Environmental factors influencing freshwater survival and smolt production in two Pacific Northwest coho salmon (Oncorhynchus kisutch) populations
Lawson, P.W., E.A. Logerwell, N.J. Mantua, R.C. Francis, and V.N. Agostini. 2004. Environmental factors influencing freshwater survival and smolt production in two Pacific Northwest coho salmon (Oncorhynchus kisutch) populations. Canadian Journal of Fisheries and Aquatic Sciences 61:360-373.
Climate variability is well known to affect the marine survival of coho salmon (Oncorhynchus kisutch) in Oregon and Washington. Marine factors have been used to explain up to 83% of the variability in Oregon coastal natural coho salmon recruitment, yet about half the variability in coho salmon recruitment comes from the freshwater life phase of the life cycle. This seeming paradox could be resolved if freshwater variability were linked to climate and climate factors influencing marine survival were correlated with those affecting freshwater survival. Effects of climate on broad-scale fluctuations in freshwater survival or production are not well known.
UW Climate Impacts Group