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https://www.readbyqxmd.com/read/28642738/distinct-bacterial-communities-associated-with-massive-and-branching-scleractinian-corals-and-potential-linkages-to-coral-susceptibility-to-thermal-or-cold-stress
#1
Jiayuan Liang, Kefu Yu, Yinghui Wang, Xueyong Huang, Wen Huang, Zhenjun Qin, Ziliang Pan, Qiucui Yao, Wenhuan Wang, Zhengchao Wu
It is well known that different coral species have different tolerances to thermal or cold stress, which is presumed to be related to the density of Symbiodinium. However, the intrinsic factors between stress-tolerant characteristics and coral-associated bacteria are rarely studied. In this study, 16 massive coral and 9 branching coral colonies from 6 families, 10 genera, and 18 species were collected at the same time and location (Xinyi Reef) in the South China Sea to investigate the bacterial communities...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28631353/microbiome-dynamics-in-early-life-stages-of-the-scleractinian-coral-acropora-gemmifera-in-response-to-elevated-pco2
#2
Guowei Zhou, Lin Cai, Tao Yuan, Renmao Tian, Haoya Tong, Weipeng Zhang, Lei Jiang, Minglan Guo, Sheng Liu, Pei-Yuan Qian, Hui Huang
Reef-building coral is a complex holobiont, harbouring diverse microorganisms that play essential roles in maintaining coral health. However, microbiome development in early life stages of coral remains poorly understood. Here, microbiomes of Acropora gemmifera were analysed during spawning and early developmental stages, and also under different seawater partial pressure of CO2 (pCO2 ) conditions, using amplicon sequencing of 16S rRNA gene for bacteria and archaea and of ITS2 for Symbiodinium. No remarkable microbiome shift was observed in adults before and after spawning...
June 19, 2017: Environmental Microbiology
https://www.readbyqxmd.com/read/28607345/coral-lipid-bodies-as-the-relay-center-interconnecting-diel-dependent-lipidomic-changes-in-different-cellular-compartments
#3
Hung-Kai Chen, Li-Hsueh Wang, Wan-Nan U Chen, Anderson B Mayfield, Oren Levy, Chan-Shing Lin, Chii-Shiarng Chen
Lipid bodies (LBs) in the coral gastrodermal tissues are key organelles in the regulation of endosymbiosis and exhibit a diel rhythmicity. Using the scleractinian Euphyllia glabrescens collected across the diel cycle, we observed temporally dynamic lipid profiles in three cellular compartments: host coral gastrodermal cells, LBs, and in hospite Symbiodinium. Particularly, the lipidome varied over time, demonstrating the temporally variable nature of the coral-Symbiodinium endosymbiosis. The lipidome-scale data highlight the dynamic, light-driven metabolism of such associations and reveal that LBs are not only lipid storage organelles but also act as a relay center in metabolic trafficking...
June 12, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28584301/high-resolution-profiling-of-coral-associated-bacterial-communities-using-full-length-16s-rrna-sequence-data-from-pacbio-smrt-sequencing-system
#4
Wirulda Pootakham, Wuttichai Mhuantong, Thippawan Yoocha, Lalita Putchim, Chutima Sonthirod, Chaiwat Naktang, Nalinee Thongtham, Sithichoke Tangphatsornruang
Coral reefs are a complex ecosystem consisting of coral animals and a vast array of associated symbionts including the dinoflagellate Symbiodinium, fungi, viruses and bacteria. Several studies have highlighted the importance of coral-associated bacteria and their fundamental roles in fitness and survival of the host animal. The scleractinian coral Porites lutea is one of the dominant reef-builders in the Indo-West Pacific. Currently, very little is known about the composition and structure of bacterial communities across P...
June 5, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28579915/microbiome-variation-in-corals-with-distinct-depth-distribution-ranges-across-a-shallow-mesophotic-gradient-15-85%C3%A2-m
#5
Bettina Glasl, Pim Bongaerts, Nathalie H Elisabeth, Ove Hoegh-Guldberg, Gerhard J Herndl, Pedro R Frade
Mesophotic coral ecosystems (MCEs) are generally poorly studied, and our knowledge of lower MCEs (below 60 m depth) is largely limited to visual surveys. Here, we provide a first detailed assessment of the prokaryotic community associated with scleractinian corals over a depth gradient to the lower mesophotic realm (15-85 m). Specimens of three Caribbean coral species exhibiting differences in their depth distribution ranges (Agaricia grahamae, Madracis pharensis and Stephanocoenia intersepta) were collected with a manned submersible on the island of Curaçao, and their prokaryotic communities assessed using 16S rRNA gene sequencing analysis...
