caa a22 4500 465763510 CHVBK 20180323111906.0 cr unu---uuuuu 170327e19900801xx s 000 0 eng 10.1007/BF00233699 doi (NATIONALLICENCE)springer-10.1007/BF00233699 Photosynthetic parameters of the entire euphotic phytoplankton of the Bransfield Strait, Summer 1985 [Elektronische Daten] [Sergio Cabrera, Vivian Montecino] Summary: The photosynthetic parameters αB, PBm, and Ik were derived from the relationship between primary productivity (P) and irradiance (I) for mixed samples, each mixture consisting of seven samples of phytoplankton collected from different depths, between the surface and 35 m at eight different sampling stations in the Bransfield Strait in January-February 1985. The αB values obtained in this study were considerably higher than those generally reported for phytoplankton from a single depth in polar waters. These higher values may be attributed to the fact that most of the phytoplankton in the mixed samples came from depths with limiting irradiances, which had a greater yield than surface phytoplankton. The PBm value we obtained was lower than that reported by other authors, possibly because the mixed sample phytoplankton have saturation points at low light intensity. Our IK values confirmed the ability of phytoplankton in these latitudes to reach maximum photosynthesis rates with low densities of photonic flux. When treated as independent parameters, the αB and P m B values showed a significant correlation for each sampling station. The efficiency of the entire euphotic phytoplankton of the water column, estimated as ∫ 0 eu Pdz/∫ 0 eu Bdz or Integral Assimilation Number (IAN), showed a predictable significant correlation with the αB values calculated from the entire euphotic phytoplankton. Areas with high surface biomass were as productive as those with low surface phytoplankton biomass. Areas with low surface phytoplankton biomass showed higher αB values than areas with high surface biomass, which suggests, that, the αB values for the entire photosynthesizing phytoplankton in the water column may have greater predictive value than the αB values for the phytoplankton from a single depth. This finding should be taken into account when satellites are used for studying marine production processes, especially in areas with very different euphotic depths and surface phytoplankton concentrations. Springer-Verlag, 1990 Cabrera Sergio Department of Cellular Biology and Genetics, Faculty of Medicine, University of Chile, 70061-7, Casilla, Santiago, Chile aut Montecino Vivian Department of Ecological Sciences, Faculty of Sciences, University of Chile, 653, Casilla, Santiago, Chile aut Polar Biology Springer-Verlag 10/7(1990-08-01), 507-513 0722-4060 10:7<507 1990 10 300 https://doi.org/10.1007/BF00233699 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00233699 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Cabrera Sergio Department of Cellular Biology and Genetics, Faculty of Medicine, University of Chile, 70061-7, Casilla, Santiago, Chile aut NATIONALLICENCE 700 1- Montecino Vivian Department of Ecological Sciences, Faculty of Sciences, University of Chile, 653, Casilla, Santiago, Chile aut NATIONALLICENCE 773 0- Polar Biology Springer-Verlag 10/7(1990-08-01), 507-513 0722-4060 10:7<507 1990 10 300 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer