- Popular Article2013Fungi forayThe Hindu, Young World, 29th January 2013.
Jeganathan, P. (2013). Fungi foray. The Hindu, Young World, 29th January 2013. http://www.thehindu.com/life-and-style/kids/fungi-foray/article4353151.ece
- Journal Article2013Antelope mating strategies facilitate invasion of grasslands by a woody weed.Oikos. 122(10): 1441-1452.Download
PDF, 357 KB
Intra and interspecific variation in frugivore behaviour can have important consequences for seed dispersal outcomes. However, most information comes from among-species comparisons, and within-species variation is relatively poorly understood. We examined how large intraspecific differences in the behaviour of a native disperser, blackbuck antelope Antilope cervicapra, influence dispersal of a woody invasive, Prosopis juliflora, in a grassland ecosystem. Blackbuck disperse P. juliflora seeds through their dung. In lekking blackbuck populations, males defend clustered or dispersed mating territories. Territorial male movement is restricted, and within their territories males defecate on dung-piles. In contrast, mixed-sex herds range over large areas and do not create dung-piles. We expected territorial males to shape seed dispersal patterns, and seed deposition and seedling recruitment to be spatially localized. Territorial males had a disproportionately large influence on seed dispersal. Adult males removed twice as much fruit as females, and seed arrival was disproportionately high on territories. Also, because lek-territories are clustered, seed arrival was spatially highly concentrated. Seedling recruitment was also substantially higher on territories compared with random sites, indicating that the local concentration of seeds created by territorial males continued into high local recruitment of seedlings. Territorial male behaviour may, thus, result in a distinct spatial pattern of invasion of grasslands by the woody P. juliflora. An ex situ experiment showed no beneficial effect of dung and a negative effect of light on seed germination. We conclude that large intraspecific behavioural differences within frugivore populations can result in significant variation in their effectiveness as seed dispersers. Mating strategies in a disperser could shape seed dispersal, seedling recruitment and potentially plant distribution patterns. These mating strategies may aid in the spread of invasives, such as P. juliflora, which could, in turn, negatively influence the behaviour and ecology of native dispersers.
- Journal Article2013People, predators and perceptions: patterns of livestock depredation by snow leopards and wolves.Journal of Applied Ecology 50 (3), 550-560
- Journal Article2013Understanding the patchy distribution of four-horned antelope Tetracerus quadricornis in a tropical dry deciduous forest in Central IndiaJournal of Tropical Ecology, 1-10. doi:10.1017/S0266467413000722
At the landscape level, the four-horned antelope is confined to tropical dry deciduous forests and within these, their distribution is patchy. Various factors have been proposed as determinants for their patchy distribution within landscapes, but none provided an adequate explanation. We hypothesized that availability of a constant supply of forage influenced the species distribution.We found that the four-horned antelope mainly fed on fruits and flowers, and that a total of 60% of the tree species in Panna Tiger Reserve bore fruits at different times of the year. High tree species richness in habitat patches was considered a surrogate for constant supply of forage for the four-horned antelope. Data from 547 sighting locations between 2002 and 2006 and six spatial layers were analysed using maximum entropy to produce a probability distribution model for the four-horned antelope in Panna Tiger Reserve. Our model predicted that habitat patches summing up to only 9.5% of the 543 km2 of Panna Tiger Reserve had high probability of distribution (>0.5) of four-horned antelope. Although all variables contributed to the distribution model of the four-horned antelope, explanatory power was highest for tree species richness within habitat patches. The distribution of four-horned antelope within tropical dry deciduous forests can be treated as an indicator of high tree diversity and hence habitat quality.
- Popular Article2013Jalebis at the forest fenceThe Hindu in School, 6 March
- Book Chapter2013Goral Nemorhaedus goralMammals of South Asia (eds A. J. T. Johnsingh & N.Manjrekar).Universities Press, Hyderabad.
- Journal Article2013An expedition to Narcondam: observations of marine and terrestrial fauna including the island-endemic hornbill.Current Science 105: 346-360.
- Journal Article2013Design and Evaluation of a Robust Optical Beam-Interruption-Based Vehicle Classiﬁer SystemIEEE Transactions on Intelligent Transportation Systems 14(3): 1043-1052Download
PDF, 833 KB
This paper presents the design and development of a novel optical vehicle classifier system, which is based on interruption of laser beams, that is suitable for use in places with poor transportation infrastructure. The system can estimate the speed, axle count, wheelbase, tire diameter, and the lane of motion of a vehicle. The design of the system eliminates the need for careful optical alignment, whereas the proposed estimation strategies render the estimates insensitive to angular mounting errors and to unevenness of the road. Strategies to estimate vehicular parameters are described along with the optimization of the geometry of the system to minimize estimation errors due to quantization. The system is subsequently fabricated, and the proposed features of the system are experimentally demonstrated. The relative errors in the estimation of velocity and tire diameter are shown to be within 0.5% and to change by less than 17% for angular mounting errors up to 30°. In the field, the classifier demonstrates accuracy better than 97.5% and 94%, respectively, in the estimation of the wheelbase and lane of motion and can classify vehicles with an average accuracy of over 89.5%.
- Popular Article2013Development minus green shootsThe Hindu, 13 February 2013
By exempting some projects on forest land from gram sabha consent, the government has undermined the rights of local communities and their crucial role in protecting the environment.
Read further here
- Book Chapter2013Arunachal macaque Macaca munzala (Sinha, Datta, Madhusudan and Mishra 2005)Pages 198-210 in A. J. T. Johnsingh & N. Manjrekar (editors) Mammals of South Asia – Volume 1. Universities Press, Hyderabad, India
- Popular Article2013An apology to the Iyerpadi gentlemanThe Hindu Magazine, 14 April 2013, page 4.
- Popular Article2013Living in an extreme worldThe Hindu, Editorial Page, 13 July 2013, page 10.
There is compelling evidence to show that man weather-related disasters are not chance occurrences but are a result of human activities that have altered our atmosphere.
- Report2013Hornbill Nest Adoption Program - 2013 Breeding seasonHNAP Report for 2013Download
PDF, 1.78 MB
2013 Report for Hornbill Nest Adoption Program
- 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.
- Popular Article2013Death in the hillsIndian Express, The Sunday Express Magazine
Foot-and-mouth disease (FMD) had made its way into the mountains from the plains of Pasighat in Arunachal Pradesh. The worst affected were the semi-domesticated mithun (Bos frontalis) that were dying out even as their owners watched helplessly. Each day, as one more animal was found dead in the forest or beside the road, another few were seen salivating profusely from the mouth as the infection spread rapidly.
- Poster2013Poster designed to carry out awareness programs regarding human-leopard conflictMarch 2013Download
JPG, 1.17 MB
Leopard outreach activities are carried out based on the locations identified through conflict monitoring activity. This poster specifically designed to address conflict issues is distributed to communities to minimize anxiety and help in conflict reduction.
- Popular Article2013THE resurrectionThe Hindu in School, 23 October
- Popular Article2013All in a nameThe Hindu in School, 16 October
- Popular Article2013A day in the life of a butterfly fishThe Hindu in School, 10 July
- Popular Article2013Three different voicesThe Hindu in School, 17 July