Marine Biology

, Volume 90, Issue 1, pp 117–119 | Cite as

Reductions in photosynthetic carbon uptake in epiphytic diatoms by water-soluble extracts of leaves of Zostera marina

  • Paul G. Harrison
  • C. D. Durance


A water-soluble fraction of green leaves of Zostera marina L. decreased carbon uptake rates in diatoms found as epiphytes at Roberts Bank (Lat 49°2′N; Long. 123°8′W) on the west coast of Canada. Extract concentrations of 11 to 1 μg dry leaf ml-1, added immediately before 14C-uptake was measured over a 3-h period, reduced uptake to 36 to 80% of controls, respectively. A lower concentration (0.6 μg dry leaf ml-1) reduced uptake significantly in only one of four cultures. Addition of the whole extract 3 d before carbon uptake was measured or in one-third doses, 0, 1, and 2 d before, resulted in inhibition similar to that observed when the whole extract was added immediately before the 14C.


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Literature cited

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Copyright information

© Springer-Verlag 1985

Authors and Affiliations

  • Paul G. Harrison
    • 1
  • C. D. Durance
    • 1
  1. 1.Department of BotanyUniversity of British ColumbiaVancouverCanada

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