Abstract
Carbonate production by large benthic foraminifers is sometimes comparable to that of corals and coralline algae, and contributes to sedimentation on reef islands and beaches in the tropical Pacific. Population dynamic data, such as population density and size structure (size-frequency distribution), are vital for an accurate estimation of shell production of foraminifers. However, previous production estimates in tropical environments were based on a limited sampling period with no consideration of seasonality. In addition, no comparisons were made of various estimation methods to determine more accurate estimates. Here we present the annual gross shell production rate of Baculogypsina sphaerulata, estimated based on population dynamics studied over a 2-yr period on an ocean reef flat of Funafuti Atoll (Tuvalu, tropical South Pacific). The population density of B. sphaerulata increased from January to March, when northwest winds predominated and the study site was on the leeward side of reef islands, compared to other seasons when southeast trade winds predominated and the study site was on the windward side. This result suggested that wind-driven flows controlled the population density at the study site. The B. sphaerulata population had a relatively stationary size-frequency distribution throughout the study period, indicating no definite intensive reproductive period in the tropical population. Four methods were applied to estimate the annual gross shell production rates of B. sphaerulata. The production rates estimated by three of the four methods (using monthly biomass, life tables and growth increment rates) were in the order of hundreds of g CaCO3 m−2 yr−1 or cm−3 m−2 yr−1, and the simple method using turnover rates overestimated the values. This study suggests that seasonal surveys should be undertaken of population density and size structure as these can produce more accurate estimates of shell productivity of large benthic foraminifers.
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Acknowledgments
This research was supported by the Japanese government program for international joint research into global issues by researchers in Japan and developing countries (JST/JICA SATREPS: 0808918. PI: H. Kayanne), and partly by the international research hub project for climate change and coral reef/island dynamics, University of the Ryukyus. We greatly appreciate the assistance of the Department of Fisheries and the Government of Tuvalu for permission to carry out and coordinate our research. We also thank Y. Ide for support in conducting the fieldwork.
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Fujita, K., Otomaru, M., Lopati, P. et al. Shell productivity of the large benthic foraminifer Baculogypsina sphaerulata, based on the population dynamics in a tropical reef environment. Coral Reefs 35, 317–326 (2016). https://doi.org/10.1007/s00338-015-1375-y
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DOI: https://doi.org/10.1007/s00338-015-1375-y