skip to main content

DOE PAGESDOE PAGES

Title: Endangered winter-run Chinook salmon rely on diverse rearing habitats in a highly altered landscape

Protecting habitats for imperiled species is central to conservation efforts. However, for migratory species, identifying juvenile habitats that confer success requires tracking individuals to reproduction. Here in this paper, we used otolith strontium isotope ratios ( 87Sr/ 86Sr) to reconstruct juvenile habitat use by endangered Sacramento River winter-run Chinook salmon that survived to adulthood. The isotope data revealed that 44–65% of surviving adults reared in non-natal habitats, most of which is not designated as critical habitat under the Endangered Species Act. Juveniles entered these non-natal habitats at small sizes, yet left freshwater at a similar size to those that reared in the mainstem Sacramento River, suggesting these alternate rearing habitats provide suitable growth conditions. These findings indicate Sacramento River winter-run Chinook salmon rely on rearing habitats across a broader geographic region than previously known, potentially opening up greater restoration and conservation opportunities for species recovery.
Authors:
 [1] ;  [2] ;  [3] ;  [4]
  1. Metropolitan Water District of Southern California, Sacramento, CA (United States)
  2. Univ. of California, Davis, CA (United States). Center for Watershed Sciences
  3. Univ. of California, Davis, CA (United States). Center for Watershed Sciences; National Marine Fisheries Service, Santa Cruz, CA (United States). Southwest Fisheries Science Center
  4. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States). Glenn T. Seaborg Inst.
Publication Date:
Report Number(s):
LLNL-JRNL-739342
Journal ID: ISSN 0006-3207
Grant/Contract Number:
AC52-07NA27344; 2005; P1596028
Type:
Accepted Manuscript
Journal Name:
Biological Conservation
Additional Journal Information:
Journal Volume: 217; Journal Issue: C; Journal ID: ISSN 0006-3207
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; 59 BASIC BIOLOGICAL SCIENCES; California Central Valley; Habitat use; Non-natal habitat; Sacramento-San Joaquin River Delta; Critical habitat; Otolith chemistry
OSTI Identifier:
1418922