Relative rates of photosynthesis and standing stock of the net phytoplankton and nannoplankton

Some experiments on C-14 uptake and cell numbers were made with the purpose of comparing nannoplankton and net phytoplankton from surface sea-water samples collected at six stations in Equatorial waters (Fig. 1). The results of these experiments showed a pronounced difference between nanno and net phytoplankton in photosynthesis and in cell numbers (Table I). The net phytoplankton represents an average of as little as 9.93% of total photosynthesis and 22.20% in numbers of organisms of total phytoplankton. The results obtained in coastal and in oceanic waters show that the effect of the proximity of land on standing stock and upon primary production is well marked (Table II). The results obtained are discussed and compared with data of earlier papers.

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Seasonal studies on the phytoplankton and primary production in the inner Firth of Clyde

Proceedings of the Royal Society of Edinburgh Section B Biological Sciences ◽

10.1017/s0269727000004991 ◽

1986 ◽

Vol 90 ◽

pp. 203-222

Author(s):

A. D. Boney

Keyword(s):

Primary Production ◽

Seasonal Changes ◽

Total Carbon ◽

Zooplankton Grazing ◽

Cell Numbers ◽

Annual Basis ◽

Factors Influencing ◽

Dispersion Data ◽

Net Phytoplankton

SynopsisAnalysis of the factors influencing the seasonal changes in biomass of the ‘net’ phytoplankton in 1972– 73 snowed that the dynamics of the spring waxing of the diatom populations were controlled by narrow ‘windows’ of climatic events, and that subsequent fluctuations in cell numbers were linked with the interplay between zooplankton grazing and wind induced dispersion. Data for 1976–77, set against a similar background of events with the ‘net’ plankton, showed that the nanophytoplankton constituted a less variable biomass through the seasons and, on an annual basis, contributed some 50% of the total carbon fixed.

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The Effect of Storage Temperature on the Enumeration of Epifluorescence-Detectable Bacterial Cells in Preserved Sea-Water Samples

Journal of the Marine Biological Association of the United Kingdom ◽

10.1017/s0025315400035827 ◽

1994 ◽

Vol 74 (1) ◽

pp. 259-262 ◽

Cited By ~ 17

Author(s):

C. M. Turley ◽

D. J. Hughes

Keyword(s):

Water Samples ◽

Room Temperature ◽

Storage Temperature ◽

Sea Water ◽

Storage Period ◽

Cell Loss ◽

Bacterial Cells ◽

Cell Numbers ◽

Significant Difference ◽

Original Cell

Rates of decrease in epifluorescence-detectable bacteria in preserved sea-water samples changed significantly with temperature. This apparent cell loss was substantial even in preserved samples stored in a refrigerator, decreasing exponentially with time, with 56% apparent cell loss after 99 days’ storage. Storage at room temperature resulted in the greatest decrease in detectable cells, with 73% apparent cell loss after the same storage period. No significant difference was found between storage in two different containers. The apparent cell loss can be modelled in order to calculate the original cell numbers with confidence. However, models produced from one set of samples cannot be applied to the data from another.

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SITE-SPECIFIC EQUATIONS OF STATE FOR COASTAL SEA AREAS AND INLAND WATER BODIES

Proceedings of International Conference "Managinag risks to coastal regions and communities in a changinag world" (EMECS'11 - SeaCoasts XXVI) ◽

10.31519/conferencearticle_5b1b9452bebe47.34318019 ◽

2017 ◽

Author(s):

Natalia Andrulionis ◽

Ivan Zavialov ◽

Elena Kovaleva ◽

...

