Effects of Current Velocity and Suspended Debris on the Drift Feeding of Arctic Grayling
作者:
W.J. O'Brien,
J.J. Showalter,
期刊:
Transactions of the American Fisheries Society
(Taylor Available online 1993)
卷期:
Volume 122,
issue 4
页码: 609-615
ISSN:0002-8487
年代: 1993
DOI:10.1577/1548-8659(1993)122<0609:EOCVAS>2.3.CO;2
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
We videotaped Arctic graylingThymallus arcticusfeeding on largeDaphnia middendorffianadrifting at different water velocities in an experimental stream with and without stream debris. The angle and distance at which fish first located each prey was determined from the videotapes. Both measures were affected by stream velocity and added debris. Location distance was unchanged at the lower velocities (11.6 and 32.3 cm/s) but declined at higher velocities. However, prey encounter rate increased up to water velocities of 45.8 cm/s, and thus water velocity compensated for reduced search area. Added debris always shortened location distance and decreased location angle. These findings have implications for position choice in streams and search strategies.
点击下载:
PDF (538KB)
返 回