- 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.
- Journal Article2014Acoustic identification of bats in the southern Western Ghats, IndiaActa Chiropterologica 16: 213–222Download
PDF, 347 KB
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
- Poster2014Introduction to the Western Ghatssupported by Critical Ecosystem Partnership FundDownload
PDF, 14.9 MB
Endemics, Malabar Grey Hornbill, Vertebrates, Intervertebrates, Deciduous Forests, Tropical Rainforests, Shola Grasslands
PDF, 32.2 MB
Two-headed Snake, Earthworms, Insect Larvae, Flattened Tail, Tamil
- Book Chapter2014Fostering human-elephant coexistence in the Valparai landscape,Anamalai Tiger Reserve, Tamil NaduPages 14 - 26, in Human-Wildlife Conflict in the Mountains of SAARC Region - Compilation of Successful Management Strategies and Practices. SAARC Forestry Centre, Thimpu, Bhutan.
- Popular Article2014மக்கள் விஞ்ஞானிகளே, வாருங்கள்! (On various citizen science project initiatives in India)25th November 2014.
Jeganathan, P. (2014). மக்கள் விஞ்ஞானிகளே, வாருங்கள்! - தி இந்து நாளிதழ் உயிர்மூச்சு இணைப்பில், ‘இயற்கையின் வாசலில்’ தொடர் எண் – 21. 25th November 2014. Makkal Vingnanigale Varungal!– Iyarkayin Vaasalil ArticleSeries No.21 (On various citizen science project initiatives in India). The Hindu Tamil News Daily. 25th November 2014.
- Journal Article2014Multi-scale factors influencing human attitudes towards snow leopards and wolves.Conservation Biology DOI: 10.1111/cobi.12320
- 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
PDF, 5.91 MB
Black and Orange Flycatcher, Nilgiri Flycatcher, Brown-breasted Flycatcher, Asian Paradise-Flycatcher, Rusty-tailed Flycatcher, Grey-headed Canary Flycatcher, Tamil
- Poster2014Geckos and SkinksDownload
PDF, 14.6 MB
Beddome's Grass Skink, Anamalai Gecko, Forest Day Gecko, Kollegal Ground Gecko, Dussumier's Litter Skink, Side-spotted Ground Skink, Tamil
- Popular Article2014How green is your tea?Blink: The Hindu Business Line, 27 September 2014, pages 10-11.Download
PDF, 1.41 MB
- Poster2014King CobraDownload
PDF, 10.3 MB
Snakes, Tropical Moist Forests, Monitor Lizards, Other Snakes, Tamil
- Popular Article2014Call of the birdsThe Hindu in School, 31 Dec
- 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 Article2014அற்புதங்களுக்குப் பின் ஒளிந்திருக்கும் ‘செட்டப்'. (On irresponsible and unethical nature photography)தி இந்து நாளிதழ். The Hindu Tamil News Daily. 11th November 2014.
Jeganathan, P. (2014).அற்புதங்களுக்குப் பின் ஒளிந்திருக்கும் ‘செட்டப்' - தி இந்து நாளிதழ் உயிர்மூச்சு இணைப்பில், ‘இயற்கையின் வாசலில்’ தொடர் எண் – 19. 11th November 2014. Arputhangaluku pin olinthirukum setup– Iyarkayin Vaasalil ArticleSeries No.19 (On irresponsible and unethical nature photography). The Hindu Tamil News Daily. 11th November 2014.
- Journal Article2014Local and Landscape Correlates of Primate Distribution and Extinction in Upper Brahmaputra ValleyConservation Biology 28(1): 95-106Download
PDF, 807 KB
Habitat fragmentation affects species distribution and abundance, and drives extinctions. Es- calated tropical deforestation and fragmentation have confined many species populations to habitat rem- nants. How worthwhile is it to invest scarce resources in conserving habitat remnants within densely settled production landscapes? Are these fragments fated to lose species anyway? If not, do other ecologi- cal, anthropogenic, and species-related factors mitigate the effect of fragmentation and offer conservation opportunities? We evaluated, using generalized linear models in an information-theoretic framework, the effect of local- and landscape-scale factors on the richness, abundance, distribution, and local extinction of 6 primate species in 42 lowland tropical rainforest fragments of the Upper Brahmaputra Valley, northeastern India. On average, the forest fragments lost at least one species in the last 30 years but retained half their original species complement. Species richness declined as proportion of habitat lost increased but was not significantly affected by fragment size and isolation. The occurrence of western hoolock gibbon (Hoolock hoolock) and capped langur (Trachypithecus pileatus) in fragments was inversely related to their isolation and loss of habitat, respectively. Fragment area determined stump-tailed (Macaca arctoides) and northern pig-tailed macaque occurrence (Macaca leonina). Assamese macaque (Macaca assamensis) distribution was affected negatively by illegal tree felling, and rhesus macaque (Macaca mulatta) abundance increased as habitat heterogeneity increased. Primate extinction in a fragment was primarily governed by the extent of divergence in its food tree species richness from that in contiguous forests. We suggest the conservation value of these fragments is high because collectively they retained the entire original species pool and individually retained half of it, even a century after fragmentation. Given the extensive habitat and species loss, however, these fragments urgently require protection and active ecological restoration to sustain this rich primate assemblage.
- Poster2014Mammals of the Western Ghatssupported by Critical Ecosystem Partnership FundDownload
PDF, 97.2 MB
Bats, Fruit Bat(Latidens Salimalii), Vermin, Barbastella Leucomelas
- Poster2014Decomposition and Nutrient CyclingDownload
PDF, 3.73 MB
Beetles, Termites, Earthworms, Bacteria, Fungi, Tamil
- Poster2014Endemic BirdsDownload
PDF, 13.5 MB
White-bellied Shortwing, White-bellied Treepie, Rufous Babbler, Nilgiri Pipit, Malabar Grey Hornbill, Black and Orange Flycatcher, Grey-breasted Laughing Thrush, Broad-tailed Grassbird, Malabar Crested Lark, Malabar Parakeet, Tamil
- Popular Article2014நீங்களும் விஞ்ஞானிதான்! (On Citizen Science)தி இந்து நாளிதழ். The Hindu Tamil News Daily. 18th November 2014.
Jeganathan, P. (2014).நீங்களும் விஞ்ஞானிதான்! - தி இந்து நாளிதழ் உயிர்மூச்சு இணைப்பில், ‘இயற்கையின் வாசலில்’ தொடர் எண் – 20. 18th November 2014. Neengalum vingnanithan– Iyarkayin Vaasalil ArticleSeries No.20 (On Citizen Science). The Hindu Tamil News Daily. 18th November 2014.