Structures and seasonal changes of annual Zostera marina population in Tategami-ura, Ago Bay, Mie Prefecture, central Japan

三重県英虞湾立神浦における一年生アマモ群落の構造と季節変化

Structures and seasonal changes of annual Zostera marina population in Tategami-ura, Ago Bay, Mie Prefecture, central Japan

This study clarified the structures and seasonal changes of the annual Zostera marina population from April 2003 to November 2004, growing at Tategami-ura, Ago bay, Mie prefecture. Productive structures showed the graminous types excluding flowering period (May-June). Biomass and shoot density reached maximum values in May-June. At that time, over 80% of shoots were flowering shoots. And then, all shoots were disappeared in summer. From October-November, a lot of seedlings recruited and grew to flowering shoots by next spring. Maximum daily net production showed 4.50 g m^-2 day^-1 in June, which was similar level to that of the perennial Zostera marina population. However, yearly net production (305.0 g m^-2 year^-1) showed lower than that of the perennial type. Yearly maximum biomass was 152.6 g m^-2, and production/biomass (P / B) ratio was 2.0. It is necessary to more research in the production because the biomass and shoot density of the annual population verify drastically year to year.

Creators Abe Mahiko

Creators Kawahara Rie

Creators Yokota Keigo

Creators Goto Masaki

Creators Kurashima Akira

Creators Maegawa Miyuki

[ISSN]0370-9361