Bulletin of the Hiroshima University Museum Issue 12
2020-12-25 発行

瀬戸内海西部における褐藻クロメの生態学的特性 Ⅰ.現存量と生産量,および形態の多様性

Ecological characteristics of Ecklonia cava ssp. kurome (Laminariales, Phaeophyceae) in the western Seto Inland Sea I. biomass, production rates and morphological diversity
YOSHIDA, Goro
SHIMABUKURO, Hiromori
HORI, Masakazu
MURASE, Noboru
file
abstract
Ecklonia cava ssp. kurome is the only perennial kelp which is distributed in the central and western areas of the Seto Inland Sea, and is an important component of macroalgal beds in these areas. Biomass and production rates of this species were surveyed at three islands (Heigun-jima Is., Kata-shima Is. and Yashiro-jima Is.) in the western Seto Inland Sea during 2012–13. The mean biomass of dominant stands in the luxuriant season (June–July) ranged from 0.7 to 1.3 kg DW m-2 and the mean adult thallus density was approximately in the range of 10–20 inds. m-2. Net production was estimated by the leaf-marking method at Kata-shima Is. and Matsu-ga-hana in Yashiro-jima Is. Estimated production rates were 10.4–15.6 g DW m-2 d-1 in the luxuriant season, 1.8–5.3 g DW m-2 d-1 in the senescent season (October–November), and 5.8–12.9 g DW m-2 d-1 in the growth season (February–March). These trends were similar to those for E. cava ssp. kurome and its closely related E. cava ssp. cava reported in the Pacific Ocean and East China Sea, respectively. Morphological characteristics, such as stipe length, length/width ratio of the central blade and the primary pinna number index (PPNI) of adult E. cava ssp. kurome thalli exhibited significant differences in the luxuriant season among the survey sites, which reflected variable environmental conditions in their habitats.
description
本研究は,水産庁「地球温暖化対策推進費委託事業」のうち「藻場・干潟の炭素吸収源評価と吸収機能向上技術の開発」(平成23,24年度)の一環として実施し, とりまとめにあたってはJSPS科研費18H02268(代表者;吉田吾郎)の助成を受けた。
subject
クロメ
瀬戸内海
現存量
生産量
形態
Ecklonia cava ssp. kurome
Seto Inland Sea
biomass
production
morphology
rights
Copyright (c) 2020 広島大学総合博物館 Hiroshima University Museum