Filters: Tags: seep (X) > partyWithName: U.S. Geological Survey - ScienceBase (X)
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These are metadata related to the collection of samples on the FK190612 research expedition in the north Pacific Ocean along the Cascadia margin in June 2019. Samples were collected to examine characteristics of methane emissions from seafloor seeps at the edge of hydrate stability and the associated communities.
These data represent several benthic cores collected near chemosynthetic seep habitats during 2009 and 2012. Sediment cores were collected near several natural hydrocarbon seeps with ROV deployed push cores. The purpose of these samples is to examine benthic communities associated with natural hydrocarbon seepage in the deep sea as well as compare these communities to areas associated with the Deepwater Horizon oil blowout. Samples were collected in the northern Gulf of Mexico, mostly south of Louisiana, and at depths ranging from 500 to 2600 meters. Sample processing and species identification occurred from 2014 – 2016. Macrofauna (>300 um) were identified to the lowest taxonomic unit.
Categories: Data;
Types: Citation;
Tags: Gulf of Mexico,
USGS Science Data Catalog (SDC),
biota,
chemosynthetic,
macrofauna,
The National Hydrography Dataset (NHD) High Resolution flowlines were used as a base to provide additional information on the connectivity of the stream network for the hydrographic basins in and around Montana. In addition to the attributes that are published as part of the NHD data, two fields were added to the attribute table to associate streams that do not have a Geographic Names Information System (GNIS) name with the GNIS name and NHD reachcode of the nearest downstream named flowline. The National Hydrography Dataset (NHD) is a feature-based database that interconnects and uniquely identifies the stream segments or reaches that make up the nation's surface water drainage system. NHD data were originally...
Types: Map Service,
OGC WFS Layer,
OGC WMS Layer,
OGC WMS Service;
Tags: Geography,
Idaho,
Information Sciences,
MSDI,
Montana,
Bottom simulating reflections (BSRs) are seismic features that are imaged in marine sediments using high-energy, impulsive seismic sources such as air guns or generator-injector guns. BSRs often cut across sediment stratigraphy and are interpreted as marking the deepest depth at which gas hydrate can exist. Gas hydrate is a naturally occurring and widely distributed frozen form of water and gas (usually methane) stable at low temperatures (up to about 25 degrees Celsius [°C]) and intermediate pressures (those that usually correspond to greater than 500 meters water depth). BSRs have been mapped in all the world’s oceans, in inland seas (such as the Black Sea), and in Lake Baikal in Russia. This data release consists...
Categories: Data;
Types: Map Service,
OGC WFS Layer,
OGC WMS Layer,
OGC WMS Service;
Tags: Alaska,
Amazonia,
Antarctica,
Arctic,
Argentina,
Submarine canyons are morphologically complex systems, acting as major conduits of organic matter along continental shelves, promoting gradients in food resources, habitat heterogeneity, and areas of sediment resuspension and deposition. Often environmental conditions within canyons can be highly distinct, particularly in different parts of the canyon and in contrast to adjacent slopes. Here we examine how biogeochemical drivers shape the differences between canyon and slope infaunal communities in Baltimore and Norfolk Canyons in the U.S. Mid-Atlantic Region. Specific comparisons included macrofaunal communities in Norfolk canyons and adjacent slope, hard substrate associated macrofaunal communities in Norfolk...
Categories: Data;
Types: Citation;
Tags: Atlantic Ocean,
Baltimore Canyon,
Benthos,
Meiobenthos,
Norfolk Canyon,
Chemosynthetic ecosystems in the Gulf of Mexico (GOM) support dense communities of seep megafaunal invertebrates that rely on endosymbiotic bacteria for nutrition. Distinct infaunal communities are associated with the biogenic habitats created by seep biota, where habitat heterogeneity and sediment geochemistry influence local macrofaunal community structure. Here we examine the variance in infaunal communities in the GOM with respect to depth, sediment geochemistry parameters, and distance to known seep habitats. Habitats were mapped based on ROV video of the seafloor. Samples were collected from three sites (AC601, GC852, and AT340) via box core in 2007 and processed for macrofauna and environmental characteristics....
Categories: Data;
Tags: Benthos,
Gulf of Mexico,
USGS Science Data Catalog (SDC),
biota,
chemosynthetic,
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