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Coral Reefs - DOAJ

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Last Updated: 18 January 2023

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Change and stasis of distinct sediment microbiomes across Port Everglades Inlet (PEI) and the adjacent coral reefs

Deep water ports are human-built coastal buildings that, by definition, welcome ship traffic and chaos. Port Everglades Inlet is a large commercial cargo port in South Florida that serves over two million residents and is located close to coral reefs, dwindling mangroves, and recreational beaches. The microbial communities of PEI and adjacent reef sediments were found in this report to be used to measure change due to dredging and assessment of anthropogenic presence on these fragile ecosystems by sequencing the V4 region of 16S rRNA ahead of a large-scale port deepening event. PEI sediments and adjacent coral reef sediments were collected for two years in a row, including 2020 and 2021. This review demonstrated the use and relative simplicity of using molecular ecology technologies to address macroscale problems with environmental management ramifications.

Source link: https://doi.org/10.7717/peerj.14288


δ13C and δ15N stable isotopes demonstrate seasonal changes in the food web of coral reefs at the Wuzhizhou Island of the South China sea

Coral reef food webs on WZZ in Sanya were found to determine how climate change and human activities affected coral reef ecosystems. We investigated the main organic matter pathways and causes of seasonal variation in coral reef fauna and isotope values using carbon and nitrogen stable isotopes and the Bayesian mixture models to determine ecosystem function. On WZZ, seasonal environmental conditions did not have no influence on the coral reef food web's nutrient web's stability.

Source link: https://doi.org/10.1016/j.ecolind.2022.109852


Oceanic productivity and high-frequency temperature variability—not human habitation—supports calcifier abundance on central Pacific coral reefs

Coral reefs have been negatively affected by climate change's global shifts in ocean conditions that have been shown to be more widespread. We then asked whether oceanic function, past sea surface temperatures, or intense heat stress supersede the effects of human habitation on benthic coverage. In more arid and CCA-rich waters with greater biomass of herbivores, increased coral and CCA coverage was noted in more aquatic waters, with increased SST variability and reduced herbivore biomass. Coral coverage was positively correlated with daily SST change, but not positively correlated with monthly variations, as shown by monthly variation. Surprisingly, acute heat stress measurements were not correlated with benthic skin, not benthic cover. Human habitation is no longer a primary predictor of calcifier coverage on central Pacific island reefs, according to our findings, we find that human habitation is no longer a primary predictor of reef builder abundance, as well as the addition of oceanic quality and high-frequency SST variability.

Source link: https://doi.org/10.3389/fmars.2022.1075972


Assessment of Tropical Cyclone Risk to Coral Reefs: Case Study for Australia

By focusing on coral reefs, we hope to extend tropical cyclone risk assessment methodology and increase understanding of TC danger to Australia's natural environment in this study. TC risk assessment reports have commonly focused on the effects of TC risk assessment reports on human lives and infrastructure exposed to TC events. The report has found the potential benefits of such a TC risk assessment framework that can be extended on as coral data collection becomes more widely available.

Source link: https://doi.org/10.3390/rs14236150


New Botrylloides , Botryllus , and Symplegma (Ascidiacea: Styelidae) in Coral Reefs of the Southern Gulf of Mexico and Mexican Caribbean Sea

In all marine environments, styelid ascidians are distributed and have a high morphological plasticity and complexity. Barcoded samples of 110 samples from seven reefs in 24 locations using mitochondrial cytochrome c oxidase subunit I as well as a detailed morphological analysis, respectively. Botrylloides n. . . . and Botryllus humilis were two of the botryllid species identified as Botrylloides n. . . . and Botryllus humilis, the latter being the first record for the Gulf of Mu00e9xico. The remaining ten botryllid species and the two Symplegma species are not well known in literature and have no close matches in GenBank, according to the GenBank. B. bonanzus sp. Here we list twelve new species, seven in Botryllus. B. alacranensis sp. , three in Botrylloides, three in Botrylloides. nov. , B. ampullarius sp. , sp. , nov. , sp. Two in Symplegma are nov. , and two in Symplegma are sp. of S. papillata sp. nov. , nov. , and S. sisalensis sp.

Source link: https://doi.org/10.3390/d14110977


Co-occurring anthropogenic stressors reduce the timeframe of environmental viability for the world's coral reefs.

