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21 results for “coral resistance”
Datasets associated with Agostini, S., Houlbreque, F., Biscéré, T., Harvey, B. P., Heitzman, J. M., Takimoto, R., et al. (2020). Greater mitochondrial energy production provides resistance to ocean acidification in 'winning' hermatypic corals. Front. Mar. Sci. 7. doi:10.3389/fmars.2020.600836.
<p>Datasets associated with Agostini, S., Houlbreque, F., Biscéré, T., Harvey, B. P., Heitzman, J. M., Takimoto, R., et al. (2020). Greater mitochondrial energy production provides resistance to ocean acidification in ‘winning’ hermatypic corals. Front. Mar. Sci. 7. doi:10.3389/fmars.2020.600836.</p>
Higher thermal resistance of corals in the global marine biodiversity center
<p><span>Predictions for the future of coral reef are largely based on thermal exposure and poorly account for geographic variation in biological sensitivity and resistance to thermal stress. Based on the ratio of thermal exposure and sensitivity, geographic variability of coral resistance was estimated during the 2016 global-bleaching event. Exposure was estimated as historical cumulative excess summer heat (CTA) and a multivariate index of SST, light, and water flow (CE). Site sensitivity was estimated for 226 sites using coordinated bleaching observations. Site resistance was evaluated by 128 possible models for the influences of geography, historical SST variation, coral cover, and number of coral genera. Most factors were statistically significant but the strongest factor was geography - Coral Triangle having higher resistance than non-Coral Triangle sites. Consequently, future predictions of thermal stress will need to account for strong geographic differences in acclimation/adaptation. </span></p>
Positive interactions between corals and damselfish increase coral resistance to temperature stress
<p>By the century's end, many tropical seas will reach temperatures exceeding most coral species' thermal tolerance on an annual basis. The persistence of corals in these regions will therefore depend on their abilities to tolerate recurrent thermal stress. Although ecologists have long recognized that positive interspecific interactions can ameliorate environmental stress to expand the realized niche of plants and animals, coral bleaching studies have largely overlooked how interactions with community members outside of the coral holobiont shape the bleaching response. Here, we subjected a common coral, <em>Pocillopora</em> <em>grandis</em>, to 10 days of thermal stress in aquaria with- and without the damselfish <em>Dascyllus</em> <em>flavicaudus</em> (yellowtail dascyllus), which commonly shelter within these corals, to examine how interactions with damselfish impacted coral thermal tolerance. Corals often benefit from nutrients excreted by animals they interact with and prior to thermal stress, corals grown with damselfish showed improved photophysiology (F<sub>v</sub>/F<sub>m</sub>) and developed larger endosymbiont populations. When exposed to thermal stress, corals with fish performed as well as corals maintained at ambient temperatures without fish. In contrast, corals exposed to thermal stress without fish experienced photophysiological impairment, a more than 50% decline in endosymbiont density, and a 36% decrease in tissue protein content. By the end of the experiment, thermal stress caused average calcification rates to decrease by over 80% when damselfish were absent but increase nearly 25% when damselfish were present. Our study indicates that damselfish-derived nutrients can increase coral thermal tolerance and are consistent with the Stress Gradient Hypothesis, which predicts that positive interactions become increasingly important for structuring communities as environmental stress increases. Because warming of just a few degrees can exceed corals' temperature tolerance to trigger bleaching and mortality, positive interactions could play a critical role in maintaining some coral species in warming regions until climate change is aggressively addressed.</p>
Coral resistance to ocean acidification linked to increased calcium at the site of calcification
<p>This file contains all the data and code for "Coral resistance to ocean acidification linked to increased calcium at the site of calcification" by DeCarlo et al. in Proceedings of the Royal Society B. Run the file, "run.R" in R to reproduce the analysis and create all the figures.</p> <p>Please see the published paper for methods and details: http://rspb.royalsocietypublishing.org/lookup/doi/10.1098/rspb.2018.0564</p>
Natural temperature variation at the origin site can determine coral resistance to thermal stress
