Nutrient fluxes between water column and sediments: Potential influence of the pearl oyster culture

2012 ◽  
Vol 65 (10-12) ◽  
pp. 500-505 ◽  
Author(s):  
Nabila Gaertner-Mazouni ◽  
Elise Lacoste ◽  
Alain Bodoy ◽  
Lisa Peacock ◽  
Martine Rodier ◽  
...  
Keyword(s):  
Water Column ◽  
Pearl Oyster ◽  
Nutrient Fluxes ◽  
Potential Influence ◽  
Oyster Culture

scholarly journals The mass impacts on chemosynthetic primary producers: potential implications on anammox communities and their consequences

2018 ◽  
Vol 18 (05) ◽  
pp. 440-444
Author(s):  
Noel Pérez ◽  
Jorge Luis Velazco-Vargas ◽  
Osmel Martin ◽  
Rolando Cardenas ◽  
Jesús Martínez-Frías
Keyword(s):  
Water Column ◽  
Deposition Rate ◽  
Extreme Case ◽  
Chemical Compounds ◽  
Global Scale ◽  
Biogeochemical Cycle ◽  
Potential Influence ◽  
Asteroid Impact ◽  
Global Cooling ◽  
The Impact

AbstractThe potential of a mass asteroid impact on Earth to disturb the chemosynthetic communities at global scale is discussed. Special emphasis is made on the potential influence on anammox communities and their implications in the nitrogen biogeochemical cycle. According to our preliminary estimates, anammox communities could be seriously affected as a consequence of global cooling and the large process of acidification usually associated with the occurrence of this kind of event. The scale of affectations could vary in a scenario like the Chicxulub as a function of the amount of soot, depth of the water column and the deposition rate for sulphates assumed in each case. The most severe affectations take place where the amount of soot and sulphates produced during the event is higher and the scale of time of settlements for sulphates is short, of the order of 10 h. In this extreme case, the activity of anammox is considerably reduced, a condition that may persist for several years after the impact. Furthermore, the impact of high levels of other chemical compounds like sulphates and nitrates associated with the occurrence of this kind of event are also discussed.

scholarly journals Marinomonas ostreistagni sp. nov., isolated from a pearl-oyster culture pond in Sanya, Hainan Province, China

2006 ◽  
Vol 56 (10) ◽  
pp. 2271-2275 ◽  
Author(s):  
Ken W. K. Lau ◽  
Jianping Ren ◽  
Natalie L. M. Wai ◽  
Simon C. L. Lau ◽  
Pei-Yuan Qian ◽  
...  
Keyword(s):  
Marine Bacterium ◽  
Gene Sequence ◽  
Novel Species ◽  
Sequence Similarity ◽  
Pearl Oyster ◽  
Rrna Gene ◽  
Hainan Province ◽  
Oyster Culture ◽  
Gene Sequence Analysis ◽  
Type Strains

A Gram-negative, aerobic, halophilic, neutrophilic, rod-shaped, non-pigmented, polar-flagellated bacterium, UST010306-043T, was isolated from a pearl-oyster culture pond in Sanya, Hainan Province, China in January 2001. This marine bacterium had an optimum temperature for growth of between 33 and 37 °C. On the basis of 16S rRNA gene sequence analysis, the strain was closely related to Marinomonas aquimarina and Marinomonas communis, with 97.5–97.7 and 97.1 % sequence similarity, respectively. Levels of DNA–DNA relatedness to the type strains of these species were well below 70 %. Analyses of phylogenetic, phenotypic and chemotaxomonic characteristics showed that strain UST010306-043T was distinct from currently established Marinomonas species. A novel species with the name Marinomonas ostreistagni sp. nov. is proposed to accommodate this bacterium, with strain UST010306-043T (=JCM 13672T=NRRL B-41433T) as the type strain.

scholarly journals Equatorward Pathways of Solomon Sea Water Masses and Their Modifications

2011 ◽  
Vol 41 (4) ◽  
pp. 810-826 ◽  
Author(s):  
Angélique Melet ◽  
Jacques Verron ◽  
Lionel Gourdeau ◽  
Ariane Koch-Larrouy
Keyword(s):  
Water Column ◽  
Water Mass ◽  
Sea Water ◽  
Southern Oscillation ◽  
Equatorial Pacific ◽  
Water Masses ◽  
Internal Tides ◽  
Tidal Mixing ◽  
Western Boundary ◽  
Potential Influence

Abstract The Solomon Sea is a key region of the southwest Pacific Ocean, connecting the thermocline subtropics to the equator via western boundary currents (WBCs). Modifications to water masses are thought to occur in this region because of the significant mixing induced by internal tides, eddies, and the WBCs. Despite their potential influence on the equatorial Pacific thermocline temperature and salinity and their related impact on the low-frequency modulation of El Niño–Southern Oscillation, modifications to water masses in the Solomon Sea have never been analyzed to our knowledge. A high-resolution model incorporating a tidal mixing parameterization was implemented to depict and analyze water mass modifications and the Solomon Sea pathways to the equator in a Lagrangian quantitative framework. The main routes from the Solomon Sea to the equatorial Pacific occur through the Vitiaz and Solomon straits, in the thermocline and intermediate layers, and mainly originate from the Solomon Sea south inflow and from the Solomon Strait itself. Water mass modifications in the model are characterized by a reduction of the vertical temperature and salinity gradients over the water column: the high salinity of upper thermocline water [Subtropical Mode Water (STMW)] is eroded and exported toward surface and deeper layers, whereas a downward heat transfer occurs over the water column. Consequently, the thermocline water temperature is cooled by 0.15°–0.3°C from the Solomon Sea inflows to the equatorward outflows. This temperature modification could weaken the STMW anomalies advected by the subtropical cell and thereby diminish the potential influence of these anomalies on the tropical climate. The Solomon Sea water mass modifications can be partially explained (≈60%) by strong diapycnal mixing in the Solomon Sea. As for STMW, about a third of this mixing is due to tidal mixing.

