Simultaneous Study of the Growth and Grazing Mortality Rates of Microbial Food Web Components in a Mediterranean Coastal Lagoon
The abundances of 17 cytometric groups encompassing four groups of bacteria, three groups of cyanobacteria, six groups of eukaryotic picophytoplankton (<2–3 µm), and four groups of small eukaryotic nanophytoplankton (between 3 and 6 µm) were studied in the Thau Lagoon across different seasonal co...
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| Format: | Article |
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MDPI AG
2022-03-01
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| Series: | Diversity |
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| Online Access: | https://www.mdpi.com/1424-2818/14/3/186 |
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| author | David Pecqueur Justine Courboulès Cécile Roques Sébastien Mas Romain Pete Francesca Vidussi Behzad Mostajir |
| author_facet | David Pecqueur Justine Courboulès Cécile Roques Sébastien Mas Romain Pete Francesca Vidussi Behzad Mostajir |
| author_sort | David Pecqueur |
| collection | DOAJ |
| description | The abundances of 17 cytometric groups encompassing four groups of bacteria, three groups of cyanobacteria, six groups of eukaryotic picophytoplankton (<2–3 µm), and four groups of small eukaryotic nanophytoplankton (between 3 and 6 µm) were studied in the Thau Lagoon across different seasonal conditions. Among them, the growth (µ) and mortality rates due to grazing (g) of 12 groups of bacteria, cyanobacteria, and eukaryotic pico- and nanophytoplankton were simultaneously studied in the Thau Lagoon via four dilution experiments across different seasonal conditions. The abundances of heterotrophic flagellates and ciliates and their potential predators were studied and linked to prey mortality. Bacteria were more active than phytoplankton and displayed the highest growth and grazing mortality rates. Most studied groups had g:µ ratios > 1, suggesting that predators efficiently grazed and transferred these preys. Surprisingly, the observed variations in predator abundance across seasons did not necessarily correspond with changes in grazing pressure. The significant positive relationship found between water temperature and bacterial grazing mortality rates and the reverse trend observed for larger eukaryotic prey suggested that warmer water increases small prokaryote transfer to higher trophic levels but disadvantages larger eukaryotic prey transfer. |
| first_indexed | 2024-03-09T19:56:09Z |
| format | Article |
| id | doaj.art-b0b67bb4aa3947d58bcbf692612f606f |
| institution | Directory Open Access Journal |
| issn | 1424-2818 |
| language | English |
| last_indexed | 2024-03-09T19:56:09Z |
| publishDate | 2022-03-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Diversity |
| spelling | doaj.art-b0b67bb4aa3947d58bcbf692612f606f2023-11-24T00:57:18ZengMDPI AGDiversity1424-28182022-03-0114318610.3390/d14030186Simultaneous Study of the Growth and Grazing Mortality Rates of Microbial Food Web Components in a Mediterranean Coastal LagoonDavid Pecqueur0Justine Courboulès1Cécile Roques2Sébastien Mas3Romain Pete4Francesca Vidussi5Behzad Mostajir6Sorbonne Université, CNRS (Centre National de la Recherche Scientifique), Observatoire Océanologique de Banyuls-sur-Mer, FR 3724, 66650 Banyuls-sur-Mer, FranceMARBEC (Marine Biodiversity, Exploitation and Conservation), University Montpellier, CNRS, Ifremer, IRD, 34095 Montpellier, FranceMARBEC (Marine Biodiversity, Exploitation and Conservation), University Montpellier, CNRS, Ifremer, IRD, 34095 Montpellier, FranceMEDIMEER (Mediterranean Platform for Marine Ecosystems Experimental Research), OSU OREME, University Montpellier, CNRS, IRD, INRAE, 34200 Sète, FranceSMBT, Syndicat mixte du bassin de Thau, 34400 Sète, FranceMARBEC (Marine Biodiversity, Exploitation and Conservation), University Montpellier, CNRS, Ifremer, IRD, 34095 Montpellier, FranceMARBEC (Marine Biodiversity, Exploitation and Conservation), University Montpellier, CNRS, Ifremer, IRD, 34095 Montpellier, FranceThe abundances of 17 cytometric groups encompassing four groups of bacteria, three groups of cyanobacteria, six groups of eukaryotic picophytoplankton (<2–3 µm), and four groups of small eukaryotic nanophytoplankton (between 3 and 6 µm) were studied in the Thau Lagoon across different seasonal conditions. Among them, the growth (µ) and mortality rates due to grazing (g) of 12 groups of bacteria, cyanobacteria, and eukaryotic pico- and nanophytoplankton were simultaneously studied in the Thau Lagoon via four dilution experiments across different seasonal conditions. The abundances of heterotrophic flagellates and ciliates and their potential predators were studied and linked to prey mortality. Bacteria were more active than phytoplankton and displayed the highest growth and grazing mortality rates. Most studied groups had g:µ ratios > 1, suggesting that predators efficiently grazed and transferred these preys. Surprisingly, the observed variations in predator abundance across seasons did not necessarily correspond with changes in grazing pressure. The significant positive relationship found between water temperature and bacterial grazing mortality rates and the reverse trend observed for larger eukaryotic prey suggested that warmer water increases small prokaryote transfer to higher trophic levels but disadvantages larger eukaryotic prey transfer.https://www.mdpi.com/1424-2818/14/3/186bacteriadilutionfood webgrowthgrazingMediterranean coastal lagoon |
| spellingShingle | David Pecqueur Justine Courboulès Cécile Roques Sébastien Mas Romain Pete Francesca Vidussi Behzad Mostajir Simultaneous Study of the Growth and Grazing Mortality Rates of Microbial Food Web Components in a Mediterranean Coastal Lagoon Diversity bacteria dilution food web growth grazing Mediterranean coastal lagoon |
| title | Simultaneous Study of the Growth and Grazing Mortality Rates of Microbial Food Web Components in a Mediterranean Coastal Lagoon |
| title_full | Simultaneous Study of the Growth and Grazing Mortality Rates of Microbial Food Web Components in a Mediterranean Coastal Lagoon |
| title_fullStr | Simultaneous Study of the Growth and Grazing Mortality Rates of Microbial Food Web Components in a Mediterranean Coastal Lagoon |
| title_full_unstemmed | Simultaneous Study of the Growth and Grazing Mortality Rates of Microbial Food Web Components in a Mediterranean Coastal Lagoon |
| title_short | Simultaneous Study of the Growth and Grazing Mortality Rates of Microbial Food Web Components in a Mediterranean Coastal Lagoon |
| title_sort | simultaneous study of the growth and grazing mortality rates of microbial food web components in a mediterranean coastal lagoon |
| topic | bacteria dilution food web growth grazing Mediterranean coastal lagoon |
| url | https://www.mdpi.com/1424-2818/14/3/186 |
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