Seasonal Changes of Phytoplankton Chlorophyll a, Primary Production and their Relation in the Continental Shelf Area of the South Eastern Black Sea


Agirbas E., FEYZİOĞLU A. M., Kopuz U.

TURKISH JOURNAL OF FISHERIES AND AQUATIC SCIENCES, vol.14, no.3, pp.713-726, 2014 (SCI-Expanded) identifier identifier

Abstract

We describe spatio-temporal variability of primary production (PP) and chlorophyll-a (Chl-a) concentration with environmental parameters during March-December 2010 period in the south-eastern coast of the Black Sea. PP was measured by a combination of 14C in-situ incubation experiments on natural phytoplankton assemblages. Primary production rates, varied notably within water column with 0.1-40 mg cm(-3) d(-1), were always determined in the upper part of the euphotic zone down to the 10% of light intensity depth. The depth-integrated production rates ranged from 285 to 565 mg cm(-2) d(-1) for the coastal station and from 126 to 530 mg cm(-2) d(-1) for the offshore station (ANOVA, P>0.05). The average Chl-a concentrations within the euphotic zone ranged from 0.30 to 3.57 mu g L-1 for the coastal station and from 0.25 to 3.45 mu g L-1 for the offshore station (ANOVA, P<0.01), whereas the levels of depth-integrated Chl-a concentrations in the offshore station (9-80 mg m(-2)) were greater than in the coastal station (10 to 68 mg m(-2)) (ANOVA, P>0.05). The correlation between integrated PP and Chl-a values for the coastal station (r(2)= 0.98; P<0.01) was better than for the offshore station (r(2)= 0.12; P>0.05).