Picoplankton dynamics in Davies Reef lagoon, the Great Barrier Reef, Australia |
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Authors: | Ayukai Tenshi |
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Institution: | Australian Institute of Marine Science PMB No. 3, Townsville MC, Queensland 4810, Australia |
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Abstract: | The diel variations in abundance and frequency of dividing cells(FDC) of coccoid cyanobacteria in a coral reef lagoon were investigatedin June, September and December 1989, and April 1990. Cyanobacteriaand picoplanktonic eukaryotes (<3 µm) were sampledmonthly from January to December 1990. The average abundancesof cyanobacteria and eukaryotes ranged between 1.1710.06104cells ml1 and 0.162.41104 cells ml1, respectively,with abundances of both being higher in summer (November-April)than in winter (May-October). The ratio of cyanobacteria toeukaryotes fluctuated from 1.93 to 8.67, independent of theseasonal variation in their abundances. The instantaneous growthrate of cyanobacteria, which was estimated from the daytimeabundance increment, ranged between 0.430 and 3.144 day1The estimated daily specific growth rate of cyanobacteria bythe FDC method ranged between 0.231 and 0.966 day1. InApril, despite the high specific growth rate and low flushingconditions. cyanobacterial abundance showed a cyclic diel pattern,suggesting a strong grazing impact on their population. |
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