Filters: Tags: Stable isotope analysis (X) > partyWithName: Amanda W Demopoulos (X)

Filters Date Range Past year (2) Past month (0) Past week (0) Past day (0) Custom range... To   Search Contacts U.S. Geological Survey - ScienceBase Wetland and Aquatic Research Center Ecosystems Mathew J Denton Jennifer P McClain Counts More... Categories Data (5) Tag Types Theme (5) Place (5) USGS Scientific Topic Keyword (4) Harvest Set (5) Tag Schemes None (5) ISO 19115 Topic Category (5) Marine Realms Information Bank (MRIB) keywords (3) USGS Thesaurus (2) Coastal and Marine Ecological Classification Standard (1) Marine Realms Information Bank (1) Alexandria Digital Library Feature Type Thesaurus (1) More... View Results as: JSON ATOM CSV

Stable isotope data and terrain variables for isoscape modeling around two submarine canyons in the western Atlantic sampled in 2012-2013 Terrain variables extracted from bathymetry were used in combination with stable isotope datasets to construct geospatially-explicit isoscapes that predicted variation in carbon and nitrogen isotopes across the canyon-slope seascape, providing insights into the distribution and flow of energy resources, relevant to understanding whole community function. Categories: Data; Tags: Aquatic Biology, Atlantic Ocean, Baltimore Canyon, Ecology, Norfolk Canyon, All tags... USGS Science Data Catalog (SDC), Virginia, biota, deep sea, environment, food web, isoscapes, oceans, stable isotope analysis, submarine canyon, Fewer tags Host feeding ecology and trophic position significantly influence isotopic discrimination between a generalist ectoparasite and its hosts: implications for parasite-host trophic studies Despite being one of the most prevalent forms of consumerism in ecological communities, parasitism has largely been excluded from food-web models. Stable isotope analysis of consumers and their diets has been widely used in the study of food-webs for decades. However, the amount of information regarding parasite stable isotope ecology is limited, restricting the ability of ecologists to use stable isotope analysis to study parasites in food-webs. This study took advantage of distinct differences in the feeding ecology and trophic position of different species of fish known to host the same common micropredatory gnathiid isopod, to study the effects of host stable isotope ecology on that of the associated micropredator.... Categories: Data; Tags: Eastern Caribbean, Ecology, Shallow/Mesophotic Coral Reef Biota, St John, United States Virgin Islands, Stable Isotopes, All tags... USGS Science Data Catalog (SDC), Virgin Islands of the United States, biota, coral reefs, food web, parasites, stable isotope analysis, symbiosis, Fewer tags Stable isotopic insights into Bathymodiolus childressi at two seeps in the U.S. Atlantic margin Chemosynthetic environments support distinct benthic communities capable of utilizing reduced chemical compounds for nutrition. Hundreds of methane seeps have been documented along the U.S. Atlantic margin (USAM), and detailed investigations at a few seeps have revealed distinct environments containing mussels, microbial mats, authigenic carbonates, and soft sediments. The dominant mussel Bathymodiolus childressi contains methanotrophic endosymbionts but is also capable of filter feeding. We used SIA (δ13C, δ 5N, and δ34S) and an isotope mixing model (MixSIAR) to estimate resource contribution to B. childressi and characterize food webs at two seep sites (Baltimore Seep: 400 m and Norfolk Seep: 1500 m depths) along... Categories: Data; Tags: Aquatic Biology, Atlantic Ocean, Baltimore Canyon, Ecology, Geochemistry, All tags... Norfolk Canyon, USGS Science Data Catalog (SDC), biota, ecology, environment, seep and vent ecosystems, stable isotope analysis, Fewer tags Food-web structure of canyon and slope associated fauna revealed by stable isotopes The primary objective of this study was to assess deepsea food web structure and trophic niches in Baltimore and Norfolk canyons, the adjacent slopes, and chemosynthetic seeps along the mid-Atlantic margin using stable isotope analyses (SIA) and isotope niche width analysis. We hypothesized that the isotopic compositions of canyon versus slope fauna would be distinct, given differences in the physics and chemistry of the canyons and slopes and resulting quality and quantity of the organic matter available to the benthos. These differences should be evident across taxa and among and within feeding groups. We also used SIA to estimate trophic positions of invertebrates and fishes and to examine changes in trophic... Categories: Data; Tags: Atlantic ocean, Baltimore canyon, USGS Science Data Catalog (SDC), biota, ecological competition, All tags... ecology, environment, food web, oceans, stable isotope analysis, submarine canyon, Fewer tags Stable isotope ratios of carbon and nitrogen from diamondback terrapins and resources within Southern Everglades and Key West National Wildlife Refuge, sampled 2012-2013 This study was initiated to provide baseline data and to determine the utility of stable isotope analysis to evaluate the foraging strategies of an opportunistic reptile predator. Stable isotope ratios of carbon and nitrogen were evaluated from multiple tissues from terrapin populations to determine spatial or temporal variations in resource use within mangrove habitats in Southern Florida. We sampled Diamondback terrapin (Malaclemys terrapin) and potential resources within mainland and island habitats, and evaluated their δ13C and δ15N values. We fit linear regression models to determine the best predictors of isotopic values for both terrapins and their prey, and SIBER analysis to examine terrapin isotopic niche... Categories: Data; Tags: Diamondback Terrapins, Ecology, Everglades National Park, Florida Keys National Wildlife Refuge, Genetics, All tags... Stable Isotope Analysis, USGS Science Data Catalog (SDC), Wildlife Biology, biota, Fewer tags