Role of host genetics and heat‐tolerant algal symbionts in sustaining populations of the endangered coral Orbicella faveolata in the Florida Keys with ocean warming

Global Change Biology, Journal Year: 2018, Volume and Issue: 25(3), P. 1016 - 1031

Published: Dec. 15, 2018

Abstract Identifying which factors lead to coral bleaching resistance is a priority given the global decline of reefs with ocean warming. During second year back‐to‐back events in Florida Keys 2014 and 2015, we characterized key environmental biological associated resilience threatened reef‐building Orbicella faveolata . Ten (five inshore, five offshore, 179 corals total) were sampled during (September 2015) recovery (May 2016). Corals genotyped 2b RAD profiled for algal symbiont abundance type. O. at inshore sites, despite higher temperatures, demonstrated significantly better compared offshore. The thermotolerant Durusdinium trenchii (formerly Symbiondinium ) was dominant endosymbiont type region‐wide initial (78.0% sampled) final (77.2%) sampling; >90% nonbleached dominated by D. host genotyping found no genetic structure among reefs, but sites showed high level clonality. While none measured parameters correlated bleaching, 71% variation 73% proportion attributable differences between genets, highlighting leading role genetics shaping natural patterns. Notably, rarely from previous studies, even bleaching. likely driven repeated two warmest years on record (2014 2015). On Upper Keys, most abundant, had highest resistance, contained , illustrating causal link heat tolerance ecosystem change.

Language: Английский

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Coral Reefs Under Climate Change and Ocean Acidification: Challenges and Opportunities for Management and Policy

Annual Review of Environment and Resources, Journal Year: 2016, Volume and Issue: 41(1), P. 59 - 81

Published: Aug. 2, 2016

Carbon emissions in an industrialized world have created two problems for coral reefs: climate change and ocean acidification. Climate drives warming, which impacts biological ecological reef processes, triggers large-scale bleaching events, fuels tropical storms. Ocean acidification slows growth, alters competitive interactions, impairs population replenishment. For managers policymakers, warming represent almost paradoxical challenge by eroding resilience simultaneously increasing the demand resilience. Here, I address this problem context of challenges potential solutions. Management efforts can compensate reduced face global change, but to a limited extent over time frame. Critically, realistic perspective on what sustainability measures be achieved reefs is important avoid setting unachievable goals regional local-scale management programs.

Language: Английский

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Ocean acidification drives community shifts towards simplified non-calcified habitats in a subtropical−temperate transition zone

Scientific Reports, Journal Year: 2018, Volume and Issue: 8(1)

Published: July 23, 2018

Abstract Rising atmospheric concentrations of carbon dioxide are causing surface seawater pH and carbonate ion to fall in a process known as ocean acidification. To assess the likely ecological effects acidification we compared intertidal subtidal marine communities at increasing levels p CO 2 recently discovered volcanic seeps off Pacific coast Japan (34° N). This study region is particular interest for research it has naturally low (280–320 µatm) located transition zone between temperate sub-tropical communities. We provide first assessment biogeographic boundary. Marine exposed mean predicted by 2050 experienced periods aragonite saturation high dissolved inorganic carbon. These two factors combined cause marked community shifts major decline biodiversity, including loss key habitat-forming species, with even more extreme changes expected 2100. Our results empirical evidence that near-future shift ecosystems from fleshy algal dominated systems, accompanied biodiversity simplification ecosystem.

Language: Английский

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Functional biodiversity loss along natural CO2 gradients

Nature Communications, Journal Year: 2018, Volume and Issue: 9(1)

Published: Nov. 28, 2018

Abstract The effects of environmental change on biodiversity are still poorly understood. In particular, the consequences shifts in species composition for marine ecosystem function largely unknown. Here we assess loss functional diversity, i.e. range biological traits, benthic communities exposed to ocean acidification (OA) by using natural CO 2 vent systems. We found that richness is greatly reduced with acidification, and more pronounced than corresponding decrease taxonomic diversity. acidified conditions, most organisms accounted a few entities (i.e. unique combination traits), resulting low redundancy. These results suggest not buffered redundancy under OA, even highly diverse assemblages, such as rocky communities.

Language: Английский

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Reef-building corals thrive within hot-acidified and deoxygenated waters

Scientific Reports, Journal Year: 2017, Volume and Issue: 7(1)

Published: May 22, 2017

Abstract Coral reefs are deteriorating under climate change as oceans continue to warm and acidify thermal anomalies grow in frequency intensity. In vitro experiments widely used forecast reef-building coral health into the future, but often fail account for complex ecological biogeochemical interactions that govern reefs. Consequently, observations from communities naturally occurring extremes have become central improved predictions of future reef form function. Here, we present a semi-enclosed lagoon system New Caledonia characterised by diel fluctuations hot-deoxygenated water coupled with tidally driven persistently low pH, relative neighbouring within exhibited high richness (number species = 20) cover (24–35% across sites). Calcification rates key ( Acropora formosa , pulchra Coelastrea aspera Porites lutea ) populations were equivalent to, or reduced ca . 30–40% compared those reef. Enhanced respiration, alongside particulate organic content sediment, suggests acclimatisation this trio temperature, oxygen pH changes through heterotrophic plasticity. This therefore provides novel understand climatic scenarios may serve reservoir already resistant extreme environmental conditions.