2017: Coral Reefs: Journal of the International Society for Reef Studies
https://www.readbyqxmd.com/read/28573035/expression-of-a-symbiosis-specific-gene-in-symbiodinium-type-a1-associated-with-coral-nudibranch-and-giant-clam-larvae
#6
M Mies, C R Voolstra, C B Castro, D O Pires, E N Calderon, P Y G Sumida
Symbiodinium are responsible for the majority of primary production in coral reefs and found in a mutualistic symbiosis with multiple animal phyla. However, little is known about the molecular signals involved in the establishment of this symbiosis and whether it initiates during host larval development. To address this question, we monitored the expression of a putative symbiosis-specific gene (H(+)-ATPase) in Symbiodinium A1 ex hospite and in association with larvae of a scleractinian coral (Mussismilia hispida), a nudibranch (Berghia stephanieae) and a giant clam (Tridacna crocea)...
May 2017: Royal Society Open Science
https://www.readbyqxmd.com/read/28573008/common-reef-building-coral-in-the-northern-red-sea-resistant-to-elevated-temperature-and-acidification
#7
Thomas Krueger, Noa Horwitz, Julia Bodin, Maria-Evangelia Giovani, Stéphane Escrig, Anders Meibom, Maoz Fine
Coral reefs are currently experiencing substantial ecological impoverishment as a result of anthropogenic stressors, and the majority of reefs are facing immediate risk. Increasing ocean surface temperatures induce frequent coral mass bleaching events-the breakdown of the nutritional photo-symbiosis with intracellular algae (genus: Symbiodinium). Here, we report that Stylophora pistillata from a highly diverse reef in the Gulf of Aqaba showed no signs of bleaching despite spending 1.5 months at 1-2°C above their long-term summer maximum (amounting to 11 degree heating weeks) and a seawater pH of 7...
May 2017: Royal Society Open Science
https://www.readbyqxmd.com/read/28546553/symbiont-community-stability-through-severe-coral-bleaching-in-a-thermally-extreme-lagoon
#8
E G Smith, G O Vaughan, R N Ketchum, D McParland, J A Burt
Coral reefs are threatened by climate change as coral-algal symbioses are currently living close to their upper thermal limits. The resilience of the algal partner plays a key role in determining the thermal tolerance of the coral holobiont and therefore, understanding the acclimatory limits of present day coral-algal symbioses is fundamental to forecasting corals' responses to climate change. This study characterised the symbiont community in a highly variable and thermally extreme (Max = 37.5 °C, Min = 16...
May 25, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28544363/expression-patterns-of-sterol-transporters-npc1-and-npc2-in-the-cnidarian-dinoflagellate-symbiosis
#9
Vincent Dani, Fabrice Priouzeau, Marjolijn Mertz, Magali Mondin, Sophie Pagnotta, Sandra Lacas-Gervais, Simon K Davy, Cécile Sabourault
The symbiotic interaction between cnidarians (e.g. corals and sea anemones) and photosynthetic dinoflagellates of the genus Symbiodinium is triggered by both host-symbiont recognition processes and metabolic exchange between the two partners. The molecular communication is crucial for homeostatic regulation of the symbiosis, both under normal conditions and during stresses that further lead to symbiosis collapse. It is therefore important to identify and fully characterize the key players of this intimate interaction at the symbiotic interface...
May 22, 2017: Cellular Microbiology
https://www.readbyqxmd.com/read/28542245/identifying-corals-displaying-aberrant-behavior-in-fiji-s-lau-archipelago
#10
Anderson B Mayfield, Chii-Shiarng Chen, Alexandra C Dempsey
Given the numerous threats against Earth's coral reefs, there is an urgent need to develop means of assessing reef coral health on a proactive timescale. Molecular biomarkers may prove useful in this endeavor because their expression should theoretically undergo changes prior to visible signs of health decline, such as the breakdown of the coral-dinoflagellate (genus Symbiodinium) endosymbiosis. Herein 13 molecular- and physiological-scale biomarkers spanning both eukaryotic compartments of the anthozoan-Symbiodinium mutualism were assessed across 70 pocilloporid coral colonies sampled from reefs of Fiji's easternmost province, Lau...
