- Journal Article2015Sharing mechanisms in corporate groups may be more resilient to natural disasters than kin groups in the Nicobar IslandsHuman Ecology. 43:709-720
It has been suggested that kin groups are better predisposed to cooperatively manage essential natural resources than non-kin groups because of inclusive fitness gains. Whether these long-term genetic pay-offs sufficiently offset the immediate costs of cooperation in periods of scarcity is uncertain. We compared patterns of resource sharing across three island communities in the Nicobar Archipelago affected by the 2004 tsunami. While sharing mechanisms were similar across regions, group composition varied: Central and Southern Nicobar were organised along kinship lines, while Chowra was organised as corporate alliances of unrelated households. We documented post-tsunami losses and conflicts emerging in resource sharing after the event. While kin groups showed considerable breakdown in resource sharing arrangements, corporate communities in Chowra were much more resilient to change. Our results suggest that the more immediate reciprocity of corporate alliances may outweigh the potential benefits of inclusive fitness when faced with conditions of extreme resource scarcity.
- Popular Article2015Jewels of the seabedThe Hindu in School, October 14
- Popular Article2015Tashi the explorerThe Hindu in School, 28 October
- Popular Article2015To ride an elephant (or not)The Hindu in School, 23 DecemberDownload
PDF, 1.59 MB
- Popular Article2015Where the land meets the seaThe Hindu in School, 2 December
- Popular Article2015சரியாக நடக்கின்றனவா வனஉயிரின வார விழாக்கள். (Comments on 2015 Tiruppur Wildlife Week celebration)The Hindu Tamil News Daily, Online edition. 9th October 2015.
- Poster2015Poster depicting dog and leopard pugmarks designed to help reduce anxiety and tensions - English versionMarch 2015Download
JPG, 611 KB
On many instances dog pugmarks are mistaken as leopard tracks and there is pressure exerted on the forest department to capture leopards from the area. This has led to unnecessary anxiety in communities, tensions between communities and forest department, and possibly capture of leopards with no reason. Hence, a poster that would differentiate tracks between dogs and leopards were designed to help in awareness activities.
- Book2015Common Marine Life of LakshadweepDownload
PDF, 10.2 MB
A pocket guide to Lakshadweep's common marine creatures.
- Thesis2015Distribution, nesting trees preference and nesting success of heronries in Rupandehi and Kapilbastu districts, NepalA Dissertation prepared for partial fulfillment of the requirement of the Master of Science (M.Sc.) degree in Environmental Science of Tribhuvan University. Submitted to: Department of Environmental Science, Khwopa College (Affiliated to Tribhuvan University), Nepal. 48 pp.
The study was carried out in forty-seven VDCs of the adjoining districts, Rupandehi and Kapilbastu of lowland, southern Nepal. This study was focused on the distribution pattern of all heronries as well as for species, nesting trees preference relative to the overall availability on the overall landscape and nesting success of three species (LAS: Lesser Adjutant Stork Leptoptilos javanicus, AOB: Asian Openbill Anastomus oscitans and PH: Pond Heron Ardeola grayii) at heronries.
The survey was carried out from august 2014 with intensive survey of focal villages during visits of random points for nest tree preference. Bird species, tree species along with girth at breast height (GBH) and height were recorded. Altogether 75 heronries of AOB, LAS, CE: Cattle Egret Bubulcus ibis, PH, WNS: Woolly necked Stork Ciconia episcopus and RNI: Red naped Ibis Pseudibis papillosa were recorded. From Variance mean ratio (VMR), these heronries were distributed randomly. Similarly, AOB, LAS and CE were also distributed randomly as well. Heronries were distributed in all over the study area except some VDCs but they were sighted in those areas as well. AOB were distributed in six VDCs of Rupandehi while PH was distributed in two VDCs of Kapilbastu districts despite of this, their distribution pattern was random from VMR calculation. LAS and CE were distributed in both districts very well. They were also distributed randomly.
