- Journal Article2012Socio-economic drivers of Forest Cover Change in Assam: A Historical PerspectiveEconomic and Political Weekly 47(5): 64-72Download
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This article analyses the historical context of forest cover change in the upper Brahmaputra Valley of Assam during the precolonial, colonial and the postcolonial periods, locating these changes within the political economy and demographic milieu of each regime.In the current context of rising populations linked to immigration from neighbouring regions, dwindling share of agriculture in the state’s gross domestic product, and recent incentives to small tea growers in risk-prone agricultural landscapes, serious challenges remain to securing forests in this region. Empowering local communities and institutions, understanding tea plantation dynamics and managing the causes and consequences of recent demographic change are crucial to the conservation of forests there.
- Journal Article2012Trends in extinction and persistence of diurnal primates in Upper Brahmaputra ValleyOryx 46(2): 308-311Download
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The historical deforestation of the Upper Brahmaputra Valley in the Indian state of Assam has resulted in the transformation of its once-contiguous lowland rainforests into many isolated forest fragments that are still rich in species, including primates. We report the recent history and current status of six diurnal primates in one large (2,098 ha) and three small (, 500 ha) fragments of the Upper Brahmaputra Valley. We censused primates in the small fragments during 2002, 2005, 2009, in the large fragment in 2008, and used other published census data to derive population trends. We also used key informant surveys to obtain historical occurrence data for these populations. Our analyses reveal the recent extinction of some populations and the simultaneous long-term persist- ence of others in these fragments over 16 years. Most populations appeared to have declined in the small fragments but primate abundance has increased signific- antly in the largest fragment over the last decade. Addressing the biomass needs of the local human populations, which appears to drive habitat degradation, and better protection of these forests, will be crucial in ensuring the future survival of this diverse and unique primate assemblage in the last rainforest fragments of the human-dominated Upper Brahmaputra Valley.
- Popular Article2012Dugongs, mermaids of the seaThe Hindu in School, 26 September
- Popular Article2012காப்பிநல்லதா?டீநல்லதா? (On best practices in sustainable agriculture of Coffee and Tea)புதிய தலைமுறை. 6 செப்டம்பர் 2012. Puthiya Thalaimurai. 6th September 2012.
காப்பிநல்லதா? டீநல்லதா?. காக்கைக்குருவிஎங்கள்ஜாதிதொடர்-9. புதியதலைமுறை. 6 செப்டம்பர் 2012.[Jeganathan, P. (2012).Kappi nallatha? Tea nallatha?. Kakkai Kuruvi Engal Jathi-Series, Article No.9. Puthiya Thalaimurai. 6th September 2012. (On best practices in sustainable agriculture of Coffee and Tea)]
- Popular Article2012தேசாந்திரியின்தோற்றப்பிழை. (On the impact of polarized light on Wandering Gliders)புதிய தலைமுறை. 23 ஆகஸ்டு 2012. Puthiya Thalaimurai. 23rd August 2012.
- Popular Article2012A home for the house sparrowThe Hindu in School, 18 April
Jeganathan, P. (2012). A home for the house sparrow. The Hindu in School, 18 April.
- Journal Article2012Averting biodiversity collapse in tropical forest protected areas.Nature 489: 290-294.
- Popular Article2012As the crow flies…The Hindu in School, 25 April
Jeganathan, P. (2012). As the crow flies… The Hindu in School, 25April.
- Journal Article2012Impact of vehicular traffic on large mammal use of highway-edges in southern IndiaCurrent Science 102(7): 1047-1051Download
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India’s phenomenal economic growth over the last decade has been accompanied by a much-needed expansion and improvement in transport and other infrastructure networks. While there are legally mandated assessments of the potential ecological impacts of such infrastructure projects prior to implementation, rarely are there post-implementation assessments of their real ecological impacts. In this communication, we present results of a preliminary study examining the impact of vehicular traffic on the usage of road edges by large mammals along a highway passing through Nagarahole Tiger Reserve, southern India. We estimated large mammal encounter rates at remotely triggered camera traps on two consecutive sections of the same highway – one closed to vehicular traffic and the other open to vehicles only during daytime. We observed lower encounter rates of chital, gaur and elephants at camera traps in the highway segment with higher vehicular traffic density, suggesting that these species avoided busy highways. Based on our findings, we emphasize the importance of continued ecological impact assessments of development projects to identify and mitigate unforeseen impacts. Further, an approach to development planning that integrates conservation concerns, especially where development projects coincide with ecologically critical areas, is urgently needed in India.
