Abstract
Spatial and temporal trends of invasion by Ochlandra travancorica, a native reed bamboo species were studied. The study was carried out in Agasthyamalai Biosphere reserve, Western Ghats, India. Multi-temporal satellite images from 1973 to 2012 were utilized to map the areas of occurrence of the species. The largest areal extent of the species was calculated to be 111.65 km2 in the recent time, at which the invasion process reached its saturation phase. The species was found to be a generalist, with no preferred inclination towards any particular topographic or climatic zone. Evergreen forests were established to be its closest associate with largest area followed by semi evergreen and moist deciduous forests within buffer distances of 100, 200 and 500 m. A threatening 20.8 % of evergreen forests were revealed to have been converted to pure reed bamboos. Overlay analysis showed the oldest and the newest surviving patches of pure reed bamboos in the landscape of Agasthyamalai. The study realizes the significance of remote sensing and GIS in mapping and monitoring of invasive species. We suggest periodical monitoring of reed bamboo areas to check its growth, spread and establishment in order to ensure conservation of Western Ghats.
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Acknowledgments
The authors are thankful to Dr. V.K. Dadhwal, Director, NRSC, Hyderabad and Dr. C.S. Jha, Group Director, Forestry and Ecology Group, NRSC, Hyderabad for encouragement and facilities. The present work has been carried out a part of MoEF-NNRMS funded project entitled ‘Inventorisation and monitoring of biosphere reserves in India using remote sensing and GIS technology’. The authors are grateful to them for financial support and also thank Chief Wildlife Wardens and Field Directors, Agasthyamalai Biosphere Reserve and State Forest departments of Kerala and Tamil Nadu for permission and facilities to carry out the field work.
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Dutta, K., Reddy, C.S. Geospatial Analysis of Reed Bamboo (Ochlandra travancorica) Invasion in Western Ghats, India. J Indian Soc Remote Sens 44, 699–711 (2016). https://doi.org/10.1007/s12524-015-0534-5
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DOI: https://doi.org/10.1007/s12524-015-0534-5