- Popular Article2012என் பக்கத்து வீட்டு பழுப்புக் கீச்சான் (My friendly neighborhood Brown Shrike)தினமணி நாளிதழ் – கொண்டாட்டம் இணைப்பில். 26 பிப்ரவரி 2012. Dinamani- Tamil Newspaper. Date: 26thFebruary.
என்பக்கத்துவீட்டுபழுப்புக்கீச்சான்.தினமணிநாளிதழ் – கொண்டாட்டம்இணைப்பில். 26 பிப்ரவரி 2012. [Jeganathan, P. (2012)En pakkathu veetu pazuppu keechan.Dinamani- Tamil Newspaper. Date: 26thFebruary. (My friendly neighborhood Brown Shrike)]
- Popular Article2012Hornbills: farmers of our forestsThe Hindu in School, 4 April
- 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 Article2012இடைவெளியும் இடையூறும் (Canopy gaps and obstacles: Canopy gaps above the forest roads and their impact on arboreal mammals of Western Ghats)Dinamani Tamil Newspaper. 29 January 2012.
இடைவெளியும் இடையூறும். தினமணி நாளிதழ் – கொண்டாட்டம் இணைப்பில். 29 ஜனவரி 2012. 3ம் பக்கம். [Jeganathan, P. (2012). Idaiveliyum Idayoorum. Dinamani- Tamil Newspaper. Date: 29th January (Canopy gaps and obstacles: Canopy gaps above the forest roads and their impact on arboreal mammals of Western Ghats) ]
Link for this article here.
- Popular Article2012காக்கா…காக்க...(On Crows)புதிய தலைமுறை. 12ஜூலை 2012 Puthiya Thalaimurai. 12th July 2012
- Popular Article2012சிட்டுக்குருவிகள் உண்மையிலேயே அழிந்து வருகின்றனவா? (Are House Sparrows really declining? and on citizensparrow results)தினமணி நாளிதழ் – கொண்டாட்டம் இணைப்பில். 22 ஏப்ரல் 2012. Dinamani – Tamil Newspaper. 22nd April 2012.
சிட்டுக் குருவிகள் உண்மையிலேயே அழிந்து வருகின்றனவா? தினமணி நாளிதழ் – கொண்டாட்டம் இணைப்பில். 22 ஏப்ரல் 2012.[Jeganathan, P. (2012). Sittukuruvigal unmayileye azinthu varukindranava? Dinamani – Tamil Newspaper. Date 22nd April 2012 (Are House Sparrows really declining? and on citizensparrow results)]
- Popular Article2012முந்தோன்றி மூத்தவரே. (On South Indian Primates)புதிய தலைமுறை. 16ஆகஸ்டு 2012. Puthiya Thalaimurai. 16th August 2012.
- Journal Article2012Optimizing individual identification and survey effort for photographic capture–recapture sampling of species with temporally variable morphological traitsAnimal Conservation 15(2): 174-183
Endangered, wide-ranging megafauna have many threats to contend with during their struggle for survival in an ever-increasing human dominance of the environment. Reliable monitoring of endangered large mammal populations is therefore a critical conservation requirement. Photographic capture–recapture (CR) techniques have opened up avenues for population monitoring of individually recognizable large mammal species. The efficient application of these techniques, however, can be constrained by challenges in reliably identifying individuals arising from the use of multiple, and potentially variable traits, as well as issues of temporal sampling of populations in the field. We address these key problems by describing an automated process of rapidly identifying individual Asian elephants (Elephas maximus) from photographs, and comparing resultant CR-based population parameter estimates with those obtained using supervised visual identification of individuals. In addition, we assess the temporal effort necessary for robust estimation of demographic parameters in our study population. Morphological traits that maintain constancy over time, including variations in tusk characteristics, and ear fold and lobe shape, proved the most reliable for individual identification and subsequent estimation of population parameters. The use of temporally variable traits contributed to high probabilities of misidentification and biased estimates of population size. We found a minimum of seven sampling occasions necessary for reliable population estimation. Our study contributes to design issues for CR studies by providing insights into optimality of sampling effort such that precision of parameter estimates are not compromised while minimizing survey costs. We demonstrate the importance of accurate individual identification in the context of such studies and recommend the use of fixed morphological traits as the optimal individual identification strategy for species where animals are distinguished on the basis of multiple attributes, including some that may be variable over time.
- Popular Article2012ஒரு மழைக்காட்டு விதையின் பயணம். (The Journey of a Rainforest seed)தினமணி நாளிதழ் – கொண்டாட்டம் இணைப்பில். 11 மார்ச் 2012. Dinamani- Tamil Newspaper. 11th March 2012.
ஒரு மழைக்காட்டு விதையின் பயணம். தினமணி நாளிதழ் – கொண்டாட்டம் இணைப்பில். 11 மார்ச் 2012. [Jeganathan, P. (2012).Oru Mazaikkatu vithaiyin payanam.Dinamani- Tamil Newspaper. Date: 11thMarch (The Journey of a Rainforest seed)]
- Popular Article2012A tree hole for a homeThe Hindu in School, 4 November
- 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.
- 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.
- Popular Article2012The pigeon's passengersThe Hindu in School, 9 May
- Popular Article2012Winter visitors from far awayThe Hindu in School, 16 October
- Popular Article2012Friendly fungiThe Hindu in School, 8 August
- Popular Article2012Why we need to protect bat speciesThe Hindu in School, 6 June
- Popular Article2012Attack of the killer fungusThe Hindu in School, 1 August
- Popular Article2012காட்டு நீரோடையின் மெல்லிசை மன்னன். (On Malabar Whistling Thrush)புதிய தலைமுறை. 2ஆகஸ்டு 2012 Puthiya Thalaimurai. 2nd August 2012
- Journal Article2011Less than wild? Commensal primates and wildlife conservationJournal of Biosciences 36: 749-753
- Popular Article2011Through democracy or by diktat? Creating inviolate areas for wildlife conservationThe Hindu Survey of the Environment 2011