2017: PloS One
https://www.readbyqxmd.com/read/28533949/worldwide-exploration-of-the-microbiome-harbored-by-the-cnidarian-model-exaiptasia-pallida-agassiz-in-verrill-1864-indicates-a-lack-of-bacterial-association-specificity-at-a-lower-taxonomic-rank
#11
Tanya Brown, Christopher Otero, Alejandro Grajales, Estefania Rodriguez, Mauricio Rodriguez-Lanetty
Examination of host-microbe interactions in early diverging metazoans, such as cnidarians, is of great interest from an evolutionary perspective to understand how host-microbial consortia have evolved. To address this problem, we analyzed whether the bacterial community associated with the cosmopolitan and model sea anemone Exaiptasia pallida shows specific patterns across worldwide populations ranging from the Caribbean Sea, and the Atlantic and Pacific oceans. By comparing sequences of the V1-V3 hypervariable regions of the bacterial 16S rRNA gene, we revealed that anemones host a complex and diverse microbial community...
2017: PeerJ
https://www.readbyqxmd.com/read/28526200/nickel-and-ocean-warming-affect-scleractinian-coral-growth
#12
T Biscéré, A Lorrain, R Rodolfo-Metalpa, A Gilbert, A Wright, C Devissi, C Peignon, R Farman, E Duvieilbourg, C Payri, F Houlbrèque
The sensitivity of corals and their Symbiodinium to warming has been extensively documented; however very few studies considered that anthropogenic inputs such as metal pollution have already an impact on many fringing reefs. Thus, today, nickel releases are common in coastal ecosystems. In this study, two major reef-building species Acropora muricata and Pocillopora damicornis were exposed in situ to ambient and moderate nickel concentrations on a short-term period (1h) using benthic chamber experiments. Simultaneously, we tested in laboratory conditions the combined effects of a chronic exposure (8weeks) to moderate nickel concentrations and ocean warming on A...
May 17, 2017: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/28510705/crystal-structure-of-octocoral-lectin-sll-2-complexed-with-forssman-antigen-tetrasaccharide
#13
Akiko Kita, Mitsuru Jimbo, Ryuichi Sakai, Yukio Morimoto, Ryota Takeuchi, Hiroshi Tanaka, Takashi Takahashi, Kunio Miki
A symbiosis-related lectin, SLL-2, from the octocoral Sinularia lochmodes, distributes densely on the cell surface of microalgae, Symbiodinium sp., an endosymbiotic dinoflagellate of the coral, and is also shown to be a chemical cue that transforms dinoflagellates into a non-motile (coccoid) symbiotic state. SLL-2 binds to the sugar chain of the molecule similar to Forssman antigen pentasaccharide (GalNAcα1-3GalNAcβ1-3 Galα1-4 Galβ1-4Glc) on the surface of microalgae with high affinity. Here we report the crystal structure of the complex between SLL-2 and Forssman antigen tetrasaccharide (GalNAcα1-3GalNAcβ1-3 Galα1-4 Galβ) at 3...
May 16, 2017: Glycobiology
https://www.readbyqxmd.com/read/28501690/toxicity-estimates-for-diuron-and-atrazine-for-the-tropical-marine-cnidarian-exaiptasia-pallida-and-in-hospite-symbiodinium-spp-using-pam-chlorophyll-a-fluorometry
#14
Pelli Louise Howe, Amanda Jean Reichelt-Brushett, Malcolm William Clark, Cliff Ross Seery
Effective ecotoxicological risk assessments for herbicides in tropical marine environments are restricted by a lack of toxicity data, sensitive test methods and endpoints for relevant species, and this requires rectification. The symbiotic sea anemone Exaiptasia pallida is a suitable test species, representing the phylum Cnidaria and allowing for assessments of toxicological responses of both the animal host and in-hospite Symbiodinium spp. Pulse amplitude modulated (PAM) chlorophyll-a fluorometry is recognised as a valuable ecotoxicological tool, and here newly-developed test methods are presented using PAM fluorometry to measure herbicide effects on photosynthetic efficiency of in-hospite Symbiodinium spp...
June 2017: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/28481198/a-diverse-host-thrombospondin-type-1-repeat-protein-repertoire-promotes-symbiont-colonization-during-establishment-of-cnidarian-dinoflagellate-symbiosis
#15
Emilie-Fleur Neubauer, Angela Z Poole, Philipp Neubauer, Olivier Detournay, Kenneth Tan, Simon K Davy, Virginia M Weis
The mutualistic endosymbiosis between cnidarians and dinoflagellates is mediated by complex inter-partner signaling events, where the host cnidarian innate immune system plays a crucial role in recognition and regulation of symbionts. To date, little is known about the diversity of thrombospondin-type-1 repeat (TSR) domain proteins in basal metazoans or their potential role in regulation of cnidarian-dinoflagellate mutualisms. We reveal a large and diverse repertoire of TSR proteins in seven anthozoan species, and show that in the model sea anemone Aiptasia pallida the TSR domain promotes colonization of the host by the symbiotic dinoflagellate Symbiodinium minutum...
