• Selection for narrow gate of emergence results in correlated sex-specific changes in life history of Drosophila melanogaster 

  Varma, Vishwanath; Kannan, Nisha N.; Sharma, Vijay Kumar (Company Of Biologists Ltd, 2014)

  Since the ability to time rhythmic behaviours in accordance with cyclic environments is likely to confer adaptive advantage to organisms, the underlying clocks are believed to be selected for stability in timekeeping over ...
• Rhythmic egg-laying behaviour in virgin females of fruit flies Drosophila melanogaster 

  Menon, Anuj; Varma, Vishwanath; Sharma, Vijay Kumar (Informa Healthcare, 2014)

  Fruit fly Drosophila melanogaster females display rhythmic egg-laying under 12: 12 h light/dark (LD) cycles which persists with near 24 h periodicity under constant darkness (DD). We have shown previously that persistence ...
• Role of Temperature in Mediating Morning and Evening Emergence Chronotypes in Fruit Flies Drosophila melanogaster 

  Nikhil, K. L.; Goirik, Gupta; Ratna, Karatgi; Sharma, Vijay Kumar (Sage Publications Inc, 2014)

  Following decades of research under controlled laboratory conditions, there has been growing interest in the recent past to study circadian rhythms in nature. Recent studies conducted under natural conditions have been ...
• Interaction of light regimes and circadian clocks modulate timing of pre-adult developmental events in Drosophila 

  Yadav, Pankaj; Thandapani, Madhumohan; Sharma, Vijay Kumar (Biomed Central Ltd, 2014)

  Background: Circadian clocks have been postulated to regulate development time in several species of insects including fruit flies Drosophila melanogaster. Previously we have reported that selection for faster pre-adult ...
• Breakdown of selection-mediated correlation between development time and clock period 

  Yadav, Pankaj; Sharma, Vijay Kumar (Pergamon-Elsevier Science Ltd, 2014)

  Previously we have reported that selection for faster pre-adult development in fruit flies speeded-up development by similar to 29-h and shortened the clock period (tau) by similar to 0.5 h, which suggests that development ...
• Circadian clocks of faster developing fruit fly populations also age faster 

  Yadav, Pankaj; Sharma, Vijay Kumar (Springer, 2014)

  Age-related changes in circadian rhythms have been studied in several model organisms including fruit flies Drosophila melanogaster. Although a general trend of period (tau) lengthening, reduction in rhythm strength and ...
• Correlated changes in life history traits in response to selection for faster pre-adult development in the fruit fly Drosophila melanogaster 

  Yadav, Pankaj; Sharma, Vijay Kumar (Company Of Biologists Ltd, 2014)

  Insects including the fruit fly Drosophila melanogaster are under intense pressure to develop rapidly because they inhabit ephemeral habitats. We have previously shown that when selection for faster development was ...
• Life-history traits of Drosophila melanogaster populations exhibiting early and late eclosion chronotypes 

  Nikhil, K. L.; Ratna, Karatgi; Sharma, Vijay Kumar (Biomed Central Ltd, 2016)

  Background: The hypothesis that circadian clocks confer adaptive advantage to organisms has been proposed based on its ubiquity across almost all levels of complexity and organization of life-forms. This thought has received ...
• Circadian clock properties of fruit flies Drosophila melanogaster exhibiting early and late emergence chronotypes 

  Nikhil, K. L.; Vaze, Koustubh M.; Ratna, Karatgi; Sharma, Vijay Kumar (Taylor & Francis Inc, 2016)

  The role of circadian clocks in timing daily behaviors is widely acknowledged, and while empirical evidence suggests that clock period is correlated with the preferred phase of a rhythmic behavior (chronotype), other clock ...
• Evolution of robust circadian clocks in Drosophila melanogaster populations reared in constant dark for over 330 generations 

  Shindey, Radhika; Varma, Vishwanath; Nikhil, K. L.; Sharma, Vijay Kumar (Springer Heidelberg, 2016)

