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Research on the Spatial Distribution Pattern of the Rodents and Fleas Diversity in Farmland of Wild Rodent Plague in Yunnan Province

Author: LianHongYu
Tutor: GongZhengDa
School: Dali University
Course: Epidemiology and Biostatistics,
Keywords: Small mammal Flea Diversity Spatial distribution pattern Farmland Wild rodent plague foci
CLC: Q958
Type: Master's thesis
Year: 2010
Downloads: 18
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Abstract


Objective To investigate and study the spatial distribution pattern of the rodent and flea diversity in farmland of wild rodent plague in Yunnan Province, and learn the relationship among the spatial distribution pattern of the rodent and flea diversity and plague and environment. Methods This paper is based on investigation of fleas and small rodents in nine sample areas in three countries farmland ((include:Jianchuan, Lanping and Heqing) of wild rondent plague in northwest. And the field investigation data were accumulated and statistically analyzed in order to analyze and study the problems of diversities, spatial distribution patterns, and characteristics of rodents and fleas and the relationship of the geographical enviromental factors. Results (1) A total of 753 small mammals belonging to 21 species,11 genera and 5 families was collected. The dominant species were Apodemus chevrieri(accounting for 52.99%) and Eothenomys miletus(accounting for 20.32%); (2) A total of 478 individuals belonging to 18 species,12 genera and 3 families was collected. The dominant species were Neopsylla specialis specialis (accounting for 29.08%), Ctenophthalmus quadratus (accounting for 21.34%) and Frontopsylla spedix spadix (accounting for 20.92%); (3) There are definit relations among the diversities, species richness, evenness and ecological dominance of rodents and fleas; (4) Cody index of small mammals showed a distribution pattern of increaseed at first and then decreased with altitude increased. Sorense similarity coefficient (Sorense index) presented a bimodal distribution pattern with the increasing altitude increased. Species richness showed a distribution pattern of increased at first and then decreased along the altiudinal gradient too; (5) Cody index of fleas presented a bimodal distribution pattern along the altiudinal gradient. Sorense index showed a distribution pattern of increased at first and then decreased with altitude increased. Species richness presented a distribution pattern which increased first and then decreased with the increasing altitude; (6) Biomass and species of small mammals showed a very significantly positive correlation (r=0.894,P<0.01), but with the Shannon-Wiener index (species diversity) or density not related. Biomass of small mammals and species richness or Shannon-Wiener index were irrelevant; (7) Species richness of small mammals in three layers (include:the low heat layer, the warm layer, the cold layer) showed a distribution pattern of increased at first and then decreased, and the maximum peak is in the warm layer. But species richness of fleas showed a gradual upward trend, and the maximum peak is in the cold layer. Conclusion The diversity of rodents and fleas in farmland of wild rodent plague in Yunnan province showed a single distribution pattern with the increasing altitude, and the peak is located at about 2,000-2,900m. In this region, the high diversity of hosts and paraistic fleas benefits the long-term preservation of plague areas and the causes, conditions and mechanisms of the reduction of epidemic.

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CLC: > Biological Sciences > Zoology > Animal ecology and zoogeography
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