Foraging and Prey Selection by Bluespotted SunfishEnneacanthus gloriosus(Holbrook) in Backwater, Vegetated Ponds in Coastal Mississippi
作者:
DouglasJ. Snyder,
MarkS. Peterson,
期刊:
Journal of Freshwater Ecology
(Taylor Available online 1999)
卷期:
Volume 14,
issue 2
页码: 187-196
ISSN:0270-5060
年代: 1999
DOI:10.1080/02705060.1999.9663670
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
Bluespotted sunfish are diurnal foragers in coastal Mississippi preying mainly on cyclopoid copepods, amphipods, cladocerans, chironomids, ostracods, and gastropods. Cyclopoid copepods, cladocerans, chironomid larvae and oligochaetes were collected in submersed aquatic vegetation (SAV)/SAV-associated sediments throughout the year but were most abundant in the warm (April-September) months. Ostracods, amphipods, and hydracarinids were also collected in SAVISAV-associated sediments throughout the year but tended to be most abundant during fall, winter and early spring (October-April). Fish ≥ 20 mm standard length (SL) selected 87.5% of the available prey from SAV/SAV-associated benthos compared to fish < 20 mm SL, which selected only 40%. Mean annual electivity values suggested random prey selection. The only obvious difference in diet was that fish ≥ 20 mm SL consumed gastropods and amphipods while fish < 20 mm SL rarely consumed amphipods and never consumed gastropods. Bluespotted sunfish exhibit an opportunistic feeding behavior and apparently feed outside the SAV when small but shift into SAV as they grow.
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