<p>This repository contains data files and scripts used in the research paper titled <em>"Natural temperature variation at the origin site can determine coral resistance to thermal stress."</em> The provided materials support the analysis and results presented in the study.</p>
Genomic Signatures of Disease Resistance in Endangered Staghorn Corals
<p>White Band Disease (WBD) has caused unprecedented declines in the Caribbean <em>Acropora</em> corals, which are now listed as critically endangered species. Highly disease resistant <em>Acropora</em> <em> cervicornis</em> genotypes exist, but we lack understanding of the genetic underpinnings of disease resistance. Using transmission experiments, a newly assembled genome, and whole genome resequencing of 76 <em>A. cervicornis</em> genotypes from Florida and Panama, we identified ten genomic regions and 73 single-nucleotide polymorphisms (SNPs) that are strongly associated with disease resistance and that include functional, protein coding changes in four genes involved in coral immunity and pathogen detection. Polygenic scores calculated from 10 genomic loci indicate that simple genetic screens can predict <em>A. cervicornis</em> disease resistance and that adaptive polygenic variation can be used to improve disease resistance in wild and nursery stocks of <em>A. cervicornis</em> across the Caribbean.</p>
Algal symbiont diversity in Acropora muricata from the extreme reef of Bouraké associated with resistance to coral bleaching
<p>Widespread coral bleaching has generally been linked to high water temperatures at larger geographic scale. However, teh bleaching response can be highly variable aming individuals of the same species, between different species, and across localities; what causes this variability remais unresolved. Here, we tracked bleached and non-bleached colonies of <em>Acropora muricata </em>to see if they recovered or died following a stress event inside the semi-enclosed lagoon of Bouraké (New Caledonia), where corals are long-term acclimatized to extreme conditions of temperature, pH and dissolved oxygen, and at a nearby control reef. We describe Symbiodiniaceae community changes, metabolic responses, and energetical reserves (12 physiological traits evaluated) during La Niña warm and rainy summer in 2021. Widespread coral bleaching (score 1 and 2 on coral colour health chart) was observed only in Bouraké, likely due to the combination of the high temperatures (up to 32 <sup>o</sup>C) and heavy rain. All colonies (i.e., Bouraké and reference site) had <em>Cladocopium </em> as their main genera. Unbleached colonies in Bouraké had a specific ITS2-type profile (proxies for Symbiodiniaceae genotypes), while the bleached colonies in Bouraké had the same ITS2-type profile of control colonies during the stress event. After four months, teh few bleached colonies thata survived acquired the same ITS2 type profiles of the unbleached resistant colonies. In terms of physiological performances, all bleached corals showed metabolic depression (e.g., P<sub>gross </sub>and R<sub>dark</sub>). In contrast, unbleahed colonies in Bouraké maintained higher metabolic rates and energetic reserves compared to control corals. Our study suggests that <em>Acropora muricata</em> enhanced their resistance to bleaching thanks to specific Symbiodiniaceae, while energetic reserves may increase their resilience after stress. </p>
Algal symbiont diversity in Acropora muricata from the extreme reef of Bouraké associated with resistance to coral bleaching
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Higher thermal resistance of corals in the global marine biodiversity center
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Data from: Deep oxygen-depleted Red Sea coral reef depressions sustain resistant ecosystems
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Positive interactions between corals and damselfish increase coral resistance to temperature stress
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Raman data for "Resistance to ocean acidification in coral reef taxa is not gained by acclimatization"
<p>This file contains the Raman data and code for "Resistance to ocean acidification in coral reef taxa is not gained by acclimatization" by Comeau et al. in Nature Climate Change. Run the file, "run.R" in R to reproduce the analysis.</p> <p>Please see the published paper for methods and details: https://doi.org/10.1038/s41558-019-0486-9</p>
Raman data for "Resistance of corals and coralline algae to ocean acidification: physiological control of calcification under natural pH variability"
<p>This file contains the Raman data and code for "Resistance of corals and coralline algae to ocean acidification: physiological control of calcification under natural pH variability" by Cornwall et al. in Proceedings of the Royal Society B. Run the file, "run.R" in R to reproduce the analysis.</p> <p>Please see the published paper for methods and details: <a href="https://doi.org/10.1098/rspb.2018.1168">https://doi.org/10.1098/rspb.2018.1168</a></p>
