Larval recruitment process in the catadromous life history of Hediste diadroma (Nereididae, Annelida) in an estuary in Kagoshima Bay, Southern Japan

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  • Kan Kotaro
    Graduate School of Science and Engineering, Faculty of Science, Kagoshima University
  • Kuroki Yoshifumi
    Graduate School of Science and Engineering, Faculty of Science, Kagoshima University
  • Sato Masanori
    Graduate School of Science and Engineering, Faculty of Science, Kagoshima University
  • Tosuji Hiroaki
    Graduate School of Science and Engineering, Faculty of Science, Kagoshima University

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タイトル別名
  • Larval recruitment process in the catadromous life history of <i>Hediste diadroma</i> (Nereididae, Annelida) in an estuary in Kagoshima Bay, Southern Japan

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説明

<p>The recruitment process of planktic larvae of the nereidid polychaete Hediste diadroma, which has a catadromous life cycle, was examined in an estuary in Kagoshima Bay, Southern Japan. Our laboratory experiments showed that the phototaxis of the planktic larvae changed drastically from positive to negative during the 3-chaetiger nectochaeta, 3.5–4.0 days after fertilization. During this stage, the prostomial antennae, first peristomial cirri, and anal cirri appeared and the ciliary bands used for swimming were reduced; these results suggest that larvae shifted from pelagic to demersal stage at approximately 4.0 days after fertilization. Field sampling took place in the estuary, where reproductive swarming of mature adults was observed in late February to April; planktic larvae of, mainly, 5- to 8-chaetiger stages were collected in evening high tides during the spring tides of April and May 1989, 2013, and 2015. During the same period, 5- or higher chaetiger benthic juveniles were collected at low tide from intertidal flats from a wide area of the estuary where adults inhabited. The morphology of benthic juveniles of 5- and 6-chaetiger stages differed from that of planktic larvae of the same stages in the following characteristics: (1) the long larva-specific spinigers were lost; (2) the second peristomial cirri, originating from the parapodial lobes of chaetiger 1 of the planktic larvae, appeared; and (3) the anal cirri were elongated. Our results indicate that 5- to 8-chaetiger nectochaeta are critical phases for the successful settlement of planktic larvae, which come back into an estuary with rising tides.</p>

収録刊行物

  • Plankton and Benthos Research

    Plankton and Benthos Research 15 (1), 30-43, 2020-02-28

    日本プランクトン学会、日本ベントス学会

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