Catchment to sea connection: Impacts of terrestrial run-off on benthic ecosystems in American Samoa

Marine Pollution Bulletin, Год журнала: 2021, Номер 169, С. 112530 - 112530

Опубликована: Июнь 1, 2021

Язык: Английский

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Coral reef ecological pump for gathering and retaining nutrients and exporting carbon: a review and perspectives

Acta Oceanologica Sinica, Год журнала: 2023, Номер 42(6), С. 1 - 15

Опубликована: Июнь 1, 2023

Язык: Английский

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Anthropogenic nitrogen pollution threats and challenges to the health of South Asian coral reefs

Frontiers in Marine Science, Год журнала: 2023, Номер 10

Опубликована: Май 24, 2023

Nitrogen pollution is a widespread and growing problem in the coastal waters of South Asia yet ecological impacts on region’s coral ecosystems are currently poorly known understood. hosts just under 7% global reef coverage but has experienced significant loss recent decades. The extent to which this ecosystem decline at regional scale can be attributed multiple threats posed by nitrogen been largely overlooked literature. Here, we assess evidence for corals central Indian Ocean India, Sri Lanka Maldives. We find that there limited with clearly demonstrate reefs from pollution, including its interactions other stressors such as seawater warming. However, does not prove no impacts, rather it reflects paucity appropriate observations related understanding range potential individual, species levels. This situation presents research, management conservation challenges given wide acceptance problematic. Following this, recommend more systematic collection sharing robust observations, modelling experimentation provide baseline base prescient control action.

Язык: Английский

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Critical Review and Conceptual and Quantitative Models for the Transfer and Depuration of Ciguatoxins in Fishes

Toxins, Год журнала: 2021, Номер 13(8), С. 515 - 515

Опубликована: Июль 23, 2021

We review and develop conceptual models for the bio-transfer of ciguatoxins in food chains Platypus Bay Great Barrier Reef on east coast Australia. is unique repeatedly producing ciguateric fishes Australia, with produced by benthic dinoflagellates (Gambierdiscus spp.) growing epiphytically free-living, macroalgae. The Gambierdiscus are consumed invertebrates living within macroalgae, which preyed upon small carnivorous fishes, then Spanish mackerel (Scomberomorus commerson). hypothesise that and/or Fukuyoa species turf algae main source entering marine to cause ciguatera Reef. abundance surgeonfish feed may act as a feedback mechanism controlling flow through this chain. If hypothesis broadly applicable, reduction herbivory from overharvesting herbivores could lead increases concentrating remaining, smaller population herbivores. Modelling dilution somatic growth coral trout (Plectropomus leopardus) revealed not significantly reduce toxicity fish flesh, except young fast-growing or legal-sized contaminated low levels ciguatoxins. along Australia can depurate ciguatoxins, it most likely half-life ≤1-year. Our aid management research globally.

Язык: Английский

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Nutrient pollution alters the gut microbiome of a territorial reef fish

Marine Pollution Bulletin, Год журнала: 2021, Номер 169, С. 112522 - 112522

Опубликована: Июнь 4, 2021

Язык: Английский

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Responses of the coral reef cryptobiome to environmental gradients in the Red Sea

PLoS ONE, Год журнала: 2024, Номер 19(4), С. e0301837 - e0301837

Опубликована: Апрель 16, 2024

An essential component of the coral reef animal diversity is species hidden in crevices within matrix, referred to as cryptobiome. These organisms play an important role nutrient cycling and provide abundant food source for higher trophic levels, yet they have been largely overlooked. Here, we analyzed distribution patterns mobile cryptobiome (>2000 μm) along latitudinal gradient Saudi Arabian coast Red Sea. Analysis was conducted based on 54 Autonomous Reef Monitoring Structures. We retrieved a total 5273 organisms, from which 2583 DNA sequences mitochondrially encoded cytochrome c oxidase I were generated through sanger sequencing. found that community variable over short geographical distances basin. Regression tree models identified sea surface temperature (SST), percentage cover hard turf algae determinant number operational taxonomic units present per Structures (ARMS). Our results also show structure associated with energy available (measured photosynthetic active radiation), temperature, nearby habitat characteristics (namely corals, macroalgae). Given benthic affect cryptobiome, current scenarios intensive climate change are likely modify this fundamental biological functioning. However, trajectory unknow can be site specific, example, expected increase above SST 28.5°C, decreasing cover. This study provides baseline cryptobenthic prior major coastal developments Sea used future biodiversity studies monitoring projects. It contribute better understand period where Marine Protected Areas being discussed region.

