scholarly journals BENTHIC NUTRIENT FLUXES ACROSS A PRODUCTIVE SHELF ADJACENT TO AN OLIGOTROPHIC BASIN: CASE OF THE NORTHEASTERN MEDITERRANEAN SEA

2021 ◽  
Author(s):  
Ismail Akcay ◽  
Suleyman Tugrul ◽  
Mustafa Yücel
Keyword(s):  
Mediterranean Sea ◽  
Nutrient Fluxes ◽  
Benthic Nutrient Fluxes

Low denitrification rates and variable benthic nutrient fluxes characterize Long Island Sound sediments

2021 ◽  
Author(s):  
Claudia I. Mazur ◽  
Alia N. Al-Haj ◽  
Nicholas E. Ray ◽  
Isabel Sanchez-Viruet ◽  
Robinson W. Fulweiler
Keyword(s):  
Long Island ◽  
Long Island Sound ◽  
Nutrient Fluxes ◽  
Benthic Nutrient Fluxes ◽  
Island Sound

scholarly journals Modelling nutrient fluxes into the Mediterranean Sea

2019 ◽  
Vol 22 ◽  
pp. 100592 ◽  
Author(s):  
Anna Malagó ◽  
Fayçal Bouraoui ◽  
Bruna Grizzetti ◽  
Ad De Roo
Keyword(s):  
Mediterranean Sea ◽  
Nutrient Fluxes ◽  
The Mediterranean

scholarly journals Decomposition of jellyfish carrion in situ: Short-term impacts on infauna, benthic nutrient fluxes and sediment redox conditions

2016 ◽  
Vol 566-567 ◽  
pp. 929-937 ◽  
Author(s):  
Ariella Chelsky ◽  
Kylie A. Pitt ◽  
Angus J.P. Ferguson ◽  
William W. Bennett ◽  
Peter R. Teasdale ◽  
...  
Keyword(s):  
Redox Conditions ◽  
Nutrient Fluxes ◽  
Short Term ◽  
Benthic Nutrient Fluxes

Benthic nutrient fluxes in Cadiz Bay (SW Spain)

Hydrobiologia ◽  
1993 ◽  
Vol 252 (1) ◽  
pp. 23-34 ◽  
Author(s):  
A. Gómez-Parra ◽  
J. M. Forja
Keyword(s):  
Nutrient Fluxes ◽  
Sw Spain ◽  
Cadiz Bay ◽  
Benthic Nutrient Fluxes

scholarly journals Sedimentary Organic Matter Shapes Macrofaunal Communities but Not Benthic Nutrient Fluxes in Contrasting Habitats Along the Northwest Atlantic Continental Margin

2021 ◽  
Vol 8 ◽  
Author(s):  
Marta Miatta ◽  
Paul V. R. Snelgrove
Keyword(s):  
Organic Matter ◽  
Community Composition ◽  
Continental Margin ◽  
Resource Availability ◽  
Ammonium Phosphate ◽  
Sedimentary Organic Matter ◽  
Biological Traits ◽  
Nutrient Fluxes ◽  
Northwest Atlantic ◽  
Benthic Nutrient Fluxes

The heterogeneous topography of continental margins can influence patterns of resource availability and biodiversity in deep-sea sediments, potentially altering ecosystem functioning (e.g., organic matter remineralization). Noting a lack of studies that address the latter, we contrasted spatial patterns and drivers of benthic nutrient fluxes and multiple characteristics of macrofaunal communities in shelf, slope, canyon and inter-canyon sedimentary habitats along the Northwest Atlantic continental margin. Replicate sediment push cores were collected from 10 stations (229–996 m depth), incubated for ∼48 h to estimate fluxes of nitrate, nitrite, ammonium, phosphate, and silicate (as a measure of organic matter remineralization) and subsequently analyzed to characterize macrofaunal communities. We also considered various environmental factors, including sedimentary organic matter quantity and quality, and assessed their influence on fluxes and macrofauna. Comparatively high macrofaunal density and distinct community composition and trait expression characterized Georges Canyon, where elevated sedimentary organic matter suggested important lateral transport mechanisms along this canyon axis, with deposition of organic matter strongly affecting biological communities but not benthic nutrient fluxes. Lower penetration of macrofauna into the sediments, distinct community composition, biological traits, and higher nutrient flux rates characterized inter-canyon habitats compared to slope habitats at similar depths. Within inter-canyons, intermediate to low organic matter suggested hydrodynamic forces inhibiting organic matter deposition, affecting biological and functional processes. The input of fresh phytodetritus to the seafloor was the best predictor of macrofaunal density and diversity and contributed to variation in macrofaunal community composition and biological trait expression, together with latitude, depth, and other measures of organic matter quantity and quality. Benthic nutrient fluxes revealed complex variation, with disproportionate effects of few key macrofaunal taxa, together with bottom water oxygen concentration, and sediment granulometry. Our results suggest a relationship between resource availability and macrofaunal density, diversity, and taxonomic and trait composition, whereas organic matter remineralization exhibited a more complex response, which we suggest reflected variation in hydrodynamics and/or physical disturbance in heterogeneous continental margin habitats.

Nutrient fluxes measured by two types of benthic chamber

1999 ◽  
Vol 50 (6) ◽  
pp. 567 ◽  
Author(s):  
G. J. Nicholson ◽  
A. R. Longmore ◽  
W. M. Berelson
Keyword(s):  
Dissolved Oxygen ◽  
Small Scale ◽  
Nutrient Fluxes ◽  
Data Logger ◽  
Shallow Marine ◽  
Benthic Chamber ◽  
Photosynthetic Production ◽  
Benthic Nutrient Fluxes ◽  
Marine Embayment ◽  
Oxygen Concentrations

Comparisons were made between benthic nutrient fluxes in a shallow marine embayment measured by a sophisticated automated benthic chamber device and a much simpler design. Both devices have similar chamber dimensions. The sophisticated design can be deployed by line from a vessel, incorporates an sealed waterproof computer, uses one chamber and all operations are fully programmable; dissolved oxygen concentrations are electronically monitored every 6 min and stored by the computer. The simpler design incorporates three opaque and three clear chambers per site to investigate small-scale sediment differences and the effect of benthic photosynthetic production on fluxes; dissolved oxygen concentrations are electronically monitored every 10 min. within all chambers and stored in a data logger; the deployment and recovery and sampling operations other than for DO require the use of divers. Except where sediments differ greatly over a few metres, both chamber devices deliver similar results and indicate the consistency of the technique regardless of the design. The simpler design is limited by the need for diver deployment and sampling. An automated chamber array is recommended as the best way of measuring ‘patchy’ sediments

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