Rapid decline in the number of breeding pairs of <i>Tachypleus tridentatus</i> and the degradation of sandbanks for spawning due to cumulative bay mouth modifications at Tsuyazaki Cove, Fukuoka, Japan

DOI Web Site
  • Itaya Shinji
    Ecological Engineering Laboratory, Department of Urban and Environmental Engineering, Graduate School of Engineering, Kyushu University Tsuyazaki Seaside Nature School
  • Seino Satoquo
    Ecological Engineering Laboratory, Department of Urban and Environmental Engineering, Graduate School of Engineering, Kyushu University
  • Wada Toshifumi
    Institute of Natural and Environmental Sciences, University of Hyogo
  • Shuuno Mari
    Tsuyazaki Seaside Nature School

Bibliographic Information

Other Title
  • 福岡県津屋崎入江におけるカブトガニ繁殖数の減少と累積的湾口改変による産卵基盤である砂州の劣化
  • フクオカケン ツヤサキ イリエ ニ オケル カブトガニ ハンショクスウ ノ ゲンショウ ト ルイセキテキ ワンコウ カイヘン ニ ヨル サンラン キバン デ アル サス ノ レッカ

Search this article

Description

<p>Possible factors causing the decline of the endangered horseshoe crab species Tachypleus tridentatus were revealed by interpretation of aerial photographs, interviews with residents, and field surveys at Tsuyazaki Cove, Fukuoka, Japan. The interviews confirmed that T. tridentatus had been abundant in the area from the 1940s to the 1980s; however, the species decreased gradually and was rarely seen by the locals in the early 2000s. A field survey from 2005 to 2013 confirmed that the number of breeding horseshoe crabs had decreased dramatically over the survey period. The study results suggest that the decline in T. tridentatus can be explained by reclamation of the bay mouth. This caused poor sand supply to potential spawning sites, which in turn resulted in the degradation of the habitat of local populations of T. tridentatus. The historical ecology approaches applied here could be useful as a primary analysis tool to search for clues regarding causal relationships between the population decline of rare species and coastal development.</p>

Journal

Keywords

Details 詳細情報について

Report a problem

Back to top