caa a22 4500 465763766 CHVBK 20180323111907.0 cr unu---uuuuu 170327e19901001xx s 000 0 eng 10.1007/BF00239374 doi (NATIONALLICENCE)springer-10.1007/BF00239374 Light-temperature interactions on the growth of Antarctic diatoms [Elektronische Daten] [Michel Fiala, Louise Oriol] Summary: The combined effect of various temperatures and light intensities on the growth of seven species of antarctic diatoms in culture has been studied. With the exception of Chaetoceros deflandrei whose thermal tolerance is fairly good, these obligatory psychrophils cannot survive in temperatures above 6° to 9° C. Their mean growth rate is relatively low, between 0.24 div d−1 for Corethron criophilum and 0.63 div d−1 for C. deflandrei. Regardless of light intensity, growth rate increased with the temperature to reach a maximum between 3° and 5° C. The highest rates were obtained between 115 and 220 μmol m−2 s−1 with 0.38 div d−1 for C. criophilum, 0.56 div d−1 for Synedra sp. and between 0.71 and 0.88 div d−1 for the other 5 species. A reduction in light intensity from 220 to 46 μmol m−2 s−1 slowed growth by nearly 50%. These results suggest that the combined effect of temperature and light is one of the factors involved in the limitation of antarctic phytoplankton growth. The low temperatures of the environment do not permit rapid growth, which, even under optimal light conditions remains low. In addition, in the euphotic layer, the overall light energy available for algae is considerably reduced due to turbulence, a factor which exacerbates the reduced growth rate. Springer-Verlag, 1990 Fiala Michel Laboratoire Arago, Université Pierre et Marie Curie, UA CNRS 117, F-66650, Banyuls-sur-Mer, France aut Oriol Louise Laboratoire Arago, Université Pierre et Marie Curie, UA CNRS 117, F-66650, Banyuls-sur-Mer, France aut Polar Biology Springer-Verlag 10/8(1990-10-01), 629-636 0722-4060 10:8<629 1990 10 300 https://doi.org/10.1007/BF00239374 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00239374 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Fiala Michel Laboratoire Arago, Université Pierre et Marie Curie, UA CNRS 117, F-66650, Banyuls-sur-Mer, France aut NATIONALLICENCE 700 1- Oriol Louise Laboratoire Arago, Université Pierre et Marie Curie, UA CNRS 117, F-66650, Banyuls-sur-Mer, France aut NATIONALLICENCE 773 0- Polar Biology Springer-Verlag 10/8(1990-10-01), 629-636 0722-4060 10:8<629 1990 10 300 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer