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Distribution and sediment production of large benthic foraminifers on reef flats of the Majuro Atoll, Marshall Islands

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Abstract

The distributions and population densities of large benthic foraminifers (LBFs) were investigated on reef flats of the Majuro Atoll, Marshall Islands. Annual sediment production by foraminifers was estimated based on population density data. Predominant LBFs were Calcarina and Amphistegina, and the population densities of these foraminifers varied with location and substratum type on reef flats. Both foraminifers primarily attached to macrophytes, particularly turf-forming algae, and were most abundant on an ocean reef flat (ORF) and in an inter-island channel near windward, sparsely populated islands. Calcarina density was higher on windward compared to leeward sides of ORFs, whereas Amphistegina density was similar on both sides of ORFs. These foraminifers were more common on the ocean side relative to the lagoon side of reef flats around a windward reef island, and both were rare or absent in nearshore zones around reef islands and on an ORF near windward, densely populated islands. Foraminiferal production rates varied with the degree to which habitats were subject to water motion and human influences. Highly productive sites (>103 g CaCO3 m−2 year−1) included an ORF and an inter-island channel near windward, sparsely populated islands, and a seaward area of a reef flat with no reef islands. Low-productivity sites (<10 g CaCO3 m−2 year−1) included generally nearshore zones of lagoonal reef flats, leeward ORFs, and a windward ORF near densely populated islands. These results suggest that the distribution and production of LBFs were largely influenced by a combination of natural environmental factors, including water motion, water depth, elevation relative to the lowest tidal level at spring tide, and the distribution of suitable substratum. The presence of reef islands may limit the distribution and production of foraminifers by altering water circulation in nearshore environments. Furthermore, increased anthropogenic factors (population and activities) may adversely affect foraminiferal distribution and production.

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Acknowledgements

The authors thank M. Chikamori, N. Mimura, and K. Konishi for their encouragement and discussion, and M. Watanabe, T. Yasukochi, H. Yokoki, Y. Kuwahara, T. Yamaguchi, S. Tanahashi, S. Yoshida, H. Shimazaki, T. Hayashi, D. Sato, K. Sato, D. Ogasawara, Y. Kai, T. Kurosaki, and N. Fukayama for discussion and assistance during this research. This research was funded by the Global Environmental Research Fund of the Ministry of the Environment, Japan (Project No. B15, Principal Investigator: H. Kayanne).

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Authors and Affiliations

  1. Department of Physics and Earth Sciences, University of the Ryukyus, 1 Senbaru, Nishihara, Okinawa, 903-0213, Japan

    K. Fujita

  2. Department of Earth and Planetary Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo, 113-0033, Japan

    Y. Osawa & H. Kayanne

  3. Oceanic Planning Corporation, 6015-7 Imazu, Fukuoka, 819-0165, Japan

    Y. Ide

  4. Center for Global Environmental Research, National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki, 305-8506, Japan

    H. Yamano

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  1. K. Fujita
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Correspondence to K. Fujita.

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Fujita, K., Osawa, Y., Kayanne, H. et al. Distribution and sediment production of large benthic foraminifers on reef flats of the Majuro Atoll, Marshall Islands. Coral Reefs 28, 29–45 (2009). https://doi.org/10.1007/s00338-008-0441-0

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