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Coral Reefs

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https://www.readbyqxmd.com/read/28550298/opposite-polarities-of-enso-drive-distinct-patterns-of-coral-bleaching-potentials-in-the-southeast-indian-ocean
#1
Ningning Zhang, Ming Feng, Harry H Hendon, Alistair J Hobday, Jens Zinke
Episodic anomalously warm sea surface temperature (SST) extremes, or marine heatwaves (MHWs), amplify ocean warming effects and may lead to severe impacts on marine ecosystems. MHW-induced coral bleaching events have been observed frequently in recent decades in the southeast Indian Ocean (SEIO), a region traditionally regarded to have resilience to global warming. In this study, we assess the contribution of El Niño-Southern Oscillation (ENSO) to MHWs across the mostly understudied reefs in the SEIO. We find that in extended summer months, the MHWs at tropical and subtropical reefs (divided at ~20°S) are driven by opposite ENSO polarities: MHWs are more likely to occur at the tropical reefs during eastern Pacific El Niño, driven by enhanced solar radiation and weaker Australian Monsoon, some likely alleviated by positive Indian Ocean Dipole events, and at the subtropical reefs during central Pacific La Niña, mainly caused by increased horizontal heat transport, and in some cases reinforced by local air-sea interactions...
May 26, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28550297/reef-building-corals-thrive-within-hot-acidified-and-deoxygenated-waters
#2
Emma F Camp, Matthew R Nitschke, Riccardo Rodolfo-Metalpa, Fanny Houlbreque, Stephanie G Gardner, David J Smith, Marco Zampighi, David J Suggett
Coral reefs are deteriorating under climate change as oceans continue to warm and acidify and thermal anomalies grow in frequency and intensity. In vitro experiments are widely used to forecast reef-building coral health into the future, but often fail to account for the complex ecological and biogeochemical interactions that govern reefs. Consequently, observations from coral communities under naturally occurring extremes have become central for improved predictions of future reef form and function. Here, we present a semi-enclosed lagoon system in New Caledonia characterised by diel fluctuations of hot-deoxygenated water coupled with tidally driven persistently low pH, relative to neighbouring reefs...
May 26, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28546553/symbiont-community-stability-through-severe-coral-bleaching-in-a-thermally-extreme-lagoon
#3
E G Smith, G O Vaughan, R N Ketchum, D McParland, J A Burt
Coral reefs are threatened by climate change as coral-algal symbioses are currently living close to their upper thermal limits. The resilience of the algal partner plays a key role in determining the thermal tolerance of the coral holobiont and therefore, understanding the acclimatory limits of present day coral-algal symbioses is fundamental to forecasting corals' responses to climate change. This study characterised the symbiont community in a highly variable and thermally extreme (Max = 37.5 °C, Min = 16...
May 25, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28542538/new-evidence-indicates-the-presence-of-barracuda-sphyraenidae-and-supports-a-tropical-marine-environment-in-the-miocene-of-madagascar
#4
Michael D Gottfried, Karen E Samonds, Summer A Ostrowski, Tsiory Harimalala Andrianavalona, Tolotra Niaina Ramihangihajason
Recent exploration of Miocene-age deposits at Nosy Makamby, a small island ~50 km southwest of Mahajanga city in northwestern Madagascar, has led to the recovery of a large sample [82] of isolated barracuda teeth (Sphyraena sp.). in a tropical marine fauna that also includes diverse marine invertebrates, chondrichthyans, bony fishes, turtles, crocodylians, and sirenians. Characteristically for barracudas, the teeth are labiolingually flattened and fang-like with a broadly triangular and blade-like acuminate outline and sharply edged but unserrated cutting margins...
2017: PloS One
https://www.readbyqxmd.com/read/28542245/identifying-corals-displaying-aberrant-behavior-in-fiji-s-lau-archipelago
#5
Anderson B Mayfield, Chii-Shiarng Chen, Alexandra C Dempsey
Given the numerous threats against Earth's coral reefs, there is an urgent need to develop means of assessing reef coral health on a proactive timescale. Molecular biomarkers may prove useful in this endeavor because their expression should theoretically undergo changes prior to visible signs of health decline, such as the breakdown of the coral-dinoflagellate (genus Symbiodinium) endosymbiosis. Herein 13 molecular- and physiological-scale biomarkers spanning both eukaryotic compartments of the anthozoan-Symbiodinium mutualism were assessed across 70 pocilloporid coral colonies sampled from reefs of Fiji's easternmost province, Lau...
