Restoration of a small-sized macroalgal bed through the removal of sea urchins in Kashiyama, Nagasaki Prefecture

DOI Web Site Web Site 1 Citations 9 References
  • KADOTA TATSURU
    Nagasaki Field Station, Fisheries Technology Institute, Japan Fisheries Research and Education Agency
  • KIYOMOTO SETUO
    Nagasaki Field Station, Fisheries Technology Institute, Japan Fisheries Research and Education Agency
  • MASUDA YOSHIKO
    Nagasaki Field Station, Fisheries Technology Institute, Japan Fisheries Research and Education Agency
  • MIYANO TEPPEI
    Nagasaki Sales Office, Kunitomi Co., Ltd.
  • YOSHIMURA TAKU
    Nagasaki Field Station, Fisheries Technology Institute, Japan Fisheries Research and Education Agency

Bibliographic Information

Other Title
  • 長崎県樫山町地先におけるウニの密度管理による小型海藻藻場の造成
  • ナガサキケン カシヤマチョウチサキ ニ オケル ウニ ノ ミツド カンリ ニ ヨル コガタ カイソウ モバ ノ ゾウセイ

Search this article

Abstract

<p>　In this study, a small-sized macroalgal bed was restored through the removal of sea urchins at a barren site in Kashiyama, Nagasaki Prefecture. Sea urchin densities decreased from 13.9 to 0.7 individuals/m2 from June to November 2015, and remained low afterward. By the following spring, small-sized macroalgae such as Gelidiaceae spp. and Chondrophycus undulatus increased while large-sized macroalgae did not. The coverage of the small-sized macroalgae was three times that of the control area, in which the densities of sea urchins exceeded 12.2 individuals/m2 throughout the experimental period. Tank experiments showed that many of the small-sized macroalgae examined (Dictyopteris undulata, D. prolifera, Gelidium elegans, and Dichotomaria falcata) were less vulnerable to feeding by Siganus fuscescens and Kyphosus bigibbus than large-sized macroalgae (Sargassum alternato-pinnatum). Our results indicate that small-sized macroalgal beds can be more easily restored than large-sized macroalgal beds simply through the removal of sea urchins, even under high browsing pressure from herbivorous fish. In small-sized macroalgal beds, the gonad index of Heliocidaris crassispina was higher than that of animals in the barren areas. Therefore, the restoration of small-sized macroalgal beds would likely be advantageous to sea urchin fisheries.</p>

Journal

  • NIPPON SUISAN GAKKAISHI

    NIPPON SUISAN GAKKAISHI 88 (2), 49-57, 2022-03-15

    The Japanese Society of Fisheries Science

Citations (1)*help

See more

References(9)*help

See more

Keywords

Details 詳細情報について

Report a problem

Back to top