Global survey of diversity among environmental saltwater <i>Bacteriovoracaceae</i>

Piñeiro, Silvia A.; Stine, O. Colin; Chauhan, Ashvini; Steyert, Susan R.; Smith, Richard; Williams, Henry N.

doi:10.1111/j.1462-2920.2007.01362.x

Cited by 56 publications

(105 citation statements)

References 40 publications

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“…Using full-length 16S analysis, the phylogenetic relatedness of these isolates to other BALOs was inferred ( Figure 1e). Our Halobacteriovorax isolates were all identical at the 16S rRNA sequence level (accession #KR493097), and grouped within the previously established Halobacteriovorax cluster XIII (Figure 1e; Pineiro et al, 2007).…”

Section: Resultsmentioning

confidence: 99%

“…In contrast to viruses, which are the most abundant biological entity in the marine environment and maintain abundances approximately in an order of magnitude greater than their hosts, BALOs do not need to be in high initial concentrations in the environment to drive significant bacterial mortality of their prey (Richards et al, 2012;Williams et al, 2016). One group of Bdellovibrionales, the marine Halobacteriovorax, are broadly distributed in marine waters across temperature, salinity and pH gradients (Pineiro et al, 2007). Halobacteriovorax predation represents a regulatory mechanism that can alter the structure of bacterial communities (Li et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

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Bacterial predation in a marine host-associated microbiome

et al. 2015

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In many ecological communities, predation has a key role in regulating community structure or function. Although predation has been extensively explored in animals and microbial eukaryotes, predation by bacteria is less well understood. Here we show that predatory bacteria of the genus Halobacteriovorax are prevalent and active predators on the surface of several genera of reef-building corals. Across a library of 198 16S rRNA samples spanning three coral genera, 79% were positive for carriage of Halobacteriovorax. Cultured Halobacteriovorax from Porites asteroides corals tested positive for predation on the putative coral pathogens Vibrio corallyticus and Vibrio harveyii. Co-occurrence network analysis showed that Halobacteriovorax's interactions with other bacteria are influenced by temperature and inorganic nutrient concentration, and further suggested that this bacterial predator's abundance may be driven by prey availability. Thus, animal microbiomes can harbor active bacterial predators, which may regulate microbiome structure and protect the host by consuming potential pathogens.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Bacterial predation in a marine host-associated microbiome

et al. 2015

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“…One approach, comparative analysis of 16S rRNA sequences, has enabled identification and detection of specific Bacteriovorax phylogenetic clusters or operational taxonomic units (OTUs) within populations (Pineiro et al, 2004). This has made possible geographical distribution studies that have found that some OTUs occur widely and in diverse environments; whereas, others are restricted to certain ecosystems (Pineiro et al, 2007). Such findings have advanced knowledge of Bacteriovorax, and raised new questions about environmental parameters that account for the varied distribution patterns of different OTUs.…”

Section: Introductionmentioning

confidence: 98%

“…Such findings have advanced knowledge of Bacteriovorax, and raised new questions about environmental parameters that account for the varied distribution patterns of different OTUs. Salinity and temperature are among such parameters (Williams and Falkler, 1984;Pineiro et al, 2007) and there is speculation on a role for the prey (Sutton and Besant, 1994;Pineiro et al, 2004). In this scenario, different prey species select for distinct populations of Bacteriovorax OTUs, and thereby influence the presence, distribution and services of the predators in nature.…”

Section: Introductionmentioning

confidence: 99%

Prey bacteria shape the community structure of their predators

Chen

Athar²,

Zheng

et al. 2011

The ISME Journal

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Although predator-prey interactions among higher organisms have been studied extensively, only few examples are known for microbes other than protists and viruses. Among the bacteria, the most studied obligate predators are the Bdellovibrio and like organisms (BALOs) that prey on many other bacteria. In the macroscopical world, both predator and prey influence the population size of the other's community, and may have a role in selection. However, selective pressures among prey and predatory bacteria have been rarely investigated. In this study, Bacteriovorax, a predator within the group of BALOs, in environmental waters were fed two prey bacteria, Vibrio vulnificus and Vibrio parahaemolyticus. The two prey species yielded distinct Bacteriovorax populations, evidence that selective pressures shaped the predator community and diversity. The results of laboratory experiments confirmed the differential predation of Bacteriovorax phylotypes on the two bacteria species. Not only did Bacteriovorax Cluster IX exhibit the versatility to be the exclusive efficient predator on Vibrio vulnificus, thereby, behaving as a specialist, but was also able to prey with similar efficiency on Vibrio parahaemolyticus, indicative of a generalist. Therefore, we proposed a designation of versatilist for this predator. This initiative should provide a basis for further efforts to characterize the predatory patterns of bacterial predators. The results of this study have revealed impacts of the prey on Bacteriovorax predation and in structuring the predator community, and advanced understanding of predation behavior in the microbial world.

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“…Although relatively low in abundance, typically 0-50 plaque-forming units (PFU) per ml (Taylor et al, 1974;Varon and Shilo, 1980;Richards et al, 2013), compared with viruses, BALOs are ubiquitous globally. They have been isolated from oceans, seas, estuaries, salt lakes, ponds, freshwater systems and soils (Taylor et al, 1974;Williams, 1979;Sutton and Besant, 1994;Pineiro et al, 2004;Davidov et al, 2006;Pineiro et al, 2007). Furthermore, many bacteria, up to 80% of cultivable organisms in estuarine systems, have been reported to be susceptible to predation by BALOs (Rice et al, 1998).…”

Section: Introductionmentioning

confidence: 99%

Halobacteriovorax, an underestimated predator on bacteria: potential impact relative to viruses on bacterial mortality

et al. 2015

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Predation on bacteria and accompanying mortality are important mechanisms in controlling bacterial populations and recycling of nutrients through the microbial loop. The agents most investigated and seen as responsible for bacterial mortality are viruses and protists. However, a body of evidence suggests that predatory bacteria such as the Halobacteriovorax (formerly Bacteriovorax), a Bdellovibrio-like organism, contribute substantially to bacterial death. Until now, conclusive evidence has been lacking. The goal of this study was to better understand the contributors to bacterial mortality by addressing the poorly understood role of Halobacteriovorax and how their role compares with that of viruses. The results revealed that when a concentrated suspension of Vibrio parahaemolyticus was added into microcosms of estuarine waters, the native Halobacteriovorax were the predators that responded first and most rapidly. Their numbers increased by four orders of magnitude, whereas V. parahaemolyticus prey numbers decreased by three orders of magnitude. In contrast, the extant virus population showed little increase and produced little change in the prey density. An independent experiment with stable isotope probing confirmed that Halobacteriovorax were the predators primarily responsible for the mortality of the V. parahaemolyticus. The results show that Halobacteriovorax have the potential to be significant contributors to bacterial mortality, and in such cases, predation by Halobacteriovorax may be an important mechanism of nutrient recycling. These conclusions add another dimension to bacterial mortality and the recycling of nutrients.

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Global survey of diversity among environmental saltwater Bacteriovoracaceae

Cited by 56 publications

References 40 publications

Bacterial predation in a marine host-associated microbiome

Bacterial predation in a marine host-associated microbiome

Prey bacteria shape the community structure of their predators

Halobacteriovorax, an underestimated predator on bacteria: potential impact relative to viruses on bacterial mortality

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