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Laboratory models of diel vertical migration in the dinoflagellate Ceratium hirundinella
Author(s) -
HEANEY S. I.,
FURNASS T. I.
Publication year - 1980
Publication title -
freshwater biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.297
H-Index - 156
eISSN - 1365-2427
pISSN - 0046-5070
DOI - 10.1111/j.1365-2427.1980.tb01190.x
Subject(s) - diel vertical migration , dinoflagellate , irradiance , population , bloom , stratification (seeds) , oceanography , biology , maxima , settling , atmospheric sciences , ecology , environmental science , geology , botany , physics , optics , seed dormancy , demography , germination , dormancy , sociology , environmental engineering , art , performance art , art history
SUMMARY. Diel vertical migrations of a dinoflagellate, Ceratium hirundinella , were induced in a laboratory tube (1.63 × 0.15 m) under a light‐dark cycle. The timing of vertical migrations differed between cultures in the exponential and stationary phases of growth; the latter showed a greater coincidence with the light regime. Migration of cells into the surface layers occurred at low values of surface irradiance (<550 μeinsteins m −2 s −1 ). At irradiances more closely approaching summer sunshine (> 1300 μE m −2 s −1 ) there was a marked avoidance of surface waters, and population maxima were found at depths associated with a relative irradiance level of 10% or c. 150 μE m −2 s −1 ). Thermal stratification restricted downward movement of cells into the cooler layers. The combination of high surface irradiance and thermal stratification resulted in large, stable, sub‐surface maxima of Ceratium , similar to those observed in natural waters under comparable environmental conditions.