2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
6/08/2017 | 10:15 AM - 10:30 AM | MEASURING LONG-TERM CUMULATIVE EFFECTS ON THE SPATIAL AND TEMPORAL DYNAMICS OF RIVERINE SYSTEMS | 301B
MEASURING LONG-TERM CUMULATIVE EFFECTS ON THE SPATIAL AND TEMPORAL DYNAMICS OF RIVERINE SYSTEMS
Environmental assessment procedures lack approaches for long-term evaluation of ecosystems. Management of riparian zones, in particular, has changed greatly over the past 90 years. This work aims to characterize long-term spatio-temporal changes in heterogeneity of stream reaches and riparian zones. Using historical aerial photography spanning eight decades, we examined the Skeena river system in northwestern British Columbia, Canada, an important spawning route for Oncorhynchus tshawytscha (Chinook salmon). We conducted manual air photo interpretation to quantify changes in stream reach type and riparian zone disturbances at multiple years from 1937 to 2015. We characterized changes in reaches with contrasting levels of disturbance over multiple time periods and compared disturbance patterns using spatial pattern metrics, including measures of spatial autocorrelation. We also correlated long-term changes in fish habitat with historical Chinook salmon spawner abundance data. Due to ever-increasing development pressures in Northern Canada and the changing milleu of environmental assessment globally, such approaches can form a key component of rigorous quantification of cumulative effects.
- C14 Hydroecology
- C34 Science and Policy
- S16 Understanding and mitigating change in freshwater ecosystem services
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Presenters/Authors
Karly Harker
(), University of British Columbia, harkerkj@gmail.com;
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