Cophylogeny and specificity between cryptic coral species (Pocillopora spp.) at Mo′orea and their symbionts (Symbiodiniaceae)

Molecular Ecology, Journal Year: 2022, Volume and Issue: 31(20), P. 5368 - 5385

Published: Aug. 12, 2022

Abstract The congruence between phylogenies of tightly associated groups organisms (cophylogeny) reflects evolutionary links ecologically important interactions. However, despite being a classic example an obligate symbiosis, tests cophylogeny scleractinian corals and their photosynthetic algal symbionts have been hampered in the past because both algae contain genetically unresolved morphologically cryptic species. Here, we studied co‐occurring, Pocillopora species from Mo′orea, French Polynesia, that differ relative abundance across depth. We constructed new host (using complete mitochondrial genomes, genomic loci, thousands single nucleotide polymorphisms) Symbiodiniaceae ITS2 psbA ncr markers) tested for cophylogeny. analysis supported presence five on fore reef at Mo′orea mostly hosted either Cladocopium latusorum or C. pacificum. Only hosting also taxa Symbiodinium Durusdinium . In general, phylogeny mirrored phylogeny. Within species, lineages differed associations with haplotypes, except those showing evidence nuclear introgression, depth two most common found (haplotype 10), has so far only sampled warrants formal identification. linked these suggest symbiont speciation is driven by niche diversification host, but there still flexibility some cases.

Language: Английский

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Cryptic diversity and spatial genetic variation in the coral Acropora tenuis and its endosymbionts across the Great Barrier Reef

Evolutionary Applications, Journal Year: 2022, Volume and Issue: 16(2), P. 293 - 310

Published: June 20, 2022

Genomic studies are uncovering extensive cryptic diversity within reef-building corals, suggesting that evolutionarily and ecologically relevant is highly underestimated in the very organisms structure coral reefs. Furthermore, endosymbiotic algae host species can confer adaptive responses to environmental stress may represent additional axes of genetic variation not constrained by taxonomic divergence cnidarian host. Here, we examine a common widespread, coral, Acropora tenuis, its associated along entire expanse Great Barrier Reef (GBR). We use SNPs derived from genome-wide sequencing characterize organelles zooxanthellate endosymbionts (genus Cladocopium). discover three distinct sympatric clusters hosts, whose distributions appear with latitude inshore-offshore reef position. Demographic modelling suggests history taxa ranges 0.5 1.5 million years ago, preceding GBR's formation, has been characterized low-to-moderate ongoing inter-taxon gene flow, consistent occasional hybridization introgression typifying evolution. Despite this differentiation host, A. tenuis share symbiont pool, dominated genus Cladocopium (Clade C). plastid strongly identity but varies location relative shore: inshore colonies contain lower on average have greater differences between as compared communities offshore colonies. Spatial patterns could reflect local selective pressures maintaining holobiont across an gradient. The strong influence environment (but identity) community composition supports notion responds habitat assist adaptation corals future change.

Language: Английский

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Niche differences in co-occurring cryptic coral species (Pocillopora spp.)

Coral Reefs, Journal Year: 2021, Volume and Issue: 41(3), P. 767 - 778

Published: May 13, 2021

Language: Английский

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Coral taxonomy and local stressors drive bleaching prevalence across the Hawaiian Archipelago in 2019

PLoS ONE, Journal Year: 2022, Volume and Issue: 17(9), P. e0269068 - e0269068

Published: Sept. 1, 2022

The Hawaiian Archipelago experienced a moderate bleaching event in 2019—the third major over 6-year period to impact the islands. In response, Hawai‘i Coral Bleaching Collaborative (HCBC) conducted 2,177 coral surveys across Archipelago. HCBC was established coordinate monitoring efforts state between academic institutions, non-governmental organizations, and governmental agencies facilitate data sharing provide management recommendations. 2019, goals of this unique partnership were to: 1) assess spatial temporal patterns thermal stress; 2) examine taxa-level susceptibility; 3) quantify variation extent; 4) compare 2019 those prior events; 5) identify predictors 2019; 6) explore site-specific strategies mitigate future events. Both acute stress less severe overall compared last marine heatwave events 2014 2015. observed highly site- taxon-specific, driven by susceptibility remaining assemblages whose structure likely shaped previous subsequent mortality. A suite environmental anthropogenic significantly correlated with 2019. Acute stressors, such as temperature surface light, equally important conditions (e.g. historical bleaching) accounting for during event. We found little evidence acclimation reefs main Islands. Moreover, our findings illustrate how detrimental effects local tourism urban run-off, may be exacerbated under high stress. light forecasted increase severity frequency events, mitigation both global stressors is priority corals Hawai‘i.

Language: Английский

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Divergent bleaching and recovery trajectories in reef-building corals following a decade of successive marine heatwaves

Proceedings of the National Academy of Sciences, Journal Year: 2023, Volume and Issue: 120(52)

Published: Dec. 19, 2023

Increasingly frequent marine heatwaves are devastating coral reefs. Corals that survive these extreme events must rapidly recover if they to withstand subsequent events, and long-term survival in the face of rising ocean temperatures may hinge on recovery capacity acclimatory gains heat tolerance over an individual’s lifespan. To better understand trajectories successive heatwaves, we monitored responses bleaching-susceptible bleaching-resistant individuals two dominant species Hawai’i, Montipora capitata Porites compressa , a decade included three heatwaves. Bleaching-susceptible colonies P. exhibited beneficial acclimatization stress (i.e., less bleaching) following repeat becoming indistinguishable from conspecifics during third heatwave. In contrast, M. repeatedly bleached all seasonal bleaching substantial mortality for up 3 y Encouragingly, both remained pigmented across entire time series; however, pigmentation did not necessarily indicate physiological resilience. Specifically, displayed incremental yet only partial symbiont density tissue biomass phenotypes 35 mo heatwave as well considerable mortality. Conversely, appeared most metrics within 2 experienced little no Ultimately, results even some visually robust, corals can carry cost recurring multiple years, leading divergent erode reef resilience Anthropocene.

