Limited coral mortality following acute thermal stress and widespread bleaching on Palmyra Atoll, central Pacific

Coral Reefs, Journal Year: 2019, Volume and Issue: 38(4), P. 701 - 712

Published: April 4, 2019

Language: Английский

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Direct and indirect effects of climate change‐amplified pulse heat stress events on coral reef fish communities

Ecological Applications, Journal Year: 2020, Volume and Issue: 30(6)

Published: March 13, 2020

Abstract Climate change‐amplified temperature anomalies pose an imminent threat to coral reef ecosystems. While much focus has been placed on the effects of heat stress scleractinian corals—including bleaching, mortality, and loss structural complexity—and many studies have documented changes fish communities arising indirectly from shifts in benthic composition, direct impacts are less well understood. Here, we quantify indirect fishes, using underwater visual censuses conducted before, during, after 2015–2016 El Niño‐induced global bleaching event. Surveys took place at epicenter this event, 16 sites Kiritimati (Republic Kiribati; central equatorial Pacific) spanning across a gradient local human disturbance. We expected that would both negative community, with resulting physiological during event manifesting afterward as consequence ability recover following depend levels found total biomass abundance declined by >50% stress, likely result vertical migration cooler waters. One year cessation however, biomass, abundance, species richness had recovered to, or even exceeded, pre‐heat levels. However, corallivores over 70% severe loss, reefs exposed higher disturbance showed impaired recovery stress. These findings enhance understanding projected climate change‐associated marine heatwaves highlight interacting stressors vital component

Language: Английский

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Mesophotic coral communities escape thermal coral bleaching in French Polynesia

Royal Society Open Science, Journal Year: 2021, Volume and Issue: 8(11)

Published: Nov. 1, 2021

Climate change and consequent coral bleaching are causing the disappearance of reef-building corals worldwide. While episodes significantly impact shallow waters, little is known about their on mesophotic communities. We studied prevalence two to three months after a heat stress event, along an extreme depth range from 6 90 m in French Polynesia. Bayesian modelling showed decreasing probability all genera over depth, with no observed at lower depths (greater than or equal 60 m). found that depth-generalist benefit more increasing depth-specialists (corals narrow range). Our data suggest reduced especially upper (40 m), had stronger relation light-irradiance attenuation temperature. acknowledging geographical temporal variability role reefs as spatial refuges during thermal stress, we ought understand why reduces depth. Future studies should consider repeated monitoring detailed ecophysiological environmental data. study demonstrated how may offer level protection communities could escape impacts event.

Language: Английский

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El Niño/Southern Oscillation inhibited by submesoscale ocean eddies

Nature Geoscience, Journal Year: 2022, Volume and Issue: 15(2), P. 112 - 117

Published: Feb. 1, 2022

Abstract The El Niño/Southern Oscillation is characterized by irregular warm (El Niño) and cold (La Niña) events in the tropical Pacific Ocean, which have substantial global environmental socioeconomic impacts. These are generally attributed to instability of basin-scale air–sea interactions equatorial Pacific. However, role sub-basin-scale processes life cycle remains unknown due scarcity observations coarse resolution climate models. Here, using a long-term high-resolution simulation, we find that ocean eddies with horizontal wavelengths less than several hundred kilometres substantially inhibit growth La Niña Niño events. submesoscale regulated intensity cold-tongue temperature fronts. generate an anomalous surface cooling tendency during inducing reduced upward heat flux from subsurface central-eastern Pacific; opposite occurs Niña. This dampening effect missing majority state-of-the-art Our findings identify pathway resolve long-standing overestimation amplitudes simulations.

Language: Английский

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Mechanisms underlying the epipelagic ecosystem response to ENSO in the equatorial Pacific ocean

Progress In Oceanography, Journal Year: 2023, Volume and Issue: 213, P. 103002 - 103002

Published: March 2, 2023

Language: Английский

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ENSO‐Driven Ocean Extremes and Their Ecosystem Impacts

Geophysical monograph, Journal Year: 2020, Volume and Issue: unknown, P. 409 - 428

Published: Oct. 23, 2020

El Niño–Southern Oscillation (ENSO) events can cause extremes in the ocean environment that have substantial impacts on marine ecosystems. In shallow-water/coastal environment, ENSO-related sea level and seawater temperature been found to impact coral, kelp, seagrass, mangrove Coastal from include exposure of shallow-water ecosystems inundation low-lying areas. Ocean extremes, including heatwaves, coral bleaching kelp seagrass density. This chapter reviews knowledge understanding ENSO's role their these key

