Abstract
Mesophotic coral ecosystems (MCEs), at ocean depths between 40 and 150 m, have been found throughout the tropics but are different in the Eastern Tropical Pacific (ETP). This observation is based on submersible dives that have explored several ETP mesophotic areas. The ETP is characterized by a shallow thermocline (approximately 50 m depth), reduction in light availability at deeper depths due to the accumulation of particulate matter at the thermocline, cold temperatures, low oxygen concentrations, and low aragonite saturation state (Ωarag) that may explain the absence of zoothanthellate corals below 40 m. Isla del Coco is located 500 km off the Pacific coast of Costa Rica. The MCEs of this island have been explored using the DeepSee submersible. There is a sharp change in benthic fauna, in both soft and hard bottoms, at approximately 50 m depth. The combination of the shallow thermocline bringing cold and low pH waters to near the surface plus the turbidity (low light) at the thermocline leads to a situation where zooxanthellate corals do not generally thrive below about 15–25 m depth (maximum around 40 m) and do not build reefs in deeper waters. The substrate between 50 and 150 m is densely covered with red algae (down to 90 m), octocorals, black corals, azooxanthellate corals, and calcareous hydroids. This chapter is the first synthesis of mesophotic environments of any ETP site and characterizes the MCEs of Isla del Coco National Park.
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Acknowledgments
This chapter is based primarily on observations and collections using the DeepSee submersible of the Undersea Hunter Group, which I greatly appreciate. Catalina Benavides drafted Fig. 26.1, Omar G. Lizano provided the data for Fig. 26.2, and Celeste Sánchez-Noguera provided useful information on aragonite saturation properties in the ETP. Beatriz Naranjo-Elizondo helped with the selection and preparation of the figures. Reviews of an early draft by Peter W. Glynn and Joanie Kleypas, a later draft by Derek Manzaello, Joanie Kleypas, and two anonymous reviewers, plus the final draft by Peter J. Auster and Lisa A. Levin, greatly improved the manuscript.
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Cortés, J. (2019). Isla del Coco, Costa Rica, Eastern Tropical Pacific. In: Loya, Y., Puglise, K., Bridge, T. (eds) Mesophotic Coral Ecosystems. Coral Reefs of the World, vol 12. Springer, Cham. https://doi.org/10.1007/978-3-319-92735-0_26
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