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ID 39925
file
title alternative
Ecological traits and their diversities of five Zostera marina populations in and around Hiroshima Bay, the Seto Inland Sea, Japan
creator
Yoshida, Goro
Tanimoto, Terumi
Aida, Satoshi
Kajita, Atsushi
Mizutani, Hiroshi
Omoto, Shigeyuki
Saito, Kenji
Moriguchi, Akihiko
Hori, Masakazu
Hamaguchi, Masami
Terawaki, Toshinobu
subject
アマモ
海草
株密度
現存量
地域個体群
biomass
density
local population
seagrass
Zostera marina
NDC
Botany
abstract
広島湾および周辺海域の5カ所の生育地のアマモZostera marinaの生態的特性を2004年の繁茂期に調査した。調査場所は広島湾奥部の阿品(St.1),同湾央部の大黒神島(St.2),同湾口部の屋代島(St.3),柳井湾奥部の伊保庄(St.4),および同湾外部に位置する平郡島(St.5)である。アマモの分布水深は生育地により異なり,St.1,St.2では海底でのアオサ類等の堆積により,分布下限水深は1-2m(C.D.L. 基準)までである一方,他の生育地では4-6mまで分布した。アマモの平均現存量は120-180g DWm-2の範囲にあったが,アマモの株のサイズと密度は生育地により異なっていた。平均株密度は生育地により88-278 shoots m-2の範囲であり,St.3およびSt.5では特に浅所で小型の株が密生した。これらの群落では,総現存量に占める地下部現存量の割合が相対的に大きかった。一方,湾奥部に位置するSt.1とSt.4では,アマモの株は大型である一方生育密度は低かった。群落内の底質の粒度組成の相違から,波浪流動等の物理的環境が生育地間で異なることが示唆され,それぞれの場所のアマモの生態的特性はその影響を受けていると考えられた。
abstract
Ecological traits of five Zostera marina populations in and around Hiroshima Bay were investigated in a luxuriant season of 2004. Study sites were located at the most inner (Ajina; St.1), center (O-kurokami-jima; St. 2) and near the mouth area (northern coast of Yahiro-jima; St. 3) of Hiroshima Bay, and at the inner area (Ihono-sho; St. 4) and the outside (Heigun-jima; St.5) of Yanai Bay which is the strait adjacent to Hiroshima Bay. The distribution depth (C.D.L.) was different among the populations. The lower depth of Zostera distribution was limited to 1-2 m at St.1 and 2 by algal-mat of Ulva spp. and other macroalgae, though it was 4-6 m at St. 3-5. Mean biomass was ranged in 120-180g DWm-2, but shoot size and density was different among the populations. Mean density ranged between 88-278 shoots m-2, and the populations at St.3 and 5 exhibited higher densities with smaller shoots especially in shallow stands of the two population. These stands also exhibited higher proportion of below-ground biomass to total biomass. On the contrary, populations in inner areas (St. 1 and 4) exhibited lower density with larger shoots. Physical conditions such as water motion induced by waves were different among the habitats which were shown in grain size compositions of the sediments, and this could affect the ecological traits of each Z. marina population.
description
本調査は,水産庁委託「生物多様性に配慮したアマモ場造成技術開発調査事業」(平成16~18年度)の一環として実施されたものである。
journal title
Journal of the Graduate School of Biosphere Science, Hiroshima University
volume
Volume 52
start page
71
end page
86
date of issued
2013-12-25
publisher
広島大学大学院生物圏科学研究科
issn
1348-1371
ncid
naid
language
jpn
nii type
Departmental Bulletin Paper
HU type
Departmental Bulletin Papers
DCMI type
text
format
application/pdf
text version
publisher
department
Graduate School of Biosphere Science
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