Sexual reproduction during diatom bloom.

Phytoplankton supports food webs in all aquatic ecosystems. Ecological studies highlighted the links between environmental variables and species successions . However, the role of life cycle characteristics on phytoplankton community dynamics remains poorly characterized.

Sediment archives reveal irreversible shifts in plankton communities after World War II and agricultural pollution.

To evaluate the stability and resilience of coastal ecosystem communities to perturbations that occurred during the Anthropocene, pre-industrial biodiversity baselines inferred from paleoarchives are needed. The study of ancient DNA (aDNA) from sediments (sedaDNA) has provided valuable information about past dynamics of microbial species and communities in relation to ecosystem variations. Shifts in planktonic protist communities might significantly affect marine ecosystems through cascading effects, and therefore the analysis of this compartment is essential for the assessment of ecosystem variations.

First Description of Alveolar Rhabdomyosarcoma of the Larynx in a Young Child.

Rhabdomyosarcoma of the larynx has been very rarely described in pediatric population. There are 3 histological subtypes: embryonal, pleomorphic, and alveolar. With regard to the English literature, we present the first case of alveolar rhabdomyosarcoma of the larynx ever described in a child.

Inter- and Intra-Specific Transcriptional and Phenotypic Responses of Pseudo-nitzschia under Different Nutrient Conditions.

Untangling the functional basis of divergence between closely related species is a step toward understanding species dynamics within communities at both the evolutionary and ecological scales. We investigated cellular (i.e.

Evolutionary processes and cellular functions underlying divergence in Alexandrium minutum.

Understanding divergence in the highly dispersive and seemingly homogeneous pelagic environment for organisms living as free drifters in the water column remains a challenge. Here, we analysed the transcriptome-wide mRNA sequences, as well as the morphology of 18 strains of Alexandrium minutum, a dinoflagellate responsible for harmful algal blooms worldwide, to investigate the functional bases of a divergence event. Analysis of the joint site frequency spectrum (JSFS) pointed towards an ancestral divergence in complete isolations followed by a secondary contact resulting in gene flow between the two diverging groups, but heterogeneous across sites.

Historical records from dated sediment cores reveal the multidecadal dynamic of the toxic dinoflagellate Alexandrium minutum in the Bay of Brest (France).

The multiannual dynamic of the cyst-forming and toxic marine dinoflagellate Alexandrium minutum was studied over a time scale of about 150 years by a paleoecological approach based on ancient DNA (aDNA) quantification and cyst revivification data obtained from two dated sediment cores of the Bay of Brest (Brittany, France). The first genetic traces of the species presence in the study area dated back to 1873 ± 6. Specific aDNA could be quantified by a newly developed real-time PCR assay in the upper core layers, in which the germination of the species (in up to 17-19-year-old sediments) was also obtained.

Rapid detection and quantification of the marine toxic algae, Alexandrium minutum, using a super-paramagnetic immunochromatographic strip test.

The dinoflagellates of Alexandrium genus are known to be producers of paralytic shellfish toxins that regularly impact the shellfish aquaculture industry and fisheries. Accurate detection of Alexandrium including Alexandrium minutum is crucial for environmental monitoring and sanitary issues. In this study, we firstly developed a quantitative lateral flow immunoassay (LFIA) using super-paramagnetic nanobeads for A.