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Kavazos CRJ, Ricci F, Leggat W, Casey JM, Choat JH, Ainsworth TD. Intestinal Microbiome Richness of Coral Reef Damselfishes ( Actinopterygii: Pomacentridae). Integr Org Biol 2022; 4:obac026. [PMID: 36136736 PMCID: PMC9486986 DOI: 10.1093/iob/obac026] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2021] [Revised: 06/13/2022] [Indexed: 12/03/2022] Open
Abstract
Fish gastro-intestinal system harbors diverse microbiomes that affect the host's
digestion, nutrition, and immunity. Despite the great taxonomic diversity of fish, little
is understood about fish microbiome and the factors that determine its structure and
composition. Damselfish are important coral reef species that play pivotal roles in
determining algae and coral population structures of reefs. Broadly, damselfish belong to
either of two trophic guilds based on whether they are planktivorous or algae-farming. In
this study, we used 16S rRNA gene sequencing to investigate the intestinal microbiome of 5
planktivorous and 5 algae-farming damselfish species (Pomacentridae) from
the Great Barrier Reef. We detected Gammaproteobacteria ASVs belonging to
the genus Actinobacillus in 80% of sampled individuals across the 2
trophic guilds, thus, bacteria in this genus can be considered possible core members of
pomacentrid microbiomes. Algae-farming damselfish had greater bacterial alpha-diversity, a
more diverse core microbiome and shared 35 ± 22 ASVs, whereas planktivorous species shared
7 ± 3 ASVs. Our data also highlight differences in microbiomes associated with both
trophic guilds. For instance, algae-farming damselfish were enriched in
Pasteurellaceae, whilst planktivorous damselfish in
Vibrionaceae. Finally, we show shifts in bacterial community
composition along the intestines. ASVs associated with the classes Bacteroidia,
Clostridia, and Mollicutes bacteria were predominant in the
anterior intestinal regions while Gammaproteobacteria abundance was
higher in the stomach. Our results suggest that the richness of the intestinal bacterial
communities of damselfish reflects host species diet and trophic guild.
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Affiliation(s)
- Christopher R J Kavazos
- Biological, Earth and Environmental Sciences, The University of New South Wales , Kensington, NSW 2052 , Australia
| | - Francesco Ricci
- Biological, Earth and Environmental Sciences, The University of New South Wales , Kensington, NSW 2052 , Australia
- Centre of Marine Bio-Innovation, The University of New South Wales , Kensington, NSW 2052 , Australia
| | - William Leggat
- School of Environmental and Life Sciences, The University of Newcastle , 10 Chittaway Dr, Ourimbah, NSW 2258 , Australia
| | - Jordan M Casey
- Australian Research Council Centre of Excellence for Coral Reef Studies, James Cook University , Townsville, QLD 4811 , Australia
- PSL Université Paris: EPHE-UPVD-CNRS, USR 3278 CRIOBE, Université de Perpignan , Perpignan 66100 , France
- Laboratoire d'Excellence “CORAIL,” Université de Perpignan , Perpignan 66100 , France
| | - J Howard Choat
- College of Science and Engineering, James Cook University , Townsville QLD 4814 , Australia
| | - Tracy D Ainsworth
- Biological, Earth and Environmental Sciences, The University of New South Wales , Kensington, NSW 2052 , Australia
- Centre of Marine Bio-Innovation, The University of New South Wales , Kensington, NSW 2052 , Australia
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Huang L, Guo L, Xu X, Qin Y, Zhao L, Su Y, Yan Q. The role of rpoS in the regulation of Vibrio alginolyticus virulence and the response to diverse stresses. JOURNAL OF FISH DISEASES 2019; 42:703-712. [PMID: 30811044 DOI: 10.1111/jfd.12972] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/07/2018] [Revised: 01/16/2019] [Accepted: 01/17/2019] [Indexed: 06/09/2023]
Abstract
Vibrio alginolyticus is a leading aquatic pathogen, causing huge losses to aquaculture. rpoS has been proven to play a variety of important roles in stress response and virulence in several bacteria. In our previous study, upon treatment with Cu2+ , Pb2+ , Hg2+ and low pH, the expression levels of rpoS were downregulated as assessed by RNA-seq, while impaired adhesion ability was observed, indicating that rpoS might play roles in the regulation of adhesion. In the present study, the RNAi technology was used to knockdown rpoS in V. alginolyticus. In comparison with wild-type V. alginolyticus, RNAi-treated bacteria showed significantly impaired abilities of adhesion, growth, haemolytic, biofilm production, movement and virulence. Meanwhile, alterations of temperature, salinity, pH and starvation starkly affected rpoS expression. The present data suggested that rpoS is a critical regulator of virulence in V. alginolyticus; in addition, rpoS regulates bacterial adhesion in response to temperature, pH and nutrient content changes. These are helpful to explore its pathogenic mechanism and provide reference for disease control.
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Affiliation(s)
- Lixing Huang
- Key Laboratory of Healthy Mariculture for the East China Sea, Fisheries College, Ministry of Agriculture, Jimei University, Xiamen, China
| | - Lina Guo
- Key Laboratory of Healthy Mariculture for the East China Sea, Fisheries College, Ministry of Agriculture, Jimei University, Xiamen, China
| | - Xiaojin Xu
- Key Laboratory of Healthy Mariculture for the East China Sea, Fisheries College, Ministry of Agriculture, Jimei University, Xiamen, China
| | - Yingxue Qin
- Key Laboratory of Healthy Mariculture for the East China Sea, Fisheries College, Ministry of Agriculture, Jimei University, Xiamen, China
| | - Lingmin Zhao
- Key Laboratory of Healthy Mariculture for the East China Sea, Fisheries College, Ministry of Agriculture, Jimei University, Xiamen, China
| | - Yongquan Su
- State Key Laboratory of Large Yellow Croaker Breeding, Ningde, China
| | - Qingpi Yan
- Key Laboratory of Healthy Mariculture for the East China Sea, Fisheries College, Ministry of Agriculture, Jimei University, Xiamen, China
- State Key Laboratory of Large Yellow Croaker Breeding, Ningde, China
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