Salinity and Temperature Effects on Physiological Responses of Vibrio fischeri from Diverse Ecological Niches

Soto, William; Gutiérrez, José Manuel Gómez; Remmenga, Marta D.; Nishiguchi, Michele K.

doi:10.1007/s00248-008-9412-9

Cited by 63 publications

(105 citation statements)

References 49 publications

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“…Bacterial growth is fundamentally controlled by temperature and can be accurately modelled [67]. The fact Vibrionaceae predominates in most samples could be related to the relatively fast-growing, psychrotolerant [59,68] and bile tolerant [69] nature of these species. Since many Vibrionaceae share similar ecophysiological traits it is likely specific species can get supplanted by other species.…”

Section: Discussionmentioning

confidence: 99%

Atlantic Salmon (Salmo salar L.) Gastrointestinal Microbial Community Dynamics in Relation to Digesta Properties and Diet

et al. 2016

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To better understand salmon GI tract microbial community dynamics in relation to diet, a feeding trial was performed utilising diets with different proportions of fish meal, protein, lipid and energy levels. Salmon gut dysfunction has been associated with the occurrence of casts, or an empty hind gut. A categorical scoring system describing expressed digesta consistency was evaluated in relation to GI tract community structure. Faster growing fish generally had lower faecal scores while the diet cohorts showed minor differences in faecal score though the overall lowest scores were observed with a low protein, low energy diet.The GI tract bacterial communities were highly dynamic over time with the low protein, low energy diet associated with the most divergent community structure. This included transiently increased abundance of anaerobic (Bacteroidia and Clostridia) during January and February and facultatively anaerobic (lactic acid bacteria) taxa from February onwards. The digesta had enriched populations of these groups in relation to faecal cast samples. The majority of samples (60-86%) across all diet cohorts were eventually dominated by the genus Aliivibrio.The results suggest that an interaction between time of sampling and diet is most strongly related to community structure. Digesta categorization revealed microbes involved with metabolism of diet components change progressively over time and could be a useful system to assess feeding responses.

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Section: Discussionmentioning

confidence: 99%

Atlantic Salmon (Salmo salar L.) Gastrointestinal Microbial Community Dynamics in Relation to Digesta Properties and Diet

et al. 2016

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“…The Vibrio genus is an excellent model system because it is found in a notable range of environmental temperatures and salinities (Urakawa and Rivera, 2006), which have been shown to be the strongest environmental determinants of microbial community composition (Lozupone and Knight, 2007;Herlemann et al, 2011). Moreover, there is evidence that temperature and salinity are prominent factors in Vibrio ecology, population dynamics, physiological stress response and evolution (Kaspar and Tamplin, 1993;McCarthy, 1996;Randa et al, 2004;Garrity et al, 2005;Soto et al, 2009). …”

Section: Introductionmentioning

confidence: 99%

Shape and evolution of the fundamental niche in marine Vibrio

et al. 2012

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Hutchinson’s fundamental niche, defined by the physical and biological environments in which an organism can thrive in the absence of inter-species interactions, is an important theoretical concept in ecology. However, little is known about the overlap between the fundamental niche and the set of conditions species inhabit in nature, and about natural variation in fundamental niche shape and its change as species adapt to their environment. Here, we develop a custom-made dual gradient apparatus to map a cross-section of the fundamental niche for several marine bacterial species within the genus Vibrio based on their temperature and salinity tolerance, and compare tolerance limits to the environment where these species commonly occur. We interpret these niche shapes in light of a conceptual model comprising five basic niche shapes. We find that the fundamental niche encompasses a much wider set of conditions than those strains typically inhabit, especially for salinity. Moreover, though the conditions that strains typically inhabit agree well with the strains’ temperature tolerance, they are negatively correlated with the strains’ salinity tolerance. Such relationships can arise when the physiological response to different stressors is coupled, and we present evidence for such a coupling between temperature and salinity tolerance. Finally, comparison with well-documented ecological range in V. vulnificus suggests that biotic interactions limit the occurrence of this species at low-temperature—high-salinity conditions. Our findings highlight the complex interplay between the ecological, physiological and evolutionary determinants of niche morphology, and caution against making inferences based on a single ecological factor.

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“…V. fischeri (and other marine bacteria) in its planktonic state are found over broad geographical ranges, and their biofilms are subjected to multiple physiological stresses that lead to alterations in bacterial physiology (promoting bacterial fitness and bacterial speciation) (10). Thus, the survival of planktonic cells and biofilms in the environment is not only defined by the capacity to overcome abiotic pressures but also by the ability to serve as a protective niche against natural protozoan consumers (11,12).…”

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confidence: 99%

Predation Response of Vibrio fischeri Biofilms to Bacterivorus Protists

Chavez-Dozal

Gorman

Erken

et al. 2013

Appl Environ Microbiol

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Vibrio fischeri proliferates in a sessile, stable community known as a biofilm, which is one alternative survival strategy of its life cycle. Although this survival strategy provides adequate protection from abiotic factors, marine biofilms are still susceptible to grazing by bacteria-consuming protozoa. Subsequently, grazing pressure can be controlled by certain defense mechanisms that confer higher biofilm antipredator fitness. In the present work, we hypothesized that V. fischeri exhibits an antipredator fitness behavior while forming biofilms. Different predators representing commonly found species in aquatic populations were examined, including the flagellates Rhynchomonas nasuta and Neobodo designis (early biofilm feeders) and the ciliate Tetrahymena pyriformis (late biofilm grazer). V. fischeri biofilms included isolates from both seawater and squid hosts (Euprymna and Sepiola species). Our results demonstrate inhibition of predation by biofilms, specifically, isolates from seawater. Additionally, antiprotozoan behavior was observed to be higher in late biofilms, particularly toward the ciliate T. pyriformis; however, inhibitory effects were found to be widespread among all isolates tested. These results provide an alternative explanation for the adaptive advantage and persistence of V. fischeri biofilms and provide an important contribution to the understanding of defensive mechanisms that exist in the out-of-host environment.

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Salinity and Temperature Effects on Physiological Responses of Vibrio fischeri from Diverse Ecological Niches

Cited by 63 publications

References 49 publications

Atlantic Salmon (Salmo salar L.) Gastrointestinal Microbial Community Dynamics in Relation to Digesta Properties and Diet

Atlantic Salmon (Salmo salar L.) Gastrointestinal Microbial Community Dynamics in Relation to Digesta Properties and Diet

Shape and evolution of the fundamental niche in marine Vibrio

Predation Response of Vibrio fischeri Biofilms to Bacterivorus Protists

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