White lies for coral reefs: Dynamics of two-patch coral reefs model with asymmetric dispersal

Journal of Theoretical Biology, Journal Year: 2025, Volume and Issue: unknown, P. 112046 - 112046

Published: Jan. 1, 2025

Language: Английский

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Landscape‐scale patterns of nutrient enrichment in a coral reef ecosystem: implications for coral to algae phase shifts

Ecological Applications, Journal Year: 2020, Volume and Issue: 31(1)

Published: Sept. 24, 2020

Nutrient pollution is altering coastal ecosystems worldwide. On coral reefs, excess nutrients can favor the production of algae at expense reef-building corals, yet role in driving community changes such as shifts from to macroalgae not well understood. Here we investigate potential anthropogenic nutrient loading recent coral-to-macroalgae phase on reefs lagoons surrounding Pacific island Moorea, French Polynesia. We use nitrogen (N) tissue content and stable isotopes (δ15 N) an abundant macroalga (Turbinaria ornata) together with empirical models discharge describe spatial temporal patterns enrichment lagoons. then employ time series data test whether increases are associated nutrients. Our results revealed that N were linked several factors, including rainfall, wave-driven circulation, distance sources, especially human sewage. Reefs near large watersheds, where inputs sewage agriculture high, have been consistently enriched for least last decade. In many these areas, corals decreased increased, while lower levels input maintained high cover low macroalgae. Importantly, patchy occurred despite substantial island-wide density biomass herbivorous fishes over period. Together, indicate may be important driver Moorea even though harbor diverse herbivore assemblage. These emphasize bottom-up factors play underscore critical importance watershed management reducing other land-based pollutants reef ecosystems.

Language: Английский

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Ecological status and resilience of coral reefs in South-Central Vietnam (Khanh Hoa Province) in the third decade of the 21st century

Regional Studies in Marine Science, Journal Year: 2025, Volume and Issue: unknown, P. 104074 - 104074

Published: Feb. 1, 2025

Language: Английский

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Global coral reef ecosystems exhibit declining calcification and increasing primary productivity

Communications Earth & Environment, Journal Year: 2021, Volume and Issue: 2(1)

Published: June 10, 2021

Abstract Long-term coral reef resilience to multiple stressors depends on their ability maintain positive calcification rates. Estimates of ecosystem and organic productivity provide insight into the environmental drivers temporal changes in condition. Here, we analyse global spatiotemporal trends using a meta-analysis ecosystem-scale case studies. A linear mixed effects regression model was used test whether is related seasonality, methodology, calcifier cover, year, depth, wave action, latitude, duration data collection, state, Ω ar , temperature productivity. Global estimated from seawater carbonate chemistry driven primarily by depth benthic cover. Current future declines cover will significantly affect budget, even before considering sub-lethal Repeatedly studied reefs exhibited declining 4.3 ± 1.9% per year ( x̄ = 1.8 0.7 mmol m −2 d −1 yr ), increasing at 3.0 0.8 since 1970. Therefore, ecosystems are experiencing shift essential metabolic processes photosynthesis, could become net dissolving worldwide around 2054.

Language: Английский

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A critical evaluation of benthic phase shift studies on coral reefs

Marine Environmental Research, Journal Year: 2022, Volume and Issue: 178, P. 105667 - 105667

Published: May 25, 2022

Language: Английский

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Cumulative impacts across Australia’s Great Barrier Reef: a mechanistic evaluation

Ecological Monographs, Journal Year: 2021, Volume and Issue: 92(1)

