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Seasonal variation in light- and temperature-dependent growth of marine planktonic diatoms in in situ dialysis cultures in the Trondheimsfjord, Norway (63 degree N)
Hegseth, E.N.; Sakshaug, E. (1983). Seasonal variation in light- and temperature-dependent growth of marine planktonic diatoms in in situ dialysis cultures in the Trondheimsfjord, Norway (63 degree N). J. Exp. Mar. Biol. Ecol. 67: 199-220
In: Journal of Experimental Marine Biology and Ecology. Elsevier: New York. ISSN 0022-0981, more
Peer reviewed article  

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Keywords
    Biochemical composition; Chemical composition; Cultured organisms; Growth; Light; Light effects; Seasonal variations; Temperature; Temperature effects; Skeletonema costatum (Greville) Cleve, 1873 [WoRMS]; Thalassiosira gravida Cleve, 1896 [WoRMS]; Thalassiosira pseudonana Hasle & Heimdal, 1970 [WoRMS]; ANE, Norway, Trondheimsfjord [Marine Regions]; Marine

Authors  Top 
  • Hegseth, E.N.
  • Sakshaug, E.

Abstract
    Three species of diatoms, Skeletonema costatum (Grev.) Cleve, Thalassiosira gravida Cleve, and T. Pseudonana (Hustedt) Hasle et Heimdal, were grown in in situ dialysis culture in the Trondheimsfjord at depths of 0.5 and 4 m. The rates of growth and the chemical composition of exponentially growing cells were monitored and related to seasonal changes in illumination and temperature. Functions correlating growth rate with temperature were deduced. Growth took place from February to November. During this period temperature ranged from -1 to 16 degree C, the average photon flux density (I) )per 24h) from 9 to 570 mu E less than or equal to m-2 less than or equal to s-1 (0.5 m depth), and the length of the days (I > 1 mu E less than or equal to m-2 degree s-1)) from 6 to 24 h. Light-limited growth was evident when the product of the average daily light and the chlorophyll/N ratio was < 10; this occurred mostly in early spring and late autumn. Peak densities (> 800 for the Thalassiosira spp. and > 1300-1400 mu E less than or equal to m super-2 less than or equal to s-1 for Skeletonema ) seem to inhibit growth. The highest rates recorded were approximately equals 1.6 doubl. less than or equal to day-1 (July, 15-16 degree C). The three species also exhibited different ecological behaviour.

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