- Book Chapter2014Nature Without Borders: An IntroductionPages 1-40 in Rangarajan, M., Madhusudan, M. D., & Shahabuddin, G. (eds.) Nature Without Borders. Orient Blackswan.
- Popular Article2014Perils of oil palmNewslink (Aizawl), 20 August 2014, page 2.
- Popular Article2014How corals got their colourThe Hindu in School, 29 October
- Poster2014In The RainforestDownload
PDF, 5.55 MB
Black Eagle, Scarlet Minivet, Indian Giant Squirrel, Great Hornbill, White-bellied Woodpecker, Pompadour Pigeon, White-bellied Blue Flycatcher, Butterfly, Lion-tailed Macaque, Bettle, Southern Green Calotes, Termites, King Cobra, Frog, Damselflies, Fungi, Malabar Whistling Thrush, Mouse Deer, Leopard Cat, Leaf-nosed Bat, Malabar Spiny Doormouse, Brown Palm Civet, Large Brown Flying Squirrel, Fruit Bat, Spot-bellied Eagle Owl
- Popular Article2014Marmot in mealsSAEVUSDownload
PDF, 451 KB
Talks about dog depredation in the snow leopard habitat.
- Popular Article2014Survival of the fittestThe Hindu (Young World), 8 July
PDF, 15.3 MB
Dollarbird, Chack-Chack, Flying Insects, Beetles, Lizards, Tamil
- 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.
- Journal Article2014Acoustic identification of bats in the southern Western Ghats, IndiaActa Chiropterologica 16: 213–222Download
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Bats play crucial roles in ecosystems, are increasingly used as bio-indicators and are an important component of tropical diversity. Ecological studies and conservation-oriented monitoring of bats in the tropics benefit from published libraries of echolocation calls, which are not readily available for many tropical ecosystems. Here, we present the echolocation calls of 15 species from the Valparai plateau in the Anamalai Hills, southern Western Ghats of India: three rhinolophids (Rhinolophus beddomei, R. rouxii (indorouxii), R. lepidus), one hipposiderid (Hipposideros pomona), nine vespertilionids (Barbastella leucomelas darjelingensis, Hesperoptenus tickelli, Miniopterus fuliginosus, M. pusillus, Myotis horsfieldii, M. montivagus, Pipistrellus ceylonicus, Scotophilus heathii, S. kuhlii), one pteropodid (Rousettus leschenaultii) and one megadermatid (Megaderma spasma). Discriminant function analyses using leave-one-out cross validation classified bats producing calls with a strong constant frequency (CF) component with 100% success and bats producing frequency modulated (FM) calls with 90% success. For five species, we report their echolocation calls for the first time, and we present call frequencies for some species that differ from those published from other parts of the species’ ranges. This exemplifies the need for more local call libraries from tropical regions to be collected and published in order to record endemic species and accurately identify species whose calls vary biogeographically.
PDF also available here: http://dx.doi.org/10.3161/150811014X683408
- 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.
- Report2014NCF Annual Report 2013 & 2014
- Popular Article2014Ants in my plants!The Hindu in School, 24 June
- Journal Article2014Occurrence of Small-toothed Palm Civet Arctogalidia trivirgata in Dampa Tiger Reserve, Mizoram, North-east IndiaSmall Carnivore Conservation 50: 47-49.Download
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Single Small-toothed Palm Civets Arctogalidia trivirgata were seen and photographed on two consecutive nights in March 2014 in Dampa Tiger Reserve, Mizoram, India. They visited a fruiting tree used also by Masked Palm Civet Paguma larvata and Common Palm Civet Paradoxurus hermaphroditus. The present note describes the observation, adding to the few recent records of A. trivirgata from North-east India. The sighting was close to the location of a 1995 sighting of Stripe-backed Weasel Mustela strigidorsa, another species rarely recorded in the region. We suggest further targeted spotlighting and camera-trap surveys for better documentation of the occurrence and distribution of small carnivores in Dampa.
- Journal Article2014Long-lived benthic predators require structurally stable reefs in the face of repeated climate-change disturbancesCoral Reefs. 33: 289-302
Benthic recovery from climate-related disturbances does not always warrant a commensurate functional recovery for reef-associated fish communities. Here, we examine the distribution of benthic groupers (family Serranidae) in coral reef communities from the Lakshadweep archipelago (Arabian Sea) in response to structural complexity and long-term habitat stability. These coral reefs that have been subject to two major El Nin ̃o Southern Oscillation-related coral bleaching events in the last decades (1998 and 2010). First, we employ a long-term (12-yr) benthic- monitoring dataset to track habitat structural stability at twelve reef sites in the archipelago. Structural stability of reefs was strongly driven by exposure to monsoon storms and depth, which made deeper and more sheltered reefs on the eastern aspect more stable than the more exposed (western) and shallower reefs. We surveyed groupers (species richness, abundance, biomass) in 60 sites across the entire archipelago, representing both exposures and depths. Sites were selected along a gradient of structural complexity from very low to high. Grouper biomass appeared to vary with habitat stability with significant differences between depth and exposure; sheltered deep reefs had a higher grouper biomass than either sheltered shallow or exposed (deep and shallow) reefs. Species richness and abundance showed similar (though not significant) trends. More interestingly, average grouper biomass increased exponentially with structural complexity, but only at the sheltered deep (high stability) sites, despite the availability of recovered structure at exposed deep and shallow sites (lower-stability sites). This trend was especially pronounced for long-lived groupers (life span [10 yrs). These results suggest that long-lived groupers may prefer temporally stable reefs, independent of the local availability of habitat structure. In reefs subject to repeated disturbances, the presence of structurally stable reefs may be critical as refuges for functionally important, long-lived species like groupers.
- Journal Article2014Accounting for false positives improves estimates of occupancy from key informant interviewsDiversity and Distributions 20: 223-235Download
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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.
- Popular Article2014பச்சைநிறமே,மரகதப்பச்சைநிறமே! (On Stream Glory Damselfly and streams of Western Ghats).தி இந்து நாளிதழ். The Hindu Tamil News Daily. 15th July 2014.
Jeganathan, P. (2014).பச்சைநிறமே, மரகதப்பச்சைநிறமே! - திஇந்துநாளிதழ்உயிர்மூச்சுஇணைப்பில், ‘இயற்கையின்வாசலில்’தொடர்எண் – 2. 15th July 2014. Pachai Nirame, Maragatha Pachai Nirame! – Iyarkayin Vaasalil ArticleSeries No.2 (On Stream Glory Damselfly and streams of Western Ghats). The Hindu Tamil News Daily. 15th July 2014. (The Hindu link here and personal blog link here).
- Popular Article2014From hunters to protectorsThe Hindu in School, 23 July
- Popular Article2014For the love of honeydewThe Hindu in School, 19 June
- Poster2014Tropical RainforestDownload
JPG, 1.09 MB
Trees, Woody Climbers(Lianas), Strangler Fig, Shrubs, Ferns, Herbaceous, Fungi, Lichens, Mosses, Soil Mites, Asian Elephants, Great Hornbill, Lion-tailed Macaques
- Journal Article2014Genetic diversity and population structure of Lantana camara in India indicates multiple introductions and gene flow.Plant Biology. 16(3): 651-658.Download
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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.