Language: Английский

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Coral Reef Population Genomics in an Age of Global Change

Annual Review of Genetics, Journal Year: 2023, Volume and Issue: 57(1), P. 87 - 115

Published: June 29, 2023

Coral reefs are both exceptionally biodiverse and threatened by climate change other human activities. Here, we review population genomic processes in coral reef taxa their importance for understanding responses to global change. Many on characterized weak genetic drift, extensive gene flow, strong selection from complex biotic abiotic environments, which together present a fascinating test of microevolutionary theory. Selection, hybridization have played will continue play an important role the adaptation or extinction face rapid environmental change, but research remains limited compared urgent needs. Critical areas future investigation include evolutionary potential mechanisms local adaptation, developing historical baselines, building greater capacity countries where most diversity is concentrated.

Language: Английский

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Cryptic species and hybridisation in corals: challenges and opportunities for conservation and restoration

Published: Feb. 14, 2024

Conservation and management of coral reef ecosystems will depend on accurate assessments reef-building species diversity. However, the true diversity corals may be obfuscated by presence cryptic species, which are likely much more pervasive than is currently recognised. Additionally, sometimes hybridize, resulting in gene introgression between species. Here, we investigate prevalence via a structured literature review find that over 50% population genomic studies show evidence for divisions within taxonomically recognised such closely-related taxa often linked flow. We frequently segregate environment, especially depth, differ phenotypic characteristics including resilience to heat stress. This hidden biodiversity creates challenges conservation restoration planning not well appreciated, hiding declines, biasing estimates species’ breadth, overestimating stressors, yielding uncertainty evolutionary dynamics inferred from past studies, creating reproductive barriers limit mating local translocated corals. Increasing awareness with incomplete boundaries common building this expectation into plans an important pathway forward. Rich opportunities interdisciplinary collaboration among speciation biologists could fill key knowledge gaps relevant conservation. detail recommendations best practice strategies identifying hybrids urge their consideration all future

Language: Английский

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Early post-settlement events, rather than settlement, drive recruitment and coral recovery at Moorea, French Polynesia

Oecologia, Journal Year: 2024, Volume and Issue: 204(3), P. 625 - 640

Published: Feb. 28, 2024

Language: Английский

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Viruses of a key coral symbiont exhibit temperature-driven productivity across a reefscape

ISME Communications, Journal Year: 2023, Volume and Issue: 3(1)

Published: April 3, 2023

Abstract Viruses can affect coral health by infecting their symbiotic dinoflagellate partners (Symbiodiniaceae). Yet, viral dynamics in colonies exposed to environmental stress have not been studied at the reef scale, particularly within individual lineages. We sequenced major capsid protein (mcp) gene of positive-sense single-stranded RNA viruses known infect dinoflagellates (‘dinoRNAVs’) analyze reef-building coral, Porites lobata. repeatedly sampled 54 harboring Cladocopium C15 dinoflagellates, across three environmentally distinct zones (fringing reef, back and forereef) around island Moorea, French Polynesia over a 3-year period spanning reef-wide thermal event. By end sampling period, 28% (5/18) corals fringing experienced partial mortality versus 78% (14/18) forereef. Over 90% (50/54) had detectable dinoRNAV infections. Reef zone influenced composition richness mcp amino acid types (‘aminotypes’), with containing highest aminotype richness. The event significantly increased dispersion, this pattern was strongest that mortality. These findings demonstrate infections respond fluctuations situ on reefs. Further, productivity will likely increase as ocean temperatures continue rise, potentially impacting foundational symbiosis underpinning ecosystems.

Language: Английский

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Local habitat heterogeneity rivals regional differences in coral thermal tolerance

Coral Reefs, Journal Year: 2024, Volume and Issue: 43(3), P. 571 - 585

Published: April 3, 2024

Abstract Variable temperature regimes that expose corals to sublethal heat stress have been recognized as a mechanism increase coral thermal tolerance and lessen bleaching. However, there is need better understand which maximize hardening. Here, standardized assays were used determine the relative of three divergent genera ( Acropora , Pocillopora Porites ) originating from six reef sites representing an increasing gradient annual mean diel fluctuations 1–3 °C day −1 . Bleaching severity dark-acclimated photochemical yield (i.e., F v / m quantified following exposure five treatments ranging 23.0 36.3 °C. The greatest effective dose 50) was found at site with intermediate variability (2.2 ), suggesting optimal priming leads maximal tolerance. Interestingly, least thermally variable (< 1.3 had lower than most (> 2.8 whereas opposite true for responses across taxa. Remarkably, comparisons global studies revealed range in uncovered this study single 5 km) large differences observed vast latitudinal gradients (300–900 km). This finding indicates local gene flow could improve between habitats. climate change continues, intensifying marine heatwaves already compromising enhance bleaching resistance.

Language: Английский

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