Emergent properties in the responses of tropical corals to recurrent climate extremes

Current Biology, Journal Year: 2021, Volume and Issue: 31(23), P. 5393 - 5399.e3

Published: Nov. 4, 2021

Language: Английский

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Increased dominance of heat-tolerant symbionts creates resilient coral reefs in near-term ocean warming

Proceedings of the National Academy of Sciences, Journal Year: 2023, Volume and Issue: 120(8)

Published: Feb. 13, 2023

Climate change is radically altering coral reef ecosystems, mainly through increasingly frequent and severe bleaching events. Yet, some reefs have exhibited higher thermal tolerance after severely the first time. To understand changes in eastern tropical Pacific (ETP), we compiled four decades of temperature, cover, bleaching, mortality data, including three mass events during 1982 to 1983, 1997 1998 2015 2016 El Niño heatwaves. Higher heat resistance later was detected dominant framework-building genus, Pocillopora, while other taxa similar susceptibility across Genetic analyses Pocillopora spp . colonies their algal symbionts (2014 2016) revealed that one two lineages present region ( “ type 1”) increased its association with thermotolerant Durusdinium glynnii ) stress event. This lineage experienced lower compared “type 3”, which did not acquire D. Under projected stress, ETP may be able preserve high cover 2060s or later, composed associate However, although low-diversity, high-cover could illustrate a potential functional state for future reefs, this only temporary unless global greenhouse gas emissions resultant warming are curtailed.

Language: Английский

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Phosphate deficiency promotes coral bleaching and is reflected by the ultrastructure of symbiotic dinoflagellates

Marine Pollution Bulletin, Journal Year: 2017, Volume and Issue: 118(1-2), P. 180 - 187

Published: Feb. 27, 2017

Enrichment of reef environments with dissolved inorganic nutrients is considered a major threat to the survival corals living in symbiosis dinoflagellates (Symbiodinium sp.). We argue, however, that direct negative effects on are not necessarily caused by nutrient enrichment itself but phosphorus starvation algal symbionts can be skewed nitrogen (N) (P) ratios. exposed imbalanced N:P ratios long-term experiments and found undersupply phosphate severely disturbed symbiosis, indicated loss coral biomass, malfunctioning photosynthesis bleaching corals. In contrast, tolerated an at high concentrations without symbiont photosynthesis, suggesting better adaptation limitation. Transmission electron microscopy analysis revealed signatures ultrastructural biomarkers represent versatile tools for classification stress symbiotic algae. Notably, water were clearly identified accumulation uric acid crystals.

Language: Английский

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Rapid Acclimation Ability Mediated by Transcriptome Changes in Reef-Building Corals

Genome Biology and Evolution, Journal Year: 2015, Volume and Issue: 7(6), P. 1602 - 1612

Published: May 15, 2015

Population response to environmental variation involves adaptation, acclimation, or both. For long-lived organisms, acclimation likely generates a faster but is only effective if the rates and limits of match dynamics local variation. In coral reef habitats, heat stress from extreme ocean warming can occur over several weeks, resulting in symbiont expulsion widespread death. However, transcriptome regulation during short-term not well understood. We examined 11-day experiment Acropora nana. acclimated colonies three regimes: ambient temperature (29 °C), increased stable (31 variable (29–33 mimicking conditions. Within 7–11 days, individuals temperatures had higher tolerance acute stress. Despite physiological changes, no gene expression changes occurred before we found strikingly different transcriptional responses between treatments across 893 contigs. Across these contigs, corals °C 29–33 °C) exhibited muted response—the magnitude change after was less than 29 corals. Our results show that have rapid phase substantially increases their resilience within 7 days alters This addition previously observed longer term response, distinguishable by its shift baseline expression, under nonstressful Such may provide some protection for this species against slow onset temperatures.

Language: Английский

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Transgenerational acclimation of fishes to climate change and ocean acidification

F1000Prime Reports, Journal Year: 2014, Volume and Issue: 6

Published: Nov. 4, 2014

There is growing concern about the impacts of climate change and ocean acidification on marine organisms ecosystems, yet potential for acclimation adaptation to these threats poorly understood. Whereas many short-term experiments report negative biological effects warming acidification, new studies show that some species have capacity acclimate warmer more acidic environments across generations. Consequently, transgenerational plasticity may be a powerful mechanism by which populations will able adjust projected change. Here, I review recent advances in understanding fishes. Research over past 2 3 years shows can partially or fully ameliorate warming, hypoxia range different species. The molecular cellular pathways underpinning are currently unknown, but modern genetic methods provide tools explore mechanisms. Despite benefits acclimation, there could limitations phenotypic traits respond transgenerationally, trade-offs between life stages, need investigated. Future should also test interactions evolution determine how two processes shape adaptive responses environmental coming decades.

Language: Английский

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