Ecological Role of Microbes

Turk, Valentina; Malkin, Sairah Y.; Celussi, Mauro; Tinta, Tinkara; Cram, Jacob A.; Malfatti, Francesca; Chen, Feng

doi:10.1002/9781119543626.ch7

Cited by 3 publications

(3 citation statements)

References 168 publications

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“…Smaller pelagic organisms such as bacteria near fish farms have access to highly available organic nutrients and have short generation times (Kirchman 2016). Because the generation time of heterotrophic bacteria in the Bay of Piran ranges from 5 to 82 hours (Turk et al 2020), we did not detect differences in bacterial abundance in our 3-hour experiment. Changes in the concentrations of inorganic and organic nutrients mainly affect bacterial production.…”

Section: Discussionmentioning

confidence: 79%

Short-term changes in microbial communities in the water column around the fish farm in the Bay of Piran

Turk,

Tinta

2021

ABS

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A multidisciplinary approach was used to study the impact of fish farming on coastal bacterial communities in the inner part of the Bay of Piran (northern Adriatic). Differences in bacterial abundance, production and the occurrence of selected bacterial groups were studied in the water column around the cage and at different distances from the centre of the fish cage towards the open water, i.e., reference marine station. We also examined the effect of fish feeding on the surrounding system in a short-term in situ experiment based on the simultaneous collection of seawater samples from different locations around the fish cage before and after feeding of fish. Our study suggests that fish feeding has a moderate short-term effect on water column parameters, including bacterial abundance and production, only at a limited distance from the fish cages. The nitrifying, ammonia-oxidizing bacterial groups, as determined by the fluorescent in situ hybridization method, were represented at a higher percentage in the seawater samples in the middle and around the fish cages. β- Proteobacteria, γ-Proteobacteria and the Cytophaga-Flavobacterium group were represented to a higher percentage at sampling sites in the middle of the Bay of Piran and at the reference marine station. The Vibrio group was detected at all sampling sites. The accumulation of organically enriched fish food and waste products releasedinto the seawater during the short-term experiment resulted in a significant increase in particulate matter, orthophosphate and ammonium. In response to the increase in inorganic nutrients, we observed a significant increase in bacterial production, whileno significant differences were observed in bacterial abundance in such short time.

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Section: Discussionmentioning

confidence: 79%

Short-term changes in microbial communities in the water column around the fish farm in the Bay of Piran

Turk,

Tinta

2021

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“…The Chesapeake Bay is the largest estuary in the United States and provides a well‐studied model system characterized by high production and active biogeochemical processes (Turk et al, 2021). The Bay is characterized by high particle abundance, which transports nutrients and carbon through the system (Malpezzi et al, 2013; Palinkas et al, 2019; Sanford et al, 2001).…”

Section: Introductionmentioning

confidence: 99%

Microbial diversity and abundance vary along salinity, oxygen, and particle size gradients in the Chesapeake Bay

Cram,

Hollins,

McCarty

et al. 2024

Environmental Microbiology

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Marine snow and other particles are abundant in estuaries, where they drive biogeochemical transformations and elemental transport. Particles range in size, thereby providing a corresponding gradient of habitats for marine microorganisms. We used standard normalized amplicon sequencing, verified with microscopy, to characterize taxon‐specific microbial abundances, (cells per litre of water and per milligrams of particles), across six particle size classes, ranging from 0.2 to 500 μm, along the main stem of the Chesapeake Bay estuary. Microbial communities varied in salinity, oxygen concentrations, and particle size. Many taxonomic groups were most densely packed on large particles (in cells/mg particles), yet were primarily associated with the smallest particle size class, because small particles made up a substantially larger portion of total particle mass. However, organisms potentially involved in methanotrophy, nitrite oxidation, and sulphate reduction were found primarily on intermediately sized (5–180 μm) particles, where species richness was also highest. All abundant ostensibly free‐living organisms, including SAR11 and Synecococcus, appeared on particles, albeit at lower abundance than in the free‐living fraction, suggesting that aggregation processes may incorporate them into particles. Our approach opens the door to a more quantitative understanding of the microscale and macroscale biogeography of marine microorganisms.

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“…Recent report conducted in a shallow site of the central Red Sea (Silva et al, 2019) agree with this view; the stocks of heterotrophic bacteria were jointly controlled by HNFs and viruses, which seem to alternate their prevalence along the year (Sabbagh et al, 2020). Sampling 1 year in microbial ecology studies is frequently insufficient for understanding the comprehensive long‐term patterns of seasonality (Turk et al, 2020), we further investigated the spatio‐temporal dynamics of bacterioplankton in the Red Sea coastal environment by extending on our previous work conducted in the coastal waters of King Abdullah University of Science and Technology (KAUST) Harbor (Sabbagh et al, 2020) to two additional years of observations. Moreover, the inclusion of an offshore, more pristine location, allow us to identify variations not only arising from seasonality, but also from physico‐chemical gradients.…”

Section: Introductionmentioning

confidence: 99%

Seasonality of top‐down control of bacterioplankton at two central Red Sea sites with different trophic status

Sabbagh

Calleja

Daffonchio

et al. 2023

Environmental Microbiology

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The role of bottom‐up (nutrient availability) and top‐down (grazers and viruses mortality) controls on tropical bacterioplankton have been rarely investigated simultaneously from a seasonal perspective. We have assessed them through monthly samplings over 2 years in inshore and offshore waters of the central Red Sea differing in trophic status. Flow cytometric analysis allowed us to distinguish five groups of heterotrophic bacteria based on physiological properties (nucleic acid content, membrane integrity and active respiration), three groups of cyanobacteria (two populations of Synechococcus and Prochlorococcus), heterotrophic nanoflagellates (HNFs) and three groups of viruses based on nucleic acid content. The dynamics of bacterioplankton and their top‐down controls varied with season and location, being more pronounced in inshore waters. HNFs abundances showed a strong preference for larger prey inshore (r = −0.62 to −0.59, p = 0.001–0.002). Positive relationships between viruses and heterotrophic bacterioplankton abundances were more marked inshore (r = 0.67, p < 0.001) than offshore (r = 0.44, p = 0.03). The negative correlation between HNFs and viruses abundances (r = −0.47, p = 0.02) in shallow waters indicates a persistent seasonal switch between protistan grazing and viral lysis that maintains the low bacterioplankton stocks in the central Red Sea area.

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Ecological Role of Microbes

Cited by 3 publications

References 168 publications

Short-term changes in microbial communities in the water column around the fish farm in the Bay of Piran

Short-term changes in microbial communities in the water column around the fish farm in the Bay of Piran

Microbial diversity and abundance vary along salinity, oxygen, and particle size gradients in the Chesapeake Bay

Seasonality of top‐down control of bacterioplankton at two central Red Sea sites with different trophic status

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