Show simple item record

dc.contributor.authorSumithran, Stephenen_US
dc.date.accessioned2014-03-14T21:23:52Z
dc.date.available2014-03-14T21:23:52Z
dc.date.issued1997-07-18en_US
dc.identifier.otheretd-62397-172421en_US
dc.identifier.urihttp://hdl.handle.net/10919/40511
dc.description.abstractThe Nilgiri tahr (Hemitragus hylocrius) is an endangered mountain ungulate endemic to the Western Ghats in South India. I studied the status and ecology of the Nilgiri tahr in the Mukurthi National Park, from January 1993 to December 1995. To determine the status of this tahr population, I conducted foot surveys, total counts, and a three-day census and estimated that this population contained about 150 tahr. Tahr were more numerous in the north sector than the south sector of the park. Age-specific mortality rates in this population were higher than in other tahr populations. I conducted deterministic computer simulations to determine the persistence of this population. I estimated that under current conditions, this population will persist for 22 years. When the adult mortality was reduced from 0.40 to 0.17, the modeled population persisted for more than 200 years. Tahr used grasslands that were close to cliffs (p <0.0001), far from roads (p <0.0001), far from shola forests (p <0.01), and far from commercial forestry plantations (p <0.001). Based on these criteria I mapped the suitability of tahr habitat using a GIS and estimated that only 20% of the park area had >50% chance of being used by tahr. I used the GIS to simulate several management options to improve the quality of tahr habitat. Suitable habitat for tahr increased two-fold when roads within the park were closed to vehicular access. Similarly, removal of commercial forestry plantations also resulted in a two-fold increase of suitable habitat, and finally when both road access was restricted and commercial forests were removed, suitable tahr habitat increased three-fold. I used micro-histological analysis on tahr fecal pellets to determine food habits. Grasses constituted 64.2% of their diet. Five plant species (Eulalia phaeothrix, Chrysopogon zeylanicus, Ischaemum rugosum, Andropogon sp., and Carex sp.) accounted for 84.6% of the tahr' diet. These species were found in higher densities in the grasslands of the north sector than the south sector of the park (p <0.001). Predators such as leopard (Panthera pardus) and tiger (Panthera tigris), killed and consumed tahr. Tahr constituted 56% of the leopards' diet and 6% of the tigers' diet. I estimated that leopards and tigers in the park killed and consumed 30 to 60 tahr per year, and this accounted for 19% to 38% of the tahr population. The tahr population in the park has undergone a decline, possible causes for this decline includes high mortality from predation and poaching and loss of habitat.en_US
dc.publisherVirginia Techen_US
dc.relation.haspartfinaltar.PDFen_US
dc.rightsI hereby grant to Virginia Tech or its agents the right to archive and to make available my thesis or dissertation in whole or in part in the University Libraries in all forms of media, now or hereafter known. I retain all proprietary rights, such as patent rights. I also retain the right to use in future works (such as articles or books) all or part of this thesis or dissertation.en_US
dc.subjectForage Preferenceen_US
dc.subjectHabitat Useen_US
dc.subjectWestern Ghatsen_US
dc.subjectIndiaen_US
dc.subjectNilgirisen_US
dc.subjectNilgiri tahren_US
dc.subjectGISen_US
dc.subjectPredatorsen_US
dc.titleStatus and Ecology of the Nilgiri Tahr in the Mukurthi National Park, South Indiaen_US
dc.typeDissertationen_US
dc.contributor.departmentFisheries and Wildlife Sciencesen_US
dc.description.degreePh. D.en_US
thesis.degree.namePh. D.en_US
thesis.degree.leveldoctoralen_US
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen_US
thesis.degree.disciplineFisheries and Wildlife Sciencesen_US
dc.contributor.committeechairFraser, James D.en_US
dc.contributor.committeememberStauffer, Dean F.en_US
dc.contributor.committeememberGiles, Robert H. Jr.en_US
dc.contributor.committeememberScanlon, Patrick F.en_US
dc.contributor.committeememberWynne, Randolph H.en_US
dc.contributor.committeememberMurphy, Brian R.en_US
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-62397-172421/en_US
dc.date.sdate1997-07-18en_US
dc.date.rdate1998-07-25
dc.date.adate1997-07-25en_US


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record