scholarly journals The chemical cue tetrabromopyrrole from a biofilm bacterium induces settlement of multiple Caribbean corals

2014 ◽  
Vol 281 (1786) ◽  
pp. 20133086 ◽  
Author(s):  
Jennifer M. Sneed ◽  
Koty H. Sharp ◽  
Kimberly B. Ritchie ◽  
Valerie J. Paul
Keyword(s):  
Larval Settlement ◽  
Crustose Coralline Alga ◽  
Acropora Palmata ◽  
Chemical Cue ◽  
Broadcast Spawning ◽  
Porites Astreoides ◽  
Microbial Biofilms ◽  
Caribbean Coral ◽  
Single Compound

Microbial biofilms induce larval settlement for some invertebrates, including corals; however, the chemical cues involved have rarely been identified. Here, we demonstrate the role of microbial biofilms in inducing larval settlement with the Caribbean coral Porites astreoides and report the first instance of a chemical cue isolated from a marine biofilm bacterium that induces complete settlement (attachment and metamorphosis) of Caribbean coral larvae. Larvae settled in response to natural biofilms, and the response was eliminated when biofilms were treated with antibiotics. A similar settlement response was elicited by monospecific biofilms of a single bacterial strain, Pseudoalteromonas sp. PS5, isolated from the surface biofilm of a crustose coralline alga. The activity of Pseudoalteromonas sp. PS5 was attributed to the production of a single compound, tetrabromopyrrole (TBP), which has been shown previously to induce metamorphosis without attachment in Pacific acroporid corals. In addition to inducing settlement of brooded larvae ( P. astreoides ), TBP also induced larval settlement for two broadcast-spawning species, Orbicella (formerly Montastraea ) franksi and Acropora palmata , indicating that this compound may have widespread importance among Caribbean coral species.

scholarly journals BLANQUEAMIENTO CORALINO DE 1990 EN EL PARQUE NACIONAL NATURAL CORALES DEL ROSARIO (CARIBE, COLOMBIANO

2016 ◽  
Vol 22 ◽  
Author(s):  
Oscar David Solano ◽  
Gabriel Navas Suarez ◽  
Silvia K. Moreno Forero
Keyword(s):  
Coral Bleaching ◽  
Total Mortality ◽  
Recovery Process ◽  
Bleaching Event ◽  
Acropora Palmata ◽  
Acropora Cervicornis ◽  
Porites Astreoides ◽  
Montastrea Annularis ◽  
Role Of Light

At the beginning of June 1990 a coral-bleaching event was detected in the Islas del Rosario reefs, Colombian Caribbean. A preliminary survey of the Isla Grande northern barrier, and of the Caño Ratón and Isla Pavitos south reefs slopes resulted in a list of 19 affected species, which includes scleractinians, zoantideans and milleporins. Bleached colonies accounted for less than 10% of the total observed. The species most affected were Montastrea annularis and Porites astreoides. The recovery process was followed during a five month period in 20 Montastrea annularis, 3 Acropora palmata and 3 Acropora cervicornis colonies . The bleached patches (injuries) of each colony were meassured, demarked with steel nails and their evolution monitored at monthly intervals. Total mortality was observed in 52% of the injures, incomplete recovery in 40%, and no apparent change in the remaining 8% of the colonies. The coral- bleaching event was coincident with an unusual rise in water temperature (31°C to 32°C) between May and June 1990. As the high temperatures lasted until October of the same year (>30°C), these arÿpressumed to be the main cause of the bleaching phenomenon. The possible role of light as a concomitant factor is-also discussed.

scholarly journals Soundscapes influence the settlement of the common Caribbean coral Porites astreoides irrespective of light conditions

2018 ◽  
Vol 5 (12) ◽  
pp. 181358 ◽  
Author(s):  
Ashlee Lillis ◽  
Amy Apprill ◽  
Justin J. Suca ◽  
Cynthia Becker ◽  
Joel K. Llopiz ◽  
...  
Keyword(s):  
Larval Settlement ◽  
Low Frequency ◽  
Fish Abundance ◽  
Light Conditions ◽  
Coral Larvae ◽  
Acoustic Environment ◽  
Porites Astreoides ◽  
Caribbean Coral ◽  
The Common

The settlement of reef-building corals is critical to the survival and recovery of reefs. Recent evidence indicates that coral larvae orient towards reef sound, yet the components of the acoustic environment that may attract coral larvae and induce settlement are unknown. Here we investigated the effects of ambient soundscapes on settlement of Porites astreoides coral larvae using in situ chambers on reefs differing in habitat quality (coral and fish abundance). Mean larval settlement was twice as high in an acoustic environment with high levels of low-frequency sounds, typical of a high-quality, healthy reef; this result was observed in both natural light and dark treatments. Overall, the enhancement of coral settlement by soundscapes typical of healthy reefs suggests a positive feedback where soundscape properties of reefs with elevated coral and fish abundance may facilitate coral recruitment.

