Bacterial community succession in response to dissolved organic matter released from live jellyfish

2019 ◽  
Vol 37 (4) ◽  
pp. 1229-1244 ◽  
Author(s):  
Wenjin Hao ◽  
Antje Wichels ◽  
Bernhardt Fuchs ◽  
Xuexi Tang ◽  
Gunnar Gerdts
Keyword(s):  
Organic Matter ◽  
Bacterial Community ◽  
Dissolved Organic Matter ◽  
Community Succession

scholarly journals Linking Shifts in Bacterial Community Composition and Function with Changes in the Dissolved Organic Matter Pool in Ice-Covered Baiyangdian Lake, Northern China

2020 ◽  
Vol 8 (6) ◽  
pp. 883
Author(s):  
Shilei Zhou ◽  
Yue Sun ◽  
Minghui Yu ◽  
Zhenpeng Shi ◽  
Hang Zhang ◽  
...  
Keyword(s):  
Organic Matter ◽  
Bacterial Community ◽  
Dissolved Organic Matter ◽  
Bacterial Community Composition ◽  
Environmental Parameters ◽  
Northern China ◽  
Mantel Test ◽  
Biological Index ◽  
Linear Discriminant ◽  
Baiyangdian Lake

The relationship between CDOM (Chromophoric dissolved organic matter) and the bacterial community was investigated in ice-covered Baiyangdian Lake. The results showed that environmental parameters significantly differed in Baiyangdian Lake, whereas a-diversity was not significantly different. Moreover, the microbial and functional communities exhibited significant differences, and T (Temperature), pH, ORP (Oxidation-reduction potential), DO (Dissolved oxygen), NO3−-N, NH4+-N, and Mn (Manganese) were the main environmental factors of these differences, based on redundancy analysis and the Mantel test. Biomarkers of the microbial and functional communities were investigated through linear discriminant analysis effect size and STAMP analysis. The number of biomarkers in the natural area was highest among the typical zones, and most top functions were related to carbohydrate metabolism. Two protein-like components (C1 and C2) and one humic-like component (C3) were identified by parallel factor analysis, and C1 was positively related to C2 (R = 0.99, p < 0.001), indicating the same sources. Moreover, CDOM significantly differed among the typical zones (p < 0.001). The high biological index, fluorescence index, β:α, and low humification index indicated a strong autochthonous component and aquatic bacterial origin, which was consistent with the results of UV-vis absorption spectroscopy. Network analysis revealed non-random co-occurrence patterns. The bacterial and functional communities interacted closely with CDOM. The dominant genera were CL500-29_marine_group, Flavobacterium, Limnohabitans, and Candidatus_Aquirestis. Random forest analysis showed that C1, C2, and C3 are important predictors of α- and β-diversity in the water bacterial community and its functional composition. This study provides insight into the interaction between bacterial communities and DOM (Dissolved organic matter) in ice-covered Baiyangdian Lake.

scholarly journals Major changes in the composition of a Southern Ocean bacterial community in response to diatom-derived dissolved organic matter

2018 ◽  
Vol 94 (4) ◽  
Author(s):  
Marine Landa ◽  
Stéphane Blain ◽  
Jérôme Harmand ◽  
Sébastien Monchy ◽  
Alain Rapaport ◽  
...  
Keyword(s):  
Organic Matter ◽  
Bacterial Community ◽  
Dissolved Organic Matter ◽  
Southern Ocean

scholarly journals Linking shifts in bacterial community with changes in dissolved organic matter pool in a tropical lake

2019 ◽  
Vol 672 ◽  
pp. 990-1003 ◽  
Author(s):  
Marcelo P. Ávila ◽  
Luciana P.M. Brandão ◽  
Ludmila S. Brighenti ◽  
Denise Tonetta ◽  
Mariana P. Reis ◽  
...  
Keyword(s):  
Organic Matter ◽  
Bacterial Community ◽  
Dissolved Organic Matter ◽  
Tropical Lake ◽  
Organic Matter Pool

scholarly journals Viral lysis alters the optical properties and biological availability of dissolved organic matter derived from picocyanobacteria Prochlorococcus

2020 ◽  
Author(s):  
Xilin Xiao ◽  
Weidong Guo ◽  
Xiaolin Li ◽  
Chao Wang ◽  
Xiaowei Chen ◽  
...  
Keyword(s):  
Organic Matter ◽  
Optical Properties ◽  
Bacterial Community ◽  
Dissolved Organic Matter ◽  
Primary Production ◽  
Viral Infection ◽  
Biological Availability ◽  
Absorption Coefficients ◽  
Viral Lysis ◽  
Microbial Utilization

