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INTERACTIONS BETWEEN MICROSCOPIC PROPAGULES OF ULVA PROLIFERA AND ALEXANDRIUM
Author(s): 
Pages: 1312-1320
Year: Issue:  6
Journal: Oceanologia et Limnologia Sinica

Keyword:  green tideUlva proliferamicroscopic propagulesinteraction;
Abstract: Large-scale outbreaks of green tides of Ulva prolifera threatened estuarine and coastal ecosystems in the Yellow Sea recent years. We studied interactions between common red-tide-causative microalgae Alexandrium and the microscopic propagules(unisexual gametes) of U. prolifera at settlement and germination stages in co-culture systems. The results show that U. prolifera gametes at settlement stage had no effects on growth of Alexandrium species; but the microscopic forms of subsequent germinated U. prolifera inhibited significantly the growth of Alexandrium tamarense, and the inhibition rate was 27% on Day 7. Inversely, all four Alexandrium strains inhibited settlement of U. prolifera gametes at an ID50 less than 50 cells/m L in 24 h, but had no adverse influence on germination of U. prolifera propagules. Therefore, the competitive advantage of microalgae took effect mainly at the settlement stage due to possible allelechemicals of non-PSP allelopathic substances released from Alexandrium. These substances might be composed of both protein and non-protein components, while the allelochemicals secreted from U. prolifera gametes might take competitive advantage at the germination stage.
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