- Popular Article2014தவளைகள் பாடிய தாலாட்டு. (On Rainforest Frogs)தி இந்து நாளிதழ். The Hindu Tamil News Daily. 7th October 2014.
Jeganathan, P. (2014). தவளைகள் பாடிய தாலாட்டு -தி இந்து நாளிதழ் உயிர்மூச்சு இணைப்பில், ‘இயற்கையின் வாசலில்’ தொடர் எண் – 14. 7th October 2014. Thavalaigal Padiya Thalattu– Iyarkayin Vaasalil ArticleSeries No.14 (On Rainforest Frogs). The Hindu Tamil News Daily. 7th October 2014.
PDF, 2.69 MB
Hill Forests, Dewlaps, Dorsal Ridges, Tamil
- Poster2014Decomposition and Nutrient CyclingDownload
PDF, 3.73 MB
Beetles, Termites, Earthworms, Bacteria, Fungi, Tamil
- Journal Article2014Accounting for false positives improves estimates of occupancy from key informant interviewsDiversity and Distributions 20: 223-235Download
PDF, 443 KB
Much research in conservation biogeography is fundamentally dependent on obtaining reliable data on species distributions across space and time. Such data are now increasingly being generated using various types of public surveys. These data are often integrated with occupancy models to evaluate distributional patterns, range dynamics and conservation status of multiple species at broad spatio-temporal scales. Occupancy models have traditionally corrected for imperfect detection due to false negatives while implicitly assuming that false positives do not occur. However, public survey data are also prone to false-positive errors, which when unaccounted for can cause bias in occupancy estimates. We test whether false positives in a dataset collected from public surveys lead to overestimation of species site occupancy and whether estimators that simultaneously account for false-positive and false-negative errors improve occupancy estimates.
Western Ghats, India.
We fit occupancy models that simultaneously account for false positives and negatives to data collected from a large-scale key informant interview survey for 30 species of large vertebrates. We tested their performance against standard occupancy models that account only for false negatives.
Standard occupancy models that correct only for false negatives tended to overestimate species occupancy due to false-positive errors. Occupancy models that simultaneously accounted for false positives and negatives had greater support [lower Akaike's information criterion (AIC)] and, consistent with predictions, generated systematically lower occupancy estimates than standard models. Furthermore, accounting for false positives improved the accuracy of occupancy estimates despite the added complexity to the statistical estimator.
Integrating large-scale public surveys with occupancy modelling approaches is a powerful tool for informing conservation and management. However, in many if not most cases, it will be important to explicitly account for false positives to ensure the reliability of occupancy estimates obtained from public survey datasets such as key informant interviews, volunteer surveys, citizen science programmes, historical archives and acoustic surveys.
PDF, 2.25 MB
Colour Morphs, Forests, Grasslands, Chital, Barking Deer, Rodents, Domestic Livestock, Stray Dogs, Tamil
- Popular Article2014நிலம் யாருக்குச் சொந்தம்? (On Human-Elephant conflict mitigation measures and Valparai Elephant Project)தி இந்து நாளிதழ். The Hindu Tamil News Daily. 12th August 2014.
Jeganathan, P. (2014).நிலம்யாருக்குச்சொந்தம்? - திஇந்துநாளிதழ்உயிர்மூச்சுஇணைப்பில், ‘இயற்கையின்வாசலில்’தொடர்எண் – 6. 12th August 2014. Nilam Yarukku Sontham– Iyarkayin Vaasalil ArticleSeries No.6 (On Human-Elephant conflict mitigation measures and Valparai Elephant Project). The Hindu Tamil News Daily. 12th August 2014.
PDF, 17.7 MB
Lithe, Nimble, Palm Civets, Brown Palm Civet, Malabar Civet, Tamil
- Journal Article2014Genetic diversity and population structure of Lantana camara in India indicates multiple introductions and gene flow.Plant Biology. 16(3): 651-658.Download
PDF, 278 KB
Lantana camara is a highly invasive plant, which has spread over 60 countries and island groups of Asia, Africa and Australia. In India, it was introduced in the early nineteenth century, since when it has expanded and gradually established itself in almost every available ecosystem. We investigated the genetic diversity and population structure of this plant in India in order to understand its introduction, subsequent range expansion and gene flow. A total of 179 individuals were sequenced at three chloroplast loci and 218 individuals were genotyped for six nuclear microsatellites. Both chloroplasts (nine haplotypes) and microsatellites (83 alleles) showed high genetic diversity. Besides, each type of marker confirmed the presence of private polymorphism. We uncovered low to medium population structure in both markers, and found a faint signal of isolation by distance with microsatellites. Bayesian clustering analyses revealed multiple divergent genetic clusters. Taken together, these findings (i.e. high genetic diversity with private alleles and multiple genetic clusters) suggest that Lantana was introduced multiple times and gradually underwent spatial expansion with recurrent gene flow.
