The abstract of PhD dissertation in Biology: The study in ecology of the Indochinese silvered langur (Trachypithecus germaini Milne-Edwards, 1876) at the Chua Hang karst mountain, in Kien Kuong district, Kien Giang province

The main objective of this study was to characterize the ecology of the Indochinese silvered langur at the Chua Hang Karst Mountain. The findings from this study add important information needed for the conservation of the Indochinese silvered langur in Vietnam.
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The abstract of PhD dissertation in Biology: The study in ecology of the Indochinese silvered langur (Trachypithecus germaini Milne-Edwards, 1876) at the Chua Hang karst mountain, in Kien Kuong district, Kien Giang provinceMINISTRY OF EDUCATION VIETNAM ACADEMY AND TRAINING SCIENCE AND TECHNOLOGY GRADUATE UNIVERSITY OF SCIENCE AND TECHNOLOGY ----------------------------- LE HONG THIA THE STUDY IN ECOLOGY OF THE INDOCHINESESILVERED LANGUR (Trachypithecus germaini Milne-Edwards,1876) AT THE CHUA HANG KARST MOUNTAIN, IN KIEN LUONG DISTRICT, KIEN GIANG PROVINCE Area of specialization: Ecology Code: 9 42 01 20 THE ABSTRACT OF PHD DISSERTATION IN BIOLOGY Ho Chi Minh City –2019The dissertation was performed at Graduate University of Science andTechnology, Vietnam Academy Science and Technology.Supervisor 1: Professor, Dr. Herbert Hadley CovertSupervisor 2: Dr. Hoang Minh DucReviewer 1:Reviewer 2:Reviewer 3:The dissertation will be defended at the PhD dissertation committee ofGraduate University of Science and Technology, Vietnam AcademyScience and Technology at ………… on………, 20…….The dissertation was deposited at:- Library of Graduate University of Science and Technology- National Library of Vietnam 1 INTRODUCTION1. Justification of dissertationThe Indochinese silvered langur (Trachypithecus germaini) is one oftwelve colobine species found in Vietnam and its largest population isfound in the Kien Luong Karst area. The silvered langur has a smalldistribution range in the Mekong Delta. The previous studiesestimated that the total population size of this species in Vietnam isbetween 362 and 406 individuals, and the largest population comprises286 individuals in Kien Luong Karst Area of Kien Giang Province.The Indochinese silvered langur is listed as Endangered in the IUCN2013 - Redlist of Threatened Species as globally endangered A2cd.Under pressures from habitat destruction through limestoneexploitation in Hon Chong - Kien Luong area by cement companiesand the local community, the local government planned to translocatethe silvered langur population to other karst areas. However,ecological studies in this species, such as diet and feeding ecology, thechemistry of their eaten leaves, and the types of locomotions andsubstrates they utilized are virtually non-existent. In addition, the lackof information about the distribution and ecological characteristics forthis species prevent the ability to translocate and develop conservationstrategies. The conservation strategies for the silvered langur in theKien Luong area are difficult to perform without field studies, whichwill provide a good understanding of ecological such as habitat,distribution and feeding ecology. Additional information on feedingecology and group social structure should be studied to set up a basalunderstanding for selecting priority sites in Kien Luong area to supportexisting the silvered langur populations and propose immediateconservation measures. 22. The purpose of the studyThe main objective of this study was to characterize the ecology of theIndochinese silvered langur at the Chua Hang Karst Mountain. Thefindings from this study add important information needed for theconservation of the Indochinese silvered langur in Vietnam.3. The main contents of the study- Study on the status of the Indochines silvered langur population andhome range size at Chua Hang Karst Mountain.- Study on phenology and vegetation characterisations at the hibitatsof the Indochinese silvered langur.- Study on feeding ecology of the Indochinese silvered langur.- Suggest the solution for conservation the silvered langurs and thehabitats.4. The highlighs of dissertation- The dissertation presented the update data on the silvered langurpopulation size, the group organization, home ranges, and habitat use.- The dissertation indicated the vegetation characterisation and thehabitats of the silvered langurs at Chua Hang Karst Mountain.- The dissertation presented new data on activity budget of the silveredlangurs by days, months, year, and seasons.- The dissertation presented the data of the Indochinese silveredlangurs feeding ecology in the detail, for the fist time.- By using deep statistical analyze, the dissertation indicated therelationship between the plant food nutrition and food selection of theIndochinese silvered langur.- The dissertation showed the threats for the silvered langur populationwhich play an important role for the silvered langur conservation.5. Outline of Dissertation 3The dissertation consists of 131 pages and devided into 3 chapter with41 tables and 47 figures.The reference include 228, of which 33 areVietnamese references and 195 English references. The dissertationwas devided into chapters and sections as follows: Introduction (5pages), Chapter 1. Literature overview (22 pages), Chapter 2.Location, study period and methods (17 pages), Chapter 3. Results anddiscussion (84 pages), Conclusions and recommendations (4 pages),List of articles (1 page), References (14 pages), Appendix 36 pages. CHAPTER 1. LITERATURE OVERVIEW1.1. Introduction to the Indochinese silvered langurThe Indochinese silvered langur (Trachypithecus germaini) belongOld World monkeys (Cercopithecidae family), Colobinae subfamily,Trachypithecus genus. The general colour of the silvered langur issilvery grey. Forearms, hands and feet are black. Chin, throat, underparts of the body, and inner side of arms and legs sparsely coveredwith white hairs. Flanks are paler silvery grey than the upper parts.The tail is above bla ...