Language: Английский

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Increased diversity and concordant shifts in community structure of coral‐associated Symbiodiniaceae and bacteria subjected to chronic human disturbance

Molecular Ecology, Journal Year: 2020, Volume and Issue: 29(13), P. 2477 - 2491

Published: June 4, 2020

Both coral-associated bacteria and endosymbiotic algae (Symbiodiniaceae spp.) are vitally important for the biological function of corals. Yet little is known about their co-occurrence within corals, how diversity varies across coral species, or they impacted by anthropogenic disturbances. Here, we sampled colonies (n = 472) from seven encompassing a range life history traits, gradient chronic human disturbance 11 sites on Kiritimati [Christmas] atoll) in central equatorial Pacific, quantified sequence assemblages community structure associated Symbiodiniaceae bacterial communities. Although alpha did not vary with disturbance, was consistently higher Shannon richness, richness sample almost doubling low to very high disturbance. Chronic also altered microbial beta bacteria, including changes both increased variation (dispersion) We found concordance between structure, when all corals were considered together, individually two massive Hydnophora microconos Porites lobata, implying that symbionts respond similarly these species. Finally, dominant ancestral lineage colony differential abundances several distinct taxa. These results suggest communities may be reliable indicator stress microbiome, there concordant responses at whole-ecosystem scale.

Language: Английский

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Bacterial Communities Vary from Different Scleractinian Coral Species and between Bleached and Non-Bleached Corals

Microbiology Spectrum, Journal Year: 2023, Volume and Issue: 11(3)

Published: May 16, 2023

Bleaching is one of the most relevant factors implicated in integrity coral reef ecosystems, with increasing frequency and intensity damaging events representing a serious threat to biodiversity. Here, we analyzed changes coral-associated bacteria from three types non-bleached bleached scleractinian corals (Acropora digitifera, Galaxea fascicularis, Porites pukoensis) Hainan Luhuitou peninsula coastal areas. The community structure symbiotic differed significantly among apparently healthy corals. had higher bacterial alpha diversity some specific genera, including Ruegeria, Methyloceanibacter, Filomicrobium, Halioglobus, Rubripirellula, Rhodopirellula, Silicimonas, Blastopirellula, Sva0996 marine group, Woeseia, unclassified_c_Gammaproteobacteria, were consistently increased groups. Network analysis revealed different degrees modularity between groups at genus level, proportion links was dominated by positive co-occurrences. Functional prediction illustrated that remained relatively consistent Structure equation modeling function directly influenced host environment factors. These findings suggested responses bleaching occur host-dependent manner, informing novel strategies for restoring aiding adaption stress. IMPORTANCE Accumulating evidence indicates play an important role health holobionts. However, variability species statuses remains largely unknown. investigated apparent (healthy) (sampled situ), involving related profiles, composition, diversity, network relationship, potential function. Structural used analyze relationship status abiotic biotic shown exhibit host-specific traits. Both environmental impacts primary effects on microbial communities. Future studies are needed identify mechanisms mediate divergent consortia.

Language: Английский

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Considerations for determining warm-water coral reef tipping points

Earth System Dynamics, Journal Year: 2025, Volume and Issue: 16(1), P. 275 - 292

Published: Feb. 7, 2025

Abstract. Warm-water coral reefs are facing unprecedented human-driven threats to their continued existence as biodiverse functional ecosystems upon which hundreds of millions people rely. These impacts may drive past critical thresholds, beyond the system reorganises, often abruptly and potentially irreversibly; this is what Intergovernmental Panel on Climate Change (IPCC, 2022) define a tipping point. Determining point thresholds for reef requires robust assessment multiple stressors interactive effects. In perspective piece, we draw recent global revision initiative (Lenton et al., 2023a) literature search identify summarise diverse range interacting that need be considered determining warm-water ecosystems. Considering observed projected stressor impacts, endorse revision's conclusion mean surface temperature (relative pre-industrial) threshold 1.2 °C (range 1–1.5 °C) long-term atmospheric CO2 concentrations above 350 ppm, while acknowledging comprehensive stressors, including ocean warming response dynamics, overshoot, cascading have yet sufficiently realised. already been exceeded, therefore these systems in an overshoot state reliant policy actions bring levels back within limits. A fuller likely further lower most cases. Uncertainties around points such crucially important underline imperative and, case knowledge gaps, employing precautionary principle favouring lower-range values.

Language: Английский

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Analyzing Coral Reef Degradation in Indonesia Using O’Hara's Principles of Political Economy

Published: Jan. 1, 2025

Language: Английский

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