Uptake of dissolved free amino acids by four cold-water coral species from the Mediterranean Sea

Gori, Andrea; Grover, Renaud; Orejas, Covadonga; Sikorski, S.; Ferrier‐Pagés, Christine

doi:10.1016/j.dsr2.2013.06.007

Cited by 50 publications

(32 citation statements)

References 80 publications

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“…Deep-sea corals are dependent on heterotrophic feeding and therefore generally limited not only in nitrogen, but also in carbon supply (Kiriakoulakis et al, 2004;Roberts et al, 2006). To cover their demands, corals utilize a wide range of food sources including phytodetritus, phytoplankton, zooplankton, dissolved organic matter (Dodds et al, 2007;Gori et al, 2014), and even chemoautotrophic carbon-fixing has been suggested (Middelburg et al, 2015). In line with this, the bacterial microbiome of in situ E. fistula included bacterial taxa with the potential to fix nitrogen and carbon directly (i.e., "dinitrogen-fixing, " "carbon fixation") or indirectly, e.g., from crustacean prey (i.e., "chitin degradation").…”

Section: Putative Functional Differences Between Native Red Sea and Lmentioning

confidence: 99%

Distinct Bacterial Microbiomes Associate with the Deep-Sea Coral Eguchipsammia fistula from the Red Sea and from Aquaria Settings

et al. 2017

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Microbial communities associated with deep-sea corals are beginning to be studied in earnest and the contribution of the microbiome to host organismal function remains to be investigated. In this regard, the ability of the microbiome to adjust to prevailing environmental conditions might provide clues to its functional importance. In this study, we characterized bacterial community composition associated with the deep-sea coral Eguchipsammia fistula under natural (in situ) and aquaria (ex situ) settings using 16S rRNA gene amplicon sequencing. We compared freshly collected Red Sea coral specimens with those reared for >1 year at conditions that partially differed from the natural environment, in particular regarding increased oxygen and food availability under ex situ conditions. We found substantial differences between the microbiomes associated with corals under both environmental settings. The core microbiome comprised only six bacterial taxa consistently present in all corals, whereas the majority of bacteria were exclusively associated either with freshly collected corals or corals under long-term reared aquaria settings. Putative functional profiling of microbial communities showed that corals in their natural habitat were enriched for processes indicative of a carbonand nitrogen-limited environment, which might be reflective of differences in diet under in situ and ex situ conditions. The ability of E. fistula to harbor distinct microbiomes under different environmental settings might contribute to the flexibility and phenotypic plasticity of this cosmopolitan coral. Future efforts should further assess the role of these different bacteria in holobiont function, in particular since E. fistula is naturally present in markedly different environments.

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Section: Putative Functional Differences Between Native Red Sea and Lmentioning

confidence: 99%

Distinct Bacterial Microbiomes Associate with the Deep-Sea Coral Eguchipsammia fistula from the Red Sea and from Aquaria Settings

et al. 2017

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“…Combining observational data and multivariate statistical analyses has provided a wealth of information on ranges of individual environmental parameters tolerated by CWC (e.g., Davies et al, 2008;Davies and Guinotte, 2011). In addition, laboratory experiments provided some insight into maximum and/or minimum tolerated levels of some environmental parameters (e.g., Tsounis et al, 2010;Gori et al, 2014;Movilla et al, 2014;Naumann et al, 2014;Maier et al, 2016;Büscher et al, 2017), however, with partly contrasting results from different studies and areas (e.g., Dodds et al, 2007;Lunden et al, 2014) probably hinting to regional adaptations.…”

Section: Discussionmentioning

confidence: 99%

“…However, recent discoveries of hitherto unknown CWC reefs that exist today under rather "extreme" conditions [e.g., in terms of temperature or oxygen (Ramos et al, 2017)], force us to shift the upper and lower thresholds of environmental parameters beyond formerly described values. In addition, laboratory experiments conducted on several common CWC species (e.g., Lophelia pertusa, Madrepora oculata, and Dendrophyllia) provided additional information on their ecological requirements (e.g., in terms of temperature, carbonate system, food supply, and oxygen) (e.g., Tsounis et al, 2010;Gori et al, 2014;Movilla et al, 2014;Naumann et al, 2014;Maier et al, 2016;Büscher et al, 2017) and also indicate region-specific adaptations of CWC to particular environmental parameters (Dodds et al, 2007;Lunden et al, 2014). Furthermore, exceeding/undercutting such environmental thresholds ("tipping point") causing a local extinction of CWC so far has never been documented by field observations.…”