Bombax ceiba and Ficus religiosa were preferred by heronries as well as by individual species more than availability. Mangifera indica and Dalbergia sisoo were available most in the area. The preferred trees have more GBH (>200 cm) and height (>15 m) compared to random points. A single species appears to have different preferences based on the location of the study. CE preferred all range GBH trees than other bird species. The nesting success of AOB, LAS and PH were obtained to be nearly 95.12±15.8, 82.05±35.39 and 57±40.48 per heronries and the chicks fledge per nest for respective species was obtained to be 2.43±0.7, 1.51±0.69 and 1.32±1.42 respectively. There was negligible difference in numbers of chick fledged in case of AOB and LAS whereas PH has huge variation in numbers of chicks per nest.
Therefore, the landscape of lowland Nepal provides excellent condition for wide variety of large waterbirds to nest in heronries despite enormous human distribution.
Key words: Heronries, Distribution, Nest tree preference, Nesting Success.
- Thesis2015Food-provisioning behaviour in heronries in Rupandehi and Kapilbastu districts of NepalDissertation Submitted for the partial fulfillment of the requirements for Master of Science in Environment Science of Tribhuvan University Majoring in Biodiversity Conservation and Wildlife Management. Submitted to Department of Environmental Science Khwopa College ((Affiliated to Tribhuvan University), Nepal. 38pp.
Food provisioning is directly influenced by the availability of food resources around the nesting site and provisioning by the parents. This study was carried out to assess food provisioning in heronries with respect to i) water bird species, ii) chicks age iii) heronry size and iv) behaviour changes across the nesting season in Heronries during the 2014-15 nesting season. Study was carried out in 36 Village Development Committee (VDCs) of Rupandehi and 11 VDCs of Kapilbastu. Road routes were taken as transect for survey and covered once in 15 days during the entire nesting season (egg laying to fledging of chicks from nests; Aug 2014-Jan 2015). The food provisioning behaviour of Asian open bill (AOB) and Lesser Adjutant Stork (LAS) of varied sizes (Heronry size: no of nest in a tree) were taken for study. The food provisioning behaviour observations were carried out in the morning (6 am-12 pm) at 10-15 days interval in each heronry.
The average food provisioning time of AOB and LAS heronries was found to be 27.67±29.29 (n=341) and 38.13±49.99 (n=381) respectively. Both the species prefer short provisionig time i.e. more than 50% of provisioning time for both AOB heronries and LAS heronries was less than 20 minutes. The frequency percentage of provisioning time decreased continuously as the provisioning time increased at all stages of AOB as well as LAS heronry. Similarly, in case of heronry size for AOB heronries the average provisioning time was almost similar for all heronry size.and found to be not significantly different (χ2=0.93, P3,0.05=7.815). For LAS heronries the average provisioning time was high for heronry size 1 and size 5 and found to significantly different for heronry size (χ2=47.902, P14,0.05=12.592). Initially (first week of September) average provisioning time for AOB heronries was lowest and gradually increased till fledging of chick (late October). But in case of LAS heronries before October the average provisioning time was almost similar and increased from November to till fledging of chick (January).
Provisioning behaviour studies on waterbird species that form heronries are not available from Nepal, and are rare from South Asia. Thus outcome of this research would be step towards filling gap in ornithology and for understanding heronry ecology to help with planning, management and sustainable conservation of heronry birds in lowland of Nepal.
