Multi locus analysis of Pristionchus pacificus on La Réunion Island reveals an evolutionary history shaped by multiple introductions, constrained dispersal events and rare out‐crossing

@article{Morgan2012MultiLA,
  title={Multi locus analysis of Pristionchus pacificus on La R{\'e}union Island reveals an evolutionary history shaped by multiple introductions, constrained dispersal events and rare out‐crossing},
  author={Katy Morgan and Angela McGaughran and Laure Villate and Matthias Herrmann and Hanh Witte and Gabi Bartelmes and Jacques Rochat and Ralf J. Sommer},
  journal={Molecular Ecology},
  year={2012},
  volume={21}
}
Pristionchus pacificus, recently established as a model organism in evolutionary biology, is a cosmopolitan nematode that has a necromenic association with scarab beetles. The diverse array of host beetle species and habitat types occupied by P. pacificus make it a good model for investigating local adaptation to novel environments. Presence of P. pacificus on La Réunion Island, a young volcanic island with a dynamic geological history and a wide variety of ecozones, facilitates such… 
Landscape and oceanic barriers shape dispersal and population structure in the island nematode Pristionchus pacificus
Despite the biological importance and diversity of nematodes, little is known of the factors influencing their dispersal and shaping their evolutionary history. Populations of the cosmopolitan
Two New Species of Pristionchus (Nematoda: Diplogastridae) Support the Biogeographic Importance of Japan for the Evolution of the Genus Pristionchus and the Model System P. pacificus
TLDR
Two new species of Pristionchus are described, P. maxplancki and P. quartusdecimus, which were isolated from beetles in Japan, supporting the hypothesis that a region including Japan is the origin of diversification of the P. pacificus species complex.
Unraveling the evolutionary history of the nematode Pristionchus pacificus: from lineage diversification to island colonization
TLDR
This study comprehensively improves previous inferences about the evolutionary history of P. pacificus by employing model-based statistical methods and using a modeling-based approximate Bayesian computation approach to test hypotheses about the order and timing of establishment of the Réunion populations.
Characterization of Genetic Diversity in the Nematode Pristionchus pacificus from Population-Scale Resequencing Data
TLDR
It is concluded that purifying selection on many mutations with weak effects is a major force shaping genetic diversity in P. pacificus.
The nematode Pristionchus pacificus as a model system for integrative studies in evolutionary biology
TLDR
Recent attempts to establish the nematode Pristionchus pacificus as a model organism that allows integrative studies of development and evo‐devo, with ecology and population genetics are reviewed.
Molecular evolution and mutation accumulation lines in the nematode Pristionchus pacificus
TLDR
The combination of mutation rate analysis with intraspecific divergence provides a powerful tool for the reconstruction of the natural history of P. pacificus, and the ecological implication of these findings is discussed.
Environmental Variables Explain Genetic Structure in a Beetle-Associated Nematode
TLDR
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.
Genomic Profiles of Diversification and Genotype-Phenotype Association in Island Nematode Lineages.
TLDR
Taking a genome-wide association approach, this work functionally validate a significant genotype-phenotype association for pH tolerance in P. pacificus, which is undergoing heterogeneous genotypic and phenotypic diversification related to both evolutionary and environmental processes.
Two New Pristionchus Species (Nematoda: Diplogastridae) from Taiwan are Part of a Species-cluster Representing the Closest Known Relatives of the Model Organism P. pacificus.
TLDR
Two new species of Pristionchus are described, P. taiwanensis and P. occultus from Taiwan using morphology, morphometrics, mating experiments and genome- wide sequence analysis, both of which are gonochorists and they are morphologically indistinguishable from P. pacificus.
Variation in rates of spontaneous male production within the nematode species Pristionchus pacificus supports an adaptive role for males and outcrossing
TLDR
Elevated rates of laboratory male generation appear to occur under environmental conditions which differ from those experienced by populations in nature, which may result in higher outcrossing rates, hence driving increased effective recombination and the creation of potentially adaptive novel allelic combinations.
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