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Role of Bacteria in the Carbon and Nitrogen Flow between Water‐Column and Sediment in a Shallow Marine Bay (Bay of Piran, Northern Adriatic Sea)
Author(s) -
Herndl G. J.,
Faganeli J.,
Fanuko N.,
Peduzzi P.,
Turk V.
Publication year - 1987
Publication title -
marine ecology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.668
H-Index - 58
eISSN - 1439-0485
pISSN - 0173-9565
DOI - 10.1111/j.1439-0485.1987.tb00185.x
Subject(s) - water column , bay , phytoplankton , sediment , bacterioplankton , oceanography , environmental science , environmental chemistry , seawater , total organic carbon , nitrogen , chemistry , nutrient , geology , ecology , biology , organic chemistry , paleontology
. The interdependences between phytoplankton standing crop, bacterial biomass and the dissolved organic matter (DOM) pool in the water column were investigated and related to sediment parameters in a shallow marine bay (Bay of Piran, Northern Adriatic Sea) over an annual cycle. Bacterioplankton density varied between 1–10 × 10 5 cells ml ‐1 , with lowest density observed in March corresponding to the low Chi a concentrations during this period. Generation times as determined by dialysis incubations ranged between 4h (June) and 82 h (March). Mean bacterial secondary production rates during summer were about 40 mg C m ‐1 d ‐1 and 5mg C m ‐3. d ‐1 during winter. With a short time lag, DOM concentrations followed the fluctuation in Chi a. Sediment oxygen demand measurements revealed a mean mineralization rate of about 260 mg C m ‐2 d ‐1 during summer and 100–200 mg C m ‐2 d ‐1 in winter. Sediment bacterial density varied between 10 8 ‐ 10 9 cells g (sediment dry wt) ‐1 in the top 5 cm sediment layer or, in terms of biomass, 4.3 g C m ‐l during summer and 0.6 g C m ‐2 during winter. Highest concentrations of DOM in pore waters were measured in September, coinciding with high rates of sediment oxygen demand.