High coral heat tolerance at local-scale thermal refugia

PLOS Climate, Год журнала: 2024, Номер 3(7), С. e0000453 - e0000453

Опубликована: Июль 11, 2024

Marine heatwaves and mass bleaching have devastated coral populations globally, yet severity often varies among reefs. To what extent a reef’s past exposure to heat stress influences mortality remains uncertain. Here we identify persistent local-scale hotspots thermal refugia the reefs of Palau, Micronesia, based on 36 years satellite-derived cumulative (degree heating weeks–DHW, units: °C-weeks). One possibility is that may harbour more tolerant corals due acclimatisation, directional selection, and/or loss genotypes. Historic patterns assemblage-wide marine align with this hypothesis, DHW-bleaching responses occurring at 1.7°C-weeks greater than refugia. This trend was consistent weaker for Acropora corymbose , severe risk reduced by 4–10% hotspots. However, find contrasting pattern digitifera exposed simulated heatwave. Fragments 174 colonies were collected from replicate hotspot refugium outer comparable wave depth. Higher tolerance (+0.7°C-weeks) correlation tissue biomass suggests factors other DHW overwhelm any spatially varying effects exposure. Further, found considerable A . variability across sites; compared least-tolerant 10% colonies, most-tolerant could withstand additional stresses 5.2 4.1°C-weeks hotspots, respectively. Our study demonstrates do not necessarily nearby refugia, predict species responses. nuance has important implications designing climate-smart initiatives; instance, in search corals, our results suggest investing effort into identifying most within individual be warranted.

Язык: Английский

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Some reef-building corals only disperse metres per generation

Proceedings of the Royal Society B Biological Sciences, Год журнала: 2024, Номер 291(2027)

Опубликована: Июль 1, 2024

Understanding the dispersal potential of different species is essential for predicting recovery trajectories following local disturbances and adaptive loci to spread populations facing extreme environmental changes. However, distances have been notoriously difficult estimate scleractinian corals, where sexually (as gametes or larvae) asexually fragments derived propagules disperse through vast oceans. Here, we demonstrate that generational produced can be indirectly inferred corals using individual-based isolation-by-distance (IbD) analyses by combining reduced-representation genomic sequencing with photogrammetric spatial mapping. Colonies from genus Agaricia were densely sampled across plots at four locations three depths in Curaçao. Seven cryptic taxa found among nominal ( agaricites , humilis lamarcki ), showing within metres (two A. two ). no signals IbD thus these probably relatively longer distances. The short estimated here imply are reliant on highly localized replenishment need quantitatively more coral species.

Язык: Английский

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Chromosome-level genome assemblies and genetic maps reveal heterochiasmy and macrosynteny in endangered Atlantic Acropora

BMC Genomics, Год журнала: 2024, Номер 25(1)

Опубликована: Ноя. 20, 2024

Abstract Background Over their evolutionary history, corals have adapted to sea level rise and increasing ocean temperatures, however, it is unclear how quickly they may respond rapid change. Genome structure genetic diversity contained within highlight adaptive potential. Results We present chromosome-scale genome assemblies linkage maps of the critically endangered Atlantic acroporids, Acropora palmata A. cervicornis . Both were resolved into 14 chromosomes with gene content colinearity. Repeats chromosome arrangements largely preserved between species. The family Acroporidae genus exhibited many phylogenetically significant expansions. Macrosynteny decreased phylogenetic distance. Nevertheless, scleractinians shared six 21 cnidarian ancestral groups as well numerous fission fusion events compared other distantly related cnidarians. Genetic constructed from one 16 families using a genotyping array. consensus span 1,013.42 cM 927.36 for , respectively. species high genome-wide recombination rates (3.04 3.53 cM/Mb) pronounced sex-based differences, known heterochiasmy, 2 2.5X higher estimated in female maps. Conclusions Together, we here are first detailed look at genomic landscapes acroporids. These data sets revealed that capacity acroporids not limited by rates. sister maintain macrosynteny few genes sequence divergence act reproductive barriers them. In hybridization two yields an F1 hybrid fertility despite levels colinearity genomes. these resources now enable association studies discovery quantitative trait loci, tools can aid conservation

