Leiva C., Torda G., Zhou C. R., Pan Y. R., Harris J., Xiang X. Y., Tan S. J., Tian W., Hume B., Miller D. J., Li Q. Y., Zhang G. J., Cooke I., Rodolfo-Metalpa Riccardo. (2025). Rapid evolution in action : environmental filtering supports coral adaptation to a hot, acidic, and deoxygenated extreme habitat. Global Change Biology, 31 (3), p. e70103 [16 p.]. ISSN 1354-1013.
Titre du document
Rapid evolution in action : environmental filtering supports coral adaptation to a hot, acidic, and deoxygenated extreme habitat
Année de publication
2025
Auteurs
Leiva C., Torda G., Zhou C. R., Pan Y. R., Harris J., Xiang X. Y., Tan S. J., Tian W., Hume B., Miller D. J., Li Q. Y., Zhang G. J., Cooke I., Rodolfo-Metalpa Riccardo
Source
Global Change Biology, 2025,
31 (3), p. e70103 [16 p.] ISSN 1354-1013
The semienclosed Bourake lagoon in New Caledonia is a natural system that enables observation of evolution in action with respect to stress tolerance in marine organisms, a topic directly relevant to understanding the consequences of global climate change. Corals inhabiting the Bourake lagoon endure extreme conditions of elevated temperature (> 33 degrees C), acidification (7.2 pH units), and deoxygenation (2.28 mg O2 L-1), which fluctuate with the tide due to the lagoon's geomorphology. To investigate the underlying bases of the apparent stress tolerance of these corals, we combined whole genome resequencing of the coral host and ITS2 metabarcoding of the photosymbionts from 90 Acropora tenuis colonies from three localities along the steep environmental gradient from Bourake to two nearby control reefs. Our results highlight the importance of coral flexibility to associate with different photosymbionts in facilitating stress tolerance of the holobiont; but, perhaps more significantly, strong selective effects were detected at specific loci in the host genome. Fifty-seven genes contained SNPs highly associated with the extreme environment of Bourake and were enriched in functions related to sphingolipid metabolism. Within these genes, the conserved sensor of noxious stimuli TRPA1 and the ABCC4 transporter stood out due to the high number of environmentally selected SNPs that they contained. Protein 3D structure predictions suggest that a single-point mutation causes the rotation of the main regulatory domain of TRPA1, which may be behind this case of natural selection through environmental filtering. While the corals of the Bourake lagoon provide a striking example of rapid adaptation to extreme conditions, overall, our results highlight the need to preserve the current standing genetic variation of coral populations to safeguard their adaptive potential to ongoing rapid environmental change.
Plan de classement
Sciences du milieu [021]
;
Limnologie biologique / Océanographie biologique [034]
;
Etudes, transformation, conservation du milieu naturel [082]
Description Géographique
NOUVELLE CALDONIE ; BOURAKE LAGON
Localisation
Fonds IRD [F B010092878]
Identifiant IRD
fdi:010092878
