Hostname: page-component-cd9895bd7-gvvz8 Total loading time: 0 Render date: 2024-12-26T01:33:15.507Z Has data issue: false hasContentIssue false
  • English
  • Français

Seasonal Variations in the Phosphate and Silicate Content of Sea-Water in Relation to the Phyto-plankton Crop. Part V. November 1927 to April 1929, Compared with Earlier Years from 1923

Published online by Cambridge University Press:  16 October 2009

W. R. G. Atkins
W. R. G. Atkins
Affiliation:
Head of the Department of General Physiology at the Plymouth Laboratory.
Get access Rights & Permissions [Opens in a new window]

Extract

In the previous numbers of this series (1923, 1925, 1926, 1928) it was fully established that the phosphate and silicate content of sea-water becomes greatly reduced in spring and summer. It is possible to calculate a minimum value for the phytoplankton crop from the amount of phosphate used up, also to ascertain the production up to and between various dates; such information has a direct bearing on the supply of food for copepods and other animals upon which young fish feed. The accumulation of data of this type should in time permit of some generalization as to the favourableness or otherwise of any season with respect to the survival of relatively large numbers of young fish of various species in the locality studied. The present paper is a further contribution towards the amassing of seasonal productivity data which has been in progress since March 1923, with a gap from March to October, inclusive, during 1927. Information has moreover been sought as to the extent to which the removal of the phosphate approaches completion; the analyses of water samples low in phosphate have been carried out with a rather greater degree of accuracy than heretofore, by using a more exact method of allowing for the reagent blank, by using weaker standard solutions and by ensuring that in nearly every case the analyses were performed on the day following that on which the water samples had been taken. When the cruise extended for two days this was not possible as regards samples taken on the first day. Furthermore, measurements have been made (Poole and Atkins, 1928) of the illumination, both aerial and submarine, obtaining when the samples were taken.

Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 16 , Issue 3 , May 1930 , pp. 821 - 852
Copyright
Copyright © Marine Biological Association of the United Kingdom 1930

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

Atkins, W. R. G. 1924. The hydrogen ion concentration of sea-water in relation to photosynthetic changes. Pt. III. J. Marine Biol. Assoc., 13, 437–446.CrossRefGoogle Scholar
Atkins, W. R. G. 1923. The phosphate content of fresh and salt waters in its relationship to the growth of the algal plankton. Loc. cit., 13, 119–150.Google Scholar
Atkins, W. R. G. 1925. Seasonal changes in the phosphate content of sea-water in relation to the growth of the algal plankton during 1923 and 1924. Loc. cit., 13, 700–720.Google Scholar
Atkins, W. R. G. 1926. The phosphate content of sea-water in relation to the growth of the algal plankton. Pt. III. Loc. cit., 14, 447–467.Google Scholar
Atkins, W. R. G. 1928. Seasonal variations in the phosphate and silicate content of sea-water during 1926 and 1927 in relation to the phytoplankton crop. Loc. cit., 15, 191–205.Google Scholar
Atkins, W. R. G. 1923. The silica content of some natural waters and of culture media. Loc. cit., 13, 151–159.Google Scholar
Atkins, W. R. G. 1926. Seasonal changes in the silica content of natural waters in relation to the phytoplankton. Loc. cit., 14, 89–99.Google Scholar
Atkins, W. R. G., and Wilson, E. G. 1926. The color metric estimation of minute amounts of compounds of silicon, of phosphorus and of arsenic. Biochem. J., 20, 1223–1228, No. 6.CrossRefGoogle Scholar
Atkins, W. R. G., and POOLE, H. H. 1930. The photo-electric recording of daylight. Nature, 125.Google Scholar
Benedict, S. R. 1922. A method for the purification of picric acid for creatinine determinations. J. Biol. Chem., 54, 239–241.CrossRefGoogle Scholar
Benedict, S. R. 1929. A note on the purification of picric acid for creatinine determinations. Loc. cit., 82, 1–3.Google Scholar
Dienert, F., and Wandenbulcke, F. 1923. Sur le dosage de la silice dans les eaux. C.R. Acad. des Sc., Paris, 176, 1478–1480.Google Scholar
Folin, O., and Doisy, E. A. 1916. Impure picric acid as a source of error in creatine and creatinine determinations. J. Biol. Chem., 28, 349–356.CrossRefGoogle Scholar
Herdman, W. A., Scott, A., and Dakin, W. J. 1910. Intensive study of the marine plankton around the south end of the Isle of Man. Pt. III. Trans. Liverpool Biol. Soc.Google Scholar
King, E. J., and Lucas, C. C. 1928. The use of picric acid as an artificial standard in the colorimetric estimation of silica. J. Amer. Chem. Soc., 50, 2395–2397.CrossRefGoogle Scholar
Marshall, S. M., and Orr, A. P. 1927. The relation of the plankton to some chemical and physical factors in the Clyde Sea area. J. Marine Biol, Assoc, 14, 837–868.CrossRefGoogle Scholar
Marshall, S. M., and Orr, A. P. 1928. The photosynthesis of diatom cultures in the sea. J. Marine Biol. Assoc, 15, 321–360.CrossRefGoogle Scholar
Mcclendon, J. F. 1917. The standardization of a new colorimetric method for the determination of the hydrogen ion concentration, C02 tension, and C02 and 02 content of sea-water, of animal heat, and of CO a of the air, with a summary of similar data on bicarbonate solutions in general. J. Biol. Chem., 30, 265–288.CrossRefGoogle Scholar
Poole, H. H., and Atkins, W. R. G. 1928. Photo-electric measurements of submarine illumination throughout the’ year. J. Marine Biol. Assoc, 16, 297–324.CrossRefGoogle Scholar
Thresh, J. C., and Be Ale, J. F. 1925. The examination of waters and water supplies. London.Google Scholar