Characterization of the Bacterial Community of the Chemically Defended Hawaiian Sacoglossan Elysia rufescens

Davis, Jeanette; Fricke, W. Florian; Hamann, Mark T.; Esquenazi, Eduardo; Dorrestein, Pieter C.; Hill, Russell T.

doi:10.1128/aem.01568-13

Cited by 35 publications

(34 citation statements)

References 72 publications

(65 reference statements)

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“…Symbiotic microbes typically supply nutrients to host animals that provide the microbes with shelter. Light production Squid Euprymna scolopes [109] Chemical defense Sacoglossan Elysia rufescens [110] Mollusks inhabit a variety of marine ecosystems. In environments characterized by poor nutrient contents, alternative strategies for nutrition have evolved.…”

Section: Contribution Of Symbionts To the Fatty Acid Pool Of Mollusksmentioning

confidence: 99%

Fatty Acids of Marine Mollusks: Impact of Diet, Bacterial Symbiosis and Biosynthetic Potential

Zhukova

2019

Biomolecules

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The n-3 and n-6 polyunsaturated fatty acid (PUFA) families are essential for important physiological processes. Their major source are marine ecosystems. The fatty acids (FAs) from phytoplankton, which are the primary producer of organic matter and PUFAs, are transferred into consumers via food webs. Mollusk FAs have attracted the attention of researchers that has been driven by their critical roles in aquatic ecology and their importance as sources of essential PUFAs. The main objective of this review is to focus on the most important factors and causes determining the biodiversity of the mollusk FAs, with an emphasis on the key relationship of these FAs with the food spectrum and trophic preference. The marker FAs of trophic sources are also of particular interest. The discovery of new symbioses involving invertebrates and bacteria, which are responsible for nutrition of the host, deserves special attention. The present paper also highlights recent research into the molecular and biochemical mechanisms of PUFA biosynthesis in marine mollusks. The biosynthetic capacities of marine mollusks require a well-grounded evaluation.Biomolecules 2019, 9, 857 2 of 25 consumers and food consumed, and, therefore, FA can be used as efficient and useful biomarkers for the study of trophic interactions between organisms in aquatic ecosystems [5,6].However, information about the endogenous mechanisms of marine invertebrates responsible for synthesis of n-3 and n-6 PUFAs is still being accumulated. Recent researches have shown the potential of some marine mollusks for endogenous synthesis of long chain PUFAs (LC-PUFAs) [7][8][9]. Based on the transcriptome and genome sequences, as well as various publicly available databases, a number of novel fatty acyl desaturases (Fad) and elongations of very long-chain fatty acid (Elovl) genes have been identified from the major orders of the phylum Mollusca, suggesting that many mollusks possess most of the required enzymes for the synthesis of long chain LC-PUFAs [10]. The question whether these findings of the desaturase sequences in invertebrate species really cast doubt on the idea that the organic matter is transferred along the food chains, and thus the existence of trophic links between primary producers and consumers and the relationship of the FA composition of animals and the FA composition of food, are currently under discussion [8].Mollusk FA have attracted the attention of researchers that has been driven by their critical roles in aquatic ecology and in trophic food webs, as well as by their importance as sources of essential FAs with important impacts on human health [11]. Among marine animals, mollusks are especially important as a source of PUFAs (after fish). Many members of the phylum Mollusca, commonly known as clams and snails, are traditional seafood items in human diets, and rich in essential PUFAs. The edible mollusks are commercially harvested and cultured [12]. Marine bivalve mollusks are highly appreciated, partly because of their positive effects on human health ...

