Microbial composition of biofilms associated with lithifying rubble of<i>Acropora palmata</i>branches

Beltrán, Yislem; Cerqueda-García, Daniel; Taş, Neslihan; Thomé, Patricia E.; Iglesias-Prieto, Roberto; Falcón, Luisa I.

doi:10.1093/femsec/fiv162

Cited by 11 publications

(20 citation statements)

References 66 publications

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“…The reef framework is continuously infilled with sediment, rubble and cements, as part of diagenetic alteration [ 42 , 65 , 66 ]. These cements are largely composed of high‐magnesium calcite and aragonite that can infill the voids between the rubble pieces and encrust over the dead skeletal materials [ 61 , 67 ]. Calcifying microbialites further trap and bind sediments and are important in providing a rigid cementation ( S2 Appendix ).…”

Section: The Structure and Consolidation Of Reef Substratamentioning

confidence: 99%

Substrate stabilisation and small structures in coral restoration: State of knowledge, and considerations for management and implementation

et al. 2020

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Coral reef ecosystems are under increasing pressure from local and regional stressors and a changing climate. Current management focuses on reducing stressors to allow for natural recovery, but in many areas where coral reefs are damaged, natural recovery can be restricted, delayed or interrupted because of unstable, unconsolidated coral fragments, or rubble. Rubble fields are a natural component of coral reefs, but repeated or high-magnitude disturbances can prevent natural cementation and consolidation processes, so that coral recruits fail to survive. A suite of interventions have been used to target this issue globally, such as using mesh to stabilise rubble, removing the rubble to reveal hard substrate and deploying rocks or other hard substrates over the rubble to facilitate recruit survival. Small, modular structures can be used at multiple scales, with or without attached coral fragments, to create structural complexity and settlement surfaces. However, these can introduce foreign materials to the reef, and a limited understanding of natural recovery processes exists for the potential of this type of active intervention to successfully restore local coral reef structure. This review synthesises available knowledge about the ecological role of coral rubble, natural coral recolonisation and recovery rates and the potential benefits and risks associated with active interventions in this rapidly evolving field. Fundamental knowledge gaps include baseline levels of rubble, the structural complexity of reef habitats in space and time, natural rubble consolidation processes and the risks associated with each intervention method. Any restoration intervention needs to be underpinned by risk assessment, and the decision to repair rubble fields must arise from an understanding of when and where unconsolidated substrate and lack of structure impair natural reef recovery and ecological function. Monitoring is necessary to ascertain the success or failure of the intervention and impacts of potential risks, but there is a strong need to specify desired outcomes, the spatial and temporal context and indicators to be measured. With a focus on the Great Barrier Reef, we synthesise the techniques, successes and failures associated with rubble stabilisation and the use of small structures, review monitoring methods and indicators, and provide recommendations to ensure that we learn from past projects.

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Section: The Structure and Consolidation Of Reef Substratamentioning

confidence: 99%

Substrate stabilisation and small structures in coral restoration: State of knowledge, and considerations for management and implementation

et al. 2020

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“…Az oxigéntermelő és anoxigenikus (oxigént nem termelő) fototróf szervezetek CO 2 -megkötése nem jár alkalinitásnövekedéssel, de a folyamat során nő a pH, ami karbonátkiválást eredményez (PENTECOST & RIDING 1986, MERZ 1992. Azt is kimutatták, hogy a biofilm egyes részein is kialakulhat olyan alkalinitás-gradiens, amely elmeszesedést eredményez (PENTECOST 1985, BELTRÁN et al 2016. Bizonyos környezeti feltételek mellett azonban, pl.…”

Section: öSszefoglalásunclassified

“…Jelentős mértékben járulnak hozzá a zátonyszerkezet stabilitásának kialakításához (PERRY & HEPBURN 2008, BELTRÁN et al 2016. A nagy Mg-tartalmú kalcitból álló mikrobakérgeket a szakirodalom korábban többféle változat ban is említi, úgy mint mikritcement, mikrobás karbonátok, sztromatoli tok és mikrobialitok (JONES & HUNTER 1991, RIDING 1991b, MONTAGGIONI & CAMOIN 1993, CAMOIN et al 1999, RIDING & TOMÁS 2006, RIDING 2011, SEARD et al 2011, RIDING et al 2014, BELTRÁN et al 2016. Az indopacifikus és karibi térség negyedidőszaki zátonyrendszereiben is megfigyeltek mik ro ba kérge ket, amelyek általában a korallok elhalása után képződtek a zátonyok fejlődéstörténetének utolsó fázisában.…”