Section: Introductionmentioning

confidence: 99%

The Fate of Cold-Water Corals in a Changing World: A Geological Perspective

et al. 2019

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As "ecosystem engineers," framework-forming scleractinian cold-water corals (CWC) build reefs that are unique biodiversity hotspots in the deep sea. Studies using common biological techniques such as correlating the spatial occurrence of the most common CWC species with modeled environmental conditions have revealed the ecological requirements and tolerances of these species. However, limited field observations and poorly understood geographical distribution patterns of the CWC restrict the application of existing knowledge toward assessing their fate (e.g., local extinction, newly established populations) under ongoing global change. Hence, the risk to cross ecological tipping points causing the demise (or establishment) of entire CWC reefs remains unclear. A major challenge is to identify the key environmental parameters (or stressors) having the potential to control CWC vitality by providing such tipping points. This is largely hampered by the overall lack of present-day observations of such tipping point crossings. However, evidence for such events is frequently preserved in geological records revealing that entire CWC ecosystems vanished or returned at specific moments in the past. Here, a geological approach is presented that by correlating geological CWC records with paleoceanographic data describing past environmental changes allows to identify a set of key environmental drivers that directly or indirectly control CWC vitality. Thus, by combining such a geological approach with common biological techniques (see above) to describe the ecological tolerance of the most important reefbuilding CWC has a great potential to better assess their future spatial distribution in times of accelerating global change and to improve the sustainable management of the important deep-sea ecosystems formed by CWC.

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“…Whereas DOM needs to be transported to potential consumers (e.g. sponges and coldwater corals; de Goeij et al 2013, Gori et al 2014, Mueller et al 2014 by water movement, which may be advective or turbulent, POM can arrive at the seafloor through gravitational sinking. However, passive organic particle sinking is generally considered insufficient to meet the high metabolic demands of reef communities in the North-Atlantic (Soetaert et al 2016).…”

Section: Introductionmentioning

confidence: 99%

Cabled ocean observatory data reveal food supply mechanisms to a cold-water coral reef

Engeland

Godø

Duineveld

et al. 2019

Progress in Oceanography

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We investigated food supply mechanisms to a cold-water coral (CWC) reef at 260 m depth on the Norwegian continental shelf using data from a cabled ocean observatory equipped with Acoustic Doppler Current Profilers (ADCPs), an echosounder, and sensors for chlorophyll, turbidity and hydrography in the benthic boundary layer (BBL). Tidal currents of up to tens of cm s-1 dominated BBL hydrodynamics while residual currents were weak (~10 cm s-1), emphasizing a supply and high retention of locally produced phytodetritus within the trough. A direct connection between the reefs and surface organic matter (OM) was established by turbulent mixing and passive particle settling, but relative contributions varied seasonally. Fresh OM from a spring-bloom was quickly mixed into the BBL, but temperature stratification in summer reduced the surface-to-bottom connectivity and reduced the phytodetritus supply. A qualitative comparison among acoustic backscatter in the ADCPs (600 kHz, 190 kHz) and echosounder (70 kHz) suggests that vertically migrating zooplankton may present an alternative food source in summer. Nocturnal feeding by zooplankton in the upper water column sustains downward OM transport independent from water column mixing and may dominate as food supply pathway over sedimentation of the phytodetritus, especially during stratified conditions. In addition, it could present a concentrating mechanism for nutritional components as compensation for the deteriorating phytodetritus quality. Overall, the observed patterns suggest seasonal changes in the food supply pathways to the reef communities. The moderating role of temperature stratification in phytodetritus transport suggests stronger dependence of the cold-water corals on zooplankton for their dietary requirements with increased stratification under future climate scenarios. This study demonstrates the added value of permanent ocean observatories to research based on dedicated campaigns and regular monitoring.

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Uptake of dissolved free amino acids by four cold-water coral species from the Mediterranean Sea

Cited by 50 publications

References 80 publications

Distinct Bacterial Microbiomes Associate with the Deep-Sea Coral Eguchipsammia fistula from the Red Sea and from Aquaria Settings

Distinct Bacterial Microbiomes Associate with the Deep-Sea Coral Eguchipsammia fistula from the Red Sea and from Aquaria Settings

The Fate of Cold-Water Corals in a Changing World: A Geological Perspective

Cabled ocean observatory data reveal food supply mechanisms to a cold-water coral reef

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