  Robustness is considered to be an important feature of biological systems which may evolve when the functionality of a trait is associated with higher fitness across multiple environmental conditions. Thus, the ability to ...
• Molecular Correlates of Circadian Clocks in Fruit Fly Drosophila melanogaster Populations Exhibiting early and late Emergence Chronotypes 

  Nikhil, Kunjalli Lokesh; Abhilash, Lakshman; Sharma, Vijay Kumar (Sage Publications Inc, 2016)

  Although association of circadian clock properties with the timing of rhythmic behaviors (chronotype) has been extensively documented over several decades, recent studies on mice and Drosophila have failed to observe such ...
• On the relevance of using laboratory selection to study the adaptive value of circadian clocks 

  Abhilash, Lakshman; Sharma, Vijay Kumar (Wiley-Blackwell, 2016)

  The phrase as sure as night comes after day' highlights the most conspicuous phenomenon on earth (i.e. the daily cycling of geophysical factors). It is hypothesized that life-forms on earth have evolved timekeeping mechanisms ...
• Social Experience Is Sufficient to Modulate Sleep Need of Drosophila without Increasing Wakefulness 

  Lone, Shahnaz Rahman; Potdar, Sheetal; Srivastava, Manishi; Sharma, Vijay Kumar (Public Library of Science, 2016)

  Organisms quickly learn about their surroundings and display synaptic plasticity which is thought to be critical for their survival. For example, fruit flies Drosophila melanogaster exposed to highly enriched social ...
• Late emergence chronotypes of fruit flies Drosophila melanogaster exhibit higher accuracy of entrainment 

  Nikhil, K. L.; Vaze, Koustubh M.; Sharma, Vijay Kumar (Taylor & Francis Inc, 2015)

  Inter-individual variation in phase-of-entrainment (chronotype) is widely observed in many species, but the underlying mechanisms and its consequences remain largely unexplored. In light of considerable limitations of ...
• Extent of mismatch between the period of circadian clocks and light/dark cycles determines time-to-emergence in fruit flies 

  Yadav, Pankaj; Choudhury, Deepak; Sadanandappa, Madhumala K.; Sharma, Vijay Kumar (Wiley-Blackwell, 2015)

  Circadian clocks time developmental stages of fruit flies Drosophila melanogaster, while light/dark (LD) cycles delimit emergence of adults, conceding only during the allowed gate. Previous studies have revealed that ...
• Effects of polygamy on the activity/rest rhythm of male fruit flies Drosophila melanogaster 

  Vartak, Vivek Rohidas; Varma, Vishwanath; Sharma, Vijay Kumar (Springer Heidelberg, 2015)

  Although polygamy is common in insects, its extent varies enormously among natural populations. Mating systems influence the evolution of reproductive traits and the difference in extent of polygamy between males and females ...
• Or47b-neurons promote male-mating success in Drosophila 

  Lone, Shahnaz Rahman; Venkataraman, Archana; Srivastava, Manishi; Potdar, Sheetal; Sharma, Vijay Kumar (Royal Society, London, 2015)

  Drosophila performs elaborate well-defined rituals of courtship, which involve several types of sensory inputs. Here, we report that Or47b-neurons promote male-mating success. Males with Or47b-neurons silenced/ablated ...
• Response to 'Remarks on the article on life-history traits in Drosophila populations selected for rapid development by Yadav and Sharma' 

  Yadav, Pankaj; Sharma, Vijay Kumar (Company Of Biologists Ltd, 2015)
• Jet lag and enhanced susceptibility to malaria 

  Kumar, C Jairaj; Sharma, V K; Kumar, Arunachalam (Churchill Livingstone, 2006)
• Timekeeping Through Social Contacts: Social Synchronization of Circadian Locomotor Activity Rhythm in the Carpenter Ant Camponotus paria 

  Lone, Shahnaz Rahman; Sharma, V K (Informa Healthcare, 2011)

  In ant colonies a large proportion of individuals remain inside nests for most of their lives and come out only when necessary. It is not clear how, in a nest of several thousand individuals, information about local time ...

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