Ecosystem thresholds are here defined as limits in a given stressor beyond which ecosystems have undergone significant shifts in community assembly and operation, resulting in remains of what they once were, but not necessarily leading to species destruction or destruction. Given the geographical proximity in which many disturbances affect the world's coral reefs, we find that the timelines of environmental suitability have been halved, as opposed to investigating individually. The median year after which social conditions became unsuitable for the world's remaining coral reefs was, at worst, 2050 for any one single storm alone; however, when analyzed concurrently, this date was reduced to 2035. When analyzed together, disturbances reduced the date of environmental suitability because areas that might be suitable under one condition may become unsuitable by any of several other variables. However, up to 64% of the world's coral reefs could face unsuitable environmental conditions by one storm or another, despite the best-case scenario, which was characterized by strong mitigation of greenhouse gas emissions and optimistic human growth, ended in 41% of global coral reefs with unsuitable conditions by 2100 under any one disturbance alone. Prior studies have predicted the negative effects of climate change on coral reefs by mid-century, by analyzing a slew of expected disruptions; our study shows a more aggressive outlook for the world's coral reefs as they have less time to adapt, highlighting the urgent need to find viable solutions to human disturbances.

Source link: https://doi.org/10.1371/journal.pbio.3001821


Changing the climate risk trajectory for coral reefs

Coral reefs are extremely vulnerable to climate change, and their recent degradation will persist unless we can incite strong global climate action with effective regional interventions. I demonstrate that ensemble modeling can be used to produce rigorous risk assessments that can be used to analyze intervention tactics. All of the key elements that are required for risk assessment can be generated by the model in a dynamically consistent fashion, which is a major benefit of this approach. This is a major advancement in semi-quantitative climate change vulnerability risk assessments, which estimate these numbers accurately and then combine them under new assumptions. Regional intervention efforts, such as solar radiation monitoring and monitoring coral predators, could reduce risk and possibly avoid severe risks predicted for the second half of the century, according to a combined risk analysis.

Source link: https://doi.org/10.3389/fclim.2022.980035


Biophysical and physiological processes causing oxygen loss from coral reefs

Reef deoxygenation will be caused by the microbialization of coral reefs, according to microbialization. Folly algae, according to metagenomic results and in vitro incubations of bacteria with primary producer exudates, stimulate incomplete carbon oxidation metabolism in heterotrophic bacteria. The loss of oxygen caused by heterogenous nucleation on algae surfaces was shown by Experiments probing the dissolved and gaseous oxygen with primary producers and bacteria together, indicating the loss of oxygen through ebullition triggered by heterogenous nucleation.

Source link: https://doi.org/10.7554/eLife.49114


Contrasting hydrodynamic regimes of submerged pinnacle and emergent coral reefs.

Coral reefs' hydrodynamics differ with depth, reef morphology, and seascape position. As a result of interactions between currents and the abrupt physical structure, submerged coral reefs on steep-sided, conical bathymetric features like seamounts have increased water flow as a result of improved water circulation. In offshore locations, smaller pinnacles and regional water currents may have similar interactions, while shallow reefs may be more vulnerable to surface currents fueled by wind, waves, and tide. In both nearshore and offshore locations, we investigated whether coral pinnacles had stronger and more variable currents than emergent reefs at the same depth. We saw seasonal shifts in current speeds for pinnacle and nearshore reefs, but there was no difference in current strength on offshore reefs. In addition, we discovered a consistent mismatch between satellite sea surface temperatures and in-situ temperature measurements, which was on average 2 u00b0C cooler during the annual study period.

Source link: https://doi.org/10.1371/journal.pone.0273092


Cumulative Human Impacts on Coral Reefs: Assessing Risk and Management Implications for Brazilian Coral Reefs

Coral reef restoration strategies must be tailored to deal with ongoing human activities' cumulative effects. Our aim, using a holistic impact assessment approach, was to inform management steps for coral reefs in Brazil by determining their exposure to various stressors. An index of the risk to cumulative impacts is estimated by the following measures: with uniformity of coral reefs' susceptibility to stressors and using impact weights to represent varying tolerance levels of coral reefs to each stressor. Without and with reports on sensitivity, 16% and 37% of coral reefs had a high risk of cumulative harm, and 42% of reefs had low risk of cumulative effects from both local and global stressors, with 16% and 37 percent showing high risks of cumulative impacts. We demonstrate how strategic planning decisions can be derived from local and global stressors.

Source link: https://doi.org/10.3390/d10020026

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions