Dramatic changes occurred in Narragansett Bay during the 1980s: water clarity increased, while phytoplankton abundance and chlorophyll concentration decreased. We examine how changes in total suspended solids (TSS) loading from wastewater treatment plants may have influenced this decline in phytoplankton chlorophyll. TSS loading, light and phytoplankton observations were compiled and a light- and temperature-dependent Skeletonema-based phytoplankton growth model was applied to evaluate chlorophyll supported by TSS nitrogen during 1983-1995. TSS loading declined 75% from ~0.60×10(6)kgmonth(-1) to ~0.15×10(6)kgmonth(-1) during 1983-1995. Model results indicate that nitrogen reduction related to TSS reduction was minor and explained a small fraction (~15%) of the long-term chlorophyll decline. The decline in NBay TSS loading appears to have increased water clarity and in situ irradiance and contributed to the long-term chlorophyll decline by inducing a physiological response of a ~20% reduction in chlorophyll per cell.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1016/j.marpolbul.2016.04.004 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Purpose: This study aimed to compare the biomechanical properties of four meniscal suture configurations-two simple sutures (TSS), two cinch sutures, a locking loop stitch (LLS), and a delta-grip stitch (DGS)-for transtibial pullout repair of medial meniscus posterior root tears (MMPRTs) using porcine menisci.
Methods: Forty porcine menisci were randomly assigned to each suture configuration with all-inside repair. All specimens were subjected to cyclic loading for 1000 cycles, followed by a load-to-failure test.
Enhancing prediction and inference of daily in-stream nutrient and sediment concentrations using an extreme gradient boosting based water quality estimation tool - XGBest.
Sci Total Environ
January 2025
Office of Research and Development, United States Environmental Protection Agency, Athens, GA, USA.
Estimating constituent loads in streams and rivers is a crucial but challenging task due to low-frequency sampling in most watersheds. While predictive modeling can augment sparsely sampled water quality data, it can be challenging due to the complex and multifaceted interactions between several sub-watershed eco-hydrological processes. Traditional water quality prediction models, typically calibrated for individual sites, struggle to fully capture these interactions.
View Article and Find Full Text PDFGreen coagulation and flocculation: Scenedesmus algal extract-loaded chitosan/poly(vinyl alcohol) cryogel for effective water treatment.
Int J Biol Macromol
December 2024
Department of Chemistry, Faculty of Science, University of Tabuk, Tabuk 71491, Saudi Arabia.
This study presents an eco-friendly approach to treat contaminated and turbid water through the development of cryogels loaded with bioactive compounds derived from Scenedesmus algal extract (ScAE) based on chitosan/poly(vinyl alcohol) (Cs/PVA) matrix. Scenedesmus sp., a green microalga known for its bioactive properties, was cultivated and processed to obtain extracts with coagulation potential.
View Article and Find Full Text PDFBiomechanical assessment of anterior plate system, bilateral pedicle screw and transdiscal screw system for high-grade spondylolisthesis: a finite element study.
Front Bioeng Biotechnol
November 2024
Department of Neurosurgery, Marcus Neuroscience Institute, Boca Raton Regional Hospital, Boca Raton, FL, United States.
Article Synopsis
- The study investigates the biomechanical effects of different internal fixation techniques for high-grade L5-S1 spondylolisthesis, focusing on how stiffness and hardware stress impact outcomes.
- A finite element model of the lumbar spine was created to simulate high-grade spondylolisthesis and assess three treatment methods: anterior plate system (APS), bilateral pedicle screw system (BPSS), and transdiscal screw system (TSS).
- Results showed that while all treatments reduced range of motion, TSS had the best resistance to shear forces and lower internal fixation stress, although it increased stress on the adjacent annulus compared to APS and BPSS.
Stormwater treatment in constrained urban spaces through a hybrid Sequential Sedimentation Biofiltration System.
Chemosphere
November 2024
University of Lodz, Faculty of Biology and Environmental Protection, UNESCO Chair on Ecohydrology and Applied Ecology, Banacha 12/16, 90-237, Lodz, Poland.
Article Synopsis
- Urban areas are under pressure for better water management, and Nature-based Solutions (NbS) can help, but integrating them with existing systems is often challenging.
- This study introduces a Sequential Sedimentation Biofiltration System (SSBS) for stormwater treatment that integrates a sedimentation tank, Permeable Reactive Barriers (PRBs), and a biofiltration zone to enhance water quality in tight urban spaces.
- Although sediment removal was limited, PRBs effectively reduced ammonium and phosphate levels, while the biofiltration zone further improved nutrient retention, highlighting the promise of combining NbS with traditional urban infrastructure for better stormwater management.
Want AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!