Keyword(s):

Equation Of State ◽

Black Sea ◽

Water Samples ◽

Equations Of State ◽

Sea Water ◽

Ionic Composition ◽

Water Bodies ◽

Aral Sea ◽

The Black Sea ◽

Coastal Sea

This article presents a new method of laboratory density determination and construction equations of state for marine waters with various ionic compositions and salinities was developed. The validation of the method was performed using the Ocean Standard Seawater and the UNESCO thermodynamic equation of state (EOS-80). Density measurements of water samples from the Aral Sea, the Black Sea and the Issyk-Kul Lake were performed using a high-precision laboratory density meter. The obtained results were compared with the density values calculated for the considered water samples by the EOS-80 equation. It was shown that difference in ionic composition between Standard Seawater and the considered water bodies results in significant inaccuracies in determination of water density using the EOS-80 equation. Basing on the laboratory measurements of density under various salinity and temperature values we constructed a new equation of state for the Aral Sea and the Black Sea water samples and estimated errors for their coefficients.

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Nutrient and temperature constraints on primary production and net phytoplankton growth in a tropical ecosystem

Limnology and Oceanography ◽

10.1002/lno.11849 ◽

2021 ◽

Author(s):

Daffne C. López‐Sandoval ◽

Carlos M. Duarte ◽

Susana Agustí

Keyword(s):

Primary Production ◽

Phytoplankton Growth ◽

Tropical Ecosystem ◽

Net Phytoplankton

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Carbon-14 in the Southern Indian Ocean

Radiocarbon ◽

10.1017/s0033822200010055 ◽

1980 ◽

Vol 22 (3) ◽

pp. 684-692 ◽

Cited By ~ 6

Author(s):

Georgette Delibrias

Keyword(s):

Surface Water ◽

Indian Ocean ◽

Water Samples ◽

Sea Water ◽

Time Lag ◽

Vertical Profiles ◽

Carbon 14 ◽

Middle Latitudes ◽

The North ◽

The Indian Ocean

14C measurements were carried out on sea water samples collected in 1973, in the Indian ocean. The results obtained for 9 vertical profiles between 27° S and 48°S are presented. In surface water, the bomb 14C content is maximum at middle latitudes. A time lag relative to the north hemisphere bomb 14C delivery is apparent. In the more southern latitudes, 14C content remains very low.

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Sewage contamination of coastal bathing waters in england and wales A bacteriological and epidemiological study

Epidemiology and Infection ◽

10.1017/s0022172400020301 ◽

1959 ◽

Vol 57 (4) ◽

pp. 435-472 ◽

Cited By ~ 72

Author(s):

Keyword(s):

Water Samples ◽

Sea Water ◽

Test Procedure ◽

Great Majority ◽

Controlled Study ◽

England And Wales ◽

Representative Sampling ◽

Small Series ◽

Bathing Waters ◽

Ranking Order

1. Bacteriological surveys of more than forty popular bathing beaches around the coasts of England and Wales have been made during the past 5 years. The great majority of the beaches studied were subject to contamination with sewage.2. A rough grading of the beaches studied gave a similar ranking order whether the results of the presumptive coliform test or faecal coli counts were used as the basis of grading.3. Grading of beaches was valid only when surveys were carefully planned to ensure representative sampling from the areas on the beaches concerned where bathing actually took place.4. The coliform test as used in the bacteriological examination of drinking waters was the main test procedure used but had certain limitations. Promising results with plate counts on relatively non-inhibitory media were obtained.5. Various salmonella serotypes, notablySalm. paratyphi B, were isolated in small numbers from a high proportion of sea-water samples. The proportion of positive results for salmonella isolation increased from 13·3% in samples with less than 1000 coliform organisms per 100 ml. to 40·1% in samples with over 10,000 coliforms per 100 ml. Comparison of the numbers of salmonellae isolated with what is known of the minimum infective doses of these organisms suggested that very large volumes of sea water would require to be ingested for infection to occur.6. Poliovirus was not isolated from a small series of sea-water samples examined. Because of the very large dilution factor, special concentration procedures would probably be required to isolate this virus from sea water.7. Four cases of paratyphoid fever probably due to bathing were recorded. Surveys of the two associated beaches had given median presumptive coliform counts of more than 10,000 per 100 ml., and both showed gross macroscopic pollution with sewage.8. A statistically controlled study of the bathing histories of 150 poliomyelitis cases in children living permanently by the seaside gave no evidence that bathing had played any part in causing the disease.

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