Published: Oct. 29, 2021

Abstract Cumulative impacts assessments on marine ecosystems have been hindered by the difficulty of collecting environmental data and identifying drivers community dynamics beyond local scales. On coral reefs, an additional challenge is to disentangle relative influence multiple that operate at different stages ontogeny. We integrated life history, population dynamics, spatially explicit assess cumulative stressors across 2,300 km world’s largest reef ecosystem, Australia’s Great Barrier Reef (GBR). Using literature data, we characterized relationships between history processes (reproduction, larval dispersal, recruitment, growth, mortality) variables. then simulated demographics stressor organism (coral colony) level >3,800 individual reefs linked connectivity exposed temporally realistic regimes acute (crown‐of‐thorns starfish outbreaks, cyclones, mass bleaching) chronic (water‐quality) stressors. Model simulations produced a credible reconstruction recent (2008–2020) trajectories consistent with monitoring observations, while estimating each regional Overall, populations declined one‐third GBR, from average ~29% ~19% hard cover. By 2020, <20% GBR had cover higher than 30%, status health corroborated scarce sparsely distributed data. Reef‐wide annual rates mortality were driven bleaching (48%) ahead cyclones (41%) predation (11%). Beyond reconstructed trends, model enabled emergence complex interactions compound effects promoting mechanistic understanding dynamics. Drivers growth identified; notably, water quality (suspended sediments) was estimated delay recovery for least 25% inshore reefs. Standardized loss allowed integration all determine equilibrium reef. This metric, combined maps impacts, potential, water‐quality thresholds, state metrics, facilitates strategic spatial planning resilience‐based management GBR.

Language: Английский

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A mechanistic model of coral bleaching due to temperature-mediated light-driven reactive oxygen build-up in zooxanthellae

Ecological Modelling, Journal Year: 2018, Volume and Issue: 386, P. 20 - 37

Published: Aug. 16, 2018

Language: Английский

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Important ecosystem function, low redundancy and high vulnerability: The trifecta argument for protecting the Great Barrier Reef's tabular Acropora

Conservation Letters, Journal Year: 2021, Volume and Issue: 14(5)

Published: June 1, 2021

Abstract Identifying organisms that play an important role in maintaining ecosystem function is a key aspect of resilience‐based management. For Australia's Great Barrier Reef (GBR), we found the recovery ability shallow exposed fore‐reefs more than 14 times higher when tabular Acropora are present. The disproportionate appears to be driven by combination traits including high recruitment, growth rate and, importantly, large maximum colony sizes. Despite this role, highly sensitive most pressures. We compile evidence suggesting if corals were decline or disappear on GBR, potential for reef would considerably slowed. then consider merits placing special emphasis protection within management GBR. Importantly, recognise analysis costs and benefits such recognition vital before any change implemented. Actions might include targeted crown‐of‐thorns starfish control, anchoring restrictions reefs identified as essential their larval dispersal. In addition, communications about critical importance these recognisable may boost community support participation protection.

Language: Английский

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Predicting Responses of Geo-ecological Carbonate Reef Systems to Climate Change: A Conceptual Model and Review

CRC Press eBooks, Journal Year: 2021, Volume and Issue: unknown, P. 229 - 370

Published: Sept. 22, 2021

230Coral reefs provide critical ecological and geomorphic (e.g. sediment production for reef-fronted shoreline maintenance) services, which interact in complex dynamic ways. These services are under threat from climate change, requiring modelling approaches that predict how reef systems will respond to different future scenarios. Carbonate budgets, estimate net calcium carbonate production, a comprehensive 'snap-shot' assessment of accretionary potential stability. however, were not intended account the full suite processes maintain coral or predictive capacity on longer timescales (decadal centennial). To dual challenges enhancing budget assessments advancing their capacity, we applied novel model elicitation review method create qualitative geo-ecological system links geomorphic, physical processes. Our approach conceptualizes relationships between transport landform stability, rates knowledge confidence reveal major gaps research pathways. The provides blueprint aims quantify dynamics, improving our responses shorelines change.

Language: Английский

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Impact of catchment-derived nutrients and sediments on marine water quality on the Great Barrier Reef: An application of the eReefs marine modelling system

Marine Pollution Bulletin, Journal Year: 2021, Volume and Issue: 167, P. 112297 - 112297

Published: April 23, 2021

Water quality of the Great Barrier Reef (GBR) is determined by a range natural and anthropogenic drivers that are resolved in eReefs coupled hydrodynamic - biogeochemical marine model forced process-based catchment model, GBR Dynamic SedNet. Model simulations presented here quantify impact loads sediments nutrients on water variables. Simulations 2011–2018 show reduction results improved quality, especially within river plumes. Within 16 plumes, increased chlorophyll concentration 0.10 (0.02–0.25) mg Chl m−3. Reductions following proposed 2050 Quality Improvement Plan targets reduced plumes 0.04 (0.01–0.10) Our demonstrate benefits management.

Language: Английский

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