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- Title
Phytoplankton abundance and pigment changes during simulated in situ dilution experiments in estuarine waters: possible artifacts caused by algal light adaptation.
- Authors
McManus, George B.
- Abstract
I performed a dilution experiment during summer in mesohaline Chesapeake Bay, comparing net growth rates of phytoplankton based on increases in accessory pigments with those based on cell counts of corresponding algal taxa. Fucoxanthin and peridinin increases were poor predictors of cell growth rates for diatoms and dinofiagellates, respectively, especially in the high dilutions (90% filtered seawater), while zeaxanthin predicted growth rates of coccoid cyanobacteria closely. The insensitivity of microscope estimates for rare, large phytoplankters may have contributed to the disparity between pigment and cell growth rates, but this effect is argued to be small because all species present at >1 cell ml were enumerated. Further experiments with phytoplankton cultures suggest that light adaptation can lead to underestimates of growth when pigments are used as a surrogate for cell abundance in turbulent, eutrophic waters where the light field experienced by phytoplankton in Situ 5 difficult to simulate.
- Publication
Journal of Plankton Research, 1995, Vol 17, Issue 8, p1705
- ISSN
0142-7873
- Publication type
Article