7 Works

Effect of resource limitation on host post-infection survival and systemic pathogenic growth

N. G. Prasad, Aabeer Basu, Aparajita Singh, Tanvi Madaan & Suhaas Sehgal
In the experiments presented here, we explore the effect of resource limitation, in form of starvation (which leads to decrease in accessible resources and depletion of reserves) and sexual activity (which leads to reallocation of resources from somatic defence towards reproduction), on immune function of female Drosophila melanogaster flies. We infected females with five bacterial pathogens and measured their post-infection survival when subjected to either starvation or sexual activity (mating). Additionally, we measured within host...

Drosophila melanogaster hosts coevolving with Pseudomonas entomophila pathogen show sex-specific patterns of local adaptation

N. G. Prasad, Neetika Ahlawat, Manas Geeta Arun, Komal Maggu, Jigisha Isha & Aparajita Singh
Background: In spatially structured populations, local adaptation improves organisms’ fitness in their native environment. Host and pathogens can rapidly adapt to their local antagonist. Since males and females can differ in their immunocompetence, the patterns of local adaptation can be different between the sexes. However, there is little information about sex differences in local adaptation in host-pathogen systems. Results: In the current study, we experimentally coevolved four different replicate populations of Drosophila melanogaster (host) and...

Increasing adult density compromises survival following bacterial infections in Drosophila melanogaster

Paresh Das, Aabeer Basu & N G Prasad
The density-dependent prophylaxis hypothesis predicts that risk of pathogen transmission increases with increase in population density, and in response to this, organisms mount a prophylactic immune response when exposed to high density. This prophylactic response is expected to help organisms improve their chances of survival when exposed to pathogens. Alternatively, organisms living at high densities can exhibit compromised defense against pathogens due to lack of resources and density associated physiological stress; the crowding stress hypothesis....

Finding love: fruit fly males evolving under higher sexual selection are inherently better at finding receptive females

N G Prasad, Komal Maggu, Sneha Kapse, Neetika Ahlawat & Manas Geeta Arun
Courtship is an important component of male reproductive behaviour that enables males to learn about the suitability of their mating partners. Experimental evidence suggests that Drosophila melanogaster males can learn to modify their courtship behaviour based on their prior experience with unreceptive females. This courtship learning is expected to provide a fitness advantage to males and could therefore evolve given suitable heritable variation. We investigated the role of sexual selection in the evolution of courtship...

Male mating success evolves in response to increased levels of male-male competition

Tejinder Singh Chechi, Aaditya Narasimhan, Broti Biswas & N. G. Prasad
Male-biased operational sex ratios can increase male-male competition and can potentially select for both increased pre-and post-copulatory male success. In the present study, using populations of Drosophila melanogaster evolved under male-biased (M) or female-biased (F) sex ratios, we asked whether (a) male mating success can evolve (b) males are better at mating females that they have co-evolved with (c) males mating success is affected by female mating status and (d) male mating success is correlated...

Global biogeography of warning colouration in the butterfly Danaus chrysippus

Wanzhen Liu, David A. S. Smith, Gayatri Raina, Rowan Stanforth, Ivy Ng’Iru, Piera Ireri, Dino J. Martins, Ian J. Gordon & Simon H. Martin
Warning colouration provides a textbook example of natural selection, but the frequent observation of polymorphism in aposematic species presents an evolutionary puzzle. We investigated biogeography and polymorphism of warning patterns in the widespread butterfly Danaus chrysippus using records from citizen science (n=5467), museums (n=8864), and fieldwork (n=2586). We find that polymorphism in three traits controlled by known mendelian loci is extensive. Broad allele frequency clines, hundreds of km wide, suggest a balance between long-range dispersal...

No major cost of evolved survivorship in Drosophila melanogaster populations coevolving with Pseudomonas entomophila

Neetika Ahlawat, Komal Maggu, , Manas Arun Geeta, Abhishek Meena, Amisha Agarwala & Nagaraj Guru Prasad
Rapid exaggeration of host and pathogen traits via arms race dynamics is one possible outcome of host-pathogen coevolution. However, the exaggerated traits are expected to incur costs in terms of resource investment in other life-history traits. The current study investigated the costs associated with evolved traits in a host-pathogen coevolution system. We used the Drosophila melanogaster (host)-Pseudomonas entomophila (pathogen) system to experimentally derive two selection regimes, one where the host and pathogen both coevolved, and...

Registration Year

  • 2022

Resource Types

  • Dataset


  • Indian Institute of Science Education and Research Mohali
  • University of Rwanda
  • University of Edinburgh
  • Eton College
  • International Centre of Insect Physiology and Ecology
  • Mpala Research Center and Wildlife Foundation
  • South China Agricultural University