Abstract
Two zooxanthellate, scleractinian species present in the equatorial eastern Pacific, Psammocora stellata and Psammocora profundacella, were examined in terms of their reproductive biology and ecology at four study sites, non-upwelling (Caño Island, Costa Rica, and Uva Island, Panamá), upwelling (Gulf of Panamá, Panamá), and seasonally varying thermal environments (Galápagos Islands). Both species were gonochoric broadcast spawners lacking zooxanthellae in mature ova. Mature gametes and spawned gonads are present around full moon; however, no spawning was observed naturally or in outdoor aquaria. Mature gametes occurred in P. stellata at Caño Island for nearly 6 months, and year round at Uva Island, both non-upwelling sites. Reproductively active colonies occurred mostly in the warmer months in the Gulf of Panamá and Galápagos Islands. In the Galápagos Islands, where collecting effort was greatest for P. profundacella, mature gametes were also most prevalent during the warm season. Annual fecundity was high in both species, 1.3–1.8 × 104 ova cm−2 year−1 in P. stellata and 1.2–2.0 × 104 ova cm−2 year−1 in P. profundacella. Compared to other eastern Pacific corals, P. stellata was relatively resistant to ENSO-related bleaching and mortality, especially populations inhabiting deep (12–20 m) coral communities. Rapid recovery and persistence of Psammocora spp. can be attributed to several factors: (a) relative resistance to bleaching, (b) deep refuge populations, (c) broadcast spawning, (d) protracted seasonal reproduction, (e) high fecundity, and (f) asexual propagation.
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Acknowledgments
We thank Adrienne M. S. Correa, Peggy Fong, Christiane Hueerkamp, Priscilla Martínez, and Fernando Rivera for help in the field, and Rebecca Ball-Bailey, Kathy Black, Kathryn Brown, Erin Kapostasy, Susan Laessig, Alison Moulding, Juan Peña, David Smith, Joy H Ting, Bonnie Tucker, and Joyce A Yager for various analytical tasks in the laboratory. Francesca Benzoni kindly assisted in the identification of Psammocora species. The following host countries, agencies, and institutions granted permission and variously assisted during the course of this study: Costa Rica, Centro de Investigaciones en Ciencias del Mar y Limnología (CIMAR), Universidad de Costa Rica, and Sistema Nacional de Áreas de Conservación, Ministerio del Ambiente y Energía; Panamá, Departamento de Biología Acuática (Universidad de Panamá), Autoridad Nacional del Ambiente (ANAM), and Smithsonian Tropical Research Institute; Ecuador, Charles Darwin Research Station, and the Galápagos National Park Service. Research support was provided by the U. S. National Science Foundation, Biological Oceanography Program, grant OCE-0526361 and earlier awards.
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Communicated by J. P. Grassle.
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Glynn, P.W., Colley, S.B., Maté, J.L. et al. Reef coral reproduction in the equatorial eastern Pacific: Costa Rica, Panamá, and the Galápagos Islands (Ecuador). VII. Siderastreidae, Psammocora stellata and Psammocora profundacella . Mar Biol 159, 1917–1932 (2012). https://doi.org/10.1007/s00227-012-1979-5
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DOI: https://doi.org/10.1007/s00227-012-1979-5