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ID 28936
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title alternative
Annual variations in the occurrence of the scyphomedusa Aurelia aurita population in Uwa Sea, western Shikoku, and their predation impact on mesozooplankton
creator
Aoyama, Masashi
Takeoka, Hidetaka
subject
Aurelia aurita
biomass
mesozooplankton
predation impact
Uwa Sea
NDC
Zoology
abstract
In Uwa Sea, western Shikoku, the scyphomedusa Aurelia aurita occurs in the plankton from January to October, and forms dense aggregations in inlet waters in July onward. The population biomass of A. aurita in the Uwa Sea was estimated by means of composite airphotographs and groundtruth net surveys in 2001-2003. The biomass showed marked geographical variations. The annual maximum biomass ranged from 5.02 x 10^3 ton in 2003 to 7.86 x 10^3 ton in 2002. The gastric pouch contents revealed that the medusae ate mesozooplankton, mainly copepods. Under average medusa density (i.e. 0.56 indiv. m^<-2> or 42.2 g wet weight m^<-2>), the daily predation impact was estimated to be 1.1% of mesozooplankton biomass or 12.4% of mesozooplankton production rate.
journal title
日本プランクトン学会報
volume
Volume 52
issue
Issue 1
start page
38
end page
41
date of issued
2005-02
publisher
日本プランクトン学会
農林水産研究情報センター
issn
0387-8961
ncid
language
jpn
nii type
Journal Article
HU type
Journal Articles
DCMI type
text
format
application/pdf
text version
publisher
rights
Copyright (c) 2005 The Plankton Society of Japan
department
Graduate School of Biosphere Science