Microbial plankton communities in the coastal southeastern Black Sea: biomass, composition and trophic interactions
| Autor: | Ertugrul Agirbas, Ülgen Aytan, Elaine S. Fileman, Ali Muzaffer Feyzioglu, André Valente |
|---|---|
| Přispěvatelé: | Repositório da Universidade de Lisboa |
| Rok vydání: | 2018 |
| Předmět: |
0106 biological sciences
Atmospheric Science 010504 meteorology & atmospheric sciences Heterotroph Ocean Engineering Aquatic Science Biology Oceanography 01 natural sciences lcsh:Oceanography Phytoplankton lcsh:GC1-1581 14. Life underwater Autotroph Carbon biomass 0105 earth and related environmental sciences Trophic level Biomass (ecology) Microbial food web Ecology 010604 marine biology & hydrobiology fungi Plankton Food web Grazing Black Sea 13. Climate action Microzooplankton |
| Zdroj: | Oceanologia Repositório Científico de Acesso Aberto de Portugal Repositório Científico de Acesso Aberto de Portugal (RCAAP) instacron:RCAAP Oceanologia, Vol 60, Iss 2, Pp 139-152 (2018) |
| ISSN: | 0078-3234 |
| DOI: | 10.1016/j.oceano.2017.09.002 |
| Popis: | Summary: We investigated biomass and composition of the pico-, nano- and microplankton communities in a coastal station of the southeastern Black Sea during 2011. We also examined trophic interactions within these communities from size-fractionated dilution experiments in February, June and December. Autotrophic and heterotrophic biomasses showed similar seasonal trends, with a peak in June, but heterotrophs dominated throughout the year. Autotrophic biomass was mainly comprised by nanoflagellates and diatoms in the first half of the year, and by dinoflagellates and Synechococcus spp. in the second half. Heterotrophic biomass was mostly dominated by heterotrophic bacteria, followed by nanoflagellates and microzooplankton. Dilution experiments suggest that nano- and microzooplankton were significant consumers of autotrophs and heterotrophic bacteria. More than 100% of bacterial production was consumed by grazers in all experiments, while 46%, 21% and 30% of daily primary production were consumed in February, June and December, respectively. In February, autotrophs were the main carbon source, but in December, it was heterotrophic bacteria. An intermediate situation was observed in June, with similar carbon flows from autotrophs and heterotrophic bacteria. Size-fraction dilution experiments suggested that heterotrophic nanoflagellates are an important link between the high heterotrophic bacterial biomass and microzooplankton. In summary, these results indicate that nano- and microzooplankton were responsible for comprising a significant fraction of total microbial plankton biomass, standing stocks, growth and grazing processes. This suggests that in 2011, the microbial food web was an important compartment of the planktonic food web in the coastal southeastern Black Sea. Keywords: Phytoplankton, Microzooplankton, Carbon biomass, Microbial food web, Grazing, Black Sea |
| Databáze: | OpenAIRE |
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