Skip to main content
U.S. flag

An official website of the United States government

Lake trout otolith chronologies as multidecadal indicators of high-latitude freshwater ecosystems

December 18, 2012

High-latitude ecosystems are among the most vulnerable to long-term climate change, yet continuous, multidecadal indicators by which to gauge effects on biology are scarce, especially in freshwater environments. To address this issue, dendrochronology (tree-ring analysis) techniques were applied to growth-increment widths in otoliths from lake trout (Salvelinus namaycush) from the Chandler Lake system, Alaska (68.23°N, 152.70°W). All otoliths were collected in 1987 and exhibited highly synchronous patterns in growth-increment width. Increments were dated, the widths were measured, and age-related growth declines were removed using standard dendrochronology techniques. The detrended time series were averaged to generate an annually resolved chronology, which continuously spanned 1964–1984. The chronology positively and linearly correlated with August air temperature over the 22-year interval (p < 0.01), indicating that warmer summers were beneficial for growth, perhaps by increasing fish metabolic rate or lake productivity. Given the broad distribution of lake trout within North America, this study suggests that otolith chronologies could be used to examine responses between freshwater ecosystems and environmental variability across a range of temporal and spatial scales.

Citation Information

Publication Year 2013
Title Lake trout otolith chronologies as multidecadal indicators of high-latitude freshwater ecosystems
DOI 10.1007/s00300-012-1245-9
Authors B.A. Black, Vanessa R. von Biela, Christian E. Zimmerman, Randy J. Brown
Publication Type Article
Publication Subtype Journal Article
Series Title Polar Biology
Index ID 70041483
Record Source USGS Publications Warehouse
USGS Organization Alaska Science Center