Natural variation in chemosensation: lessons from an island nematode

  title={Natural variation in chemosensation: lessons from an island nematode},
  author={Angela McGaughran and Katy Morgan and Ralf J. Sommer},
  journal={Ecology and Evolution},
  pages={5209 - 5224}
All organisms must interact with their environment, responding in behavioral, chemical, and other ways to various stimuli throughout their life cycles. Characterizing traits that directly represent an organism's ability to sense and react to their environment provides useful insight into the evolution of life-history strategies. One such trait for the nematode Pristionchus pacificus, chemosensation, is involved in navigation to beetle hosts. Essential for the survival of the nematode… 
A host beetle pheromone regulates development and behavior in the nematode Pristionchus pacificus
The data suggest that the beetle host pheromone may be a species-specific volatile synomone that co-evolved with necromeny, and a newly identified mutant, Ppa-obi-1, is used to reveal the molecular links between altered attraction towards the beetle phersomone, as well as hypersensitivity to its paralyzing effects.
Temperature-dependent changes in the host-seeking behaviors of parasitic nematodes
Temperature-dependent modulation of behavior may enable IJs to optimize host seeking in response to changing environmental conditions, and may play a previously unrecognized role in shaping the interactions of both beneficial and harmful parasitic nematodes with their hosts.
A species-specific nematocide that results in terminal embryogenesis
Insect-associated nematodes coordinate their development using host cues to ‘walk the line’ between mutualism and pathogenesis, and a host pheromone causes terminal embryogenesis by permeabilizing the nematode eggshell.
Regulation of hyperoxia-induced social behaviour in Pristionchus pacificus nematodes requires a novel cilia-mediated environmental input
A novel cilia-mediated environmental input adds an additional level of complexity to the regulation of hyperoxia-induced social behaviours in P. pacificus, a mechanism unknown in C. elegans.
The bacterial community of entomophilic nematodes and host beetles
The survey of nematode infestation profiles of scarab beetles in the greater Los Angeles area over a five‐year period and the conservation of Diplogastrid nematodes associations with Melolonthinae beetles and sulphate‐reducing bacteria suggests a possible link between beetle–bacterial communities and their associated nematises.
Travelling at a slug’s pace: possible invertebrate vectors of Caenorhabditis nematodes
Three invertebrate taxonomic groups represent potential vectors of Caenorhabditis nematodes and appear to have evolved specific adaptations to enter and persist in the harsh environment of slug intestines, possibly indicating first steps towards a parasitic life-style.
Succession and dynamics of Pristionchus nematodes and their microbiome during decomposition of Oryctes borbonicus on La Réunion Island
This study represents the first characterization of the dynamics of nematode-bacterial interactions during the decomposition of insects and finds that soil environments have the most diverse bacterial communities.
Environmental Variables Explain Genetic Structure in a Beetle-Associated Nematode
It is shown that significantly more genetic variation in P. pacificus populations is explained by environmental variation than by geographic distances, which supports a strong role for environmental heterogeneity vs. genetic drift in the divergence of populations, which is suggested may be influenced by adaptive forces.
Natural variation in cold tolerance in the nematode Pristionchus pacificus: the role of genotype and environment
Evidence of significant effects of genotype and environment on cold tolerance is found, and it is shown that, within the different Réunion locations sampled, all three phenotypic classes are generally well represented.


Chemoattraction in Pristionchus Nematodes and Implications for Insect Recognition
Natural variation in Pristionchus pacificus insect pheromone attraction involves the protein kinase EGL-4
The data strongly implicate egl-4 as one of several loci involved in behavioral variation in P. pacificus populations, and that EGL-4 homologs have been independently implicated for behavioral variations in other invertebrate models suggests that E GL-4 may act as a modulator for interspecies behavioral repertoires across large phylogenetic distances.
Natural variation in Pristionchus pacificus dauer formation reveals cross-preference rather than self-preference of nematode dauer pheromones
  • M. Mayer, R. Sommer
  • Biology
    Proceedings of the Royal Society B: Biological Sciences
  • 2011
It is suggested that strains may have evolved to induce dauer formation precociously in other strains in order to reduce the fitness of these strains, and intraspecific competition among genotypes is discussed as a previously unconsidered aspect of dauer Formation.
On the scent of speciation: the chemosensory system and its role in premating isolation
Genetic approaches to chemosensory gene families and to enzymes involved in biosynthetic pathways of signal compounds now provide new opportunities to dissect the genetic basis of these complex traits and of their divergence among taxa.
Molecular evolution and quantitative variation for chemosensory behaviour in the nematode genus Caenorhabditis
The results suggest that C. remanei may be a more suitable subject for ecological and evolutionary genetic studies than C. elegans, and shows that the G‐protein ODR‐3 plays an important role in chemosensory avoidance behaviour and identifies orthologues of odr‐3 in C. briggsae and C.Remanei.
Isolation of naturally associated bacteria of necromenic Pristionchus nematodes and fitness consequences
A continuum of bacterial interactions from dissemination, to reduction in brood size and nematode mortality caused by bacteria derived from insect hosts is shown, including the genetic manipulation of the interaction in both nematodes and bacteria.
Natural variation in the response of Caenorhabditis elegans towards Bacillus thuringiensis
W worm defence is indicated to be complex and variable across space, implying that parasites play an important role in the ecology of this species.
Quantitative Assessment of the Nematode Fauna Present on Geotrupes Dung Beetles Reveals Species-Rich Communities with a Heterogeneous Distribution
This study presents the first quantitative data on the Pristionchus spp.