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Title: Contrasting patterns of juvenile chinook salmon (Oncorhynchus tshawytschaw) growth, diet, and prey densities in off-channel and main stem habitats on the Sacramento River. |
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Abstract/Description: Few studies have quantified juvenile salmon growth in or between different
habitats or evaluated the specific mechanisms by which salmon growth and survival
might be enhanced. We utilized otolith microstructure to estimate daily relative growth
rates among main channel areas, off-channel ponds, and non-natal seasonal tributaries of
the Sacramento River. To examine possible mechanisms leading to growth differences,
prey availability, prey preference, and stomach fullness were estimated at each site. We
observed wider daily increment widths, higher prey densities, and warmer temperatures
in off-channel ponds and non-natal seasonal tributaries in both 2001 and 2002.
Chironomidae larve, pupae, and adult diptera were the preferred prey in all habitats. No
difference in stomach fullness was found between habitats. In 2001, all habitats had
higher temperatures, wider daily increment widths, higher prey densities, and higher
stomach fullness than in 2002. Our findings suggest the warmer temperatures and
abundant prey in off-channel habitats leads to higher growths rates, which in turn can
lead to higher juvenile survival rates.
Associated Projects:
Peer Review of San Joaquin River Dissolved Oxygen TMDL Studies, Non-Aeration Feasibility Studies Criteria Evaluation for the San Joaquin River Dissolved Oxygen TMDL, Peer Review of San Joaquin River Dissolved Oxygen TMDL Studies, Non-Aeration Feasibility Studies Criteria Evaluation for the San Joaquin River Dissolved Oxygen TMDL, Peer Review of San Joaquin River Dissolved Oxygen TMDL Studies, Non-Aeration Feasibility Studies Criteria Evaluation for the San Joaquin River Dissolved Oxygen TMDL
Main Subjects:
Habitat / Species
Specific Subjects:
fish
Species Keywords:
Chinook salmon
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| Publication & Citation |
Author(s):
Mike Limm, Michael Marchetti
Contributor(s):
Citation:
Limm, M.P. and M.P. Marchetti. 2003. Contrasting patterns of juvenile chinook salmon (Oncorhynchus tshawytschaw) growth, diet, and prey densities in off-channel and main stem habitats on the Sacramento River. Report to The Nature Conservancy. Available at http://www.sacramentoriverportal.org
Publisher:
The Nature Conservancy
Publication Date:
May
13,
2003
Currentness:
Funder(s):
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| Format & Access |
Information Resource Type:
(Documents)
Media Type / Format:
Computer File
Access Limitations:
Public
Use Limitations:
No Limitations
To Obtain:
Open/Download (off-site link)
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| Location Information |
Cities / Urban Areas:
Counties:
Specific Location Names:
Undefined:
Water / Special Districts:
Watershed / Streams:
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First Entered by:
Greg Golet on 2003/10/08
Last Edited by:
Greg Golet on 2003/10/08
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