Publications by authors named "D R Ralston"
Article Synopsis
- Estuaries connect land and ocean, influencing the movement of buoyant materials like plastics and organic matter through complex interactions of river and tidal flows.
- The study uses simulations and theoretical models to show that tidal currents can retain buoyant particles in estuaries, especially in smaller ones, contrary to the common belief that they mainly flow out to the ocean.
- Factors such as the width of the estuary and river flow rates significantly impact the retention and export of these materials, helping to predict their behavior in land-sea exchange processes.
In 2016, an unprecedented Pseudo-nitzschia australis bloom in the Gulf of Maine led to the first shellfishery closures due to domoic acid in the region's history. In this paper, potential introduction routes of are explored through observations, a hydrodynamic model, and a Lagrangian particle tracking model. Based on particle tracking experiments, the most likely source of to the Gulf of Maine was the Scotian Shelf.
View Article and Find Full Text PDFWorldwide, warming ocean temperatures have contributed to extreme harmful algal bloom events and shifts in phytoplankton species composition. In 2016 in the Gulf of Maine (GOM), an unprecedented bloom led to the first domoic-acid induced shellfishery closures in the region. Potential links between climate change, warming temperatures, and the GOM assemblage, however, remain unexplored.
View Article and Find Full Text PDFObjectives: Immediate recognition of out-of-hospital cardiac arrest (OHCA) by Emergency Medical Dispatch (EMD) operators is crucial to facilitate timely initiation of telephone cardiopulmonary resuscitation (T-CPR) and to enable the appropriate level of Emergency Medical Services (EMS) response. The goal of this study was to identify patterns that can increase EMD-level recognition of cardiac arrests prior to EMS arrival.
Methods: The Combined Communications Center in Alachua County, Florida provided audio recordings of all emergency calls from January 1, 2018 to November 16, 2018 dispatched as a chief complaint other than OHCA, but later identified as cardiac arrest.