Experimente über die Wirkung von UV-B auf pelagische Fischembryonen in einem Sonnenscheinsimulator

Dethlefsen, Volkert and Tüg, Helmut and Baumann, Marcus and Westernhagen, Hein von and Herbert, Armin (1996) Experimente über die Wirkung von UV-B auf pelagische Fischembryonen in einem Sonnenscheinsimulator. Informationen für die Fischwirtschaft aus der Fischereiforschung, 43(4), pp. 180-186.

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Official URL: http://aquacomm.fcla.edu/4216

Abstract

One of the supposed effects of the observed ozone depletion is the increase of solar UV-B irradiation at the seasurface. This will cause an impact on certain compartments of marine ecosystems. Especially, sensitive developmental stages of pelagic fish embryos might be affected. Embryos of dab (Limanda limanda) and plaice (Pleuronectes plalessa) were experimentally exposed 10 different amounts of UVB irradiation in a sunshine simulator. This programmable device allows the dosage of realistic solar irradiation in quality and guantity. Experiments were carried out in March 1995 and February 1996. Either artificially inserninated and reared emhryos of dab and plaice or embryos caught in the German Bight were exposed to simulated solar irradiation. The 1995 experiments served to identify the effective irradiation dosages. For the 1996 experiments irradiation applied was much lower, being dose to realistic valucs expected over the North Sea as a consequence of ozone depletion. The following end points were studied: 1. Mortality, 2. sublethal morphological effects (malformations), 3. DNA damage, 4. changes in buoyancy of embryos measured as changes in osmolarity of the perivitelline fluid. Conditions for the simulation of daylight were a c1oudless sky with a solar zenith distance of 34 % (air mass 1.2). The adopted ozone depletion was 40 % corresponding to 180 DU (Dobson Units) instead of 300 DU. In the 1995 experiments time and dosage dependent influenccs on mortality and buoyancy of embryos of dab and plaice were found. Even in those embryos which were protected from the UV-B spectral range a loss of buoyancy was registered after 12 hours in the simulator. No diffcrences in DNA integrity as determined by DNA unwinding of exposed and control embryos were found. Also with lower amounts of irradiation in the 1996 experiments dosage dependent acute mortality, malformations, and impact on the buoyancy of the emhryos was registered. Sublethal effects occurred as well in embryos protected against UV-B in the exposure chambers, but were not found in the dark controls. The impact of low dosages of UV-B on the buoyancy of pelagic fish embryos might indicate an important ecological threat and deserves further studies.

Item Type: Article
Title: Experimente über die Wirkung von UV-B auf pelagische Fischembryonen in einem Sonnenscheinsimulator
Personal Creator/Author:
CreatorsEmail
Dethlefsen, Volkert
Tüg, Helmut
Baumann, Marcus
Westernhagen, Hein von
Herbert, Armin
Refereed: No
Journal or Publication Title: Informationen für die Fischwirtschaft aus der Fischereiforschung
Volume: 43
Number: 4
Page Range: pp. 180-186
Date: 1996
ISSN: 1437-5842
Contact Email Address: foe@vti.bund.de
Issuing Agency: Bundesforschungsanstalt für Fischerei
Additional Information: Johann Heinrich von Thünen-Institut, Federal Research Institute for Rural Areas, Forestry and Fisheries began publishing the Informationen aus der Fischereiforschung = Information on Fischery research in 2010
Uncontrolled Keywords: embryo development; external influence; climate change; plaice; sunshine simulator; mortality
Subjects: Biology
Item ID: 4216
Depositing User: Horst Bahl
Date Deposited: 28 Oct 2010 12:13
Last Modified: 10 Nov 2012 18:37
Related URLs:
URI: http://aquaticcommons.org/id/eprint/4216

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