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ID 24707
file
55-1980.pdf 1.33 MB
title alternative
Foraging Ecology of the Pomacentrid Fish Chromis margaritifer and Pornacentrus coelestis at Kuchierabu Island
creator
Noda, Mikio
Ikeda, Itaru
Hashimoto, Hiroaki
Gushima, Kenji
subject
個別摂餌
シコクスズメダイ
食性
ソラスズメダイ
動物プランクトン
particulate-feeding
Pomacentridae
zooplankton
feeding habit
NDC
Zoology
abstract
小型のスズメダイ科魚類であるシコクスズメダイ Chromis margaritifer とソラスズメダイ Pomacentrus coelestis の採餌様式について潜水観察と胃内容物調査および飼育実験の結果から検討した。両種ともに水中の餌生物をついばむ'個別撰餌'と基盤上の藻類を噛み取る'はみ取り'が観察された。個別摂餌の観察頻度が両種とも70%を超えたが、ソラスズメダイでははみ取りも普通に観察された。胃内容物の分析では、両種とも浮遊性カイアシ類と藻類が主要な餌生物であった。胃中のカイアシ類の体長組成を両種間で比較するとシコクスズメダイはより大型のカイアシ類を利用した。ソラスズメダイは個別摂餌が不活発になるとはみ取りへ移行することが多かった。連続した複数回の噛む動作からなるはみ取りでは、個別摂餌が不活発な状態からはみ取りへ移行した場合に一続きのはみ取りの噛む回数が増加した。飼育実験の結果では、浮遊状態にある底生藻類の破片を摂食することは両種ともになかった。動物プランクトンの短期変動との関連においてこれら2種の採餌様式が議論された。
abstract
Foraging behavior and diet of Chromis margaritifer and Pomaceritrus coelestis were investigated on shallow reef habitats at Kuchierabu Island (30° 28' N, 130° 12' E), southern Japan, from July to November 1988. Observations of feeding behavior of both species showed major utilization of planktonic prey; more than 70% of the foraging (C. margaritifer, 99%; P. coelestis, 78%) was particulate-feeding in the water column and the other was browsing on the substratum. Differences in foraging between the two species were conspicuous in frequency of browsing and P. coelestis were often seen browsing. On the basis of stomach content analysis, both species preyed mainly on planktonic copepods and benthic algae, and in particular, algae were relatively more important to P. coelestis. In addition, C. margaritifer tended to prefer relatively larger planktonic copepods. A shift from particulate-feeding to browsing showed a difference in accordance with the intensity and activity of particulate-feeding for P. coelestis; a shift to browsing following inactive particulate-feeding was frequently observed. Number of bites in browsing for P. coelestis was much more in bouts of browsing following inactive particulate-feeding than in bouts of browsing following active particulate-feeding. In a feeding experiment using a small acrylic tank, both species exhibited no feeding on floating benthic algae collected in the field. Feeding pattern of both species were discussed in relation to short-term fluctuations in density of prey-sized zooplankters.
journal title
Journal of the Faculty of Applied Biological Science, Hiroshima University
volume
Volume 35
issue
Issue 2
start page
113
end page
123
date of issued
1996-12
publisher
広島大学生物生産学部
農林水産研究情報センター
issn
1341-691X
ncid
SelfDOI
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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