- Poster2014Insects of the Western Ghats - Odonatessupported by Wildlife Ecosystem Partnership FundDownload
PDF, 279 MB
Odonata, Gnats, Midges, Nilgiri Bambootail, Travencore Torrent Dart, Stream Glory
- Poster2014Larval connectivity in Lakshadweep
PDF, 17.5 MB
Terrestrial, Insects, Crabs, Snakes, Birds, Stripe-necked Mongoose, Ruddy Mongoose, Brown Mongoose, Grey Mongoose, Tamil
- Popular Article2014The call of the indriFountain Ink, August 2014, 3(10): 37-51.
In Madagascar, island of endangered lemurs and shrinking forests, there is space for rapture and revival, too.
By T R Shankar Raman, Photos by Divya Mudappa and the author.
Available here: http://fountainink.in/?p=5687&all=1
- Poster2014Invertebrates of the Western Ghats - Spiderssupported by Critical Ecosystem Partnership FundDownload
PDF, 8.1 MB
Spiders, Spinnerets, Arachnura, Giant Wood Spiders
- Popular Article2014இலையில்லை, நாம் இல்லை. (On Leaves and why are young leaves are red)தி இந்து நாளிதழ். The Hindu Tamil News Daily. 21st October 2014.
Jeganathan, P. (2014). இலையில்லை, நாம் இல்லை - தி இந்து நாளிதழ் உயிர்மூச்சு இணைப்பில், ‘இயற்கையின் வாசலில்’ தொடர் எண் – 16. 21st October 2014. Ilaiyillai Namillai – Iyarkayin Vaasalil ArticleSeries No.16 (On Leaves and why are young leaves are red). The Hindu Tamil News Daily. 21st October 2014.
- Popular Article2014Marmot in mealsSAEVUSDownload
PDF, 451 KB
Talks about dog depredation in the snow leopard habitat.
- Poster2014Co-existing with Carnivoressupported by Eco-questDownload
JPG, 402 KB
Wild Prey, Carnivores, Deer, Livestock, Goats, Cows, Poisoned, Stoned, Beaten, Stressful
- Popular Article2014Survival of the fittestThe Hindu (Young World), 8 July
- 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.
- 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
- Popular Article2014சாப்பிடாமல்பறக்கும்வண்ணச்சித்திரங்கள். (On Moths)தி இந்து நாளிதழ். The Hindu Tamil News Daily.29th July 2014.
Jeganathan, P. (2014).சாப்பிடாமல்பறக்கும்வண்ணச்சித்திரங்கள் - திஇந்துநாளிதழ்உயிர்மூச்சுஇணைப்பில், ‘இயற்கையின்வாசலில்’தொடர்எண் – 4.29th July 2014. Saapidamal Parakkum Vanna Chithirangal– Iyarkayin Vaasalil ArticleSeries No.4 (On Moths). The Hindu Tamil News Daily. 29th July 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 Article2014How corals got their colourThe Hindu in School, 29 October
- Journal Article2014Bats in Indian coffee plantations: doing more good than harm?Current Science 107: 1958-1960.Download
PDF, 3.64 MB
Many bat species occur in Indian coffee plantations and despite sporadic reports of damage to commercial coffee crops, the literature shows little evidence for these claims. Measures that have been proposed to ‘control’ fruit bats are likely to be ineffective and even counter-productive. Instead, insect-eating bats should be encouraged by planters as they help control herbivorous and disease-carrying insects, while fruit bats pollinate flowers and disperse seeds of many useful plants and shade tree species. More research is needed to quantify any crop damage caused by bats and to look for sustainable solutions where necessary.
PDF also available here: http://www.currentscience.ac.in/Volumes/107/12/1958.pdf
- Popular Article2014வானில்200நாட்கள்பறந்தஅம்புகள்! (On Alpine Swift migration and Geolocators)தி இந்து நாளிதழ். The Hindu Tamil News Daily. 8th July 2014
Jeganathan, P. (2014). வானில் 200 நாட்கள்பறந்தஅம்புகள்! - திஇந்துநாளிதழ்உயிர்மூச்சுஇணைப்பில், ‘இயற்கையின்வாசலில்’தொடர்எண் – 1. 18th July 2014. Vaanil 200 Naatkal Parantha Ambugal! – Iyarkayin Vaasalil ArticleSeries No.1 (On Alpine Swift migration and Geolocators). The Hindu Tamil News Daily. 8th July 2014.