Accession Number:

ADA230378

Title:

Northern Lights: A Study of Bioluminescence in a High Latitude Norwegian Fjord

Descriptive Note:

Corporate Author:

NAVAL OCEANOGRAPHIC AND ATMOSPHERIC RESEARCH LAB STENNIS SPACE CENTER MS

Report Date:

1990-01-01

Pagination or Media Count:

1.0

Abstract:

An oceanographic cruise NORTHERN LIGHT was conducted during October 1989 in Vestfjord, Norway, to determine causes for spatial and temporal variability of bioluminescence at the end of the fall plankton bloom. Profiles of bioluminescence, chlorophyll fluorescence, beam attenuation coefficient and temperature suggested three different bioluminescence-related water types. Upper fjord and western fjord water showed high amounts of bioluminescence in the upper 10 to 20 m coinciding with a shallow thermocline and strong correlations among bioluminescence intensities, abundance of bioluminescence dinoflagellates and chlorophyll fluorescence. Eastern fjord water exhibited an intermediate bioluminescence potential with no pronounced stratification to 100 m depth bioluminescence, abundances of bioluminescence dinoflagellates and chlorophyll fluorescence. Chlorophyll fluorescence was highly correlated with beam attenuation for all three water types. Correlations among profiles variables, when compared with previous data form August 1985 and 1986, are indicative of different water column temperature structures, lower integrated bioluminescence intensities, and shifts in numerical abundances of luminescent organisms. It appears that bioluminescence as well as beam attenuation when bioluminescence potential is predominantly dinoflagellates in origin. js

Subject Categories:

  • Biology

Distribution Statement:

APPROVED FOR PUBLIC RELEASE