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ID 39870
file
title alternative
A quantitative comparison of fish assemblage between amacroalgae bed and an adjoining sandy beach in the central Seto Inland Sea
creator
Hirai, Kotaro
Kamimura, Yasuhiro
Iwamoto, Yuji
Morita, Takuma
subject
ガラモ場
砂浜
魚類群集
生息場
macloalgae bed
sandy beach
fish assemblage
habitat
NDC
Fishing industry. Fisheries
abstract
植生の有無が魚類群集に与える影響を明らかにすることを目的として,瀬戸内海中央部の無人島(小久野島)の東岸において隣接するガラモ場と砂浜の魚類相調査を実施した。ガラモ場と砂浜に10m四方(面積100m2)の調査区画を各4ヶ所設定し,季節に1回の頻度で(2006年8月,11月,2007年2月,5月)小型巻網(目合い4mm)を用いて区画内の魚類をすべて採集した。一年間の調査により,ガラモ場で20種以上1,397個体,砂浜で17種以上902個体の魚類が採集された。個体数にもとづく優占種(上位3種)は,ガラモ場ではシロメバル,ヒメハゼ,ハオコゼ,砂浜ではヒメハゼ,ボラ,スジハゼ,湿重量にもとづく優占種は,ガラモ場ではシロメバル,ハオコゼ,キュウセン,砂浜ではヒメハゼ,シロギス,ボラであった。100m2あたりの出現種数,個体密度,バイオマスはいずれもガラモ場において大きな季節変動を示した。8月にはガラモ場における種数が砂浜よりも有意に多かった。ガラモ場においては,ホンダワラ類の繁茂期である2-5月にシロメバル仔稚魚の来遊にともなう個体密度とバイオマスの急増が認められた。
abstract
Biological and physical surveys were conducted at amacloalgae bed (MB) and a sandy beach (SB) off an inhabited island in the central Seto Inland Sea, Japan, from August 2006 tomay 2007 in order to detect the effect of vegetation on fish assemblage. Fish were collected using a seine net (2m in height, 3mm in mesh aperture) at four separate locations within MB and SB during a tidal level between 70-130 cm in daytime on 4 Aug. and 16 Nov. 2006 and 19 Feb. and 2 May 2007. A total of 1,397 and 902 fish were collected at MB and SB, respectively. The numerically dominant species were Sebastes cheni, Favonigobius gymnauchen and Hypodytes rubripinnis in MB and Favonigobius gymnauchen, mugil cephalus cephalus and Acentrogobius pflaumii in SB. Weight-based dominant species were Sebastes cheni, Hypodytes rubripinnis and Halichoeres poecilopterus in MB and Favonigobius gymnauchen, Sillago japonica and Mugil cephalus cephalus. Seasonal fluctuation in number of fish species, fish abundance and biomass in MB were larger than those in SB.

The number of fish species in August in MB was significantly higher than that in SB. Fish abundance and biomass in MB abruptly increased fromFebruary to May due to immigration of S. cheni larvae and juveniles.
journal title
Journal of the Graduate School of Biosphere Science, Hiroshima University
volume
Volume 48
start page
1
end page
7
date of issued
2009-12-25
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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