Язык: Английский

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Learning from the past is not enough to survive present and future bleaching threshold temperatures

The Science of The Total Environment, Год журнала: 2022, Номер 852, С. 158379 - 158379

Опубликована: Авг. 31, 2022

Язык: Английский

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Chromosomal inversions harbour excess mutational load in the coral, Acropora kenti, on the Great Barrier Reef

Molecular Ecology, Год журнала: 2024, Номер 33(16)

Опубликована: Июль 24, 2024

The future survival of coral reefs in the Anthropocene depends on capacity corals to adapt as oceans warm and extreme weather events become more frequent. Targeted interventions designed assist evolutionary processes require a comprehensive understanding distribution structure standing variation, however, efforts map genomic variation have so far focussed almost exclusively SNPs, overlooking structural variants that been shown drive adaptive other taxa. Here, we show reef-building coral, Acropora kenti, harbours at least five large, highly polymorphic variants, all which exhibit signatures strongly suppressed recombination heterokaryotypes, feature commonly associated with chromosomal inversions. Based their high minor allele frequency, uniform across habitats elevated genetic load, propose these inversions A. kenti are likely be under balancing selection. An excess SNPs impact protein-coding genes within loci elevates importance both potential targets for selection contributors decline if populations fragmented or inbred future.

Язык: Английский

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Higher spatial resolution is not always better: evaluating satellite-sensed sea surface temperature products for a west Pacific coral reef system

Scientific Reports, Год журнала: 2025, Номер 15(1)

Опубликована: Янв. 8, 2025

Abstract As marine heatwaves and mass coral bleaching events rise in frequency severity, there is an increasing need for high-resolution satellite products that accurately predict reef thermal environments over large spatio-temporal scales. Deciding which global sea surface temperature (SST) dataset to use research or management depends part on the desired spatial resolution. Here, we evaluate two SST datasets – lower-resolution CoralTemp v3.1 (0.05° ~ 5 km grid) Multiscale Ultra-high Resolution MUR v4.1 (0.01° 1 their ability situ (nightly mean daily maximum) severity of past Palau, western Pacific Ocean. We expected higher-resolution data improve prediction accuracy, yet explained 10% additional variability temperatures 70% variance bleaching. This likely relates differential protocols; despite using a higher resolution grid, achieves raw observation density coastal areas by utilising geostationary satellites. SSTs were also consistently more variable. These results reinforce calls develop accurate reefs. Our paper demonstrates not necessarily better at predicting reefs local heatwave impacts.

Язык: Английский

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Slight thermal stress exerts genetic diversity selection at coral (Acropora digitifera) larval stages

BMC Genomics, Год журнала: 2025, Номер 26(1)

Опубликована: Янв. 14, 2025

Abstract Background Rising seawater temperatures increasingly threaten coral reefs. The ability of larvae to withstand heat is crucial for maintaining reef ecosystems. Although several studies have investigated larvae’s genetic responses thermal stress, most relied on pooled sample sequencing, which provides population-level insights but may mask individual genotype variability. This study uses larval sequencing investigate genotype-specific stress and the selective pressures shaping their genomes, offering finer resolution deeper insights. Results investigates response before acquiring symbiotic algae, aiming elucidate relationship between diversity stress. Larvae sourced from eight Acropora digitifera colonies were subjected ambient temperature (28 °C) conditions (31 °C). impact was assessed through sequencing. While overall diversity, represented by π, did not significantly differ control heat-exposed groups, Tajima’s D differed, indicating different in each group. genomic regions under higher lower broadly shared among head conditions, implying that operated distinctive manners. Many protein-coding sequences identified this region, codon evolution many these genes showed signs positive selection. These results highlight complex temperatures. showing selection also been influenced historical fluctuations, as suggested association with loci during Acroporid speciation. codon-level speciation potential role adaptation environmental changes over evolutionary timescales. Conclusion findings underscore significance reproduction They indicate even minor can exert significant pressure, potentially leading profound implications research understanding rising