2017: PloS One
https://www.readbyqxmd.com/read/28533955/among-site-variability-in-the-stochastic-dynamics-of-east-african-coral-reefs
#6
Katherine A Allen, John F Bruno, Fiona Chong, Damian Clancy, Tim R McClanahan, Matthew Spencer, Kamila Żychaluk
Coral reefs are dynamic systems whose composition is highly influenced by unpredictable biotic and abiotic factors. Understanding the spatial scale at which long-term predictions of reef composition can be made will be crucial for guiding conservation efforts. Using a 22-year time series of benthic composition data from 20 reefs on the Kenyan and Tanzanian coast, we developed Bayesian vector autoregressive state-space models for reef dynamics, incorporating among-site variability, and quantified their long-term behaviour...
2017: PeerJ
https://www.readbyqxmd.com/read/28533550/coral-larvae-are-poor-swimmers-and-require-fine-scale-reef-structure-to-settle
#7
Tom Hata, Joshua S Madin, Vivian R Cumbo, Mark Denny, Joanna Figueiredo, Saki Harii, Christopher J Thomas, Andrew H Baird
Reef coral assemblages are highly dynamic and subject to repeated disturbances, which are predicted to increase in response to climate change. Consequently there is an urgent need to improve our understanding of the mechanisms underlying different recovery scenarios. Recent work has demonstrated that reef structural complexity can facilitate coral recovery, but the mechanism remains unclear. Similarly, experiments suggest that coral larvae can distinguish between the water from healthy and degraded reefs, however, whether or not they can use these cues to navigate to healthy reefs is an open question...
May 22, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28527001/the-relative-abundance-of-dimethylsulfoniopropionate-dmsp-among-other-zwitterions-in-branching-coral-at-heron-island-southern-great-barrier-reef
#8
Hilton B Swan, Elisabeth S M Deschaseaux, Graham B Jones, Bradley D Eyre
Dimethylsulfoniopropionate (DMSP) and eleven other target zwitterions were quantified in the branch tips of six Acropora species and Stylophora pistillata hard coral growing on the reef flat surrounding Heron Island in the southern Great Barrier Reef (GBR), Australia. Hydrophilic interaction liquid chromatography mass spectrometry (HILIC-MS) was used for sample analysis with isotope dilution MS applied to quantify DMSP. The concentration of DMSP was ten times greater in A. aspera than A. valida, with this difference being maintained throughout the spring, summer and winter seasons...
May 20, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28526853/response-of-coral-calcification-and-calcifying-fluid-composition-to-thermally-induced-bleaching-stress
#9
J P D'Olivo, M T McCulloch
Severe, global-scale thermal stress events like those of 1998 and 2016, are becoming more frequent and intense, potentially compromising the future of coral reefs. Here we report the effects of the 1998 bleaching event on coral calcification as well as the composition of the calcifying fluid (cf) from which corals precipitate their calcium carbonate skeletons. This was investigated by using the Sr/Ca, Li/Mg (temperature), and boron isotopes (δ(11)B) and B/Ca (carbonate chemistry) proxies in a Porites sp. coral...
May 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28526200/nickel-and-ocean-warming-affect-scleractinian-coral-growth
#10
T Biscéré, A Lorrain, R Rodolfo-Metalpa, A Gilbert, A Wright, C Devissi, C Peignon, R Farman, E Duvieilbourg, C Payri, F Houlbrèque
The sensitivity of corals and their Symbiodinium to warming has been extensively documented; however very few studies considered that anthropogenic inputs such as metal pollution have already an impact on many fringing reefs. Thus, today, nickel releases are common in coastal ecosystems. In this study, two major reef-building species Acropora muricata and Pocillopora damicornis were exposed in situ to ambient and moderate nickel concentrations on a short-term period (1h) using benthic chamber experiments. Simultaneously, we tested in laboratory conditions the combined effects of a chronic exposure (8weeks) to moderate nickel concentrations and ocean warming on A...