Language: Английский

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Validation of Reef-Scale Thermal Stress Satellite Products for Coral Bleaching Monitoring

Remote Sensing, Journal Year: 2016, Volume and Issue: 8(1), P. 59 - 59

Published: Jan. 12, 2016

Satellite monitoring of thermal stress on coral reefs has become an essential component reef management practice around the world. A recent development by U.S. National Oceanic and Atmospheric Administration’s Coral Reef Watch (NOAA CRW) program provides daily global at 5 km resolution—at or near scale most reefs. In this paper, we introduce two new products in CRW Decision Support System for management: Regional Virtual Stations, a regional synthesis conditions, Seven-day Sea Surface Temperature (SST) Trend, describing changes temperature each location. We describe how these provided information support activities prior to, during after 2014 event Commonwealth Northern Mariana Islands (CNMI). Using situ survey data from event, undertake first quantitative comparison between satellite bleaching observations. Analysis community characteristics, historical conditions revealed strong influence biodiversity patterns observed bleaching. This resulted model based generic richness that explained 97% variance These findings illustrate importance using local benthic characteristics to interpret level impact exposure. era continuing climate change, accurate prediction are stakeholders direct resources effective actions conserve

Language: Английский

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Insights from extreme coral reefs in a changing world

Coral Reefs, Journal Year: 2020, Volume and Issue: 39(3), P. 495 - 507

Published: June 1, 2020

Language: Английский

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Mangrove lagoons of the Great Barrier Reef support coral populations persisting under extreme environmental conditions

Marine Ecology Progress Series, Journal Year: 2019, Volume and Issue: 625, P. 1 - 14

Published: July 18, 2019

MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsTheme Sections 625:1-14 (2019) - DOI: https://doi.org/10.3354/meps13073 FEATURE ARTICLE Mangrove lagoons of Great Barrier Reef support coral populations persisting under extreme environmental conditions Emma F. Camp1,*, John Edmondson2, Annabelle Doheny1,2, Rumney3, Amanda J. Grima1, Alfredo Huete1, David Suggett1 1University Technology Sydney, Climate Change Cluster, Ultimo NSW 2007, Australia 2Wavelength Cruises, Port Douglas, QLD 4877, 3Great Legacy, *Corresponding author: [email protected] ABSTRACT: Global degradation reefs has increased urgency identifying stress-tolerant populations, enhance understanding biology driving stress tolerance, as well stocks stress-hardened aid reef rehabilitation. Surprisingly, scientists are continually discovering that naturally environments house established adapted grow within abiotic comparable seawater predicted over coming century. Such include inshore mangrove carry previously unrecognised ecosystem service value for corals, spanning from refuge preconditioning. However, existence such hot-spots resilience on (GBR) remains entirely unknown. Here we describe, first time, 2 GBR (Woody Isles and Howick Island), exposing taxonomically diverse communities (34 species, 7 growth morphologies) regular low pH (<7.6), oxygen (<1 mg l-1) highly variable temperature range (>7°C) conditions. Coral cover was typically (<5%), but patchy included colonies (>0.5 m diameter), with net photosynthesis calcification rates dominant species (Acropora millepora, Porites lutea) reduced (20-30%), respiration enhanced (11-35%), in lagoon relative adjacent reefs. Further analysis revealed physiological plasticity (photosynthetic ‘strategy’) flexibility Symbiodiniaceae taxa associations appear crucial supporting capacity thrive lagoon. Prevalence corals these (and elsewhere) increasingly challenge stressors, highlight need study unfavourable better resolve mechanisms tolerance. KEY WORDS: · Extreme Mangroves change Marginal Warming Ocean acidification Full text pdf format Information about this Feature Article Supplementary material NextCite article as: Camp EF, Edmondson J, Doheny A, Rumney Grima AJ, Huete Suggett DJ Mar Ecol Prog Ser 625:1-14. Export citation Tweet linkedIn Cited by Published Vol. 625. Online publication date: August 29, 2019 Print ISSN: 0171-8630; 1616-1599 Copyright © Inter-Research.

Language: Английский

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Functional changes across marine habitats due to ocean acidification

Global Change Biology, Journal Year: 2024, Volume and Issue: 30(1)

Published: Jan. 1, 2024

Global environmental change drives diversity loss and shifts in community structure. A key challenge is to better understand the impacts on ecosystem function connect species trait of assemblages with properties that are turn linked functioning. Here we quantify composition associated ocean acidification (OA) by using field measurements at marine CO

Language: Английский

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Interactive effects of temperature and p CO ₂ on sponges: from the cradle to the grave

Global Change Biology, Journal Year: 2016, Volume and Issue: 23(5), P. 2031 - 2046

Published: Aug. 23, 2016

As atmospheric CO2 concentrations rise, associated ocean warming (OW) and acidification (OA) are predicted to cause declines in reef-building corals globally, shifting reefs from coral-dominated systems those dominated by less sensitive species. Sponges important structural functional components of coral reef ecosystems, but despite increasing field-based evidence that sponges may be 'winners' response environmental degradation, our understanding how they respond the combined effects OW OA is limited. To determine tolerance adult climate change, four abundant Great Barrier Reef species were experimentally exposed levels for 2100, under two Representative Concentration Pathways (RCPs). The impact on early life-history stages was also assessed one these provide a more holistic view impacts. All generally unaffected conditions RCP6.0, although projected RCP8.5 caused significant adverse effects: with elevated temperature decreasing survival all species, tissue necrosis bleaching, elevating respiration rates photosynthetic rates. alone had little effect, even concentrations. Importantly, interactive effect varied between different nutritional modes, pCO2 exacerbating stress heterotrophic mitigating phototrophic This antagonistic interaction reflected reduced mortality, bleaching highest OW/OA treatment. Survival settlement success Carteriospongia foliascens larvae experimental treatments, juvenile exhibited greater than their counterparts. With providing protection temperature, across life stages, change ultimately drive shift composition sponge assemblages towards dominance

Language: Английский

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