Rapid physiological and transcriptomic changes associated with oxygen delivery in larval anemonefish suggest a role in adaptation to life on hypoxic coral reefs.

Autor: Downie AT; Australian Research Council Centre of Excellence for Coral Reef Studies, James Cook University, Townsville, Australia.; School of Biological Sciences, University of Queensland, St. Lucia, Australia., Lefevre S; Section for Physiology and Cell Biology, Department of Biosciences, University of Oslo, Oslo, Norway., Illing B; Australian Research Council Centre of Excellence for Coral Reef Studies, James Cook University, Townsville, Australia.; Thünen Institute of Fisheries Ecology, Bremerhaven, Germany., Harris J; Australian Research Council Centre of Excellence for Coral Reef Studies, James Cook University, Townsville, Australia., Jarrold MD; Australian Research Council Centre of Excellence for Coral Reef Studies, James Cook University, Townsville, Australia.; College of Science and Engineering, James Cook University, Townsville, Australia., McCormick MI; Coastal Marine Field Station, School of Science, University of Waikato, Tauranga, New Zealand., Nilsson GE; Section for Physiology and Cell Biology, Department of Biosciences, University of Oslo, Oslo, Norway., Rummer JL; Australian Research Council Centre of Excellence for Coral Reef Studies, James Cook University, Townsville, Australia.; College of Science and Engineering, James Cook University, Townsville, Australia.
Jazyk: angličtina
Zdroj: PLoS biology [PLoS Biol] 2023 May 11; Vol. 21 (5), pp. e3002102. Date of Electronic Publication: 2023 May 11 (Print Publication: 2023).
DOI: 10.1371/journal.pbio.3002102
Abstrakt: Connectivity of coral reef fish populations relies on successful dispersal of a pelagic larval phase. Pelagic larvae must exhibit high swimming abilities to overcome ocean and reef currents, but once settling onto the reef, larvae transition to endure habitats that become hypoxic at night. Therefore, coral reef fish larvae must rapidly and dramatically shift their physiology over a short period of time. Taking an integrative, physiological approach, using swimming respirometry, and examining hypoxia tolerance and transcriptomics, we show that larvae of cinnamon anemonefish (Amphiprion melanopus) rapidly transition between "physiological extremes" at the end of their larval phase. Daily measurements of swimming larval anemonefish over their entire early development show that they initially have very high mass-specific oxygen uptake rates. However, oxygen uptake rates decrease midway through the larval phase. This occurs in conjunction with a switch in haemoglobin gene expression and increased expression of myoglobin, cytoglobin, and neuroglobin, which may all contribute to the observed increase in hypoxia tolerance. Our findings indicate that critical ontogenetic changes in the gene expression of oxygen-binding proteins may underpin the physiological mechanisms needed for successful larval recruitment to reefs.
Competing Interests: The authors have declared that no competing interests exist
(Copyright: © 2023 Downie et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.)
Databáze: MEDLINE
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