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Section: Contribution Of Symbionts To the Fatty Acid Pool Of Mollusksmentioning

confidence: 99%

Fatty Acids of Marine Mollusks: Impact of Diet, Bacterial Symbiosis and Biosynthetic Potential

Zhukova

2019

Biomolecules

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“…Overall, the data available for marine molluscs are not sufficient to evaluate the relative roles of geographic location and host identity in structuring the microbiome of a host. While studies focusing on microbiomes of multiple species at a particular site show that host identity plays a major role in determining microbiome composition (Davis et al, 2013;Aronson et al, 2017;Cicala et al, 2018), analyses of bivalves in aquaculture settings have shown that rearing the same host in different locations tends to change the relative abundances of a number of microbial phyla between individuals, which suggests that the external environment can also have a substantial effect on the composition of molluscan microbiomes (Trabal et al, 2012;Trabal Fernández et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Diversity and composition of intertidal gastropod microbiomes across a major marine biogeographic boundary

Neu

Allen

Roy

2019

Environ Microbiol Rep

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Summary Marine biogeographic boundaries act as barriers to dispersal for many animal species, thereby creating distinctive faunas on either side. However, how such boundaries affect the distributions of microbial taxa remains poorly known. To test whether biogeographic boundaries influence the diversity and composition of host‐associated microbiota, we analysed the microbiomes of three species of common intertidal gastropods at two sites separated by the biogeographic boundary at Point Conception (PtC), CA, using 16S rRNA gene sequencing. Our results show that each host species shows microbiome compositional specificity, even across PtC, and that alpha diversity does not change significantly across this boundary for any of the gastropod hosts. However, for two of the host species, beta diversity differs significantly across PtC, indicating that there may be multiple levels of organization of the marine gastropod microbiome. Overall, our results suggest that while biogeographic boundaries do not constrain the distribution of a core set of microbes associated with each host species, they can play a role in structuring the transient portion of the microbiome.

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“…Members of the genus Vibrio are commonly found as part of the normal flora of molluscan intestinal tract (Oxley et al 2002;Davis et al 2013), thus making broodstock one of the principal sources of contamination in marine bivalve hatcheries. Several studies have been carried out on the gonads of reared mollusks revealed that they may be strongly infested with Vibrio (Lodeiros et al 1987;Llanos et al 2002;Sainz-Hernández et al 2005) which leads to the hypothesis of their vertical transmission between reproducers and gametes.…”

Section: Discussionmentioning

confidence: 99%

Impacts of rearing techniques on growth, survival and bacterial microbiota of carpet shell clam (Ruditapes decussatus) larvae

et al. 2016

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In this study, we investigate the impacts of two water treatment regimes, the closed aquaculture system (CAS) and flow-through system (FTS), on the carpet shell clam (Ruditapes decussatus) larval microbiota, growth and survival. A bacteriological barrier (B) was created among breeder stage treated by florfenicol (FF, 8 mg L -1 day -1 per 5 days). After spawning, larvae were maintained in five different rearing techniques: CAS; FTS; B ? CAS; B ? FTS and B ? CAS ? FF (8 mg L -1 day -1 per 3 days). Significant decrease was observed in both total bacterial count and presumptive Vibrio count (PVC) in FF-treated breeders. Besides, larvae reared in B ? FTS showed significantly lower PVC than larvae maintained in other rearing techniques. It was also determined that growth and survival of larvae reared in B ? CAS ? FF and B ? FTS were significantly better than those reared in other systems. One hundred and twelve Vibrio strains, isolated from breeders, eggs and larvae, were subjected to some bacteriological tests (API 20E strips, vibriostatic agent O/129, growth at different temperatures and salinity). Vibrio alginolyticus was the predominant isolated species (36.61 %), followed by V. fluvialis (25 %), V. vunificus (17.86 %), V. cholera (13.39 %) and V. paraheamolyticus (7.14 %). These results may contribute to the understanding of the effect of rearing techniques on the bacterial load, survival and growth of early life stages of R. decussatus larvae.

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Characterization of the Bacterial Community of the Chemically Defended Hawaiian Sacoglossan Elysia rufescens

Cited by 35 publications

References 72 publications

Fatty Acids of Marine Mollusks: Impact of Diet, Bacterial Symbiosis and Biosynthetic Potential

Fatty Acids of Marine Mollusks: Impact of Diet, Bacterial Symbiosis and Biosynthetic Potential

Diversity and composition of intertidal gastropod microbiomes across a major marine biogeographic boundary

Impacts of rearing techniques on growth, survival and bacterial microbiota of carpet shell clam (Ruditapes decussatus) larvae

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