The elemental composition of plankton

Martin, John H.; Knauer, George A.

doi:10.1016/0016-7037(73)90154-3

Cited by 573 publications

(245 citation statements)

References 15 publications

Supporting

Mentioning

218

Contrasting

Order By: Relevance

“…In general, the levels of minor components are similar to those reported by Martin and Knauer(1973) and Martin et al(1976) for plankton tows in the eastern north Pacific Ocean. The levels of Ni, Mn, and Cd in my samples are somewhat higher than those reported by these authors.…”

Section: Iii-1 Shipboard Experimental Summariessupporting

confidence: 89%

“…This fact, combined with other sampling and analytical problems discussed in this work, gives very little confidence in using currently reported plankton analyses in trace element geochemical models. Notable exceptions include analyses by Martin and Knauer(1973) who made serious attempts to address the problems of contamination in their samples. Martin et al(1976) have also published the only set of quality analyses which include major components (P, Si, Ca) along with the trace analyses on the bulk samples.…”

Section: Introduction Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The trace element geochemistry of marine biogenic particulate matter

Collier

Edmond

1984

Progress in Oceanography

412

217

View full text Add to dashboard Cite

Section: Iii-1 Shipboard Experimental Summariessupporting

confidence: 89%

Section: Introduction Introductionmentioning

confidence: 99%

The trace element geochemistry of marine biogenic particulate matter

Collier

Edmond

1984

Progress in Oceanography

412

217

View full text Add to dashboard Cite

“…We estimate intracellular Na using ICP-MS determined particulate phosphorus and a molar Na:P of 24.1, which was determined from phytoplankton collected in upwelling waters off the coast of California (Bruland et al 1991;Martin and Knauer 1973). Intracellular Na accounted for ~50% of total ICP-MS Na in the diatom-dominated euphotic zone of 66°S, but less than ~4%…”

Section: Sources Of Na In >51 μM Samplesmentioning

confidence: 99%

High biomass, low export regimes in the Southern Ocean

Lam

Bishop

2007

Deep Sea Research Part II: Topical Studies in Oceanography

109

View full text Add to dashboard Cite

2 AbstractThis paper investigates ballasting and remineralization controls of carbon sedimentation in the twilight zone (100-1000 m) of the Southern Ocean. Size-fractionated (<1 μm, 1-51 μm, >51 μm) suspended particulate matter was collected by large volume in-situ filtration from the upper 1000 m in the Subantarctic (55°S, 172°W) and Antarctic (66°S, 172°W) zones of the Southern Ocean during the Southern Ocean Iron Experiment (SOFeX) in January-February 2002.Particles were analyzed for major chemical constituents (POC, P, biogenic Si, CaCO 3 ), and digital and SEM image analyses of particles were used to aid in the interpretation of the chemical profiles.Twilight zone waters at 66°S in the Antarctic had a steeper decrease in POC with depth than at 55°S in the Subantarctic, with lower POC concentrations in all size fractions at 66°S than at 55°S, despite up to an order of magnitude higher POC in surface waters at 66°S. The decay length scale of >51 μm POC was significantly shorter in the upper twilight zone at 66°S ( e =26 m) compared to 55°S ( e =81 m).Particles in the carbonate-producing 55°S did not have higher excess densities than particles from the diatom-dominated 66°S, indicating that there was no direct ballast effect that accounted for deeper POC penetration at 55°S. An indirect ballast effect due to differences in particle packaging and porosities cannot be ruled out, however, as aggregate porosities were high (~97%) and variable.Image analyses point to the importance of particle loss rates from zooplankton grazing and remineralization as determining factors for the difference in twilight zone POC 3 concentrations at 55°S and 66°S, with stronger and more focused shallow remineralization at 66°S. At 66°S, an abundance of large (several mm long) fecal pellets from the surface to 150 m, and almost total removal of large aggregates by 200 m, reflected the actions of a single or few zooplankton species capable of grazing diatoms in the euphotic zone, coupled with a more diverse particle feeding zooplankton community immediately below.Surface waters with high biomass levels and high proportion of biomass in the large size fraction were associated with low particle loading at depth, with all indications implying conditions of low export. The 66°S region exhibits this "High Biomass, Low Export" (HBLE) condition, with very high >51 μm POC concentrations at the surface (~2.1 μM POC), but low concentrations below 200 m (<0.07 μM POC). The 66°S region remained HBLE after iron fertilization. Iron addition at 55°S caused a ten fold increase in >51 μm biomass concentrations in the euphotic zone, bringing surface POC concentrations to levels found at 66°S (~3.8 μM), and a concurrent decrease in POC concentrations below 200 m. The 55°S region, which began with moderate levels of biomass and stronger particle export, transitioned to being HBLE after iron fertilization. We propose that iron addition to already HBLE waters will not cause mass sedimentation events. The stability of an iron-induced HBLE condition is unknow...

show abstract

“…Toxic substances also become increasingly concentrated at higher trophic levels possibly due to biomagnifications. 2 The pesticides which are liberated into aquatic ecosystem have a tremendous effect on fish, and thereby to man. 3 With many organophosphorus insecticides, an irreversibly inhibited enzyme is formed and the signs and symptoms of intoxication are prolonged and persistent.…”

Section: Introductionmentioning

confidence: 99%

Oxidative Stress Response in Liver, Kidney and Gills of Ctenopharyngodon Idellus (Cuvier & Valenciennes) Exposed To Chlorpyrifos

Kaur

2017

MOJBM

View full text Add to dashboard Cite

Study on the chronic effects of an organophosphate, chlorpyrifos inducing oxidative stress in freshwater culturable carp, Ctenopharyngodon idellus has been made on exposure to sub-lethal concentration (1.4µg/L and 2.44µg/L) of the pesticide for 15, 30 and 60 days. Antioxidants viz. catalase (CAT), superoxide dismutase (SOD), reduced glutathione (GSH), glutathione-s-transferase (GST) and lipid peroxidation (LPO) in the liver, kidney and gills of the fish were analyzed. Studies revealed that the enhanced productions of reactive oxygen species (ROS) lead to oxidative damage to lipids & proteins, and inhibit antioxidant defence system of fish. The activity of LPO has followed an increasing trend and a decline in the activity of CAT, SOD and GSH at both the concentrations throughout the experiment. However, no definite trend in the activity of GST has been observed. Prolonged exposure to chlorpyrifos enhanced ROS formation, finally resulted in oxidative damage to cell and inhibited antioxidant capacities in the fish tissues.

show abstract

The elemental composition of plankton

Cited by 573 publications

References 15 publications

The trace element geochemistry of marine biogenic particulate matter

The trace element geochemistry of marine biogenic particulate matter

High biomass, low export regimes in the Southern Ocean

Oxidative Stress Response in Liver, Kidney and Gills of Ctenopharyngodon Idellus (Cuvier & Valenciennes) Exposed To Chlorpyrifos

Contact Info

Product

Resources

About