Get 20M+ Full-Text Papers For Less Than $1.50/day. Start a 14-Day Trial for You or Your Team.

Learn More →

Effect of velocity regime on ontogenetic dispersal and habitat use of Kootenai River White Sturgeon (Acipenser transmontanus, Richardson, 1836) early life stages: An artificial stream study

Effect of velocity regime on ontogenetic dispersal and habitat use of Kootenai River White... The effect was studied of two channel velocity regimes (slow regime = mean, 16.9 cm s−1; fast regime = mean, 23.4 cm s−1) on the behaviour and dispersal of Kootenai River white sturgeon Acipenser transmontanus early life stages (ELS = free embryos, larvae, early‐juveniles) in artificial streams. A conceptual model incorporating velocity effects on ELS behaviour and dispersal follows that: (1) most free embryos hide under cover and do not disperse in any velocity; (2) the velocity regime has the greatest effect on peak dispersal by larvae − dispersal is intense and short (11 and 13 days in 16.9 and 23.4 cm s−1, respectively); and (3) the long peak and valley dispersal (alternating periods of intense and slow dispersal) by post‐peak larvae and early‐juveniles, which lasts to day 74 post‐hatch (early‐September) for some fish, is not affected by the velocity regime. Edge velocity habitat (about 4 cm s−1 between eddy and channel velocities) was used by 65% of the late‐larvae foraging on drift during the day in either a slow or fast velocity regime, the edge being used even more at night (75% in fast velocity, 82% in slow velocity). Early‐juveniles also used edge habitat. Regulation of river flow should maintain a minimum 23 cm s−1 bottom velocity regime in the larval dispersal reach to trigger an intense dispersal from the spawning reach and enable fish to disperse quickly downstream. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Applied Ichthyology Wiley

Effect of velocity regime on ontogenetic dispersal and habitat use of Kootenai River White Sturgeon (Acipenser transmontanus, Richardson, 1836) early life stages: An artificial stream study

Download PDF
8 pages

Loading next page...
 
/lp/wiley/effect-of-velocity-regime-on-ontogenetic-dispersal-and-habitat-use-of-3egDFe3vg3

References (36)

Publisher
Wiley
Copyright
Copyright © 2014 Blackwell Verlag GmbH
ISSN
0175-8659
eISSN
1439-0426
DOI
10.1111/jai.12595
Publisher site
See Article on Publisher Site

Abstract

The effect was studied of two channel velocity regimes (slow regime = mean, 16.9 cm s−1; fast regime = mean, 23.4 cm s−1) on the behaviour and dispersal of Kootenai River white sturgeon Acipenser transmontanus early life stages (ELS = free embryos, larvae, early‐juveniles) in artificial streams. A conceptual model incorporating velocity effects on ELS behaviour and dispersal follows that: (1) most free embryos hide under cover and do not disperse in any velocity; (2) the velocity regime has the greatest effect on peak dispersal by larvae − dispersal is intense and short (11 and 13 days in 16.9 and 23.4 cm s−1, respectively); and (3) the long peak and valley dispersal (alternating periods of intense and slow dispersal) by post‐peak larvae and early‐juveniles, which lasts to day 74 post‐hatch (early‐September) for some fish, is not affected by the velocity regime. Edge velocity habitat (about 4 cm s−1 between eddy and channel velocities) was used by 65% of the late‐larvae foraging on drift during the day in either a slow or fast velocity regime, the edge being used even more at night (75% in fast velocity, 82% in slow velocity). Early‐juveniles also used edge habitat. Regulation of river flow should maintain a minimum 23 cm s−1 bottom velocity regime in the larval dispersal reach to trigger an intense dispersal from the spawning reach and enable fish to disperse quickly downstream.

Journal

Journal of Applied Ichthyology – Wiley

Published: Jan 1, 2014

There are no references for this article.