Phytoplankton contribute almost half of the world's total primary production. The exudates and viral lysates of phytoplankton are two important forms of dissolved organic matter (DOM) in aquatic environments and fuel heterotrophic prokaryotic metabolism. However, the effect of viral infection on the composition and biological availability of phytoplankton-released DOM is poorly understood. Here, we investigated the optical characteristics and microbial utilization of the exudates and viral lysates of the ecologically important unicellular picophytoplankton Prochlorococcus. Our results showed that Prochlorococcus DOM produced by viral lysis (Pro-vDOM) with phages of three different morphotypes (myovirus P-HM2, siphovirus P-HS2 and podovirus P-SSP7) had higher humic-like fluorescence intensities, lower absorption coefficients and higher spectral slopes compared to DOM exuded by Prochlorococcus (Pro-exudate). The results indicate that viral infection altered the composition of Prochlorococcus-derived DOM and might contribute to the pool of oceanic humic-like DOM. Incubation with Pro-vDOM resulted in a greater dissolved organic carbon (DOC) degradation rate and decreases in the absorption spectral slope and heterotrophic bacterial growth rate compared to incubation with Pro-exudate, suggesting that Pro-vDOM was more bioavailable compared to Pro-exudate. In addition, the stimulated microbial community succession trajectories were significantly different between the Pro-exudate and Pro-vDOM treatments, indicating that viral lysates play an important role in shaping the heterotrophic bacterial community. Our study demonstrated that viral lysis altered the chemical composition and biological availability of DOM derived from Prochlorococcus, which is the numerically dominant phytoplankton in the oligotrophic ocean. Importance The unicellular picocyanobacterium Prochlorococcus is the numerically dominate phytoplankton in the oligotrophic ocean, contributing to the vast majority of marine primary production. Prochlorococcus releases a significant fraction of fixed organic matter into surrounding environment and supports a vital portion of heterotrophic bacterial activity. Viral lysis is an important biomass loss process of Prochlorococcus. Yet little is known about whether and how viral lysis affects Prochlorococcus-released dissolved organic matter (DOM). Our paper shows that viral infection alters the optical properties (such as the absorption coefficients, spectral slopes and fluorescence intensities) of released DOM and might contribute to a humic-like DOM pool and carbon sequestration in the ocean. Meanwhile, viral lysis also releases various intracellular labile DOM including amino acids, protein-like DOM and lower-molecular weight DOM, increases the bioavailability of DOM and shapes the successive trajectory of the heterotrophic bacterial community. Our study highlights the importance of viruses in impacting the DOM quality in the ocean.

scholarly journals Experimental insights into the importance of aquatic bacterial community composition to the degradation of dissolved organic matter

2015 ◽  
Vol 10 (3) ◽  
pp. 533-545 ◽  
Author(s):  
Jürg B Logue ◽  
Colin A Stedmon ◽  
Anne M Kellerman ◽  
Nikoline J Nielsen ◽  
Anders F Andersson ◽  
...  
Keyword(s):  
Organic Matter ◽  
Bacterial Community ◽  
Dissolved Organic Matter ◽  
Community Composition ◽  
Bacterial Community Composition

scholarly journals Bacterial community structure and dissolved organic matter in repeatedly flooded subsurface karst water pools

2014 ◽  
Vol 89 (1) ◽  
pp. 111-126 ◽  
Author(s):  
Tanja Shabarova ◽  
Jörg Villiger ◽  
Oleg Morenkov ◽  
Jutta Niggemann ◽  
Thorsten Dittmar ◽  
...  
Keyword(s):  
Organic Matter ◽  
Community Structure ◽  
Bacterial Community ◽  
Dissolved Organic Matter ◽  
Bacterial Community Structure ◽  
Karst Water

scholarly journals Decomposition of dissolved organic matter released by an isolate of Microcystis aeruginosa and morphological profile of the associated bacterial community

2011 ◽  
Vol 71 (1) ◽  
pp. 57-63 ◽  
Author(s):  
IC. Moreira ◽  
I. Bianchini Jr. ◽  
AAH. Vieira
Keyword(s):  
Organic Matter ◽  
Organic Carbon ◽  
Bacterial Community ◽  
Dissolved Organic Matter ◽  
Microcystis Aeruginosa ◽  
Rate Constants ◽  
Bacterial Density ◽  
Bacterial Degradation ◽  
Order Kinetic ◽  
Order Kinetic Model

This study concerns the kinetics of bacterial degradation of two fractions (molecular mass) of dissolved organic matter (DOM) released by Microcystis aeruginosa. Barra Bonita Reservoir (SP, Brazil) conditions were simulated in the laboratory using the associated local bacterial community. The extent of degradation was quantified as the amount of organic carbon transferred from each DOM fraction (< 3 kDa and 3-30 kDa) to bacteria. The variation of bacteria morphotypes associated with the decomposition of each fraction was observed. To find the degradation rate constants (kT), the time profiles of the total, dissolved and particulate organic carbon concentrations were fitted to a first-order kinetic model. These rate constants were higher for the 3-30 kDa fraction than for the lighter fraction. Only in the latter fraction the formation of refractory dissolved organic carbon (DOC R) compounds could be detected and its rate of mass loss was low. The higher bacterial density was reached at 24 and 48 hours for small and higher fractions, respectively. In the first 48 hours of decomposition of both fractions, there was an early predominance of bacillus, succeeded by coccobacillus, vibrios and coccus, and from day 5 to 27, the bacterial density declined and there was greater evenness among the morphotypes. Both fractions of DOM were consumed rapidly, corroborating the hypothesis that DOM is readily available in the environment. This also suggests that the bacterial community in the inocula readily uses the labile part of the DOM, until this community is able to metabolise efficiently the remaining of DOM not degraded in the first moment. Given that M. aeruginosa blooms recur throughout the year in some eutrophic reservoirs, there is a constant supply of the same DOM which could maintain a consortium of bacterial morphotypes adapted to consuming this substrate.

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