thumbnail

Species and life-history affects the utility of otolith chemical composition to determine natal stream-of-origin in Pacific salmon

Transactions of the American Fisheries Society

By:
, , ,
DOI: 10.1080/00028487.2013.811102

Links

Abstract

To test the utility of otolith chemical composition as a tool for determining the natal stream of origin for salmon, we examined water chemistry and otoliths of juvenile and adult Chum Salmon Oncorhynchus keta and Coho Salmon O. kisutch from three watersheds (five rivers) in the Norton Sound region of Alaska. The two species are characterized by different life histories: Coho Salmon rear in freshwater for up to 3 years, whereas Chum Salmon emigrate from freshwater shortly after emergence. We used laser ablation (LA) inductively coupled plasma (ICP) mass spectrometry (MS) to quantify element: Ca ratios for Mg, Mn, Zn, Sr, and Ba, and we used multicollector LA-ICP-MS to determine 87Sr:86Sr ratios in otolith regions corresponding to the period of freshwater residence. Significant differences existed in both water and otolith elemental composition, suggesting that otolith composition could be used to discriminate the natal origin of Coho Salmon and Chum Salmon but only when 87Sr:86Sr ratios were included in the discriminant function analyses. The best discriminant model included 87Sr:86Sr ratios, and without 87Sr:86Sr ratios it was difficult to discriminate among watersheds and rivers. Classification accuracy was 80% for Coho Salmon and 68% for Chum Salmon, indicating that this method does not provide sufficient sensitivity to estimate straying rates of Pacific salmon at the scale we studied.

Geospatial Extents

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Species and life-history affects the utility of otolith chemical composition to determine natal stream-of-origin in Pacific salmon
Series title:
Transactions of the American Fisheries Society
DOI:
10.1080/00028487.2013.811102
Volume
142
Issue:
5
Year Published:
2013
Language:
English
Publisher:
Taylor & Francis
Contributing office(s):
Alaska Science Center
Description:
11 p.
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Transactions of the American Fisheries Society
First page:
1370
Last page:
1380
Number of Pages:
11
Country:
United States
State:
Alaska
Other Geospatial:
Norton Sound