽

...

Keyword(s):

River Basin ◽

Yangtze River ◽

Yunnan Province ◽

Mekong River ◽

Tibet Plateau ◽

The Yangtze River ◽

Mekong River Basin ◽

Surrounding Areas ◽

Qinghai Tibet Plateau ◽

Native Pigs

Previous studies have shown that Southeast Asian pigs were independently domesticated from local wild boars. However, the domestication of Chinese native pigs remains a subject of debate. In the present study, phylogenetic analysis of Chinese native pigs was performed by screening for haplotypes inferred from a phylogenetic tree of pig mitochondrial DNA (mtDNA) sequences based on sequence-specific mutations. A total of 2466 domestic pigs formed 124 haplotypes and were assigned to four clades. Clade A comprised pigs distributed mainly in the Qinghai-Tibet Plateau and its surrounding areas; these pigs clustered into three groups. The pigs of clade B were mainly from the Mekong River Basin in Yunnan Province and had been exposed to genetic infiltration from European populations. Clade C comprised pigs mainly from the middle and lower reaches of the Yangtze River. The pigs of clade D were distributed mainly at the intersection of Yunnan, Sichuan, and Gansu provinces east of the Hengduan Mountains (YSGH). Compared with wild boar, at least three domestication centers and one expansion center of pigs in China were detected. Among the four centers detected, two were for Tibetan pigs and were in the Qinghai-Tibet Plateau and at the YSGH intersection, and the other two were in the Mekong River Basin in Yunnan Province and the middle and downstream regions of the Yangtze River.

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Distribution and Host Selection of Tropical Rat Mite, Ornithonyssus bacoti, in Yunnan Province of Southwest China

Animals ◽

10.3390/ani11010110 ◽

2021 ◽

Vol 11 (1) ◽

pp. 110

Author(s):

Peng-Wu Yin ◽

Xian-Guo Guo ◽

Dao-Chao Jin ◽

Rong Fan ◽

Cheng-Fu Zhao ◽

...

Keyword(s):

Distribution Pattern ◽

Small Mammals ◽

Host Selection ◽

Yunnan Province ◽

Southwest China ◽

Environmental Gradients ◽

Gamasid Mite ◽

Ornithonyssus Bacoti ◽

Animal Hosts ◽

Selection Of

(1) Background: As a species of gamasid mite, the tropical rat mite (Ornithonyssus bacoti) is a common ectoparasite on rodents and some other small mammals. Besides stinging humans to cause dermatitis, O. bacoti can be a vector of rickettsia pox and a potential vector of hemorrhagic fever with renal syndrome (HFRS). (2) Objective: The present study was conducted to understand the host selection of O. bacoti on different animal hosts and the distribution in different environmental gradients in Yunnan Province of Southwest China. (3) Methods: The original data came from the investigations in 39 counties of Yunnan, between 1990 and 2015. The animal hosts, rodents and some other small mammals were mainly trapped with mouse traps. The O. bacoti mites on the body surface of animal hosts were collected and identified in a conventional way. The constituent ratio (Cr), prevalence (PM), mean abundance (MA) and mean intensity (MI) were used to reflect infestations of animal hosts with O. bacoti mites. The patchiness index and Taylor’s power law were used to measure the spatial distribution pattern of O. bacoti mites on their hosts. (4) Results: A total of 4121 tropical rat mites (O. bacoti) were identified from 15 species and 14,739 individuals of hosts, and 99.20% of them were found on rodents. More than half of O. bacoti mites (51.78%) were identified from the Asian house rat (Rattus tanezumi), and 40.09% of the mites from the Norway rat (R. norvegicus) (p < 0.05). The infestations of R. tanezumi (PM = 7.61%, MA = 0.40 and MI = 5.31) and R. norvegicus (PM = 10.98, MA = 1.14 and MI = 10.39) with O. bacoti mites were significantly higher than those of other host species (p < 0.05). The infestations of two dominant rat hosts (R. tanezumi and R. norvegicus) with O. bacoti mites varied in different environmental gradients (latitudes, longitudes, altitudes, landscapes and habitats) and on different sexes and ages of the hosts. The prevalence of juvenile R. norvegicus rats with O. bacoti mites (PM = 12.90%) was significantly higher than that of adult rats (PM = 9.62%) (p < 0.05). The prevalence (PM = 38.46%) and mean abundance (MA = 2.28 mites/host) of R. tanezumi rats with O. bacoti mites in the high latitude were higher than those in the low latitudes (p < 0.05). The majority of the total collected 4121 O. bacoti mites was found in the flatland landscape (91.28%) and indoor habitat (73.48%) (p < 0.05). The PM (10.66%) and MA (0.49 mites/host) of R. tanezumi rats with O. bacoti mites were significantly higher in the indoor habitat than in the outdoor habitat (p < 0.05). The tropical rat mites showed an aggregated distribution pattern on their first dominant host, R. tanezumi. Conclusion: The tropical rat mite (O. bacoti) is a widely distributed species of gamasid mite in Yunnan Province, Southwest China, and its dominant hosts are two synanthropic species of rats, R. tanezumi and R. norvegicus. It is mainly distributed in the flatland landscape and indoor habitat. It has some host-specificity, with a preference to rodents, especially R. tanezumi and R. norvegicus. The O. bacoti mites are of aggregated distribution on R. tanezumi rats.

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