Reconstructing salmon p...( information by comparing records of co...)

Reconstructing salmon populations

information by comparing records of commercial salmon catch numbers with the tree core samples, and then filled in the gaps for the missing human records of salmon populations.

"These reconstructions follow the general ups and downs of historical catch records, but we need to better understand the relationship between tree-ring growth and salmon before we can say this method is accurate." said Drake.

Another method which Naiman and others are currently looking into involves the measurement of nitrogen in tree rings. As the salmon decay, a particular type of nitrogen can be detected in soils and leaves near streams. These nitrogen isotopes have been measured in previous studies and found to relate to the massive deaths following spawning salmon.

According to Naiman, "Measuring nitrogen isotopes in tree rings is potentially more accurate, although much harder to determine."

'"/>

Contact: Annie Drinkard
annie@esa.org
Ecological Society of America
5-Dec-2002

Page: 1 2
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