- Poster2014Dhole or Wild DogDownload
PDF, 6.92 MB
Coordinated Hunts, Sambar, Leopard, Chital, Tamil
- Book2014Nature Without BordersOrient Blackswan
Nature Without Borders explores the ways in which conservation of biodiversity can coexist with human actions and interests through a series of different essays. While wildlife conservation in India has traditionally depended on fencing off fragments of areas and habitats and guarding them against human encroachment, such an approach is limited in value, given that formally designated Protected Areas occupy a very small proportion of territory and that nature and natural processes transcend human boundaries and cannot be contained within the borders of nature reserves. Effective conservation, therefore, cannot ever depend on limiting or excluding human activity when habitats and environments themselves have porous boundaries.
Recent research, moreover, shows that effective conservation efforts can occur beyond the borders of Protected Areas and within human settlements. This eclectic collection of essays explores this more inclusive form of conservation through case studies that focus on different species, different environments (whether urban or rural), and different social and political constituencies from local farming or fishing communities to the educated middle class to corporate interests and the state. The essays range from overfishing along the Indian shoreline to the fate of the Gangetic river dolphin and from Sarus Cranes in the rice fields of Uttar Pradesh to the enigmatic snow leopard in the Himalayas. They explore the pastures of the Deccan plateau and the plantations of the Western Ghats as well as the lakes of Bengaluru and urban forests in Delhi. In sum, they offer readers insight into the scope of inclusive conservation that adapts its principles and practices to human activity across a diversity of environments and contexts.
This book will be of interests to students and scholars of ecology and environmental studies, environmental history and sociology. It will also be of interest to nature and conservation specialists and activists as well as policy makers and planners.
- Popular Article2014The HuntDeccan Herald Student Edition. Vol. 67 No 67, 8th March 2014.Download
PDF, 4.28 MB
Jeganathan, P. (2014). The Hunt. Deccan Herald Student Edition. Vol. 67 No 67, 8th March 2014.
- Popular Article2014At a crossroadsThe Hindu in School, 10 September
- Poster2014Malabar Spiny DoormouseDownload
PDF, 2.44 MB
Rodent, Nocturnal Species, Forage, Lianas, Tamil
- Poster2014Insects of the Western Ghats - Cricketssupported by Critical Ecosystem Partnership FundDownload
PDF, 25.7 MB
The Kudremukh Weta, Gryllacropsis, Crickets, Katydids, Tree Cricket, False Leaf Katydids, Onomarchus
- Journal Article2014Vigorous Dynamics Underlie a Stable Population of the Endangered Snow Leopard Panthera uncia in Tost Mountains, South Gobi, MongoliaPLoS One. DOI: 10.1371/journal.pone.0101319
- Book Chapter2014Nature Without Borders: An IntroductionPages 1-40 in Rangarajan, M., Madhusudan, M. D., & Shahabuddin, G. (eds.) Nature Without Borders. Orient Blackswan.
- Popular Article2014பஷீரின் குடுமிக் கழுகு. (On watching Legge’s Hawk Eagle Nest)தி இந்து நாளிதழ். The Hindu Tamil News Daily. 5th August 2014.
Jeganathan, P. (2014).பஷீரின் குடுமிக் கழுகு - தி இந்து நாளிதழ் உயிர்மூச்சு இணைப்பில், ‘இயற்கையின் வாசலில்’ தொடர்எண் – 5. 5th August 2014. Basheerin Kudumik Kazugu– Iyarkayin Vaasalil ArticleSeries No.5 (On watching Legge’s Hawk Eagle Nest). The Hindu Tamil News Daily. 5th August 2014.
- Popular Article2014Call of the birdsThe Hindu in School, 31 Dec
- Poster2014Tracking Tigers and LeopardsDownload
JPG, 570 KB
Tigers, Leopards, Pugmarks, Soil, Moisture, Claw Marks, Scats, Scrapes, Remains of Prey, Scent-marking
- Journal Article2014A case of colour aberration in Stripe-necked Mongoose Herpestes vitticollis in the Western Ghats, IndiaSmall Carnivore Conservation 50: 76-77.