May 17, 2017: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/28526119/effects-of-temperature-salinity-and-composition-of-the-dinoflagellate-assemblage-on-the-growth-of-gambierdiscus-carpenteri-isolated-from-the-great-barrier-reef
#11
Leanne Sparrow, Paolo Momigliano, Garry R Russ, Kirsten Heimann
Increases in reported incidence of ciguatera fish poisoning (hereafter ciguatera) have been linked to warmer sea temperatures that are known to trigger coral bleaching events. The drivers that trigger blooms of ciguatera-causing dinoflagellates on the Great Barrier Reef (GBR) are poorly understood. This study investigated the effects of increased temperatures and lowered salinities, often associated with environmental disturbance events, on the population growth of two strains of the potentially ciguatera-causing dinoflagellate, Gambierdiscus carpenteri (NQAIF116 and NQAIF380)...
May 2017: Harmful Algae
https://www.readbyqxmd.com/read/28526118/effects-of-elevated-nutrients-and-co2-emission-scenarios-on-three-coral-reef-macroalgae
#12
Dorothea Bender-Champ, Guillermo Diaz-Pulido, Sophie Dove
Coral reef macroalgae are expected to thrive in the future under conditions that are deleterious to the health of reef-building corals. Here we examined how macroalgae would be affected by exposure to future CO2 emission scenarios (pCO2 and temperature), enriched nutrients and combinations of both. The species tested, Laurencia intricata (Rhodophyta), Turbinaria ornata and Chnoospora implexa (both Phaeophyceae), have active carbon-concentrating mechanisms but responded differently to the treatments. L. intricata showed high mortality under nutrient enriched RCP4...
May 2017: Harmful Algae
https://www.readbyqxmd.com/read/28522534/21st-century-rise-in-anthropogenic-nitrogen-deposition-on-a-remote-coral-reef
#13
Haojia Ren, Yi-Chi Chen, Xingchen T Wang, George T F Wong, Anne L Cohen, Thomas M DeCarlo, Mira A Weigand, Horng-Sheng Mii, Daniel M Sigman
With the rapid rise in pollution-associated nitrogen inputs to the western Pacific, it has been suggested that even the open ocean has been affected. In a coral core from Dongsha Atoll, a remote coral reef ecosystem, we observe a decline in the (15)N/(14)N of coral skeleton-bound organic matter, which signals increased deposition of anthropogenic atmospheric N on the open ocean and its incorporation into plankton and, in turn, the atoll corals. The first clear change occurred just before 2000 CE, decades later than predicted by other work...
May 19, 2017: Science
https://www.readbyqxmd.com/read/28515171/mutualistic-damselfish-induce-higher-photosynthetic-rates-in-their-host-coral
#14
Nur Garcia-Herrera, Sebastian C A Ferse, Andreas Kunzmann, Amatzia Genin
Coral reefs are amongst the most diverse ecosystems on Earth where complex inter-specific interactions are ubiquitous. An example of such interactions is the mutualistic relationship between damselfishes and branching corals in the Northern Red Sea, where the fish use corals as shelter and provide them with nutrients, enhance the flow between their branches, and protect them from predators. By enhancing the flow between the coral branches, the fish ventilate the coral's inner zone, mitigating hypoxic conditions that otherwise develop within that zone during the night...
May 15, 2017: Journal of Experimental Biology
https://www.readbyqxmd.com/read/28513777/population-dynamics-of-siderastrea-stellata-verrill-1868-from-rocas-atoll-rn-implications-for-predicted-climate-change-impacts-at-the-only-south-atlantic-atoll
#15
Barbara R Pinheiro, Natan S Pereira, Paula G F Agostinho, Manuel J F Montes
Coral reefs are one of the most vulnerable ecosystems to ocean warming and acidification, and it is important to determine the role of reef building species in this environment in order to obtain insight into their susceptibility to expected impacts of global changes. Aspects of the life history of a coral population, such as reproduction, growth and size-frequency can contribute to the production of models that are used to estimate impacts and potential recovery of the population, acting as a powerful tool for the conservation and management of those ecosystems...
