Počet záznamů: 1  

Growth and mortality of aerobic anoxygenic phototrophs in the North Pacific Subtropical Gyre

  1. 1.
    SYSNO ASEP0585423
    Druh ASEPJ - Článek v odborném periodiku
    Zařazení RIVJ - Článek v odborném periodiku
    Poddruh JČlánek ve WOS
    NázevGrowth and mortality of aerobic anoxygenic phototrophs in the North Pacific Subtropical Gyre
    Tvůrce(i) Koblížek, Michal (MBU-M) RID, ORCID
    Ferrera, I. (ES)
    Kolářová, Eva (MBU-M)
    Duhamel, S. (US)
    Popendorf, K. J. (US)
    Gasol, J. M. (ES)
    Van Mooy, B. A. S. (US)
    Číslo článkue0003224
    Zdroj.dok.Applied and Environmental Microbiology. - : American Society for Microbiology - ISSN 0099-2240
    Roč. 90, č. 4 (2024)
    Poč.str.11 s.
    Jazyk dok.eng - angličtina
    Země vyd.US - Spojené státy americké
    Klíč. slovaphotoheterotrophic bacteria ; photosynthetic bacterium ; oligotrophic gradient ; surface waters ; light ; diversity ; rates ; bacteriochlorophyll ; variability ; phosphorus ; aerobic anoxygenic phototrophs ; bacteriochlorophyll a ; marine bacteria ; North Pacific Subtropical Gyre ; Station ALOHA
    Obor OECDMicrobiology
    CEPGX19-28778X GA ČR - Grantová agentura ČR
    Způsob publikováníOpen access
    Institucionální podporaMBU-M - RVO:61388971
    UT WOS001193248200001
    DOI10.1128/aem.00032-24
    AnotaceAerobic anoxygenic phototrophic (AAP) bacteria harvest light energy using bacteriochlorophyll-containing reaction centers to supplement their mostly heterotrophic metabolism. While their abundance and growth have been intensively studied in coastal environments, much less is known about their activity in oligotrophic open ocean regions. Therefore, we combined in situ sampling in the North Pacific Subtropical Gyre, north of O'ahu island, Hawaii, with two manipulation experiments. Infra-red epifluorescence microscopy documented that AAP bacteria represented approximately 2% of total bacteria in the euphotic zone with the maximum abundance in the upper 50 m. They conducted active photosynthetic electron transport with maximum rates up to 50 electrons per reaction center per second. The in situ decline of bacteriochlorophyll concentration over the daylight period, an estimate of loss rates due to predation, indicated that the AAP bacteria in the upper 50 m of the water column turned over at rates of 0.75-0.90 d-1. This corresponded well with the specific growth rate determined in dilution experiments where AAP bacteria grew at a rate 1.05 +/- 0.09 d-1. An amendment of inorganic nitrogen to obtain N:P = 32 resulted in a more than 10 times increase in AAP abundance over 6 days. The presented data document that AAP bacteria are an active part of the bacterioplankton community in the oligotrophic North Pacific Subtropical Gyre and that their growth was mostly controlled by nitrogen availability and grazing pressure. IMPORTANCE Marine bacteria represent a complex assembly of species with different physiology, metabolism, and substrate preferences. We focus on a specific functional group of marine bacteria called aerobic anoxygenic phototrophs. These photoheterotrophic organisms require organic carbon substrates for growth, but they can also supplement their metabolic needs with light energy captured by bacteriochlorophyll. These bacteria have been intensively studied in coastal regions, but rather less is known about their distribution, growth, and mortality in the oligotrophic open ocean. Therefore, we conducted a suite of measurements in the North Pacific Subtropical Gyre to determine the distribution of these organisms in the water column and their growth and mortality rates. A nutrient amendment experiment showed that aerobic anoxygenic phototrophs were limited by inorganic nitrogen. Despite this, they grew more rapidly than average heterotrophic bacteria, but their growth was balanced by intense grazing pressure.
    PracovištěMikrobiologický ústav
    KontaktEliška Spurná, eliska.spurna@biomed.cas.cz, Tel.: 241 062 231
    Rok sběru2025
    Elektronická adresahttps://journals.asm.org/doi/10.1128/aem.00032-24
Počet záznamů: 1  

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