Publications by authors named "Celine M O Reisser"
Article Synopsis
- Daphnia magna serves as a key model for studying host-parasite coevolution due to its interaction with microparasites, showing unique ecological and evolutionary traits compared to other arthropods like Drosophila.
- The study analyzed the genomes of 36 D. magna clones from Europe to investigate adaptive protein evolution, revealing high genetic diversity that is structured among populations but not as strongly adapted as seen in Drosophila.
- Findings indicate a prevalence of weakly deleterious genetic variants in D. magna, suggesting reduced selection effectiveness and emphasizing local adaptation instead of widespread adaptive fixation across its populations.
Connectivity affects species demography, (meta)population dynamics, evolution, phylogeny and biogeography. Various methodological approaches are applied to measure connectivity. Biophysical modelling can explore systematically the influence of atmospheric, oceanic and ecological forcing, while genetics measures connectivity patterns within the sampling strategy limit.
View Article and Find Full Text PDFToday, it is common knowledge that environmental factors can change the color of many animals. Studies have shown that the molecular mechanisms underlying such modifications could involve epigenetic factors. Since 2013, the pearl oyster var.
View Article and Find Full Text PDFIn French Polynesia, the production and exportation of black pearls through the aquaculture of the black-lip pearl oyster provide the second largest economic income for the country after tourism. This industry entirely relies on the collection of natural spats from few highly recruiting lagoons. In recent years, pearl oyster producers have experienced variable success rates in spat collection, with significant spatial and temporal variability in spat supply, driving uncertainty in the future of pearl production.
View Article and Find Full Text PDFGenetic sex determination (GSD) can evolve from environmental sex determination (ESD) via an intermediate state in which both coexist in the same population. Such mixed populations are found in the crustacean Daphnia magna, where non-male producers (NMP, genetically determined females) coexist with male producers (MP), in which male production is environmentally inducible and can also artificially be triggered by exposure to juvenile hormone. This makes Daphnia magna a rare model species for the study of evolutionary transitions from ESD to GSD.
View Article and Find Full Text PDFArticle Synopsis
- - The study focuses on a life cycle characterized by cyclic-parthenogenesis, which alternates between asexual and sexual reproduction, allowing for comparison of gene expression in genetically identical males and females.
- - Researchers found that 42% of annotated genes exhibited sex-biased expression, a rate consistent with estimates from other species, indicating that environmental sex determination does not reduce this bias.
- - A total of 707 ortholog genes showed consistent sex-biased expression across three species, with many involved in sex determination pathways, and notably, 75% of these genes were overexpressed in females.
Article Synopsis
- * Daphnia magna, a small freshwater crustacean, exhibits a unique case where a dominant female sex-determining locus exists alongside its typical ESD, mapping to a low-recombining region in its genome.
- * The identified genomic region, which functions similarly to a sex-related supergene and contains key genes for sex differentiation, may offer insights into the evolutionary processes behind the development of sex chromosomes.
Article Synopsis
- Many organisms have cryptic breeding systems that influence their ecology and evolution, making them hard to study through traditional observational methods.
- Genomic approaches, such as analyzing genetic transmission from parents to offspring, can help understand these systems, especially in cases like Daphnia magna where self-fertilization and automictic parthenogenesis are compared.
- This study confirms that offspring produced by automixis, primarily through terminal fusion, can be distinguished from those produced by self-fertilization using genome-wide heterozygosity data, highlighting the value of genomic techniques in revealing breeding mechanisms.
This article documents the addition of 473 microsatellite marker loci and 71 pairs of single-nucleotide polymorphism (SNP) sequencing primers to the Molecular Ecology Resources Database. Loci were developed for the following species: Barteria fistulosa, Bombus morio, Galaxias platei, Hematodinium perezi, Macrocentrus cingulum Brischke (a.k.
View Article and Find Full Text PDFThe Southern Ocean contains some of the most isolated islands on Earth, and fundamental questions remain regarding their colonization and the connectivity of their coastal biotas. Here, we conduct a genetic investigation into the Cellana strigilis (limpet) complex that was originally classified based on morphological characters into six subspecies, five of which are endemic to the New Zealand (NZ) subantarctic and Chatham islands (44-52°S). Previous genetic analyses of C.
View Article and Find Full Text PDFThe black surfperch Embiotoca jacksoni and the striped surfperch E. lateralis (Embiotocidae, Perciformes) are livebearing temperate reef fishes that live sympatrically over a large portion of their distribution range, where they exhibit strong ecological competition. In order to assess whether mating strategies reflect competition, we investigated multiple paternity in these two species in an area of sympatry.
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