Marine Biology

, Volume 50, Issue 4, pp 319–332 | Cite as

Growth patterns of Codium fragile ssp. tomentosoides in response to temperature, irradiance, salinity, and nitrogen source

  • M. D. Hanisak


Seasonal patterns of growth, reproduction, and productivity of Codium fragile spp. tomentosoides (van Goor) Silva were monitored at 3 locations in Rhode Island. Maximal growth occurred during the summer and was more significantly correlated with temperature than any other factor measured in this study. Multiple correlation models suggested an interaction between temperature, irradiance, and available nitrogen. Maximal reproduction occurred in late summer and early fall. The maximal productivity, based on harvested quadrats, was 2. 10 g dry weight m-2 day-1. A large amount (up to 87.3%) of the annual production entered the detrital food chain during the winter by fragmentation of the thallus. Culture studies examined the effects of temperature (6° to 30°C), irradiance (7 to 140 μE m-2 sec-1), daylength (8 h light: 16 h dark to 24 h light: O h dark) and salinity (6 to 48‰) on growth. Differentiated thalli grew over a broad range of experimental conditions, with maximal growth at 24°C, 24 to 30‰ S, a minimal irradiance of 28 μE m-2 sec-1, and 16 h daylength. The effect of increasing daylength was due to increased total daily irradiance rather than to a true photoperiodic effect. Undifferentiated sporelings survived and grew in a narrower range of environmental conditions than thalli. c. fragile spp. tomentosoides grew equally well with nitrate, nitrite, ammonium, and urea as a nitrogen source. The addition of NaHCO3 stimulated growth at levels of 2.4 to 4.8 mM, suggesting an inorganic carbon limitation in static cultures. This study supports the hypothesis that the in situ seasonal growth pattern of c. fragile spp. tomentosoides is primarily due to the interaction of temperature and irradiance.


Nitrite Nitrogen Source Inorganic Carbon Maximal Growth Multiple Correlation Model 
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Copyright information

© Springer-Verlag 1979

Authors and Affiliations

  • M. D. Hanisak
    • 1
    • 2
  1. 1.Department of BotanyUniversity of Rhode IslandKingstonUSA
  2. 2.Harbor Branch FoundationFort PierceUSA

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