- Popular Article2012Kosi: a river that can’t be pinned downThe Hindu in School, 29 August
- Poster2012Poster for public information campaigns to dissuade people from "rescuing" leopard cubsOctober 2012Download
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This poster was part of public information campaigns undertaken in order to highlight the impacts of picking up leopard cubs from forests, sugarcane fields and other areas.
- Popular Article2012Flight of the GooseThe Hindu in School, 7 November
- Popular Article2012The curious case of the wormThe Hindu in School, 19 December
- Popular Article2012காப்பிநல்லதா?டீநல்லதா? (On best practices in sustainable agriculture of Coffee and Tea)புதிய தலைமுறை. 6 செப்டம்பர் 2012. Puthiya Thalaimurai. 6th September 2012.
காப்பிநல்லதா? டீநல்லதா?. காக்கைக்குருவிஎங்கள்ஜாதிதொடர்-9. புதியதலைமுறை. 6 செப்டம்பர் 2012.[Jeganathan, P. (2012).Kappi nallatha? Tea nallatha?. Kakkai Kuruvi Engal Jathi-Series, Article No.9. Puthiya Thalaimurai. 6th September 2012. (On best practices in sustainable agriculture of Coffee and Tea)]
- Popular Article2012தேசாந்திரியின்தோற்றப்பிழை. (On the impact of polarized light on Wandering Gliders)புதிய தலைமுறை. 23 ஆகஸ்டு 2012. Puthiya Thalaimurai. 23rd August 2012.
- Popular Article2012A home for the house sparrowThe Hindu in School, 18 April
Jeganathan, P. (2012). A home for the house sparrow. The Hindu in School, 18 April.
- Popular Article2012Dugongs, mermaids of the seaThe Hindu in School, 26 September
- Popular Article2012A thousand leopards in the SeaThe Hindu in School, 29 September
- Report2012Protecting a hornbill haven: a community-run conservation initiative around Pakke Tiger ReserveHNAP Report for 2012Download
PDF, 2.11 MB
2012 Report for Hornbill Nest Adoption Program
- Popular Article2012Trans-Himalaya: In the shadows of a giantCare4Nature
- Journal Article2012Patterns of species participation across multiple mixed-species flock types in a tropical forest in northeastern India.Journal of Natural History. 46(43-44):2749–2762.Download
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We studied mixed-species bird flocks in northeastern India to (a) develop a framework for quantifying species participation in mixed-species flocks, (b) characterize the ecology and behaviour of participant species, and (c) explore mechanisms influencing the coexistence of different mixed-species flock types. To characterize participation in mixed-species flocks, we implement a new method incorporating species abundances, minimizing potential biases in measuring participation arising from differences in the availability of flocking species. There are at least three distinct flock types in the lowland forests of northeastern India; these flock types differ in the body mass and vertical stratum use of participant species. The “core” of mixed-species flocks was composed of a species group that differed much more in their foraging method in comparison with “attendant” species. The exchange of benefits and minimization of interspecific competition might lead to, and maintain, heterogeneity in foraging methods among core species of mixed-species flocks.
- Popular Article2012Shared parentingHindu Survey of the Environment, July 2012, pp. 88-97.Download
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A programme to adopt hornbill nests in Arunachal Pradesh is giving these great birds a chance to survive in Pakke,
- Popular Article2012கூடுகட்டவாகுருவி. (On House Sparrows)புதிய தலைமுறை. 19ஜூலை 2012 Puthiya Thalaimurai. 19th July 2012
- Journal Article2012To eat and not be eaten: modelling resources and safety in multi-species animal groups.PLoS ONE. 7(7): e42071.Download
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Using mixed-species bird flocks as an example, we model the payoffs for two types of species from participating in multi-species animal groups. Salliers feed on mobile prey, are good sentinels and do not affect prey capture rates of gleaners; gleaners feed on prey on substrates and can enhance the prey capture rate of salliers by flushing prey, but are poor sentinels. These functional types are known from various animal taxa that form multi-species associations. We model costs and benefits of joining groups for a wide range of group compositions under varying abundances of two types of prey–prey on substrates and mobile prey. Our model predicts that gleaners and salliers show a conflict of interest in multi-species groups, because gleaners benefit from increasing numbers of salliers in the group, whereas salliers benefit from increasing gleaner numbers. The model also predicts that the limits to size and variability in composition of multi-species groups are driven by the relative abundance of different types of prey, independent of predation pressure. Our model emphasises resources as a primary driver of temporal and spatial group dynamics, rather than reproductive activity or predation per se, which have hitherto been thought to explain patterns of multi-species group formation and cohesion. The qualitative predictions of the model are supported by empirical patterns from both terrestrial and marine multi-species groups, suggesting that similar mechanisms might underlie group dynamics in a range of taxa. The model also makes novel predictions about group dynamics that can be tested using variation across space and time.
- Popular Article2012As the crow flies…The Hindu in School, 25 April
Jeganathan, P. (2012). As the crow flies… The Hindu in School, 25April.
- Popular Article2012The feathered forestersSaevus 1(4, Sep/Oct): 28-33.
- Popular Article2012காணாமல் போகும் சாலையோர உலகம் (On disappearing roadside trees)Puthiya Thalaimurai, Tamil Weekly Magazine, 30 August
காணாமல் போகும் சாலையோர உலகம். காக்கைக் குருவி எங்கள் ஜாதி தொடர்-8. புதிய தலைமுறை. 30ஆகஸ்டு 2012. [Jeganathan, P. (2012).Kanamal Pogum Salaiyora Ulagam. Kakkai Kuruvi Engal Jathi-Series, Article No.8 Puthiya Thalaimurai. 30th August 2012. (On disappearing roadside trees)]
- Popular Article2012Of tamarind and toleranceThe Hindu Magazine, 17 June 2012, page 4.
Link to this article here.
- Journal Article2012Optimizing individual identification and survey effort for photographic capture–recapture sampling of species with temporally variable morphological traitsAnimal Conservation 15(2): 174-183
Endangered, wide-ranging megafauna have many threats to contend with during their struggle for survival in an ever-increasing human dominance of the environment. Reliable monitoring of endangered large mammal populations is therefore a critical conservation requirement. Photographic capture–recapture (CR) techniques have opened up avenues for population monitoring of individually recognizable large mammal species. The efficient application of these techniques, however, can be constrained by challenges in reliably identifying individuals arising from the use of multiple, and potentially variable traits, as well as issues of temporal sampling of populations in the field. We address these key problems by describing an automated process of rapidly identifying individual Asian elephants (Elephas maximus) from photographs, and comparing resultant CR-based population parameter estimates with those obtained using supervised visual identification of individuals. In addition, we assess the temporal effort necessary for robust estimation of demographic parameters in our study population. Morphological traits that maintain constancy over time, including variations in tusk characteristics, and ear fold and lobe shape, proved the most reliable for individual identification and subsequent estimation of population parameters. The use of temporally variable traits contributed to high probabilities of misidentification and biased estimates of population size. We found a minimum of seven sampling occasions necessary for reliable population estimation. Our study contributes to design issues for CR studies by providing insights into optimality of sampling effort such that precision of parameter estimates are not compromised while minimizing survey costs. We demonstrate the importance of accurate individual identification in the context of such studies and recommend the use of fixed morphological traits as the optimal individual identification strategy for species where animals are distinguished on the basis of multiple attributes, including some that may be variable over time.