Growth response of an estuarine diatom (Melosira nummuloides (Dillw. )Ag. ) to UV-B (290-320 nm) radiation
An increase in the transmission of solar radiation in the UV-B region (specifically, 290 to 320 nm) is expected to occur as a result of anthropogenic degradation of stratospheric ozone. The potential impact of increased levels of UV-B radiation upon the biosphere is of ecological concern. In a previous study a community of estuarine organisms received a daily exposure to a simulated solar spectrum enhanced in UV-B radiation for a period of six weeks. A dominant species of diatom growing at the surface of these communities were isolated and identified to be Melosira nummuloides. Short chains of this diatom were irradiated for a four-hour period on each of three consecutive days. Fluorescent sunlamps filtered by a 290 mm cut-off filter (0.13 to 0.50 mm cellulose acetate) or a 315 nm cut-off filter (0.13 mm Mylar S) provided a range of fluence which closely approximated natural fluence levels. A least squares regression analysis of the number of cell divisions on the biologically weighted fluence indicated a significant depression in the growth of this scies by radiation in the 290 to 320 nm waveband.
- Research Organization:
- Oregon State Univ., Corvallis
- OSTI ID:
- 5409822
- Journal Information:
- Estuaries; (United States), Journal Name: Estuaries; (United States) Vol. 3:1; ISSN ESTUD
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
500200 -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
560154* -- Radiation Effects on Animals-- Basic Studies-- (-1987)
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
ALGAE
AQUATIC ECOSYSTEMS
BIOLOGICAL EFFECTS
BIOLOGICAL RADIATION EFFECTS
CELL DIVISION
DIATOMS
ECOSYSTEMS
ELECTROMAGNETIC RADIATION
FLUORESCENT LAMPS
GROWTH
LEAST SQUARE FIT
LIGHT BULBS
MAXIMUM-LIKELIHOOD FIT
MITOSIS
NUMERICAL SOLUTION
PLANTS
RADIATION EFFECTS
RADIATIONS
ULTRAVIOLET RADIATION
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
560154* -- Radiation Effects on Animals-- Basic Studies-- (-1987)
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
ALGAE
AQUATIC ECOSYSTEMS
BIOLOGICAL EFFECTS
BIOLOGICAL RADIATION EFFECTS
CELL DIVISION
DIATOMS
ECOSYSTEMS
ELECTROMAGNETIC RADIATION
FLUORESCENT LAMPS
GROWTH
LEAST SQUARE FIT
LIGHT BULBS
MAXIMUM-LIKELIHOOD FIT
MITOSIS
NUMERICAL SOLUTION
PLANTS
RADIATION EFFECTS
RADIATIONS
ULTRAVIOLET RADIATION