- Popular Article2013Development minus green shootsThe Hindu, 13 February 2013
By exempting some projects on forest land from gram sabha consent, the government has undermined the rights of local communities and their crucial role in protecting the environment.
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- Popular Article2013Ptero’s story as told by a Jack treeThe Hindu in School, 20 March
- Journal Article2013Spatial and temporal variation in hornbill densities in Namdapha Tiger Reserve, Arunachal Pradesh, north-east IndiaTropical Conservation Science 6:734-748Download
PDF, 642 KB
Asian hornbill populations are declining across their ranges because of hunting and deforestation. Five of the 32 Asian hornbill species occur in north-east India. However, vital information on their abundance from the region remains scanty. Understanding spatiotemporal variation in densities provides crucial information for formulating effective conservation strategies based on species-specific abundance patterns and population trends. We examined spatiotemporal variation in densities of four hornbill species in the Namdapha Tiger Reserve, a site identified as an important site for hornbill conservation in Asia. We collected data through variable-width line transect sampling (effort=842.1 km) in the non-breeding season from 2009-12 to estimate hornbill densities. We had 458 detections of four hornbill species. We have estimated White-throated Brown Hornbill densities (7.9 birds/km2) for the first time throughout its entire range. The mean Rufous-necked Hornbill densities (6.9 birds/km2) were higher than those reported elsewhere. Great (3.9 birds/km2) and Wreathed Hornbill (16.1 birds/km2) densities were comparable with other sites. The peak densities of all hornbill species in November-December are among the highest reported from Asia. Wreathed Hornbill densities showed temporal variation peaking in November-December (68 birds/km2) and drastically declining by March-April (1.3 birds/km2), indicating seasonal altitudinal movement to low elevation areas outside the reserve during the breeding season. Our results underscored the spatial variation in hornbill distribution, with low densities of Great and the White-throated Brown hornbills in higher elevations. Our study demonstrates the global importance of Namdapha for hornbills, given its large area and high densities of four hornbill species.
- Journal Article2013Antelope mating strategies facilitate invasion of grasslands by a woody weed.Oikos. 122(10): 1441-1452.Download
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Intra and interspecific variation in frugivore behaviour can have important consequences for seed dispersal outcomes. However, most information comes from among-species comparisons, and within-species variation is relatively poorly understood. We examined how large intraspecific differences in the behaviour of a native disperser, blackbuck antelope Antilope cervicapra, influence dispersal of a woody invasive, Prosopis juliflora, in a grassland ecosystem. Blackbuck disperse P. juliflora seeds through their dung. In lekking blackbuck populations, males defend clustered or dispersed mating territories. Territorial male movement is restricted, and within their territories males defecate on dung-piles. In contrast, mixed-sex herds range over large areas and do not create dung-piles. We expected territorial males to shape seed dispersal patterns, and seed deposition and seedling recruitment to be spatially localized. Territorial males had a disproportionately large influence on seed dispersal. Adult males removed twice as much fruit as females, and seed arrival was disproportionately high on territories. Also, because lek-territories are clustered, seed arrival was spatially highly concentrated. Seedling recruitment was also substantially higher on territories compared with random sites, indicating that the local concentration of seeds created by territorial males continued into high local recruitment of seedlings. Territorial male behaviour may, thus, result in a distinct spatial pattern of invasion of grasslands by the woody P. juliflora. An ex situ experiment showed no beneficial effect of dung and a negative effect of light on seed germination. We conclude that large intraspecific behavioural differences within frugivore populations can result in significant variation in their effectiveness as seed dispersers. Mating strategies in a disperser could shape seed dispersal, seedling recruitment and potentially plant distribution patterns. These mating strategies may aid in the spread of invasives, such as P. juliflora, which could, in turn, negatively influence the behaviour and ecology of native dispersers.
- Popular Article2013A day in the life of a butterfly fishThe Hindu in School, 10 July
- Journal Article2013Globalization of the Cashmere Market and the Decline of Large Mammals in Central AsiaConservation Biology 27, no. 4 (2013): 679-689
- Popular Article2013Jalebis at the forest fenceThe Hindu in School, 6 March
- Thesis2013Human-Carnivore Conflicts: understanding predation ecology and livestock damage by snow leopardsPhD thesis Submitted to Manipal University
- Popular Article2013Acrobats on waterThe Hindu in School, 13 February
Jeganathan, P. (2013). Acrobats on water. The Hindu. In school, 13th February.
- Book Chapter2013Arunachal macaque Macaca munzala (Sinha, Datta, Madhusudan and Mishra 2005)Pages 198-210 in A. J. T. Johnsingh & N. Manjrekar (editors) Mammals of South Asia – Volume 1. Universities Press, Hyderabad, India
- Book Chapter2013Anthropogenic Influences on Macaque Populations and Their Genetic ConsequencesPages 209 to 224 in S. Radhakrisna and A. Sinha (editors) The Macaque Connection: Cooperation and Conflict between Humans and Macaques, Springer, New Delhi.Download
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Human–macaque interactions constitute a complex phenomenon influencing perhaps the biology of the macaque more profoundly than ours. At the population level, humans tend to influence the distribution, demography, immunology and even behaviour of the macaque species they interact with though none of these interactions are ever simple. These works at different levels, interacting, in turn, with other environmental factors and most of these impacts are likely to have genetic consequences over the long term. In this chapter, we reviewed available literature on anthropogenic impacts on macaque populations. We should, however, stress that our current state of knowledge, unfortunately, suffers from a serious lack of insight into such genetic impacts. There is, therefore, a dire need for long-term genetic monitoring programmes to understand the effect of anthropogenic factors on the dispersal and demography of different macaque species.
- Popular Article2013My books and their animalsThe Hindi in School, 23 January
- Popular Article2013The great crane projectThe Hindu in School, 20 February
- Popular Article2013Bringing back a commonerThe Hindu in School, 27 February
- Popular Article2013Running into the rare brown mongooseThe Hindu in School, 27 March
- Popular Article2013Three different voicesThe Hindu in School, 17 July
- Popular Article2013All in a nameThe Hindu in School, 16 October
- Popular Article2013THE resurrectionThe Hindu in School, 23 October
- Book Chapter2013Dugongs in Asia. In Sirenian conservation: Issues and strategies in developing countries.Florida: University of Florida Press.
Ellen Hines. John Reynolds, Lemnuel Aragones, Antonio A. Mignucci- Giannoni, Miriam Marmontel. (Ed.)
- Poster2013Poster designed to carry out awareness programs regarding human-leopard conflictMarch 2013Download
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Leopard outreach activities are carried out based on the locations identified through conflict monitoring activity. This poster specifically designed to address conflict issues is distributed to communities to minimize anxiety and help in conflict reduction.