Keyword: Provisioning behaviour, Heronry, Nestling age, Heronry size vi
- Journal Article2015Synchronous Spawning of the Sea CucumberHolothuria (Lessonothuria) pardalisSelenka, 1867 in the Andaman Archipelago, IndiaJournal of Bombay Natural History Society, 112 (2) 10.17087/jbnhs/2015/v112i2/104950
- Book2015SeasonWatch Book of Activities (Level 2)Download
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- Poster2015Common Trees of India: An Identification Guide to SeasonWatch TreesDownload
PDF, 7.25 MB
Size: 3500px width; 7.6 Mb
- Dataset2015Data from: Demographic superiority with increased logging in tropical understorey insectivorous birds. Journal of Applied EcologyData Dryad. http://dx.doi.org/10.5061/dryad.bk8p4
- Book2014Interdisciplinary Perspectives on Consciousness and the SelfSpringer India, New Delhi
- Book Chapter2014Nature and Culture in the wild: Biological foundations of behavioural traditions in non-human primatesPages 367-389 in R Narasimha and S Menon (editors) Nature and Culture Volume XIV, Part 1, Project of History of Indian Science, Philosophy and Culture Centre for Studies in Civilizations, New DelhiDownload
PDF, 202 KB
A variety of mechanisms for socially facilitated learning allow animals to acquire information from the behaviour of others, and through their own modified behaviour such information can subsequently be transmitted between individuals within and across generations. Variation in such socially acquired and transmitted behaviours is unlikely to be under direct genetic control since individuals who are closely related genetically can have and pass on very different behaviours; this is also true for cultural traditions that such behaviours may have generated. Behavioural information transfer of this nature thus represents another form of inheritance that operates in many nonhuman species, including primates, in tandem with the more basic genetic system. Most behavioural traditions usually precede genetic adaptations but exert persistent directional selection for genetic variations congruent with the new patterns of behaviour since such traditions lead to the transmission of the same selective regime. Selection for the ability to learn a particular behaviour pattern more efficiently and rapidly may also lead to it becoming dependent on fewer learning trials or none at all – ultimately culminating in a partial or complete incorporation of the trait into the basic genetic inheritance system. This paper reviews principles of culture and its biological foundations, and examines the rôles that behavioural inheritance and socially transmitted cultural traditions play in the structure and dynamics of primate societies, with particular reference to data from long-term field studies on Japanese macaques and from bonnet macaques, a species endemic to peninsular India. Three principal consequences are considered: the appearance of individual behavioural traits leading to the establishment of social traditions, the rôle of stable behavioural traditions in facilitating cultural selection, and the influence of particular behavioural and life-history traits on gene-culture coevolution in nonhuman primates.
- Book Chapter2014Experientially Acquired Knowledge of the Self in a Nonhuman PrimatePages 81-99 in Sangeetha Menon, Anindya Sinha and B V Sreekantan (editors) Interdisciplinary Perspectives on Consciousness and the Self, Springer, India
The pressures of developing and maintaining intricate social relationships may have led to the evolution of enhanced cognitive abilities in many social nonhuman species, particularly primates. Knowledge of the dominance ranks and social relationships of other individuals, for example, is important in evaluating one’s position in the prevailing affiliative and dominance networks within a primate society and could be acquired through direct or perceived experience. Allogrooming supplants among female bonnet macaques usually involve the subordinate female of a grooming dyad retreating at the approach of a third female, dominant to both members of the dyad, although, in a few exceptional cases, the dominant member of the dyad could, instead, retreat. Retreat by the dominant individual was observed to be positively correlated to the social attractiveness of her subordinate companion, indicating that individual females successfully evaluate social relationships among other group females. Logistic regression analysis revealed the probability of retreat of the dominant female to be significantly influenced by her own dominance rank and those of the other two interacting females. Individual macaques thus possess egotistical knowledge of their own positions, relative to those of others, in the social hierarchy and appear to, therefore, abstract and mentally represent their own personal attributes as well as those of other members of the group. The experiential acquisition of such cognitive knowledge of the self raises important questions about the possible mechanisms underlying the nature of this mental representation and the general ability to categorise social information in non-verbalizing animal species such as macaques.
- 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.
- Journal Article2014A penny saved is a penny earned: lean season foraging strategy of an alpine ungulateAnimal Behaviour 92, 93-100