2023 Early Hearing Detection & Intervention Conference

March 5-7, 2023 • Cincinnati, OH

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5/23/2019 | 11:30 AM - 11:45 AM | IMPLICATIONS OF CLIMATE CHANGE FOR PHYSICOCHEMISTRY AND RESOURCE AVAILABILITY IN MOUNTAIN STREAMS OF SOUTHEAST ALASKA | 250 AB

IMPLICATIONS OF CLIMATE CHANGE FOR PHYSICOCHEMISTRY AND RESOURCE AVAILABILITY IN MOUNTAIN STREAMS OF SOUTHEAST ALASKA

The Coast Mountains of southeast Alaska contain a diversity of watersheds ranging in elevation from sea level to more than 2500 meters and in landcover from old growth forest to alpine icefields and glaciers. Within this watershed mosaic, landcover and streamwater sources impart distinctive physical and chemical properties to streams that, in turn, structure resource availability and habitat suitability for native and anadramous fish species. In this study, we use a paired watershed approach to evaluate how differences in landcover impact stream physicochemistry. We instrumented two adjoining watersheds, one with glacier ice and perennial snowfields and one dominated by low-elevation forest and wetlands, with stream gages and in-situ water quality sensors to measure the physical properties of streamwater (temperature, conductivity, and DO) over the summer runoff season (May-October). We also collected regular grab samples to evaluate the availability and export of C, N, and P in streamwater and used drift nets to quantify organic and invertebrate drift. Our findings provide insight into the temporal drivers of aquatic resource availability and how mountain streams in southeast Alaska will evolve as glaciers and snowfields continue to be lost.

ClimateChange
Hydrology
Organic Matter

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Presenters/Authors

Eran Hood (), University of Alaska Southeast, ewhood@alaska.edu;