Indirect changes in fish assemblages due to increases in ...

Indirect changes in fish assemblages due to increases in ...

INDIRECT CHANGES IN FISH ASSEMBLAGES DUE TO INCREASES IN ARCTIC RIVER DISCHARGE Cody Dawson 28 November 2017 Marine Science The Arctic Is Being Impacted By Climate Change

NASA Arctic River Discharge Has Increased Sagavanirktok River Eurasian rivers most heavily impacted (Peterson et al 2002) North American rivers seeing more pronounced effects

recently (McClelland et al. 2014) Combination of pluvial and glacial water sources Arctic River Discharge Has Increased Increased River Discharge Could Switch Trophic Balance

Brings organic and inorganic nutrients to coastal zone Some areas have seen doubling in phytoplankton productivity (Wikner & Andersson 2012) McClelland et al. 2014 Objectives

1. Delineate Sag, Lower Colville, and Kuparuk watersheds 2. Identify streams and major rivers in watersheds 3. Identify streams containing known anadromous fish populations 4. Calculate accurate river discharge to locate areas of coastal nutrient loading Colville River McClelland et al. 2014

Mean Discharge (thousands of ft3s-1) 50000 45000 40000 Sag Colville Kuparuk

35000 30000 25000 20000 15000 10000 5000 0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Discharge from USGS gages in 2016 Mean Discharge (thousands of ft3s-1) 50000 45000 40000 Sag

Colville Kuparuk 35000 30000 25000 20000 15000 10000 5000

0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Discharge from USGS gages in 2016 Whats Left This Project: Dolly Varden 1. Find more resolute DEM for discharge 2. Identify stream outlets with potential for nutrient loading

Future Endeavors: 3. Add catch data from summer sampling 4. Try and develop model using GIS to predict where fish might move to (Joy & Death 2004) Broad Whitefish Arctic Grayling STORY MAP?

Questions?

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