- Popular Article2016Managing man’s best friend in a Trans-Himalayan landscapeFeature in Current Conservation, Issue 10.1
- Popular Article2015A range of faunaFrontline, January 9, 2015 Pages: 67-82Download
PDF, 2.77 MB
An account of a trek in Sathyamangalam Tiger Reserve, Tamil Nadu.
- Popular Article2015Little Green Flesh-eatersThe Hindu in School, 21 January
- Popular Article2015Natural history on the rocksSaevus, January issueDownload
PDF, 5.74 MB
Connecting rock art in the Trans-Himalayan Spiti Valley with natural history.
- Popular Article2015Marine Meadows – Following The Feeding Trail Of The DugongSanctuary Asia, Vol. XXXV No. 1, February 2015.
- Book Chapter2015SciuridsIn: Mammals of South Asia: Volume 2, (eds A. J. T. Johnsingh & N. Manjrekar), pp. 513-573. Universities Press, Hyderabad.
- Journal Article2015Seed dispersal by avian frugivores: non-random heterogeneity at fine scales.Biotropica 47(1): 77-84.Download
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Seed dispersal studies have primarily examined dispersal as a function of distance from the parent tree and/or heterogeneity in dispersal due to animal use of nesting, roosting and sleeping sites. However, non-random heterogeneity in seed dispersal is also likely to result from the post-foraging behavior and movement of frugivores which prefer certain trees. To characterize variation in seed rain at fine scales, we studied the dispersal curve of Prunus ceylanica, a primarily bird-dispersed species. We compared seed rain at conspecifics, heterospecific fruiting trees with similar frugivore assemblages, emergent trees, and the landscape surrounding these trees. Seed rain of P. ceylanica was found to peak globally under the canopy of conspecifics but to peak locally under the canopy and immediate neighborhood of heterospecific fruiting trees. Our results demonstrate that seed rain is highly clumped even at fine spatial scales. A large proportion of seeds are dispersed in specific, localized regions. This variation can have important implications for plant population dynamics and might significantly alter the impact of post-dispersal processes. Seed dispersal models may need to incorporate this heterogeneity to explain manifestations of spatially explicit dynamics like mixed species ‘orchards’.
- Popular Article2015Message in a pollenThe Hindu in School, 1 April
- Popular Article2015Nono: king of the mountainsThe Hindu in School, 18 March
- Popular Article2015Hornbill hills: the hunterThe Hindu in School, 25 Feb
- Popular Article2015Hornbill hills: the protectorThe Hindu in School, 4 March
- Popular Article2015Balcony birdingThe Hindu in School, 4 Feb
- Popular Article2015Smelly StorkThe Hindu in School, 15 April
- Popular Article2015A crown in the flowerThe Hindu in School, 28 April
- Journal Article2015Reduced hornbill abundance associated with low seed arrival and altered recruitment in a hunted and logged tropical forestPLOSOne; DOI: 10.1371/journal.pone.0120062
Logging and hunting are two key direct threats to the survival of wildlife in the tropics, and also disrupt important ecosystem processes. We investigated the impacts of these two factors on the different stages of the seed dispersal cycle, including abundance of plants and their dispersers and dispersal of seeds and recruitment, in a tropical forest in north-east India. We focused on hornbills, which are important seed dispersers in these forests, and their food tree species. We compared abundances of hornbill food tree species in a site with high logging and hunting pressures (heavily disturbed) with a site that had no logging and relatively low levels of hunting (less disturbed) to understand logging impacts on hornbill food tree abundance. We compared hornbill abundances across these two sites. We, then, compared the scatter-dispersed seed arrival of five large-seeded tree species and the recruitment of four of those species. Abundances of hornbill food trees that are preferentially targeted by logging were two times higher in the less disturbed site as compared to the heavily disturbed site while that of hornbills was 22 times higher. The arrival of scatter-dispersed seeds was seven times higher in the less disturbed site. Abundances of recruits of two tree species were significantly higher in the less disturbed site. For another species, abundances of younger recruits were significantly lower while that of older recruits were higher in the heavily disturbed site. Our findings suggest that logging reduces food plant abundance for an important frugivore-seed disperser group, while hunting diminishes disperser abundances, with an associated reduction in seed arrival and altered recruitment of animal-dispersed tree species in the disturbed site. Based on our results, we present a conceptual model depicting the relationships and pathways between vertebrate-dispersed trees, their dispersers, and the impacts of hunting and logging on these pathways.
- Journal Article2015Diet and foraging behaviour of Purple Cochoa Cochoa purpurea in Namdapha National Park, IndiaForktail, 30, 145-147
- Journal Article2015Status of the mountain ungulate prey of the Endangered snow leopard Panthera uncia in the Tost Local Protected Area, South Gobi, MongoliaOryx, doi:10.1017/S0030605314001203
- Popular Article2015Life of fryThe Hindu in School, 3 June
- Popular Article2015Survival tips to a young fish from an old fishThe Hindu in School, 10 June
- Popular Article2015How I wish I was a fish!The Hindu in School, 1 July