- 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.
- Popular Article2014தமிழகத்தின் சூழல் தொகுப்புகளும் வாழிடங்களும். (Ecosystems and Habitats of Tamil Nadu)மலையாள மனோரமா இயர்புக் தமிழ் – 2015. Manorama Year Book Tamil - 2015. December 2014. Pp. 178-195.
Jeganathan, P. (2014). தமிழகத்தின் சூழல் தொகுப்புகளும் வாழிடங்களும் - மலையாள மனோரமா இயர்புக் தமிழ் – 2015. December 2014. பக்கங்கள்-178-195.Thamilagathil Soozal Thoguppugalum, Vazidangalum (Ecosystems and Habitats of Tamil Nadu). Manorama Year Book Tamil - 2015. Malayala Manorama Press, Kottayam – 686 001. December 2014. Pp. 178-195.
- Report2014Ecology and conservation status of leopards in Bhadravathi Territorial DivisionOctober 2014Download
PDF, 15.6 MB
Despite the leopard (Panthera pardus) being a highly conflict-prone species with a wide distribution range, there are few population estimates of this species in Karnataka, especially outside protected areas. Effective conservation of this large carnivore and mitigation measures towards leopard conflict requires reliable estimates of population density in various habitats and landscapes with different management priorities. We conducted a population estimation exercise for the leopard using photographic capture-recapture analysis, using spatially explicit capture–recapture (SECR) models, in the multiple-use forests in Bhadravathi Division in central-interior Karnataka. Density estimates for leopards in this 370 km2 area, which includes 14 state, minor forests and sandal reserves, all continuous to each other, was found to be 11.1/100 km2 (95% CI 9.7-12.2/100 km2) with an estimated population size of 44 individuals (95% CI 39-49). We also recorded 14 species of large and small leopard prey from this area including gaur, sambar, chital, barking deer, four-horned antelope, wild pig and mouse deer. Using publicly available forest cover analyses tools, we estimate that the area has lost forest cover of ~14% since their notification between 1905 and 1941. We propose that the forest areas surveyed be declared as a wildlife sanctuary under the Wildlife Protection Act 1972 to uphold to their rich wildlife values.
- Popular Article2014உண்டி கொடுத்தோம், உயிர் கொடுத்தோமா? (On ill effects of feeding monkeys).தி இந்து நாளிதழ். The Hindu Tamil News Daily. 16th September 2014.
Jeganathan, P. (2014).உண்டி கொடுத்தோம், உயிர் கொடுத்தோமா? - தி இந்து நாளிதழ் உயிர்மூச்சு இணைப்பில், ‘இயற்கையின் வாசலில்’ தொடர்எண் – 11. 16th September 2014. Undi Koduthom Uyir Koduthoma?– Iyarkayin Vaasalil ArticleSeries No.11 (On ill effects of feeding monkeys). The Hindu Tamil News Daily. 16th September 2014.
- Popular Article2014ஓர் இன்பச் சுற்றுலாவும், அதற்குப் பிறகும். (On impact of mass tourism in hill stations and irresponsible tourists)தி இந்து நாளிதழ். The Hindu Tamil News Daily. 23rd September 2014.
Jeganathan, P. (2014). ஓர் இன்பச் சுற்றுலாவும், அதற்குப் பிறகும் - தி இந்து நாளிதழ் உயிர்மூச்சு இணைப்பில், ‘இயற்கையின் வாசலில்’ தொடர்எண் – 12. 23rd September 2014. Or Inba Sutrulavum Atharku Piragum– Iyarkayin Vaasalil ArticleSeries No.12 (On impact of mass tourism in hill stations and irresponsible tourists). The Hindu Tamil News Daily. 23rd September 2014.
- Journal Article2014The PREDICTS database: a global database of how local terrestrial biodiversity responds to human impactsEcology and Evolution, Volume 4, Issue 24 Pages: 4701–4735
Biodiversity continues to decline in the face of increasing anthropogenic pressures such as habitat destruction, exploitation, pollution and introduction of alien species. Existing global databases of species’ threat status or population time series are dominated by charismatic species. The collation of datasets with broad taxonomic and biogeographic extents, and that support computation of a range of biodiversity indicators, is necessary to enable better understanding of historical declines and to project – and avert – future declines. We describe and assess a new database of more than 1.6 million samples from 78 countries representing over 28,000 species, collated from existing spatial comparisons of local-scale biodiversity exposed to different intensities and types of anthropogenic pressures, from terrestrial sites around the world.