scholarly journals Redescription of Larval Development in Cultured Pearl Oyster Pinctada maxima

2018 ◽  
Vol 23 (2) ◽  
pp. 109
Author(s):  
Jeane Siswitasari Mulyana ◽  
Achmad Farajallah ◽  
Yusli Wardiatno
Keyword(s):  
Developmental Stage ◽  
Larval Development ◽  
Shell Length ◽  
Shell Height ◽  
Pearl Oyster ◽  
Oyster Culture ◽  
Veliger Larva ◽  
Pinctada Maxima

Larval development plays a major role in efficient pearl culture. The cultured larvae will be later used for recipient and donor oysters in cultured pearl production. Larval developmental stage of silver lip pearl oyster Pinctada maxima has been reported by several studies. Those studies used female and male oyster parents directly taken from natural habitat.This study aimed to redescribe larval development of P. maxima from commercial pearl oyster culture farm in Indonesia. Larval development of this species whose parents are originated from selected groups in the pearl culture farm has not been reported yet, thus it is necessary to be described. This species undergoes specific larval developmental stage. The larvae were observed under microscope, and then the average shell length (SL) and shell height (SH) were measured. D-shaped veliger larva (77.4±0.3 µm SL; 65.4±1.1 µm SH) appeared 20 h after fertilization. Tenday-old larva (156.2±2.8 µm SL; 149.5±5.6 µm SH) had developed umbo region so it was called umbonal larva. Umbonal larva then developed further into plantigrade larva (411.3±9.8 µm SL; 380.5±6.9 µm SH) in 25 days after fertilization. Developmental stage and larval sizein P. maxima is similar with those observed in P. fucata and P. margaritifera. Keywords: growth, larva, plantigrade, shell, umbo, veliger

The potential of benthic iron and phosphorus fluxes to support the growth of a bloom forming toxic cyanobacterium Lyngbya majuscula, Moreton Bay, Australia

2016 ◽  
Vol 67 (12) ◽  
pp. 1918 ◽  
Author(s):  
Peter Hanington ◽  
Andrew Rose ◽  
Ron Johnstone
Keyword(s):  
Water Column ◽  
Benthic Community ◽  
Sediment Cores ◽  
Community Change ◽  
Flood Event ◽  
Nutrient Fluxes ◽  
Marine Cyanobacterium ◽  
Lyngbya Majuscula ◽  
Moreton Bay ◽  
Sandy Sediments

Lyngbya majuscula is a bloom-forming toxic marine cyanobacterium. Most research on L. majuscula growth in Moreton Bay has focussed on water column supplies of iron and phosphorus with little consideration of benthic sources and supply. This study investigates the potential for sandy sediments in a shallow, well mixed subtropical embayment (Deception Bay, Moreton Bay, Australia) to supply iron and phosphorus for L. majuscula growth after significant benthic community change following a major flood event. Measurements of benthic oxygen, iron and nutrient fluxes were obtained by incubating intact sediment cores sampled from Deception Bay. Results suggest that post-flood sediment communities are capable of supplying >1300% of daily L. majuscula Fe requirements and up to 9.2% of daily P demands, suggesting that L. majuscula growth in Deception Bay is likely to be P limited. The benthic release of PO43– and FeII only occurred after water column DO became depleted below 3mgL–1. This study suggests that the benthic release of PO43– and FeII could support the initiation and growth of L. majuscula blooms in Deception Bay.

scholarly journals The Influence of Turbulent Mixing on the Subsurface Chlorophyll Maximum Layer in the Northern South China Sea

2020 ◽  
Author(s):  
Chenjing Shang ◽  
Changrong Liang ◽  
Guiying Chen ◽  
Yongli Gao
Keyword(s):  
South China Sea ◽  
Water Column ◽  
South China ◽  
Turbulent Mixing ◽  
Northern South China Sea ◽  
Luzon Strait ◽  
Nutrient Fluxes ◽  
Chl A ◽  
China Sea ◽  
Subsurface Chlorophyll Maximum

Abstract. We present observations from deployments of a turbulent microstructure instrument and a CTD package in the northern South China Sea from April to May 2010. From these we determined the turbulent mixing (dissipation rate ε and diapycnal diffusivity κ), nutrients (phosphate, nitrate, and nitrite), nutrient fluxes, and chlorophyll a (Chl-a) in two transects (A and B). Transect A was located in region far away from the Luzon Strait where turbulent mixing in the upper 100 m was weak (κ~10−6–10−4 m2 s−1). Transect B was located in region near the Luzon Strait where the turbulent mixing in the upper 100 m was strong (κ~10−5–10−3 m2 s−1) due to the influence of the internal waves originating from the Luzon strait and the water intrusion from the western Pacific. In both transects, there was a thin subsurface chlorophyll maximum layer (SCML) (0.3–0.7 mg m−3) nested in the water column between ~50 and 100 m. The observations indicate that effects of turbulent mixing on the distributions of nutrient and Chl-a were different in different transects. In transect with weak turbulent mixing, nutrient fluxes induced by turbulent mixing transported nutrients to the SCML but not to the upper water. Nutrients were sufficient to maintain a local SCML phytoplankton population and the SCML remained compact. In transect with strong turbulent mixing, nutrient fluxes induced by turbulent mixing transported nutrients not only to the SCML but also to the upper water, which scatters the nutrients in the water column, and weakens and diffuses the SCML.

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