Rich diversity and active spatial-temporal dynamics of species revealed by time-series metabarcoding analysis.

is a species-rich genus in that not only contributes positively as primary producer, but also poses negative impacts on ecosystems by causing harmful algal blooms. Although taxonomical studies have identified a large number of species, however, the composition of species and their geographical distribution in marine ecosystems were not well understood due primarily to the lack of resolution of morphology-based approaches used previously in ecological expeditions. In this study, we systematically analyzed the composition and spatial-temporal dynamic distributions of in the model marine ecosystem Jiaozhou Bay by applying metabarcoding analysis.

Composition and spatial-temporal dynamics of phytoplankton community shaped by environmental selection and interactions in the Jiaozhou Bay.

The Jiaozhou Bay as a model marine ecosystem in China has been intensively investigated over the last 90 years. However, detailed phytoplankton community composition, spatial-temporal dynamics, and its assembly mechanism were still unclear. To address these, we systematically examined the composition and spatial-temporal dynamics of phytoplankton in the Jiaozhou Bay through high-throughput sequencing of 18S rDNA V4.

Comparative Analysis of Chloroplast Genomes of Seven Species Revealed Variation Hotspots and Speciation Time.

is a species-rich diatom genus with broad distribution and plays an important role in global carbon cycle and aquatic ecosystems. However, genomic information of species is limited, hindering advanced researches on biodiversity and their differential impact on ecology. In this study, we constructed full-length chloroplast genomes (cpDNAs) for seven species, including , , , , , , and .

Complete mitochondrial genome of the harmful algal bloom species (Bacillariophyceae, Bacillariophyta).

is an important genus of diatoms with many species capable of inducing harmful algae blooms (HABs) in coastal and oceanic waters, some of which produce the toxin domoic acid (DA), a neurotoxin that causes amnesic shellfish poisoning (ASP). is a cosmopolitan species that can induce HABs and produce DA. Nevertheless, mitochondrial genome of has not been revealed.

Reconstruction of the evolutionary biogeography reveal the origins and diversification of oysters (Bivalvia: Ostreidae).

Oysters (Bivalvia: Ostreidae Rafinesque, 1815) live in the intertidal and shallow subtidal areas worldwide. Despite their long evolutionary histories, abundant fossil records, global distribution, and ecological significance, a systematic time-dependent biogeographical analysis of this family is still lacking. Using combined mitochondrial (COI and 16S rRNA) and nuclear (18S rRNA, 28S rRNA, H3 and ITS2) gene makers for 80% (70/88) of the recognized extant Ostreidae, we reconstructed the global phylogenetic and biogeographical relationships throughout the evolutionary history of oysters.

Complete chloroplast genome of (Mediophyceae, Bacillariophyta).

The cosmopolitan phytoplankton species Ehrenberg 1839 is a common harmful algal bloom (HAB) species with significant negative ecological impact. However, molecular information for this HAB species is limited. In this study, the complete chloroplast genome (cpDNA) of was constructed for the first time.

Mitochondrial genome and phylogenomic analysis of (Bacillariophyceae, Bacillariophyta).

The number of species in the genus has increased to 56, including 26 species known to produce domoic acid (DA), which is harmful to marine animals and human health. The lack of genomic sequences of species has been a limiting factor in the studies of genetic and evolutionary relationships of species. Here, the complete mitochondrial genome sequence of was determined for the first time, which was 38,792 bp in length with the overall AT content being 69.

Definition of a High-Resolution Molecular Marker for Tracking the Genetic Diversity of the Harmful Algal Species Through Comparative Analysis of Mitochondrial Genomes.

The cosmopolitan phytoplankton species is a common harmful algal bloom (HAB) species that have been found to cause HABs in essentially all coastal regions except the Polar regions. However, molecular information for this HAB species is limited with only a few molecular markers. In this project, we constructed the mitochondrial genome (mtDNA) of , which was also the first mtDNA constructed for any species in the order Hemiaulales that includes 145 reported species (including two additional HAB species and ).

Metabarcoding analysis of harmful algal species in Jiaozhou Bay.

Accurate detection of the composition and dynamics of harmful algal bloom (HAB) species is critical for studying the mechanisms of HAB formation and for developing means for predicting the occurrences of HABs. Jiaozhou Bay is an epitome of China's coastal ecosystem and an ideal site for HAB research with the accumulation of decades of historical investigation records. Nevertheless, most of these earlier studies on phytoplankton communities applied primarily morphology-based approaches with limited resolution in phytoplankton species identification, especially for those with small-sized cells and for cryptic species.