- Journal Article2011Patterns of spatiotemporal change in large mammal distribution and abundance in the southern Western Ghats, IndiaBiological Conservation 144: 1567-1576Download
PDF, 661 KB
Large mammals face high risks of anthropogenic extinction owing to their larger body mass and associated life history traits. Recent worldwide mammal declines have highlighted the conservation importance of effective assessments of trends in distribution and abundance of species. Yet reliable data depicting the nature and extent of changes in population parameters is sparse, primarily due to logistical problems in covering large areas and difficulties in obtaining reliable information at large spatial scales, particularly over time. We used key informant surveys to generate detection histories for 18 species of large mammals (body mass > 2 kg) at two points in time (present and 30 years ago) in the Southern subregion of the Western Ghats global biodiversity hotspot. Multiple-season occupancy models were used to assess temporal trends in occupancy, detectability and vital rates of extinction and colonization for each species. Our results show significant declines in distribution for large carnivores, the Asian elephant and endemic ungulates and primates. There is a significant decline in detectability for 16 species, which suggests a decline in their abundance. These patterns of change in distribution and abundance repeat in our assessments of spatial variation in occupancy dynamics between the three contiguous forest complexes and two human-dominated landscapes into which the southern Western Ghats has been fragmented. Extinction rates are highest in the human-dominated landscapes. Declines in abundance for several species suggest the presence of extinction debts, which may soon be repaid with imminent range contractions and subsequent species extinctions unless immediate remedial conservation measures are taken. Detection/non-detection surveys of key informants used in an occupancy modeling framework provide potential for rapid conservation status assessments of multiple species across large spatial scales over time.
- Report2011Long-term hornbill nest and roost monitoring in Pakke Wildlife Sanctuary and Tiger Reserve (2003-2010).Unpublished Report. Submitted to Arunachal Pradesh Forest Department, Itanagar, Arunachal Pradesh, November 2011.
- Popular Article2011Conserving the tiger needs putting people firstTimes of India, 4 March 2011
- Popular Article2011Through democracy or by diktat? Creating inviolate areas for wildlife conservationThe Hindu Survey of the Environment 2011
- Journal Article2011Less than wild? Commensal primates and wildlife conservationJournal of Biosciences 36: 749-753
- Popular Article2011Trumpeting their causeThe Hindu Young World. 19th July.
Jeganathan, P. (2011). Trumpeting their cause. The Hindu Young World. 19th July. http://www.thehindu.com/life-and-style/kids/article2237914.ece
- Popular Article2011Staying legal, staying reasonableDown To Earth, 15 November 2011
Full article accessible here
- Popular Article2011Remembering Charles Darwin.The Hindu Young World. 15th February.
Jeganathan, P. (2011). Remembering Charles Darwin. The Hindu Young World. 15th February.
- Popular Article2010Watching dragons and damselsCare4Nature. June. Pp 12-15. http://emagazine.care4nature.org/emagazine-june/index.htmlDownload
PDF, 962 KB
Jeganathan, P. (2010). Watching dragons and damsels. Care4Nature. June. Pp 12-15. http://emagazine.care4nature.org/emagazine-june/index.html
- Popular Article2010Watching dragons and damselsThe Hindu Young World, 6th July. http://www.hindu.com/yw/2010/07/06/stories/2010070660120200.htm
Jeganathan, P. (2010). Watching dragons and damsels. The Hindu Young World, 6th July. http://www.hindu.com/yw/2010/07/06/stories/2010070660120200.htm
- Journal Article2010Multi-spatial co-distribution of the endangered Ladakh urial and blue sheep in the arid Trans-Himalayan mountains.Journal of Arid Environments, 74 : 1162–1169.
- Book Review2010Culled from Nature – Book Review of Sprint of the Blackbuck.The Hindu Literary Review. 5th September. http://www.hindu.com/lr/2010/09/05/stories/2010090550080300.htm
Jeganathan, P. (2010). Culled from Nature – Book Review of Sprint of the Blackbuck. The Hindu Literary Review. 5th September. http://www.hindu.com/lr/2010/09/05/stories/2010090550080300.htm
- Popular Article2010The Journey of a Rainforest seedCare4Nature.January.Pp24-29. http://emagazine.care4nature.org/emagazine-jan2011/index.htmlDownload
PDF, 2.35 MB
Jeganathan, P & Swati, S. (2010). The Journey of a Rainforest seed. Care4Nature.January.Pp24-29. http://emagazine.care4nature.org/emagazine-jan2011/index.html
- Book Chapter2010Snow leopards: conflict and conservation.Biology and Conservation of Wild Felids, pp. 417-430.
