Dynamics of Aerobic Anoxygenic Phototrophs along the trophic gradient in the central Adriatic Sea

Tomaš, Ana Vrdoljak; Šantić, Danijela; Šolić, Mladen; Ordulj, Marin; Jozić, Slaven; Šestanović, Stefanija; Matić, Frano; Kušpilić, Grozdan; Gladan, Živana Ninčević

doi:10.1016/j.dsr2.2019.06.001

Cited by 14 publications

(24 citation statements)

References 82 publications

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“…Therefore, AAPs might represent up to 10% of total prokaryotes in the open Adriatic Sea. In recent research of AAPs, the abundance, the proportion in total prokaryotes, and biomass decreased along the trophic gradient [45]. Furthermore, these counts were substantially low at the oligotrophic open sea station, especially under 70 m depth.…”

Section: Discussionmentioning

confidence: 90%

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Picoplankton Distribution and Activity in the Deep Waters of the Southern Adriatic Sea

Šantić

Kovačević

Bensi

et al. 2019

Water

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Southern Adriatic (Eastern Mediterranean Sea) is a region strongly dominated by large-scale oceanographic processes and local open-ocean dense water formation. In this study, picoplankton biomass, distribution, and activity were examined during two oceanographic cruises and analyzed in relation to environmental parameters and hydrographic conditions comparing pre and post-winter phases (December 2015, April 2016). Picoplankton density with the domination of autotrophic biomasses was higher in the pre-winter phase when significant amounts of picoaoutotrophs were also found in the meso-and bathy-pelagic layers, while Synechococcus dominated the picoautotrophic group. Higher values of bacterial production and domination of High Nucleic Acid content bacteria (HNA bacteria) were found in deep waters, especially during the post-winter phase, suggesting that bacteria can have an active role in the deep-sea environment. Aerobic anoxygenic phototrophic bacteria accounted for a small proportion of total heterotrophic bacteria but contributed up to 4% of bacterial carbon content. Changes in the picoplankton community were mainly driven by nutrient availability, heterotrophic nanoflagellates abundance, and water mass movements and mixing. Our results suggest that autotrophic and heterotrophic members of the picoplankton community are an important carbon source in the food web in the deep-sea, as well as in the epipelagic layer. Besides, viral lysis may affect the activity of the picoplankton community and enrich the water column with dissolved organic carbon.

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Section: Discussionmentioning

confidence: 90%

“…The biomass of studied picoplankton groups was estimated using the following cell-to-carbon conversion factors: 20 fgC cell -1 for heterotrophic bacteria [42,43], 36 fgC cell −1 for Prochlorococcus [44], 255 fgC cell −1 for Synechococcus [44], and 2590 fgC cell −1 for picoeukatyotes [44] and for AAPs [45].…”

Section: Picoplankton Analysismentioning

confidence: 99%

Picoplankton Distribution and Activity in the Deep Waters of the Southern Adriatic Sea

Šantić

Kovačević

Bensi

et al. 2019

Water

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“…The ecological parameters used in this study have been described in previous publications (Šantić et al, 2017;Vrdoljak Tomaš et al, 2019).…”

Section: Environmental Parametersmentioning

confidence: 99%

“…In addition to abundance, cell size in the samples along the trophic gradient was measured by image analysis of the corresponding DAPIstained images. AAP cell biovolumes were calculated by approximating the most similar geometric shapes, as recently described (Vrdoljak Tomaš et al, 2019).…”

Section: Epifluorescence Microscopymentioning

confidence: 99%

Aerobic anoxygenic phototrophs of the Adriatic Sea

Tomaš

Šantić

Stojan

et al. 2023

Acta Adriat. (Online)

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Aerobic anoxygenic phototrophs are a newly discovered member of the bacterial community in the Adriatic Sea. During the last seven years, when we started to study these organisms, we have collected a considerable number of samples from different environments, from the coast, the estuary, and the open sea. Here we have compiled data from 34 georeferenced study sites from four studies that summarize all that is known about aerobic anoxygenic phototrophs and examine the spatial and vertical distribution and environmental factors affecting this community in the Adriatic Sea. We found horizontal and vertical influences on AAP distribution, mainly salinity, nitrates, chlorophyll a, ammonium, temperature, and soluble reactive phosphorus. Much is known about their ecology in the Adriatic, and with a new survey underway, we will expand our knowledge of their community composition and their role in carbon flux to higher trophic levels.

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“…Similar studies conducted on the off coast of Southern California and Mediterranean sea using real-time quantitative PCR (qPCR) reported that AAP comprises only 1% of total bacterioplankton (Schwalbach and Fuhrman 2005;Lamy et al 2011;Graham et al 2018). More studies of AAP bacteria across the oceans revealed a wide-ranging abundance, comprising of 1-16% in Atlantic (Cottrell et al 2006;Sieracki et al 2006), <5% in North Pacific (Cottrell et al 2006), 24% in South Pacific (Lami et al 2007), 10-14% in Arctic (Boeuf et al 2013), 1-8% in Antarctic (Kirchman et al 2014), 1-24% in Adriatic Sea (Tomaš et al 2019), as well as 5-25% in Delaware estuary (Stegman et al 2014). With such distribution and abundance data of AAP bacteria, it can be said that this community is distributed globally in the marine waters and made up a significant portion of total bacteria in the euphotic zone.…”

Section: Introductionmentioning

confidence: 99%

Distribution and abundance of aerobic anoxygenic phototrophic bacteria in the tropical coastal waters of Gunungkidul, Yogyakarta, Indonesia

2020

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Abstract. Aprilyanto V, Sembiring L, Djohan TS. 2020. Distribution and abundance of aerobic anoxygenic phototrophic bacteria in the tropical coastal waters of Gunungkidul, Yogyakarta, Indonesia. Biodiversitas 21: 5506-5513. Aerobic anoxygenic phototroph (AAP) is a community of bacteria capable of performing anoxygenic photosynthesis in the presence of oxygen. AAP abundance in most oceanic regions signals its ecological importance in marine microbial loop. This study was conducted to reveal the distribution and abundance of AAP in Siung coast, Gunungkidul, Yogyakarta, Indonesia. Total bacterioplankton and AAP were enumerated using acridine orange direct count (AODC) and real-time quantitative PCR (qPCR), respectively. Several water physicochemical parameters as well as dissolved nitrate, ammonium, phosphate, and sulfate were also measured. The results showed that total bacterioplankton was distributed thoroughly in the water column with abundance ranging from 2.5×104 to 3.5×104 cells/mL. Within this total bacterioplankton, AAP ranged from 3.83×102 –7.48×102 cells/mL, comprising about 1% to ~2.5%. Inorganic nutrient concentration, mainly nitrate and phosphate were thought to be the regulating factors to the distribution and abundance of both communities. In conclusion, AAP comprises a relatively low portion of the total bacterioplankton community in the tropical coastal water in Gunungkidul, Yogyakarta.

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Dynamics of Aerobic Anoxygenic Phototrophs along the trophic gradient in the central Adriatic Sea

Cited by 14 publications

References 82 publications

Picoplankton Distribution and Activity in the Deep Waters of the Southern Adriatic Sea

Picoplankton Distribution and Activity in the Deep Waters of the Southern Adriatic Sea

Aerobic anoxygenic phototrophs of the Adriatic Sea

Distribution and abundance of aerobic anoxygenic phototrophic bacteria in the tropical coastal waters of Gunungkidul, Yogyakarta, Indonesia

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