No bundles beyond this point: the coral sterile zone
Many species of colonial corals have sterile zones—areas where polyps are sexually immature. While inconspicuous in many species, the sterile zones observed in Acropora glauca in 2019 were striking, likely due to the tabular growth morphology, highly pigmented eggs, and high degree of intracolony spawning synchrony in this species.
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Affiliations: Australian Institute of Marine Science, PMB No. 3 Townsville Queensland, 4810 Australia
Appeared or available online: June 12, 2020