- Popular Article2010Ecotourist, tread carefully!Deccan Herald, 11 May 2010
- Popular Article2010Change the hunterTimes of India, 30 April 2010
- Journal Article2010Seeing the elephant in the room: human elephant conflict and the Elephant Task Force reportEconomic and Political Weekly 45(49): 29-31Download
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The report of the Elephant Task Force acknowledges the gravityof human-elephant conflicts,and makes a set of potentially far-reaching and forward-looking suggestions to alleviate them. The spirit of most of them is admirable and positive, but the devil, as always, is in the implementation. Managing conflict is as much about protecting farmers and farmlands from elephants as it is about reducing our footprint on the elephant’s domain. The first of five articles that discuss the Elephant Task Force report.
- Journal Article2010Genetic Polymorphism in the Serotonin Transporter Promoter Region and Ecological Success in MacaquesBehaviour Genetics, 40: 672-679Download
PDF, 404 KB
A well-characterised sequence length poly- morphism in the serotonin transporter promoter region (5-HTTLPR) influences individual behavioural traits and cognitive abilities in humans and rhesus macaques. Maca- ques have been classified into four continuous grades on the basis of their behavioural attributes, ranging from highly hierarchical and nepotistic species to the most egalitarian and tolerant ones. A comparative study of several species that spanned these grades revealed only rhesus macaques to be polymorphic at the 5-HTTLPR and concluded that the polymorphism was responsible for their despotic and aggressive behaviour (Wendland et al., Behav Genet 36:163–172, 2006). We studied wild populations of three other species and found that the egalitarian and tolerant bonnet and Arunachal macaques are also polymorphic while liontailed macaques, although belonging to the same group, are monomorphic. We thus reject a role for this particular polymorphism in interspecific behavioural vari- ability and show that polymorphic species enjoy greater ecological success possibly due to their higher infraspecific variability in individual behavioural traits.
- Journal Article2010From Bathymetry to Bioshields: A review of post-tsunami ecological research in India and its implications for policyEnvironmental Management 46:329-338
More than half a decade has passed since the December 26th 2004 tsunami hit the Indian coast leaving a trail of ecological, economic and human destruction in its wake. We reviewed the coastal ecological research carried out in India in the light of the tsunami. In addition, we also briefly reviewed the ecological research in other tsunami affected countries in Asia namely Sri Lanka, Indonesia, Thailand and Maldives in order to provide a broader perspective of ecological research after tsunami. A basic search in ISI Web of Knowledge using keywords ‘‘tsunami’’ and ‘‘India’’ resulted in 127 peer reviewed journal articles, of which 39 articles were pertaining to ecological sciences. In comparison, Sri Lanka, Indonesia, Thailand and Mal- dives had, respectively, eight, four, 21 and two articles pertaining to ecology. In India, bioshields received the major share of scientific interest (14 out of 39) while only one study (each) was dedicated to corals, seagrasses, sea- weeds and meiofauna, pointing to the paucity of research attention dedicated to these critical ecosystems. We noted that very few interdisciplinary studies looked at linkages between pure/applied sciences and the social sciences in India. In addition, there appears to be little correlation between the limited research that was done and its influence on policy in India. This review points to gap areas in eco- logical research in India and highlights the lessons learnt from research in other tsunami-affected countries. It also provides guidance on the links between science and policy that are required for effective coastal zone management.
- Journal Article2010Implications of conserving an ecosystem modifier: Increasing green turtle (Chelonia mydas) densities substantially alters seagrass meadowsBiological Conservation 143: 2730-2738
Ecosystem modifiers have the ability to significantly alter the ecosystem they inhabit sometimes with serious consequences for their own populations. We evaluated the ability of green turtles (Chelonia mydas) to modify seagrass ecosystems by their foraging activity. This study was conducted in a seagrass-dominated lagoon in the Lakshadweep Islands, Indian Ocean, where a stable high-density congregation of green turtles is present. We determined a gradient of turtle density in the lagoon and measured the intensity of turtle herbivory across the gradient. We then measured the impact of increasing grazing on seagrass structural parameters, growth and flowering along this gradient. Our results indicate that turtles substantially change seagrass meadow structure (canopy height, shoot length, width and density), reduce flowering and can potentially even cause changes in the species composition of the meadow. We discuss the implications of these results for seagrass ecosystem function, green turtle movement and human attitudes. When conserving ecosystem modifiers like the green turtle, any management strategy needs to include a detailed knowledge of the roles these species play in the ecosystems they inhabit.