- Popular Article2012சின்னஞ்சிறுகுருவே…(On Ants)புதிய தலைமுறை. 26ஜூலை 2012. Puthiya Thalaimurai. 26th July 2012.
- Journal Article2011Patterns of spatiotemporal change in large mammal distribution and abundance in the southern Western Ghats, IndiaBiological Conservation 144: 1567-1576Download
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Large mammals face high risks of anthropogenic extinction owing to their larger body mass and associated life history traits. Recent worldwide mammal declines have highlighted the conservation importance of effective assessments of trends in distribution and abundance of species. Yet reliable data depicting the nature and extent of changes in population parameters is sparse, primarily due to logistical problems in covering large areas and difficulties in obtaining reliable information at large spatial scales, particularly over time. We used key informant surveys to generate detection histories for 18 species of large mammals (body mass > 2 kg) at two points in time (present and 30 years ago) in the Southern subregion of the Western Ghats global biodiversity hotspot. Multiple-season occupancy models were used to assess temporal trends in occupancy, detectability and vital rates of extinction and colonization for each species. Our results show significant declines in distribution for large carnivores, the Asian elephant and endemic ungulates and primates. There is a significant decline in detectability for 16 species, which suggests a decline in their abundance. These patterns of change in distribution and abundance repeat in our assessments of spatial variation in occupancy dynamics between the three contiguous forest complexes and two human-dominated landscapes into which the southern Western Ghats has been fragmented. Extinction rates are highest in the human-dominated landscapes. Declines in abundance for several species suggest the presence of extinction debts, which may soon be repaid with imminent range contractions and subsequent species extinctions unless immediate remedial conservation measures are taken. Detection/non-detection surveys of key informants used in an occupancy modeling framework provide potential for rapid conservation status assessments of multiple species across large spatial scales over time.
- Popular Article2011Habitat is the key.Down To Earth. October 1-15. Page 31.Download
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Jeganathan, P. (2011). Habitat is the key. Down To Earth. October 1-15. Page 31.
- Popular Article2011Roads, revetments and restorationBlog post at Reviving Rainforest
- Popular Article2011Bridging the canopy gapsBlog post at Reviving Rainforest
- Poster2011Some Birds Of The Nilgirissupported by Whitley Fund For NatureDownload
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Nilgiri Biosphere Reserve, Emerald Dove, Hill Myna, Indian Pitta, Jerdon's Nightjar, The Great Hornbill, Grey Wagtail, Black Eagle, Stork-billed Kingfisher, Blue-bearded Bee-eater, Spot-bellied Eagle Owl, Malabar Trogon
- Poster2011Vultures in Perilsupported by Whitley Fund For NatureDownload
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Long-billed Vultures, Red-headed Vulture, Egyptian Vulture, Diclofenac, Visceral Gout
- Popular Article2011Wild blames wildCare4NatureDownload
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Impact of dog on red fox
- Journal Article2011Farmland foods: Black-necked Stork Ephippiorhynchus asiaticus prey items in an agricultural landscapeForktail 27: 98-100
- Popular Article2011இளைய தலைமுறைக்கு மழைக்காட்டைப்பற்றிய தகவல்கள்http://hindi.mongabay.com/tamil/kids/
Rhett Butler (2006). Rain forest information for school kids. http://kids.mongabay.com/ In Tamil: by P. Jeganathan (2011). Ilaya thalaimuraiku Mazaikattai patriya Thagavalgal.
- Report2011Linking rural energy and nature conservation in a tribal village in Arunachal PradeshFinal Report submitted to DST, New Delhi, May 2011, 22 pp.