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Hydrobiologia

, Volume 39, Issue 3, pp 373–382 | Cite as

The interaction of light intensity and DDT concentration upon the marine diatom, Nitzschia delicatissima cleve

  • Robert B. MacFarlane
  • Walter A. Glooschenko
  • Robert C. Harriss
Article

Summary

The effects of p, p′-DDT were determined on photosynthesis and chlorophyll a content in the marine diatom Nitzschia delicatissima Cleve at four light intensities. A consistent reduction in carbon fixation and chlorophyll a per cell over controls in a 24-hour period was observed with increasing DDT concentration between 9.4 ppb and 1000 ppb. The maximum reductions of carbon uptake, chlorophyll a and carbon/chlorophyll a uptake per cell occurred at the highest light intensities. Carbon fixation per cell was reduced by as much as 94% in water containing an initial DDT concentration of 100 ppb, and chlorophyll a per cell by as much as 86% in 220 ppb DDT. Above 100 ppb, further decreases of carbon fixation and chlorophyll a per cell were not observed. Distortion of the chloroplasts in the cells exposed to DDT was also observed at the lowest concentration of DDT used. At 1000 ppb, chloroplasts were totally destroyed within 24 hours.

Keywords

Chlorophyll Light Intensity Photosynthesis Carbon Fixation High Light Intensity 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Zusammenfassung

Die Wirkung von p, p′-DDT auf Photosynthese und Chlorophyll a Gehalt der Meeresdiatomee Nitschia delicatissima Cleve wurde untersucht unter vier Lichtintensitäten. Bei DDT Konzentrationen, steigend von 9,4 ppb bis 1000 ppb, wurde eine fortschreitende Reduktion der Kohlenstoff bindung und des Chlorophyll a Gehaltes pro Zelle gefunden, wobei die höchtse Lichtintensität die stärkste Reduktion, sowie auch die niedrigste Kohlenstoff/Chlorophyll a Aufnahme pro Zelle zeigte. In Wasser mit anfänglichem DDT Gehalt von 100 ppb, wurde die Kohlenstoff bindung pro Zelle 94% reduziert und beim DDT Gehalt von 220 ppb, wurde der Chlorophyll a Gehalt mit 86% reduziert. Bei Konzentrationen über 100 ppb, fielen Kohlenstoff bindung und Chlorophyll a Gehalt pro Zelle nicht weiter ab.

Schädigungen der Chloroplasten in der Zelle wurden schon bei den niedrigsten DDT Gehalten festgestelt. Bei 100 ppb wurden die Chloroplasten innerhalb 24 Stunden völlig zerstört.

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Copyright information

© Dr. W. Junk b. v. Publishers 1972

Authors and Affiliations

  • Robert B. MacFarlane
    • 1
  • Walter A. Glooschenko
    • 1
  • Robert C. Harriss
    • 1
  1. 1.Department of OceanographyFlorida State UniversityTallahasseeU.S.A.

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