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Low density populations of anemonefish with low replenishment rates on a reef edge with anthropogenic impacts

  • Kina HayashiEmail author
  • Katsunori Tachihara
  • James Davis Reimer
Article

Abstract

The population dynamics of anemonefish are expected to have unique patterns because of the symbiotic relationship with host anemones. Recent anthropogenic impacts may affect the abundance of anemones, which may also affect population dynamics of anemonefish. However, long-term field studies and demographic data on reproduction, immigration, and mortality rates are deficient. Here, we investigated the dynamics of anemonefish for 3 years on the reef edge with anthropogenic impacts of Okinawa-jima Island, southern Japan. During the study period, six species of host anemone were used as spawning grounds by four species of anemonefish, and as nurseries by six species of immature anemonefish. The density of breeding pairs was low (0.21–1.46 /ha), which may have been restricted by the abundance of host anemones. Survival rates were different among species; from 0.21 to 1.00 over 3 years. Ten cases of dissolution of breeding pairs were observed during the 3 years, and only five pairs were replenished. Through the study period, 215 individuals of six species of immature fish immigrated into the study site, and this number was skewed due to higher numbers of Amphiprion clarkii (77.7%). Demographic patterns differed among species, and requirements for conservation will therefore be different among species on the reef edges of Okinawa-jima Island under anthropogenic impact.

Keywords

Amphiprion Host anemone Immigration Population dynamics Survival rate Okinawa 

Notes

Acknowledgements

We thank MISE and Tachihara laboratory members (University of the Ryukyus) who gave advice and helped with field work during this study. We also thank Okinawa Prefectural Archives for sharing historical aerial photographs. Two anonymous reviewers greatly improved an earlier version of this manuscript.

Compliance with ethical standards

All applicable international, national, and/or institutional guidelines for the care and use of animals were followed.

Conflict of interest

All authors declare that they have no conflict of interest.

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Copyright information

© Springer Nature B.V. 2019

Authors and Affiliations

  1. 1.Graduate School of Engineering and ScienceUniversity of the RyukyusOkinawaJapan
  2. 2.Tropical Biosphere Research CenterUniversity of the RyukyusOkinawaJapan

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