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Impact of natural and artificial UVB radiation on motility and growth rate of marine dinoflagellates

Nielsen, Tom LU ; Björn, Lars Olof LU and Ekelund, Nils G. A. (1995) In Journal of Photochemistry and Photobiology, B: Biology 27(1). p.73-79
Abstract
The growth rates and motility of dinoflagellates were studied in the field in the presence or absence of UVB radiation, as well as in the laboratory under artificial radiation conditions. Photosynthetically active radiation (PAR, 400–700 nm) and UVB radiation showed large variations due to cloud cover and seasonal changes in natural daylight. In Swedish coastal water, UVB radiation was attenuated to about 10% of surface irradiance at a depth of 120 cm. There was no significant difference in the motility of two strains of Prorocentrum minimum (Atlantic, LAC4LI; Kattegat, LAC6KA83) kept in the water at different depths (35 and 120 cm) for 4 h, with or without natural solar UV radiation, except for a day with high UVB irradiance (1.2 W m−2),... (More)
The growth rates and motility of dinoflagellates were studied in the field in the presence or absence of UVB radiation, as well as in the laboratory under artificial radiation conditions. Photosynthetically active radiation (PAR, 400–700 nm) and UVB radiation showed large variations due to cloud cover and seasonal changes in natural daylight. In Swedish coastal water, UVB radiation was attenuated to about 10% of surface irradiance at a depth of 120 cm. There was no significant difference in the motility of two strains of Prorocentrum minimum (Atlantic, LAC4LI; Kattegat, LAC6KA83) kept in the water at different depths (35 and 120 cm) for 4 h, with or without natural solar UV radiation, except for a day with high UVB irradiance (1.2 W m−2), which decreased the motility at a depth of 35 cm for the two species). Simulated in situ experiments with 2 h natural daylight, with and without natural UV radiation (UVB, 1.6 W m−2), had a dramatic effect on the motility of Gyrodinium aureolum. Artificial UVB radiation from UV lamps (4 h, 2.72 kJ m−2 day−1, biologically effective UVB radiation, UVBBE) in the laboratory decreased the motility of Heterocapsa triquetra (LAC20) by 56% and the two strains of P. minimum (Atlantic, LAC4LI; Kattegat, LAC6KA83) by 43% and 36% respectively; the growth was inhibited for all species, as well as for Amphidinium carterae (LAC1KA83), when organisms were exposed to more than 0.7 kJ m−2 day−1 of UVBBE radiation. (Less)
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author
organization
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type
Contribution to journal
publication status
published
subject
in
Journal of Photochemistry and Photobiology, B: Biology
volume
27
issue
1
pages
73 - 79
publisher
Elsevier
external identifiers
  • scopus:0028883337
ISSN
1011-1344
DOI
10.1016/1011-1344(94)07059-W
language
English
LU publication?
yes
id
3b2ee444-c8e3-4fd7-bcad-2e7cd263f88c (old id 134526)
date added to LUP
2007-07-30 10:32:32
date last changed
2017-01-01 06:42:37
@article{3b2ee444-c8e3-4fd7-bcad-2e7cd263f88c,
  abstract     = {The growth rates and motility of dinoflagellates were studied in the field in the presence or absence of UVB radiation, as well as in the laboratory under artificial radiation conditions. Photosynthetically active radiation (PAR, 400–700 nm) and UVB radiation showed large variations due to cloud cover and seasonal changes in natural daylight. In Swedish coastal water, UVB radiation was attenuated to about 10% of surface irradiance at a depth of 120 cm. There was no significant difference in the motility of two strains of Prorocentrum minimum (Atlantic, LAC4LI; Kattegat, LAC6KA83) kept in the water at different depths (35 and 120 cm) for 4 h, with or without natural solar UV radiation, except for a day with high UVB irradiance (1.2 W m−2), which decreased the motility at a depth of 35 cm for the two species). Simulated in situ experiments with 2 h natural daylight, with and without natural UV radiation (UVB, 1.6 W m−2), had a dramatic effect on the motility of Gyrodinium aureolum. Artificial UVB radiation from UV lamps (4 h, 2.72 kJ m−2 day−1, biologically effective UVB radiation, UVBBE) in the laboratory decreased the motility of Heterocapsa triquetra (LAC20) by 56% and the two strains of P. minimum (Atlantic, LAC4LI; Kattegat, LAC6KA83) by 43% and 36% respectively; the growth was inhibited for all species, as well as for Amphidinium carterae (LAC1KA83), when organisms were exposed to more than 0.7 kJ m−2 day−1 of UVBBE radiation.},
  author       = {Nielsen, Tom and Björn, Lars Olof and Ekelund, Nils G. A.},
  issn         = {1011-1344},
  language     = {eng},
  number       = {1},
  pages        = {73--79},
  publisher    = {Elsevier},
  series       = {Journal of Photochemistry and Photobiology, B: Biology},
  title        = {Impact of natural and artificial UVB radiation on motility and growth rate of marine dinoflagellates},
  url          = {http://dx.doi.org/10.1016/1011-1344(94)07059-W},
  volume       = {27},
  year         = {1995},
}