Data from: The role of transcriptome resilience in resistance of corals to bleaching
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Extra high superoxide dismutase in host tissue upgrades bleaching resistance in the “thermal adapted” and Durusdinium trenchii-associating coral
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Data from: Resistance of corals and coralline algae to ocean acidification: physiological control of calcification under natural pH variability
Ocean acidification is a threat to the continued accretion of coral reefs, though some undergo daily fluctuations in pH exceeding declines predicted by 2100. We test whether exposure to greater pH variability enhances resistance to ocean acidification for the coral Goniopora sp. and coralline alga Hydrolithon reinboldii from two sites: one with low pH variability (< 0.15 units daily; Shell Island), and a site with high pH variability (up to 1.4 pH units daily; Tallon Island). We grew populations of both species for >100 days under a combination of differing pH variability (high/low) and means (ambient pH 8.05/ocean acidification pH 7.65). Calcification rates of Goniopora sp. were unaffected by the examined variables. Calcification rates of H. reinboldii were significantly faster in Tallon than Shell Island individuals, and Tallon Island individuals calcified faster in the high variability pH 8.05 treatment compared to all others. Geochemical proxies for carbonate chemistry within the calcifying fluid (cf) of both species indicated that only mean seawater pH influenced pHcf. pH treatments had no effect on proxies for Ωcf. These limited responses to extreme pH treatments demonstrates some calcifying taxa may be capable of maintaining constant rates of calcification under ocean acidification by actively modifying Ωcf.
Data from: Isolation by resistance across a complex coral reef seascape
A detailed understanding of the genetic structure of populations and an accurate interpretation of processes driving contemporary patterns of gene flow are fundamental to successful spatial conservation management. The field of seascape genetics seeks to incorporate environmental variables and processes into analyses of population genetic data to improve our understanding of forces driving genetic divergence in the marine environment. Information about barriers to gene flow (such as ocean currents) is used to define a resistance surface to predict the spatial genetic structure of populations and explain deviations from the widely applied isolation-by-distance model. The majority of seascape approaches to date have been applied to linear coastal systems or at large spatial scales (more than 250 km), with very few applied to complex systems at regional spatial scales (less than 100 km). Here, we apply a seascape genetics approach to a peripheral population of the broadcast-spawning coral Acropora spicifera across the Houtman Abrolhos Islands, a high-latitude complex coral reef system off the central coast of Western Australia. We coupled population genetic data from a panel of microsatellite DNA markers with a biophysical dispersal model to test whether oceanographic processes could explain patterns of genetic divergence. We identified significant variation in allele frequencies over distances of less than 10 km, with significant differentiation occurring between adjacent sites but not between the most geographically distant ones. Recruitment probabilities between sites based on simulated larval dispersal were projected into a measure of resistance to connectivity that was significantly correlated with patterns of genetic divergence, demonstrating that patterns of spatial genetic structure are a function of restrictions to gene flow imposed by oceanographic currents. This study advances our understanding of the role of larval dispersal on the fine-scale genetic structure of coral populations across a complex island system and applies a methodological framework that can be tailored to suit a variety of marine organisms with a range of life-history characteristics.
Data from: Resistance of corals and coralline algae to ocean acidification: physiological control of calcification under natural pH variability
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Data from: Isolation by resistance across a complex coral reef seascape
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Differential resistance and acclimation of two coral species to chronic nutrient enrichment reflect life history traits
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