Язык: Английский

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Fine resolution satellite sea surface temperatures capture the conditions experienced by corals at monthly but not daily timescales

Coral Reefs, Год журнала: 2025, Номер unknown

Опубликована: Янв. 16, 2025

Abstract Water temperature is a strong driver of growth, survival, and local adaptation in corals, but our knowledge the temperatures experienced by corals on reefs worldwide remains limited. While situ loggers can provide high quality data, they are relatively expensive to place retrieve. Alternatively, remotely sensed sea surface data globally available may be biased representation corals. Here, we compared from 314 coral ~ 1 km 2 resolution Multi-scale Ultra-high Resolution Sea Surface Temperature (MUR) product NASA. We found good agreement (Pearson’s r = 0.95) between maximum monthly mean calculated remote with 84% within 0.5 °C each other. However, did not effectively capture sub-diel fluctuations highest peak that most dangerous for Predictions were significantly weakly improved consideration reef geomorphology. Ultimately, accurately represent conditions should used caution at finer temporal scales.

Язык: Английский

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Population Genomics Reveals Local Adaptation Related to Temperature Variation in Two Stream Frog Species: Implications for Vulnerability to Climate Warming

Molecular Ecology, Год журнала: 2025, Номер unknown

Опубликована: Янв. 17, 2025

ABSTRACT Identifying populations at highest risk from climate change is a critical component of conservation efforts. However, vulnerability assessments are usually applied the species level, even though intraspecific variation in exposure, sensitivity and adaptive capacity play crucial role determining vulnerability. Genomic data can inform by identifying signatures local adaptation that reflect population‐level capacity. Here, we address question to temperature genetic basis thermal tolerance two stream frogs ( Ascaphus truei A. montanus ). Building on previous physiological data, used whole‐genome resequencing tadpoles four sites spanning gradients each test for adaptation. To support these analyses, developed first annotated reference genome . We then expanded geographic scope our analysis using targeted capture an additional 11 per species. found evidence based genomic , suggesting similar levels (i.e., susceptibility) among regardless temperature. invariant tolerances across temperatures suggest occupying warmer streams may be most sensitive. identified high evolutionary potential both data. While further integration needed comprehensively evaluate spatial vulnerability, this work illustrates value genomics patterns

Язык: Английский

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Rapid Evolution in Action: Environmental Filtering Supports Coral Adaptation to a Hot, Acidic, and Deoxygenated Extreme Habitat

Global Change Biology, Год журнала: 2025, Номер 31(3)

Опубликована: Март 1, 2025

The semienclosed Bouraké lagoon in New Caledonia is a natural system that enables observation of evolution action with respect to stress tolerance marine organisms, topic directly relevant understanding the consequences global climate change. Corals inhabiting endure extreme conditions elevated temperature (> 33°C), acidification (7.2 pH units), and deoxygenation (2.28 mg O2 L-1), which fluctuate tide due lagoon's geomorphology. To investigate underlying bases apparent these corals, we combined whole genome resequencing coral host ITS2 metabarcoding photosymbionts from 90 Acropora tenuis colonies three localities along steep environmental gradient two nearby control reefs. Our results highlight importance flexibility associate different facilitating holobiont; but, perhaps more significantly, strong selective effects were detected at specific loci genome. Fifty-seven genes contained SNPs highly associated environment enriched functions related sphingolipid metabolism. Within genes, conserved sensor noxious stimuli TRPA1 ABCC4 transporter stood out high number environmentally selected they contained. Protein 3D structure predictions suggest single-point mutation causes rotation main regulatory domain TRPA1, may be behind this case selection through filtering. While corals provide striking example rapid adaptation conditions, overall, our need preserve current standing genetic variation populations safeguard their adaptive potential ongoing

Язык: Английский

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