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Publication . Article . 2012

Changes in the planktonic community structure related to trophic conditions: the case study of the northern Adriatic Sea

Dragica Fuks; Ingrid Ivančić; Mirjana Najdek; Davor Lučić; Jakica Njire; Jelena Godrijan; Daniela Marić; +5 Authors
Open Access
English
Published: 01 Aug 2012
Country: Croatia
Abstract

Abstract Differentiation of the plankton food web structure was studied during the 2003–2008 period, in situations when the system of the northern Adriatic Sea, one of the most productive area in the Mediterranean, switched from low nutrient to higher nutrient regime. The biomass distribution between autotrophs, bacteria, protozoans and metazoans showed that within the upper part of the water column the microbial food web was developed during the stratification period (May–September) in oligotrophic conditions, with a larger heterotrophic/autotrophic (H/A) ratio in the western (1.4–1.7) than in the eastern part (1.2–1.5). Classical food web patterns (H/A 0.3–0.7) were observed when additional nutrient supply by freshwater (stratification period) or/and by mixing throughout the water column (November–March) occurred. However, while the stratification period with freshets (originated from the Po River outflow) was characterized by an increased biomass of autotrophs and heterotrophs, there was a reduction of biomasses during the mixing period, indicating increased carbon export from the area. In the bottom layer heterotrophs were not able to use the excess of autotrophic production, hence probably a part of autotrophs sank to the sediments fuelling benthic communities. Moreover, recurrently higher metazoans than protozoans biomass ratios suggested the occurrence of herbivorous and microbial grazing modes of metazoans.

Subjects by Vocabulary

Microsoft Academic Graph classification: Oceanography Autotroph Biology Trophic level Benthic zone Water column Biomass (ecology) Microbial food web Plankton Food web Ecology

Subjects

biomass pyramid; chl a; bacteria; heterotrophic flagellates; ciliated protozoans; metazoans; northern Adriatic Sea, Aquatic Science, Ecology, Evolution, Behavior and Systematics, Oceanography, Interdisciplinary Natural Sciences, Marine Science

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Funded byView all
MZOS| Interaction between bicenoses in open water and coastal systems of the Adriatic
Project
  • Funder: Ministry of Science, Education and Sports of the Republic of Croatia (MSES) (MZOS)
  • Project Code: 275-0982705-3047
,
MZOS| Structure and physiology of microbial communities in northern Adriatic fronts
Project
  • Funder: Ministry of Science, Education and Sports of the Republic of Croatia (MSES) (MZOS)
  • Project Code: 098-0982705-2729
,
MZOS| Mechanism of long-term changes in the northern Adriatic ecosystem
Project
  • Funder: Ministry of Science, Education and Sports of the Republic of Croatia (MSES) (MZOS)
  • Project Code: 098-0982705-2731
,
MZOS| Interaction between bicenoses in open water and coastal systems of the Adriatic
Project
  • Funder: Ministry of Science, Education and Sports of the Republic of Croatia (MSES) (MZOS)
  • Project Code: 275-0982705-3047
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