1,721,004 research outputs found
Eutrophication and Nutrient Loading in Barnegat Bay: Initial Studies of the Importance of Sediment-Water Nutrient Interactions
No full textThis study is phase I of a longer-term project designed to address several information needs of the New Jersey Department of Environmental Protection. These needs include understanding: the role of sediments in controlling algal and seagrass production and possibly the occurrence of nuisance algal blooms, the ability of different areas of the Bay to assimilate nutrient loading, the factors controlling which nutrient, nitrogen or phosphorus, limits algal production in the Bay, the role that marinas play in nutrient loading to the Bay, and the importance of pulsed inputs of nutrients, such as from storm drains, to nutrient loading and eutrophication in the Bay. Sediments were chosen to study first because they are a major factor in controlling the availability and assimilation of nutrients in the Bay.Prepared by the Division of Environmental Research, Philadelphia Academy of Natural Sciences and submitted to the New Jersey Department of Environmental Protection.Purpose: To adapt and develop methods to investigate the importance of the sediments in Barnegat Bay as an internal source of and/or sink (removal site) for the nutrients nitrogen and phosphorus
Research Opportunities and Challenges in the Indian Ocean
No full textThe Indian Ocean is a dynamically complex and highly variable system, with circulation features and biogeochemical properties that are unusual in many respects. Yet the Indian Ocean (IO) remains one of the most undersampled and least understood of the world's ocean basins. In this article, we define several outstanding research questions that need to be addressed in the IO related to ocean currents and variability, the controls and fate of primary production, global change and anthropogenic impacts, and the role of higher trophic levels in ecological processes and biogeochemical cycles. We also discuss a unique opportunity that has recently arisen for staging research in the IO
Eutrophication and Nutrient Loading in Barnegat Bay: Sediment-Water Phosphorus Dynamics, Year III, Final Report
No full textWith funds from NJDEPE DSR, studies in Barnegat Bay were initiated in the summer of 1988 to (1) assess the current state of eutrophication in the Bay, and (2) investigate factors controlling nutrient availability in the Bay, and thus, eutrophication. Sediment-water nutrient [nitrogen (N) and phosphorus (P)] exchanges were the primary focus. The major conclusions were (1) Barnegat Bay is relatively eutrophic; (2) in contrast to larger, deeper estuaries, there is considerable benthic algal production in Barnegat Bay in addition to sea grass production; (3) unlike deeper estuaries, where the release of N and P are due to benthic decomposition of organic matter is an important source of nutrients for phytoplankton, the bottom sediments in Barnegat Bay retain considerable amounts of N and P produced in the sediments, making them an important factor regulating the degree of eutrophication by reducing the amount of N and P available for phytoplankton production.Prepared by the Division of Environmental Research, Philadelphia Academy of Natural Sciences and submitted to the New Jersey Department of Environmental Protection.Purpose: To assess the current state of eutrophication in the Bay, and investigate factors controlling nutrient availability in the Ba
Chemical Composition and Bioavailability of Dissolved Organic Nirtrogen in Atmosphereic Deposition
No full textThese presentation slides address the following questions: How much of the total dissolved nitrogen (TDN) is dissolved organic nitrogen (DON)? What are the sources of DON (natural, anthropogenic, photochemical)? And, what effect does atmospheric DON have on estuarine eutrophication?Purpose: To present results of a study on the chemical composition and bioavailability of dissolved organic nitrogen in atmospheric depositio
Chemical Composition and Bioavailability of Dissolved Organic Nitrogen in Atmospheric Wet Deposition from Urban and Rural New Jersey Sites - Final Report- December, 2005
No full textAtmospheric deposition is a major source of nitrogen to many ecosystems. Marked changes in both terrestrial and aquatic ecosystems are occurring as a result of increased nitrogen (N) deposition from anthropogenic sources. The specific objectives of the studies conducted were 1) to characterize the chemical composition of total dissolved nitrogen, both inorganic and organic, in atmospheric deposition in one urban and one relatively undisturbed site in New Jersey; 2) begin to identify sources of organic matter in atmospheric deposition at those sites; and 3) identify which of the organic compounds, and therefore which potential sources, are bioavailable and thus contributing to ecological changes in ecosystems.New Jersey Department of Environmental Protection (NJDEP) Contracts #SR01-079, SR02-021 and SR03-036Purpose: To present results from a study to determine the chemical composition of dissolved nitrogen and sources of organic matter in atmospheric deposition at 2 sites in New Jersey
Chemical Composition and Bioavailability of Dissolved Organic Nitrogen in Atmospheric Wet Deposition from Urban and Rural New Jersey Sites - Year 2- November 2000
No full textThe report attempts to characterize the chemical composition of total dissolved nitrogen, both inorganic and organic nitrogen, in atmospheric deposition in urban and relatively undisturbed sites in New Jersey. The report identifies potential sites of atmospheric nitrogen. The report identifies which of the compounds are bioavailable and thus contributing to ecological changes in ecosystems. The long-term goal is to identify the current, and potentially future, processes and technologies that are major contributors to atmospherically deposited organic-nitrogen compounds and to assess the effect of these specific chemicals on receptor ecosystems.This is a proposal for a research grant.Purpose: To study the effects of increased build up of atmospheric nitrogen on ecosystem
Eutrophication and Nutrient Loading in Barnegat Bay: N or P Limitation of Primary Production
No full textIn order to minimize continued degradation of water quality in Barnegat Bay, effective nutrient control strategies must be developed for the Bay watershed. To decrease current eutrophication levels and to minimize future nutrient loading to the Bay from increased development, we need to know which nutrient(s), N, P or both is (are) limiting phytoplankton production. Knowing which nutrient(s) to target to control eutrophication in the Bay will lead to the development of cost-effective management strategies.Prepared by the Division of Environmental Research, Philadelphia Academy of Natural Sciences and submitted to the New Jersey Department of Environmental Protection.Purpose: The current study was designed to provide information that would be useful in developing the most effective nutrient control strategies for Barnegat Bay to reduce future eutrophication
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Eutrophication and nutrient loading in Barnegat Bay :initial studies of the importance of sediment-water nutrient interactions : final report /principal investigator, Sybil P. Seitzinger ; co-investigator, Isabel E. Pilling.
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