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Recovery and Management Options for Spring/Summer Chinook Salmon in the Columbia River Basin
Peter Kareiva,1Michelle Marvier,2Michelle McClure1*
Construction of four dams on the lower Snake River (in
northwestern United States) between 1961 and 1975 altered salmon
spawninghabitat, elevated smolt and adult migration mortality, and
contributedto severe declines of Snake River salmon populations. By
applyinga matrix model to long-term population data, we found that (i)dam passage improvements have dramatically mitigated direct mortalityassociated with dams; (ii) even if main stem survival were elevatedto
100%, Snake River spring/summer chinook salmon (Oncorhynchustshawytscha) would probably continue to decline toward extinction;and (iii) modest reductions in first-year mortality or estuarinemortality would reverse current population declines.
1 National Marine Fisheries Service,
Northwest Fisheries Science Center, 2725 Montlake Boulevard East,
Seattle, WA 98112, USA.
2 Department of Biology,
Santa Clara University, Santa Clara, CA 95053, USA.
*
To whom correspondence should be addressed. E-mail:
Michelle.Mcclure{at}noaa.gov
The editors suggest the following Related Resources on Science sites:
In Science Magazine
LETTERS
Jeremy Collie, Saul Saila, Carl Walters, Stephen Carpenter;, Charles C. Mann, and Mark L. Plummer (3 November 2000) Science290 (5493), 933c.
[DOI: 10.1126/science.290.5493.933c] |Full Text »
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