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Interannual variability in the effects of physical habitat and parentage on Chinook salmon egg-to-fry survival

Interannual variability in the effects of physical habitat and parentage on Chinook salmon egg-to-fry survival
Interannual variability in the effects of physical habitat and parentage on Chinook salmon egg-to-fry survival
Mortality during incubation is believed to be a major factor limiting the recovery of many salmon populations, though direct field measurements of egg-to-fry survival are rare or small in scale. To determine the effects of physical habitat (river reach, fine sediment intrusion, scour), parentage (mating, source of gametes) on Chinook salmon (Oncorhynchus tshawytscha) egg-to-fry survival and developmental stage at emergence across a basin, we constructed 324 artificial redds in nine reaches over 4 years in the Yakima River Basin, Washington, USA. Mean egg-to-fry survival ranged from 49% to 69% annually from 2009 to 2012 brood years. Survival was significantly different among reaches in 2010, but not in 2009, 2011, or 2012, while mating was a significant factor in all years but 2010. In contrast, developmental stage differed significantly among reaches and matings in all 4 years. Percentage of fines, days-in-gravel, and median particle size explained only small (<10%) additional amount of variation in survival or developmental stages. Our results suggest that parentage and reach within a basin are major factors influencing egg-to-fry survival, but their relative influence varies annually, presumably depending on the magnitude of high flows and scour during incubation.
0706-652X
1047-1059
Roni, Philip
ed2f94b4-a50d-448f-b503-4c2d93a2dbbd
Johnson, Christopher
44098bd2-99c7-4faf-9879-3ee72d94f294
De Boer, Trenton
1b6beff2-7f9f-4d0f-8530-7431d27d9412
Pess, George
b6d1d144-cde1-4d84-9319-11ba8aa2b1ad
Dittman, Andrew
252eef31-e879-4fd5-bfde-133dcb80fb3f
Sear, David
ccd892ab-a93d-4073-a11c-b8bca42ecfd3
Roni, Philip
ed2f94b4-a50d-448f-b503-4c2d93a2dbbd
Johnson, Christopher
44098bd2-99c7-4faf-9879-3ee72d94f294
De Boer, Trenton
1b6beff2-7f9f-4d0f-8530-7431d27d9412
Pess, George
b6d1d144-cde1-4d84-9319-11ba8aa2b1ad
Dittman, Andrew
252eef31-e879-4fd5-bfde-133dcb80fb3f
Sear, David
ccd892ab-a93d-4073-a11c-b8bca42ecfd3

Roni, Philip, Johnson, Christopher, De Boer, Trenton, Pess, George, Dittman, Andrew and Sear, David (2016) Interannual variability in the effects of physical habitat and parentage on Chinook salmon egg-to-fry survival. Canadian Journal of Fisheries and Aquatic Sciences, 73 (7), 1047-1059. (doi:10.1139/cjfas-2015-0372).

Record type: Article

Abstract

Mortality during incubation is believed to be a major factor limiting the recovery of many salmon populations, though direct field measurements of egg-to-fry survival are rare or small in scale. To determine the effects of physical habitat (river reach, fine sediment intrusion, scour), parentage (mating, source of gametes) on Chinook salmon (Oncorhynchus tshawytscha) egg-to-fry survival and developmental stage at emergence across a basin, we constructed 324 artificial redds in nine reaches over 4 years in the Yakima River Basin, Washington, USA. Mean egg-to-fry survival ranged from 49% to 69% annually from 2009 to 2012 brood years. Survival was significantly different among reaches in 2010, but not in 2009, 2011, or 2012, while mating was a significant factor in all years but 2010. In contrast, developmental stage differed significantly among reaches and matings in all 4 years. Percentage of fines, days-in-gravel, and median particle size explained only small (<10%) additional amount of variation in survival or developmental stages. Our results suggest that parentage and reach within a basin are major factors influencing egg-to-fry survival, but their relative influence varies annually, presumably depending on the magnitude of high flows and scour during incubation.

Full text not available from this repository.

More information

Accepted/In Press date: 18 October 2015
Published date: July 2016
Organisations: Earth Surface Dynamics, Southampton Marine & Maritime Institute

Identifiers

Local EPrints ID: 411058
URI: http://eprints.soton.ac.uk/id/eprint/411058
ISSN: 0706-652X
PURE UUID: 9c6e942b-5f8e-4537-b89d-8eaf9280dbff
ORCID for David Sear: ORCID iD orcid.org/0000-0003-0191-6179

Catalogue record

Date deposited: 13 Jun 2017 16:32
Last modified: 17 Dec 2019 02:00

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