Download or read book Organic Composition of Sediment in Two Bays with Fringing Coral Reefs in St John U S Virgin Islands written by Trish Volle Narwold and published by . This book was released on 2009 with total page 390 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Effect of Watershed Runoff and Sediment Resuspension on Turbidity and Sediment Deposition in St John US Virgin Islands written by Stephen E. Campbell and published by . This book was released on 2017 with total page 98 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the US Virgin Islands (USVI), land-based (terrigenous) sedimentation has been identified as a major cause of coral stress. Development, such as the building of unpaved roads in steep coastal watersheds, has increased sediment yields and marine terrigenous sedimentation by up to an order of magnitude above background levels. When activated during storm events, ephemeral streams transport sediment from the watershed to coastal waters. Once deposited on the seafloor, resuspension of benthic sediments can further increase turbidity and deposition. However, isolating the relative contributions of runoff and resuspension to turbidity and deposition using conventional sediment trap monitoring has been challenging. Here we describe the spatial and temporal variability of marine sediment dynamics in response to runoff and resuspension events in St. John, USVI. Between late July 2013 and January 2014, nephelometers were deployed at three reef and five shoreline sites next to ephemeral stream outfalls equipped with a water level sensor (10-min resolution) and peak crest gauges (~13-day resolution). At each instrument site, benthic sediment samples were collected every ~26 days. While runoff events resulted in high-magnitude spikes in turbidity and deposition, which were up to 900 and 17,000 times background, respectively, they were short-lived (hours). Resuspension-induced spikes in turbidity and deposition were lower in magnitude but of longer duration (days-weeks), particularly at sites with finer-grained benthic sediments, and were associated with increased wave height during low tides. While the relative contribution of runoff and resuspension to turbidity and deposition were spatially variable between our study sites, resuspension contributed at least 7 times more to turbidity and 3 times more to deposition than runoff during the 2013 rainy season at one of our coastal marine monitoring sites. Though previous studies have measured marine sedimentation over months-centuries in St. John, no studies have monitored turbidity or the relative contributions to turbidity and deposition from runoff and resuspension at the time scale of minutes-days. Understanding the relative contribution of runoff vs. resuspension to marine turbidity and deposition is important to effectively manage land-based sedimentation, marine development, as well as evaluate the effectiveness of watershed restoration programs which aim to reduce marine terrigenous sedimentation.
Download or read book Grain Size Analysis of the Watershed and Nearshore Coastal Sediments in Coral Bay St John U S Virgin Islands written by Thomas A. Copeland and published by . This book was released on 2016 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Coral Reefs of the World Atlantic and Eastern Pacific written by and published by . This book was released on 1988 with total page 426 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Coral Reefs of the World written by Sue Wells and published by Columbia University Press. This book was released on 1988 with total page 432 pages. Available in PDF, EPUB and Kindle. Book excerpt: A broad survey of the coral reefs of the world over three volumes, intended to establish priorities for reef conservation. The review includes distribution, conservation status, legislation, recommendations and accounts of sites of scientific interest.
Download or read book Coral Bay Sediment Deposition and Reef Assessment Study written by Barry Devine and published by . This book was released on 2003 with total page 110 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This study has investigated the sediment deposition history of Coral Bay, St. John, USVI, and the surrounding waters where sediment is being deposited, the rate of sedimentation and when the sediment deposition rate increase began."--P. 7.
Download or read book Ecozonation and Sediment Distribution of Three Reef Areas on St John U S Virgin Islands written by Charles T. Feazel and published by . This book was released on 1981 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book What s in the Sand Caribbean Reef Sediment as an Analog of the Living Community written by Sunday Siomades and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Reef sediment provides a potential archive of reef health and ecosystem evolution across expanded timescales, but the relationship between living reef communities and the sediment they produce is poorly constrained. Previous studies evaluating modern reef diversity and health are limited by shifting ecological baselines, and studies that employ fossilized reefs to evaluate community diversity in deep time are influenced by taphonomic bias. To examine reef biology over a time period less influenced by these constraints, this study compared the composition of modern reef sediment to a biological census of the living reef community to assess the potential for reef sediment to record living reef communities. Two types of data were collected from nearshore reefs on St. John, USVI: echinoid subfossils in surficial reef sediments, and transect images of the reef bodies (in which an average number of visible echinoids per photo was calculated). A Spearman correlation was used to determine the strength of the relationship between the abundance of echinoid subfossils and the abundance of live echinoids across three different near-shore reefs; calculated r values ranged from 1 to 0.5 (strong to moderate correlation). These results suggest that live measures of population density may correlate to the abundance of subfossil fragments apparent in reef sediment, and that the sediment record is sensitive to even geologically recent population changes.
Download or read book Ecozonation and Sediment Distribution of Three Reef Areas on St John U S Virgin Islands written by Charles T. Feazel and published by . This book was released on 1975 with total page 448 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Sediment Transport and CaCO3 Budget on a Fringing Reef Cane Bay St Croix U S Virgin Islands written by James Lester Sadd and published by . This book was released on 1984 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: States that in the U.S. Virgin Islands, population and tourist industry growth has badly depleted sand and gravel resources for use as building aggregate, that led to a search of the island shelves for new resources and sand being identified as the most accessible. However, the beaches are a valuable recreational resource, a habitat for endangered species, and as an aesthetic natural environment worth preserving. Points to the need for an understanding of carbonate sediment production, accumulation and transport that may prove valuable in future decisions regarding offshore sand mining as practiced in some islands.
Download or read book Encyclopedia of Modern Coral Reefs written by David Hopley and published by Springer Science & Business Media. This book was released on 2010-11-26 with total page 1226 pages. Available in PDF, EPUB and Kindle. Book excerpt: Coral reefs are the largest landforms built by plants and animals. Their study therefore incorporates a wide range of disciplines. This encyclopedia approaches coral reefs from an earth science perspective, concentrating especially on modern reefs. Currently coral reefs are under high stress, most prominently from climate change with changes to water temperature, sea level and ocean acidification particularly damaging. Modern reefs have evolved through the massive environmental changes of the Quaternary with long periods of exposure during glacially lowered sea level periods and short periods of interglacial growth. The entries in this encyclopedia condense the large amount of work carried out since Charles Darwin first attempted to understand reef evolution. Leading authorities from many countries have contributed to the entries covering areas of geology, geography and ecology, providing comprehensive access to the most up-to-date research on the structure, form and processes operating on Quaternary coral reefs.
Download or read book Sedimentation in Coastal Bays with Coral Reefs written by Megan LaDonna Kolupski and published by . This book was released on 2011 with total page 506 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Aquatic Sciences and Fisheries Abstracts written by and published by . This book was released on 1988 with total page 762 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Sedimentation and Reef Development in Hawksnest Fish and Reef Bays St John U S Virgin Islands written by Dennis K. Hubbard and published by . This book was released on 1987 with total page 99 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Baseline Assessment of Fish and Coral Bays St John U S Virgin Islands in Support of Watershed Restoration Activities written by Charles William Menza and published by . This book was released on 2012 with total page 29 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Sediment transport in a fringing reef Cane Bay St Croix United States Virgin Islands written by James Lester Sadd and published by . This book was released on 1980 with total page 234 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Sediment water Coupling in Permeable Shallow Water Sediments written by Christian Wild and published by . This book was released on 2004 with total page 182 pages. Available in PDF, EPUB and Kindle. Book excerpt:
