Journal of Plankton Research, Vol 21, 343-354, Copyright © 1999 by Oxford University Press
J Lewis, A Harris, K Jones and R Edmonds
Sediment samples from Scottish coastal sites, taken over the last 9 years,
were stored in closed containers at 5
ORIGINAL ARTICLES
Long-term survival of marine planktonic diatoms and dinoflagellates in stored sediment samples
Applied Ecology Research Group, University of Westminster, 115 New Cavendish Street, London W1M 8JS, UK; Dunstaffnage Marine Laboratory, PO Box 3, Oban, Argyll PA34 4AD, UK
C.
Slurry cultures were used to determine the survival of phytoplankton in
these sediments. A range of diatom and dinoflagellate species survived for
at least 27 months in these stored samples. A number of species grew for
which no resting stage has yet been described: Thalassiosira
angulata, T.pacifica, T.punctigera, T.eccentrica, T.minima and
T.anguste-lineata. Notable results were survival times
of 73 months for Skeletonema costatum, 96 months for
Chaetoceros socialis, C.didymus and
C.diadema, 109 months for
Scrippsiella sp. and 112 months for
Lingulodinium polyedrum. A single sample was stored
and repeatedly cultured for diatoms over a period of 16 months. The number
of species cultured from the sediment declined over this time.
Lingulodinium polyedrum cysts isolated from sediments
collected at least 18 months previously gave a hatching success of 97%, and
cysts isolated from a 9-year-old sample gave a hatching success of 3%. The
study indicated the potential importance of coastal sediments as a source
of phytoplankton to their overlying waters. The validity of using marine
planktonic diatoms and dinoflagellates for modelling geological events is
discussed.
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