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GROWTH, DARK RESPIRATION AND PHOTOSYNTHETIC PARAMETERS OF THE COCCOLITHOPHORID EMILIANIA HUXLEYI (PRYMNESIOPHYCEAE) ACCLIMATED TO DIFFERENT DAY LENGTH‐IRRADIANCE COMBINATIONS 1
Author(s) -
Nielsen Marianne V.
Publication year - 1997
Publication title -
journal of phycology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.85
H-Index - 127
eISSN - 1529-8817
pISSN - 0022-3646
DOI - 10.1111/j.0022-3646.1997.00818.x
Subject(s) - irradiance , emiliania huxleyi , photosynthesis , biology , respiration , respiration rate , acclimatization , botany , chlorophyll a , photosynthetic efficiency , phytoplankton , zoology , atmospheric sciences , ecology , nutrient , physics , optics
Growth, dark respiration rate, photosynthetic parameters, and chemical composition were determined for Emiliania huxleyi (Lohmann) Hay et Mohler acclimated to different combinations of day length (12, 18, 24 h) and irradiance (30, 100, 200, 800 μmol·m −2 ·s −1 ). Specific growth rate (μ, day −1 ) and carbon‐specific dark respiration rate (r C d , day −1 ) were independent of day length, but increased significantly with increasing irradiance. The photosynthetic parameters depended on the initial acclimation day length and irradiance: Chlorophyll a‐specific maximum photosynthetic rate (P m B ) increased up to threefold with decreasing day length and twofold with increasing irradiance. The maximum light utilization coefficient (α B ) and maximum quantum yield (φ m ) increased up to threefold with decreasing day length. α B increased almost four‐fold with decreasing irradiance, whereas φ m was independent of irradiance. Literature data for phytoplankton indicate that P m B consistently increases with increasing irradiance, and day length‐irradiance responses of α B and φ m are species specific. Results from the present experiment and other studies indicate that if day length‐irradiance variability in the photosynthetic parameters are neglected, this may cause an over‐ or underestimation up to a factor of two in the photosynthetic rate estimation based on these parameters.