Section: Aktuálgeológiai Kutatások Korallzátonyokonunclassified

“…A korallzátonyokon mélyített fúrások tanúsága szerint mind szerkezetileg, mind térfoga tu kat tekintve a zátonyok igen jelentős alkotóelemét képvi sel hetik. A fúrómagokban az arányuk a kőzet 80%-át is elérheti (MONTAGGIONI & CAMOIN 1993, CAMOIN et al 1999, SEARD et al 2011, BELTRÁN et al 2016. Gyakran mészvázú vörösalgákkal együtt alkotnak stabil aljzatot, amely a további zátonyépítő szervezetek megtelepedését biztosítja (RI -DING 1991b, BELTRÁN et al 2016.…”

Section: Aktuálgeológiai Kutatások Korallzátonyokonunclassified

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Mikrobialitok jellegzetességei: a biofilmek szerepe a karbonátkiválásban

2020

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Microbialite is a type of organosedimentary desposits where the presence of organic matrix of a microbial biofilm plays predominant role in petrogenesis. This study reviews previous researches on microbial-induced carbonate deposits, microbe-mineral interaction in carbonate precipitation, and sedimentary and petrographic features of these deposits. It also presents modern deposits and some case studies from Hungary. The activity of the bacterial biofilm communities has a significant effect on their environment and can initiate crystal nucleation and growth. The mineral precipitation can be both biologically induced and influenced wise, in contrast with biologically-controlled biomineralisation that is common in organisms with internal or external calcareous skeletons. The mineralization in the biofilms is related to the increasing alkalinity and the released Ca 2+ ions, which elevates the carbonate saturation level of the pore water, or to increasing pH level. Previous studies showed that mineral precipitation takes places in several stages. Firstly, there is an increase in local alkalinity in the extracellular polymetric substance (EPS) that favors the formation of amorphous CaCO 3 gel. Secondly, nanospheres appear in the matrix that provide substrates for mineral nucleation. Carbonate minerals that form in the realm of diagenesis have a specific petrographic features. Clotted micrite as well as the presence of calcimicrobes and fenestral pores are the microscopic components that define the microbialite. In addition to the microscopic fabric, microbialites also have various macroscopic fabric and structures that place them into four categories: laminated stromatolite, blothcy thrombolite, bush-like dendrolite, and structureless leiolite. Biofilm originated crusts can form in cavities of reef frameworks that also belong to the term of microbialite. Microbialites can compose microbial reefs or layered, stratiform sheets that are defined by the shape of the deposits and facies connections.

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“…This process begins to create a new reef structure that increases in extension according to the deterioration of healthy Acropora palmata corals. Beltrán et al [17] suggested that microbial calcification in Acropora rubble can be induced in biofilms composed of extracellular polymeric substances (e.g. polysaccharides, proteins, lipids, nucleic acids) and a variety of microorganisms attached to coral rubble, becoming an important cementing agent.…”

Section: Introductionmentioning

confidence: 99%

Metagenome of Acropora palmata coral rubble: Potential metabolic pathways and diversity in the reef ecosystem

Sánchez-Quinto

Falcón

2019

PLoS ONE

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Over the past 30 years, the stony coral Acropora palmata has experienced an excessive loss of individuals showing few signs of recovery throughout the Mexican Caribbean, resulting in long stretches of coral rubble structures. When the coral dies, the skeleton begins to be colonized by algae, sponges, virus, bacteria and other microorganisms, forming a new community. Here we analyze, using a metagenomic approach, the diversity and biogeochemical cycles associated to coral rubble in La Bocana (Puerto Morelos, QRoo, Mexico). This study provides the first broad characterization of coral rubble associated communities and their role in biogeochemical cycling, suggesting a potential view of a world where coral reefs are no longer dominated by corals.

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Microbial composition of biofilms associated with lithifying rubble ofAcropora palmatabranches

Cited by 11 publications

References 66 publications

Substrate stabilisation and small structures in coral restoration: State of knowledge, and considerations for management and implementation

Substrate stabilisation and small structures in coral restoration: State of knowledge, and considerations for management and implementation

Mikrobialitok jellegzetességei: a biofilmek szerepe a karbonátkiválásban

Metagenome of Acropora palmata coral rubble: Potential metabolic pathways and diversity in the reef ecosystem

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