Impact of UV-radiation on viability, photosynthetic characteristics and DNA of brown algal zoospores:implications for depth zonation

Measurements of photosynthesis, germination capacity and assessment of DNA damage were carried out in the laboratory to determine the effect of different conditions of ultraviolet (UV) and photosynthetically active radiation (PAR) on zoospores of various large brown algae collected on Spitsbergen (S...

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Bibliographic Details
Published in:Marine Ecology Progress Series
Main Authors: Wiencke, C, Gomez, I, Pakker, H, Flores-Moya, A, Altamirano, M, Hanelt, D, Bischof, K, Figueroa, FL
Format: Article in Journal/Newspaper
Language:English
Published: 2000
Subjects:
macroalgae
Laminaria
arctic
zoospores
UV-radiation
DNA damage
photosynthesis
LAMINARIA SPECIES PHAEOPHYCEAE
HELGOLAND NORTH-SEA
LIFE-HISTORY STAGES
ULTRAVIOLET-RADIATION
CHLOROPHYLL FLUORESCENCE
SOLAR-RADIATION
B RADIATION
MARINE-PHYTOPLANKTON
SUBLITTORAL REGION
ARCTIC MACROALGAE
Arctic
Helgoland
Svalbard
Phytoplankton
Spitsbergen
Online Access:https://hdl.handle.net/11370/89754e15-bfaf-4e83-a4a1-31d11b1daf44
https://research.rug.nl/en/publications/89754e15-bfaf-4e83-a4a1-31d11b1daf44
https://doi.org/10.3354/meps197217
https://pure.rug.nl/ws/files/62524727/Impact_of_UV_radiation_on_viability_photosynthetic_characteristics.pdf
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Summary:Measurements of photosynthesis, germination capacity and assessment of DNA damage were carried out in the laboratory to determine the effect of different conditions of ultraviolet (UV) and photosynthetically active radiation (PAR) on zoospores of various large brown algae collected on Spitsbergen (Svalbard, High Arctic) and Tarifa (Cadiz, southern Spain). Results were correlated to in situ light conditions and indicated that zoospores suffer photoinhibition of photosynthesis, loss of viability and DNA damage in relation to the growth depth of parental sporophytes. At both sites, germination capacity of zoospores in species collected in deep waters was more strongly impaired after exposure to the same UV doses than in species from shallower waters. In general, zoospores exposed to PAR+UVA+UVB showed higher mortality rates than after exposure to PAR+UVA or PAR alone. For Laminaria digitata from Spitsbergen, it was found that the loss of zoospore viability is the result of DNA damage and photodamage of the photosynthetic apparatus. UVB irradiances occurring in southern Spain at water depths shallower than 7 m prevented the germination of spores of deep water Laminariales from this region.

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