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Seasonal Switching Between Relative Importance of Bottom-Up and Top-Down Control of Bacterial and Heterotrophic Nanoflagellate Abundance

Published online by Cambridge University Press:  11 May 2009

M. Šolić ,
N. Krstulović ,
N. Bojanić ,
I. Marasović  and
Ž. Ninčević
M. Šolić
Affiliation:
Institute of Oceanography and Fisheries, POB 500, 21000 Split, Croatia
N. Krstulović
Affiliation:
Institute of Oceanography and Fisheries, POB 500, 21000 Split, Croatia
N. Bojanić
Affiliation:
Institute of Oceanography and Fisheries, POB 500, 21000 Split, Croatia
I. Marasović
Affiliation:
Institute of Oceanography and Fisheries, POB 500, 21000 Split, Croatia
Ž. Ninčević
Affiliation:
Institute of Oceanography and Fisheries, POB 500, 21000 Split, Croatia
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Extract

Seasonal dynamics of bacterial and heterotrophic nanoflagellate (HNF) species assemblages were analysed in Kaštela Bay (middle Adriatic Sea). Dominant patterns identified were: (1) during summer and autumn bacterial abundance was mainly controlled by HNF grazing (top-down), whereas HNF abundance was controlled by bacterial abundance (bottom-up); (2) during winter and spring the coupling between bacteria and HNF was very weak, and bacterial abundance was mainly controlled by resources supply (bottom-up), whereas HNF abundance was controlled by micro-zooplankton grazing (top-down); (3) throughout the year, both bacterial and HNF species assemblages alternated with two periods of stable abundance, first with high and second with low values; (4) top-down effect was dominant in bacterial switching from stable abundance with high values to stable abundance with low values, whereas bottom-up model dominated in inverse process; and vice versa for HNF.

Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 78 , Issue 3 , August 1998 , pp. 755 - 766
Copyright
Copyright © Marine Biological Association of the United Kingdom 1998

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