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Machine Learning Assessment of Dredging Impacts on the Phytoplankton Community on the Brazilian Equatorial Margin: A Multivariate Analysis.
Environ Pollut
January 2025
Federal Institute of Maranhão, Campus Barreirinhas, Rodovia MA-225, KM 04, CEP:65590-000, Barreirinhas, Maranhão, Brazil.
Dredging in estuarine systems significantly impacts phytoplankton communities, with suspended particulate matter (SPM) and dissolved aluminum (Al) serving as indicators of disturbance intensity. This study assessed the effects of dredging in the São Marcos Estuarine Complex (SMEC), Brazil, over three distinct events (2015, 2017, 2020), involving varying sediment volumes and climatic influences. Prolonged dredging operations and increased sediment volumes led to a pronounced 43.
View Article and Find Full Text PDFMicroalgal biofilm induces larval settlement in the model marine worm .
R Soc Open Sci
September 2024
University of Exeter, Biosciences, Faculty of Health and Life Sciences, Streatham Campus, Exeter EX4 4QD, UK.
A free-swimming larval stage features in many marine invertebrate life cycles. To transition to a seafloor-dwelling juvenile stage, larvae need to settle out of the plankton, guided by specific environmental cues that lead them to an ideal habitat for their future life on the seafloor. Although the marine annelid has been cultured in research laboratories since the 1950s and has a free-swimming larval stage, specific environmental cues that induce settlement in this nereid worm are yet to be identified.
View Article and Find Full Text PDFIntracellular morphogenesis of diatom silica is guided by local variations in membrane curvature.
Nat Commun
September 2024
Department of Plant and Environmental Sciences, Weizmann Institute of Science, Rehovot, Israel.
Silica cell-wall formation in diatoms is a showcase for the ability of organisms to control inorganic mineralization. The process of silicification by these unicellular algae is tightly regulated within a membrane-bound organelle, the silica deposition vesicle (SDV). Two opposing scenarios were proposed to explain the tight regulation of this intracellular process: a template-mediated process that relies on preformed scaffolds, or a template-independent self-assembly process.
View Article and Find Full Text PDFPhylogenetic proximity drives temporal succession of marine giant viruses in a five-year metagenomic time-series.
bioRxiv
August 2024
Department of Biological Sciences, University of Southern California, Los Angeles, California, USA.
Nucleocytoplasmic Large DNA Viruses (NCLDVs, also called giant viruses) are widespread in marine systems and infect a broad range of microbial eukaryotes (protists). Recent biogeographic work has provided global snapshots of NCLDV diversity and community composition across the world's oceans, yet little information exists about the guiding 'rules' underpinning their community dynamics over time. We leveraged a five-year monthly metagenomic time-series to quantify the community composition of NCLDVs off the coast of Southern California and characterize these populations' temporal dynamics.
View Article and Find Full Text PDFEnhancing Acetate Utilization in through the Introduction of Acetate Transport Protein.
Biomolecules
July 2024
School of Life Sciences, Ludong University, Yantai 264025, China.
The diatom , known for its high triacylglycerol (TAG) content and significant levels of n-3 long chain polyunsaturated fatty acids (LC-PUFAs), such as eicosapentaenoic acid (EPA), has a limited ability to utilize exogenous organic matter. This study investigates the enhancement of acetate utilization in by introducing an exogenous acetate transport protein. The acetate transporter gene from endowed the organism with the capability to assimilate acetate and accelerating its growth.
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