Skip to main content

The importance of measuring biotic and abiotic factors in the lower egg pocket to predict coho salmon egg survival

Buy Article:

$48.00 plus tax (Refund Policy)

Abstract:

Based on results from simulated redds of coho salmon Oncorhynchus kisutch, the amount of fine sediment <0·5 mm in the lower half of the egg pocket, rather than the entire egg pocket of the redd, was a strong predictor of egg survival to hatching ( r2 = 0·62). The relationship was much stronger than observed in other studies, which typically ignore egg pocket structure. Abundance of a fish egg-eating worm, Haplotaxis ichthyophagous, an oligochaete that may have been attracted to fine sediment and dead eggs in the egg pocket, was also associated with a decrease in egg survival. The worm, however, accounted for little of the variance in survival compared to fine sediment. Only 10% fine sediment (<0·5 mm) in the lower pocket was required to decrease survival from 100 to 5%. Other abiotic factors had weaker (gravel permeability) or non-existent (dissolved oxygen) correlations with survival.

Keywords: dissolved oxygen; egg pocket; fine sediment; permeability; simulated redd; worms

Document Type: Regular Paper

DOI: http://dx.doi.org/10.1046/j.1095-8649.2003.00039.x

Affiliations: Department of Botany, P. O. Box 3165, University of Wyoming, Laramie, Wyoming 82071, U.S.A.

Publication date: March 1, 2003

bsc/jfb/2003/00000062/00000003/art00003
dcterms_title,dcterms_description,pub_keyword
6
5
20
40
5

Access Key

Free Content
Free content
New Content
New content
Open Access Content
Open access content
Subscribed Content
Subscribed content
Free Trial Content
Free trial content
Cookie Policy
X
Cookie Policy
ingentaconnect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more