Abstract
Detritivore sea cucumbers appear to have been abundant on historic tropical reefs, but (1) have been heavily exploited since at least the mid-1800s, (2) often show minimal recovery post-harvest, and (3) are relatively depleted from modern marine communities. Because they were more abundant, fed on bacteria, microalgae, and other organics, and processed tremendous masses of sediments, removing these detritivores from tropical seas may have suppressed removal of sedimentary pathogens, and impacted co-occurring species in ways that are not documented. We conducted enclosure and exclosure experiments of the sea cucumber Holothuria atra in a back reef lagoon in Moorea, French Polynesia and found that excluding this sea cucumber increased a measure of sediment surface pigmentation by about 10 × but also decreased the potency of extracts from a co-occurring coral (Acropora cytherea) against the heat-activated coral pathogen Vibrio coralliilyticus by a significant 52%. This suggests that the large-scale removal of detritovores from shallow tropical seas may make some co-occurring foundation species more susceptible to pathogens during periods of elevated temperatures or other stresses.
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Acknowledgements
Financial support came from U.S. National Science Foundation Grant OCE 1947522, the National Geographic Society (Grant No. NGS-57078R-19), the Teasley Endowment, and the Anna and Harry Teasley Gift Fund. This work represents a contribution of the Moorea Coral Reef (MCR) LTER Site supported by U.S. National Science Foundation Grant OCE 16-37396. We thank the French Polynesian Government (Délégation à la Recherche) and the Haut-commissariat de la République en Polynésie Française (DTRT) for relevant permits (Protocole d'Accueil 2017–2020).
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Grayson, N., Clements, C.S., Towner, A.A. et al. Did the historic overharvesting of sea cucumbers make coral more susceptible to pathogens?. Coral Reefs 41, 447–453 (2022). https://doi.org/10.1007/s00338-022-02227-w
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DOI: https://doi.org/10.1007/s00338-022-02227-w