scholarly journals Climatic influences on riverine nitrate flux: Implications for coastal marine eutrophication and hypoxia

Estuaries ◽  
2003 ◽  
Vol 26 (1) ◽  
pp. 1-11 ◽  
Author(s):  
Dubravko Justić ◽  
R. Eugene Turner ◽  
Nancy N. Rabalais
Keyword(s):  
Coastal Marine ◽  
Marine Eutrophication ◽  
Nitrate Flux

scholarly journals Presence of Nitrate-Accumulating Sulfur Bacteria and Their Influence on Nitrogen Cycling in a Shallow Coastal Marine Sediment

2001 ◽  
Vol 67 (8) ◽  
pp. 3481-3487 ◽  
Author(s):  
Mikio Sayama
Keyword(s):  
Nitrate Concentration ◽  
Sediment Cores ◽  
Tokyo Bay ◽  
Sulfur Bacteria ◽  
Coastal Marine ◽  
Denitrification Activity ◽  
Coastal Marine Sediment ◽  
Nitrate Flux ◽  
Sediment Denitrification

ABSTRACT Nitrate flux between sediment and water, nitrate concentration profile at the sediment-water interface, and in situ sediment denitrification activity were measured seasonally at the innermost part of Tokyo Bay, Japan. For the determination of sediment nitrate concentration, undisturbed sediment cores were sectioned into 5-mm depth intervals and each segment was stored frozen at −30°C. The nitrate concentration was determined for the supernatants after centrifuging the frozen and thawed sediments. Nitrate in the uppermost sediment showed a remarkable seasonal change, and its seasonal maximum of up to 400 μM was found in October. The directions of the diffusive nitrate fluxes predicted from the interfacial concentration gradients were out of the sediment throughout the year. In contrast, the directions of the total nitrate fluxes measured by the whole-core incubation were into the sediment at all seasons. This contradiction between directions indicates that a large part of the nitrate pool extracted from the frozen surface sediments is not a pore water constituent, and preliminary examinations demonstrated that the nitrate was contained in the intracellular vacuoles of filamentous sulfur bacteria dwelling on or in the surface sediment. Based on the comparison between in situ sediment denitrification activity and total nitrate flux, it is suggested that intracellular nitrate cannot be directly utilized by sediment denitrification, and the probable fate of the intracellular nitrate is hypothesized to be dissimilatory reduction to ammonium. The presence of nitrate-accumulating sulfur bacteria therefore may lower nature's self-purification capacity (denitrification) and exacerbate eutrophication in shallow coastal marine environments.

STRUKTUR KOMUNITAS MAKRO ALGA DI PESISIR PULAU KECAMATAN BULANG

SIMBIOSA ◽  
2014 ◽  
Vol 3 (2) ◽  
Author(s):  
Notowinarto Notowinarto ◽  
Ramses Ramses ◽  
Mulhairi Mulhairi
Keyword(s):  
Community Structure ◽  
Diversity Index ◽  
Algal Species ◽  
Algal Communities ◽  
Marine Life ◽  
Ph Values ◽  
Abundance Patterns ◽  
Coastal Marine ◽  
Temperature Parameter ◽  
Important Value Index

Bulang districts Batam Islands of  Riau province (Riau Islands), its consists of many islands with as well as having the potential diversity of coastal marine life in particular kinds of macro algae or seaweed. Conducted research aimed to determine the structure of macro- algal communities in the intertidal zone islands. The results of the identification of algal species found 16 species are: the Order of Chlorophyceae as 6 spesies; Order Phaeophyceae as 2 spesies; and Order Rhodophyceae as 8 spesies. The community structure at the five stations showed the highest values were found in the island of dominance Cicir (D ' = 0.79) , uniformity index values on Tengah Island (E ' = 0.99) , while the island Balak had the highest diversity index (H ' = 0.88) , with the abundance patterns of population structure on the island is pretty good Central . Results of correlation analysis of regression between IVI types of algae with the conditions of environmental quality suggests that there is a significance (Fhit ˃ F table and the value of r = > 90 %) between IVI algae Halimeda sp and Cryptarachne polyglandulosa at each station with a temperature parameter surface (⁰C) , depth temperature (⁰C) and pH values. Keywords : Algae, Community Structure, Important Value Index.

Coastal marine and in-river migration behaviour of adult sockeye salmon en route to spawning grounds

2014 ◽  
Vol 496 ◽  
pp. 71-84 ◽  
Author(s):  
SM Wilson ◽  
SG Hinch ◽  
SM Drenner ◽  
EG Martins ◽  
NB Furey ◽  
...  
Keyword(s):  
Sockeye Salmon ◽  
Spawning Grounds ◽  
Migration Behaviour ◽  
Coastal Marine ◽  
River Migration

Applicability of management guidelines for surfing resources in California

Shore & Beach ◽  
2020 ◽  
pp. 53-64
Author(s):  
Edward Atkin ◽  
Dan Reineman ◽  
Jesse Reiblich ◽  
David Revell
Keyword(s):  
New Zealand ◽  
National Level ◽  
State Level ◽  
The United States ◽  
Management Guidelines ◽  
For Profit ◽  
Aotearoa New Zealand ◽  
Coastal Marine ◽  
Management Measures ◽  
Legal Frameworks

Surf breaks are finite, valuable, and vulnerable natural resources, that not only influence community and cultural identities, but are a source of revenue and provide a range of health benefits. Despite these values, surf breaks largely lack recognition as coastal resources and therefore the associated management measures required to maintain them. Some countries, especially those endowed with high-quality surf breaks and where the sport of surfing is accepted as mainstream, have recognized the value of surfing resources and have specific policies for their conservation. In Aotearoa New Zealand surf breaks are included within national environmental policy. Aotearoa New Zealand has recently produced Management Guidelines for Surfing Resources (MGSR), which were developed in conjunction with universities, regional authorities, not-for-profit entities, and government agencies. The MGSR provide recommendations for both consenting authorities and those wishing to undertake activities in the coastal marine area, as well as tools and techniques to aid in the management of surfing resources. While the MGSR are firmly aligned with Aotearoa New Zealand’s cultural and legal frameworks, much of their content is applicable to surf breaks worldwide. In the United States, there are several national-level and state-level statutes that are generally relevant to various aspects of surfing resources, but there is no law or policy that directly addresses them. This paper describes the MGSR, considers California’s existing governance frameworks, and examines the potential benefits of adapting and expanding the MGSR in this state.

Remote Sensing and Prediction of the Coastal Marine Boundary Layer

2001 ◽  
Author(s):  
Brian H. Fiedler ◽  
Yefim Kogan ◽  
Alan Shapiro ◽  
Vince Wong ◽  
Joshua Wurman
Keyword(s):  
Remote Sensing ◽  
Boundary Layer ◽  
Marine Boundary Layer ◽  
Coastal Marine
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