- Popular Article2013The great crane projectThe Hindu in School, 20 February
- Report2013Hornbills, rats, seeds and rainforest trees: plant-animal interactions and plant demographyFinal Report submitted to National Geographic Society, June 2013
- Book Chapter2013The Monkey in the Town’s Commons, Revisited: An Anthropogenic History of the Indian Bonnet MacaquePages 187-208 in S. Radhakrishna et al. (eds.), The Macaque Connection: Cooperation and Conflict between Humans and Macaques, Developments in Primatology: Progress and Prospects, Springer, New Delhi
- Popular Article2013Ptero’s story as told by a Jack treeThe Hindu in School, 20 March
- Journal Article2013Green turtle herbivory dominates the fate of seagrass primary production in the Lakshadweep islands (Indian Ocean)Marine Ecology Progress Series. 485:235-243
Historical global declines of megaherbivores from marine ecosystems have hitherto contributed to an understanding of seagrass meadow production dominated by detrital path- ways — a paradigm increasingly being questioned by recent re-evaluations of the importance of herbivory. Recoveries in green turtle populations at some locations provide an ideal opportunity to examine effects of high megaherbivore densities on the fate of seagrass production. We conducted direct field measurements of aboveground herbivory and shoot elongation rates in 9 seagrass meadows across 3 atolls in the Lakshadweep Archipelago (India) representing a gradient of green turtle densities. Across all meadows, green turtles consumed an average of 60% of the total leaf growth. As expected, herbivory rates were positively related to turtle density and ranged from being almost absent in meadows with few turtles, to potentially overgrazed meadows (ca. 170% of leaf growth) where turtles were abundant. Turtle herbivory also substantially reduced shoot elongation rates. Simulated grazing through clipping experiments confirmed this trend: growth rates rapidly declined to almost half in clipped plots relative to control plots. At green turtle den- sities similar to historical estimates, herbivory not only dominated the fate of seagrass primary pro- duction but also drastically reduced production rates in grazed meadows. Intensive turtle grazing and associated movement could also modify rates of detrital cycling, leaf export and local carbon burial, with important consequences for the entire seascape.
- Journal Article2013Phenology, seed dispersal and regeneration patterns of Horsfieldia kingii, a rare wild nutmegTropical Conservation Science, 6 (5): 674-689.Download
PDF, 1.3 MB
We present observational data on the flowering and fruiting patterns, seed dispersal, seedling recruitment and survival of a dioecious Myristicaceae species, Horsfieldia kingii, that occurs in the tropical forests of Arunachal Pradesh. Horsfieldia is rare (1 tree ha1) with a scattered distribution; Horsfieldia trees did not flower every year, and flowering was staggered from April to July. Peak ripe fruit availability of Horsfieldia is from February to March. Failure of fruiting occurred in most years, and only 0-33% of sampled trees bore ripe fruits. Initiation of hornbill breeding coincides with the ripe fruit availability of this species. The percentage of hornbill nests in which nesting is initiated each year varies from 50 to 100% of nests, and our results show a significant positive relationship between the percentage of hornbill nests that are active in a given year and the contribution of the species to hornbill diet (n = 6 years). However, the overall contribution to the breeding season diet of hornbills is very low because of poor fruit availability in most years, resulting in limited seed dispersal at nests. Recruitment and survival of Horsfieldia seedlings below parent trees and hornbill nest trees were low; however, seedling survival was marginally higher at nest trees, suggesting that dispersal by hornbills even in a spatially contagious manner may be critical for this species. However, current recruitment of Horsfieldia at hornbill nests (2010) is significantly lower than at parent trees. This species appears to be seed-limited, while dispersal limitation may play a secondary role in determining its abundance.
- Report2013Hornbill Nest Adoption Program - 2013 Breeding seasonHNAP Report for 2013Download
PDF, 1.78 MB
2013 Report for Hornbill Nest Adoption Program
- Popular Article2013Bringing back a commonerThe Hindu in School, 27 February
- Popular Article2013A day in the life of a butterfly fishThe Hindu in School, 10 July
- Popular Article2013Running into the rare brown mongooseThe Hindu in School, 27 March
- Popular Article2013Three different voicesThe Hindu in School, 17 July
- Journal Article2013Reversible immobilization of free-ranging snow leopards (Panthera uncia) using a combination of Medetomidine and Tiletamine-ZolazepamJournal of Wildlife Diseases DOI: 10.7589/2012-02-049
- Journal Article2013Large carnivores and low diversity of optimal prey: a comparison of the diets of snow leopards Panthera uncia and wolves Canis lupus in Sarychat-Ertash Reserve in KyrgyzstanOryx DOI:10.1017/S0030605313000306
- Journal Article2013Globalization of the Cashmere Market and the Decline of Large Mammals in Central AsiaConservation Biology 27: 679-689