Influence des conditions hivernales sur les productions phyto- et zooplanctoniques en Méditerranée Nord-Occidentale. IV. Distribution verticale des taux d'adénosine triphosphate et de production primaire

✍ Scribed by P. L. Laborde; H. J. Minas

• Publisher: Springer-Verlag
• Year: 1974
• Tongue: English
• Weight: 798 KB
• Volume: 25
• Category: Article
• ISSN: 0025-3162
• DOI: 10.1007/bf00394966

✦ Synopsis

Influence of Winter Conditions on Phyto-and Zooplankton Production in the Northwestern Mediterranean. IV. Vertical Distribution o/ Concentrations o] Adenosine Triphosphate and

Primary Production Vertical distribution of daily primary production rates and adenosine triphosphate (ATP) concentrations were observed during two periods (7--17 March, and 4---14 April, i969), at a fixed station in the northern Mediterranean Sea (CNEXO Laboratory Buoy). The ATP values and the 14Cuptake rates increased daily during the two observation periods; this increase is compared to variations in hydrological conditions. Vertical profiles of both photosynthetic activity and biomass (ATP) revealed a subsuperficial maximum. The ATP maximum is usually below the photosynthetic maximum, especially when the values of both parameters are high. The probable origin of the ATP maximum and its relation to the production maximum are discussed. A conversion of the ATP values in terms of chlorophyll a, on the basis of t mg ATP = 250 mgC and t mg chlorophyll a = 60 mgC, leads to relatively high values of the productivity index (2.4 to 14 mgC. mgChl a -1. h-l).