May 8, 2017: ELife
https://www.readbyqxmd.com/read/28464532/correspondence-of-coral-holobiont-metabolome-with-symbiotic-bacteria-archaea-and-symbiodinium-communities
#16
Emilia M Sogin, Hollie M Putnam, Craig E Nelson, Paul Anderson, Ruth D Gates
Microbial symbiotic partners, such as those associated with Scleractinian corals, mediate biochemical transformations that influence host performance and survival. While evidence suggests microbial community composition partly accounts for differences in coral physiology, how these symbionts affect metabolic pathways remains underexplored. We aimed to assess functional implications of variation among coral-associated microbial partners in hospite. To this end, we characterized and compared metabolomic profiles and microbial community composition from nine reef-building coral species...
May 2, 2017: Environmental Microbiology Reports
https://www.readbyqxmd.com/read/28464391/exploratory-analysis-of-symbiodinium-transcriptomes-reveals-potential-latent-infection-by-large-dsdna-viruses
#17
Scott A Lawrence, Sheri A Floge, Joanne E Davy, Simon K Davy, William H Wilson
Coral reefs are in decline worldwide. Much of this decline is attributable to mass coral bleaching events and disease outbreaks, both of which are linked to anthropogenic climate change. Despite increased research effort, much remains unknown about these phenomena, especially the causative agents of many coral diseases. In particular, coral-associated viruses have received little attention, and their potential roles in coral diseases are largely unknown. Previous microscopy studies have produced evidence of viral infections in Symbiodinium, the endosymbiotic algae critical for coral survival, and more recently molecular evidence of Symbiodinium-infecting viruses has emerged from metagenomic studies of corals...
May 2, 2017: Environmental Microbiology
https://www.readbyqxmd.com/read/28447372/rapid-thermal-adaptation-in-photosymbionts-of-reef-building-corals
#18
Leela J Chakravarti, Victor H Beltran, Madeleine J H van Oppen
Climate warming is occurring at a rate not experienced by life on Earth for 10 s of millions of years, and it is unknown whether the coral-dinoflagellate (Symbiodinium spp.) symbiosis can evolve fast enough to ensure coral reef persistence. Coral thermal tolerance is partly dependent on the Symbiodinium hosted. Therefore, directed laboratory evolution in Symbiodinium has been proposed as a strategy to enhance coral holobiont thermal tolerance. Using a reciprocal transplant design, we show that the upper temperature tolerance and temperature tolerance range of Symbiodinium C1 increased after ~80 asexual generations (2...
April 27, 2017: Global Change Biology
https://www.readbyqxmd.com/read/28407448/draft-genomes-of-the-corallimorpharians-amplexidiscus-fenestrafer-and-discosoma-sp
#19
Xin Wang, Yi Jin Liew, Yong Li, Didier Zoccola, Sylvie Tambutte, Manuel Aranda
Corallimorpharia are the closest non-calcifying relatives of reef-building corals. Aside from their popularity among aquarium hobbyists, their evolutionary position between the Actiniaria (sea anemones) and the Scleractinia (hard corals) makes them ideal candidates for comparative studies aiming at understanding the evolution of hexacorallian orders in general and reef-building corals in particular. Here we have sequenced and assembled two draft genomes for the Corallimorpharia species Amplexidiscus fenestrafer and Discosoma sp...
April 13, 2017: Molecular Ecology Resources
https://www.readbyqxmd.com/read/28390081/symbiodinium-mitigate-the-combined-effects-of-hypoxia-and-acidification-on-a-non-calcifying-cnidarian
#20
Shannon G Klein, Kylie A Pitt, Matthew R Nitschke, Samantha Goyen, David T Welsh, David J Suggett, Anthony R Carroll
Anthropogenic nutrient inputs enhance microbial respiration within many coastal ecosystems, driving concurrent hypoxia and acidification. During photosynthesis, Symbiodinium spp., the microalgal endosymbionts of cnidarians and other marine phyla, produce O2 and assimilate CO2 , and thus potentially mitigate the exposure of the host to these stresses. However, such a role for Symbiodinium remains untested for non-calcifying cnidarians. We therefore contrasted the fitness of symbiotic and aposymbiotic polyps of a model host jellyfish (Cassiopea sp...
April 8, 2017: Global Change Biology
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