Язык: Английский

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In situ eutrophication stimulates dinitrogen fixation, denitrification, and productivity in Red Sea coral reefs

Marine Ecology Progress Series, Год журнала: 2020, Номер 645, С. 55 - 66

Опубликована: Апрель 30, 2020

Eutrophication (i.e. the increase of [in-]organic nutrients) may affect functioning coral reefs, but knowledge about effects on nitrogen (N) cycling and its relationship to productivity within benthic reef communities is scarce. Thus, we investigated how in situ manipulated eutrophication impacted along with 2 counteracting N-cycling pathways (dinitrogen [N ]-fixation, denitrification), using a combined acetylene assay. We hypothesised that N -fixation would decrease denitrification response eutrophication. fluxes (measured as dark light oxygen assessed incubation experiments) were determined for 3 dominant functional groups (reef sediments, turf algae, scleractinian Pocillopora verrucosa ) after 8 wk nutrient enrichment central Red Sea. Using slow-release fertiliser, increased dissolved inorganic concentration by up 7-fold compared ambient concentrations. Experimental stimulated both across all 2- 4-fold, respectively. Productivity doubled sediments remained stable algae P. . Our data therefore suggest (1) are major -fixers while widespread among groups; (2) surprisingly, contrary our hypothesis, involved moderate eutrophication, (3) not directly influenced productivity. findings underline importance ubiquity microbial (Red Sea) reefs sensitivity

Язык: Английский

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Antifouling coatings can reduce algal growth while preserving coral settlement

Scientific Reports, Год журнала: 2022, Номер 12(1)

Опубликована: Сен. 24, 2022

Abstract In the early stages after larval settlement, coral spat can be rapidly overgrown and outcompeted by algae, reducing overall survival for reef replenishment supply restoration programs. Here we investigated three antifouling (AF) coatings their ability to inhibit algal fouling on settlement plugs, a commonly-used substrate. Plugs were either fully or partially coated with AF incubated in mesocosm systems partial recirculation 37 days track succession. addition, of Acropora tenuis larvae was measured determine whether deterrent. Uncoated control plugs became heavily fouled, yielding only 4–8% bare substrate upper surfaces days. During this period, an encapsulated dichlorooctylisothiazolinone (DCOIT)-coating most effective fouling, 61–63% Antiadhesive cerium dioxide (CeO 2−x ) nanoparticle (NP) less effective, 11–17% 2% substrate, respectively. Average A. types AF-coated did not statistically differ from uncoated controls. However, NP-coating generally highest significantly higher than found antiadhesive- DCOIT-coating. Furthermore, partially-covered coatings, NP- areas DCOIT-areas. These results demonstrate that reduce intensity biologically-relevant timescales while preserving robust levels settlement. This represents important step towards fine-scale competition benthic organisms breeding propagation.

Язык: Английский

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Unexpected role of communities colonizing dead coral substrate in the calcification of coral reefs

Limnology and Oceanography, Год журнала: 2021, Номер 66(5), С. 1793 - 1803

Опубликована: Март 17, 2021

Abstract Global and local anthropogenic stressors such as climate change, acidification, overfishing, pollution are expected to shift the benthic community composition of coral reefs from dominance by calcifying organisms non‐calcifying algae. These changes could reduce ability reef ecosystems maintain positive net calcium carbonate accretion. However, relationships between calcification rates remain unclear. We performed field experiments quantify metabolic two most dominant substrate types, live dead colonized a mixed algal assemblage, using novel underwater respirometer. Our results revealed that in daytime were similar for communities. dark, while corals continued calcify at slower rates, communities exhibited dissolution. Daytime photosynthesis was up five times much corals, which we hypothesize may have created favorable conditions precipitation minerals. conclude that: (1) can contribute during day, (2) also mineral dissolution night, decreasing ecosystem over diel cycle. This provides evidence slow, long‐term accretion state where large daily cycling occurs, but with little or no accumulation minerals needed sustain against erosional forces.

Язык: Английский

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Coral and it's symbionts responses to the typical global marine pollutant BaP by 4D-Proteomics approach

Environmental Pollution, Год журнала: 2022, Номер 307, С. 119440 - 119440

Опубликована: Май 24, 2022

Язык: Английский

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