Microbial Biofilms and Biotechnology – Some Perceptions

2020 ◽  
Vol 09 ◽  
Author(s):  
Subba Rao Toleti
Keyword(s):  
Tissue Culture ◽  
Synthetic Biology ◽  
Industrial Effluents ◽  
Aquatic Environments ◽  
Biochemical Processes ◽  
Microbial Biofilms ◽  
Biofilm Bacteria ◽  
Prophylactic Vaccines ◽  
Design Construction

: The review is an attempt to introduce the readers in brief about biofilms and their implications as well as some new perceptions in biotechnology. Biofilms are adherent microbial communities, which are developed on submerged surfaces in aquatic environments. Biofilms play a significant role in exopolymer production, material deterioration and also cause harmful infections. Further, the role of corrosion causing biofilm bacteria in deterioration of different materials, microbial biofilms and their enzymatic processes in reducing the toxicity of pollutants in industrial effluents are elaborated, along with clean technologies for wastewater treatment. Biotechnology is defined as any technological application that uses biological systems to synthesize or modify products or processes. The applications include biochemical processes, medical care, cell and tissue culture as well as synthetic biology and others. Synthetic biology details about the design, construction of new biological components and systems for useful purposes. Finally, to overcome the limitations that are inherent to the use of cellular host’s, cell-free systems as critical platforms for synthetic biology applications. This mini-review also mentions about new diagnostic products based on enzymes, monoclonal antibodies and engineered proteins as well as novel prophylactic vaccines.

scholarly journals Acclimatization to high-variance habitats does not enhance physiological tolerance of two key Caribbean corals to future temperature and pH

2016 ◽  
Vol 283 (1831) ◽  
pp. 20160442 ◽  
Author(s):  
Emma F. Camp ◽  
David J. Smith ◽  
Chris Evenhuis ◽  
Ian Enochs ◽  
Derek Manzello ◽  
...  
Keyword(s):  
Climate Change ◽  
Future Climate ◽  
Seagrass Beds ◽  
Metabolic Rates ◽  
Acropora Palmata ◽  
Climate Scenarios ◽  
Environmental Variance ◽  
Outer Reef ◽  
Porites Astreoides ◽  
Physiological Tolerance

Corals are acclimatized to populate dynamic habitats that neighbour coral reefs. Habitats such as seagrass beds exhibit broad diel changes in temperature and pH that routinely expose corals to conditions predicted for reefs over the next 50–100 years. However, whether such acclimatization effectively enhances physiological tolerance to, and hence provides refuge against, future climate scenarios remains unknown. Also, whether corals living in low-variance habitats can tolerate present-day high-variance conditions remains untested. We experimentally examined how pH and temperature predicted for the year 2100 affects the growth and physiology of two dominant Caribbean corals ( Acropora palmata and Porites astreoides ) native to habitats with intrinsically low (outer-reef terrace, LV) and/or high (neighbouring seagrass, HV) environmental variance. Under present-day temperature and pH, growth and metabolic rates (calcification, respiration and photosynthesis) were unchanged for HV versus LV populations. Superimposing future climate scenarios onto the HV and LV conditions did not result in any enhanced tolerance to colonies native to HV. Calcification rates were always lower for elevated temperature and/or reduced pH. Together, these results suggest that seagrass habitats may not serve as refugia against climate change if the magnitude of future temperature and pH changes is equivalent to neighbouring reef habitats.

scholarly journals The role of skeletal micro-architecture in diagenesis and dating of Acropora palmata

2016 ◽  
Vol 183 ◽  
pp. 153-175 ◽  
Author(s):  
P.J. Tomiak ◽  
M.B. Andersen ◽  
E.J. Hendy ◽  
E.K. Potter ◽  
K.G. Johnson ◽  
...  
Keyword(s):  
Acropora Palmata
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