May 15, 2017: Anais da Academia Brasileira de Ciências
https://www.readbyqxmd.com/read/28510601/reproductive-biology-of-the-deep-brooding-coral-seriatopora-hystrix-implications-for-shallow-reef-recovery
#16
Rian Prasetia, Frederic Sinniger, Kaito Hashizume, Saki Harii
Mesophotic coral ecosystems (MCEs, between 30 and 150 m depth) are hypothesized to contribute to the recovery of degraded shallow reefs through sexually produced larvae (referred to as Deep Reef Refuge Hypothesis). In Okinawa, Japan, the brooder coral Seriatopora hystrix was reported to be locally extinct in a shallow reef while it was found abundant at a MCE nearby. In this context, S. hystrix represents a key model to test the Deep Reef Refuge Hypothesis and to understand the potential contribution of mesophotic corals to shallow coral reef recovery...
2017: PloS One
https://www.readbyqxmd.com/read/28509908/microbial-contributions-to-the-persistence-of-coral-reefs
#17
Nicole S Webster, Thorsten B H Reusch
On contemplating the adaptive capacity of reef organisms to a rapidly changing environment, the microbiome offers significant and greatly unrecognised potential. Microbial symbionts contribute to the physiology, development, immunity and behaviour of their hosts, and can respond very rapidly to changing environmental conditions, providing a powerful mechanism for acclimatisation and also possibly rapid evolution of coral reef holobionts. Environmentally acquired fluctuations in the microbiome can have significant functional consequences for the holobiont phenotype upon which selection can act...
May 16, 2017: ISME Journal
https://www.readbyqxmd.com/read/28502453/petroleum-hydrocarbon-toxicity-to-corals-a-review
#18
REVIEW
Nicholas R Turner, D Abigail Renegar
The proximity of coral reefs to coastal urban areas and shipping lanes predisposes corals to petroleum pollution from multiple sources. Previous research has evaluated petroleum toxicity to coral using a variety of methodology, including monitoring effects of acute and chronic spills, in situ exposures, and ex situ exposures with both adult and larval stage corals. Variability in toxicant, bioassay conditions, species and other methodological disparities between studies prevents comprehensive conclusions regarding the toxicity of hydrocarbons to corals...
May 10, 2017: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/28489903/atoll-scale-patterns-in-coral-reef-community-structure-human-signatures-on-ulithi-atoll-micronesia
#19
Nicole L Crane, Peter Nelson, Avigdor Abelson, Kristin Precoda, John Rulmal, Giacomo Bernardi, Michelle Paddack
The dynamic relationship between reefs and the people who utilize them at a subsistence level is poorly understood. This paper characterizes atoll-scale patterns in shallow coral reef habitat and fish community structure, and correlates these with environmental characteristics and anthropogenic factors, critical to conservation efforts for the reefs and the people who depend on them. Hierarchical clustering analyses by site for benthic composition and fish community resulted in the same 3 major clusters: cluster 1-oceanic (close proximity to deep water) and uninhabited (low human impact); cluster 2-oceanic and inhabited (high human impact); and cluster 3-lagoonal (facing the inside of the lagoon) and inhabited (highest human impact)...
2017: PloS One
https://www.readbyqxmd.com/read/28486655/microbial-processes-driving-coral-reef-organic-carbon-flow
#20
Cynthia B Silveira, Giselle S Cavalcanti, Juline M Walter, Arthur W Silva-Lima, Elizabeth A Dinsdale, David G Bourne, Cristiane C Thompson, Fabiano L Thompson
Coral reefs are one of the most productive ecosystems on the planet, with primary production rates compared to that of rain forests. Benthic organisms release 10-50% of their gross organic production as mucus that stimulates heterotrophic microbial metabolism in the water column. As a result, coral reef microbes grow up to 50 times faster than open ocean communities. Anthropogenic disturbances cause once coral-dominated reefs to become dominated by fleshy organisms, with several outcomes for trophic relationships...
May 9, 2017: FEMS Microbiology Reviews
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