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Multi-scale drivers of ecosystem production in the Salmon Trout River

Multi-scale drivers of ecosystem production in the Salmon Trout River

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<strong>Multi</strong>-<strong>scale</strong> <strong>drivers</strong> <strong>of</strong> <strong>ecosystem</strong><strong>production</strong> <strong>in</strong> <strong>the</strong> <strong>Salmon</strong> <strong>Trout</strong> <strong>River</strong>Amy Marcarelli – Michigan TechCasey Huck<strong>in</strong>s – Michigan TechSue Eggert – US Forest Service Nor<strong>the</strong>rn Research Station


0.70.6Brook <strong>Trout</strong>Ra<strong>in</strong>bow <strong>Trout</strong>Coho <strong>Salmon</strong>Mean density (fish/m 2 )0.50.40.30.20.10.0Big Pup CreekCompeau CreekEast Branch HuronLittle Garlic <strong>River</strong>Little Huron <strong>River</strong>Below Gatehouse 3Below Gatehouse 2Sampl<strong>in</strong>g sites<strong>Salmon</strong> <strong>Trout</strong> <strong>River</strong> sitesBelow Gatehouse 1Murphy's Po<strong>in</strong>tBelow Christy Pool 2Below Christy Pool 1Why aresalmoniddensities lower<strong>in</strong> <strong>the</strong> STR than<strong>in</strong> o<strong>the</strong>rregional rivers?


Approach: Primary andsecondary <strong>production</strong> <strong>of</strong>sand vs. rock reachesNet Production (mg O 2/ L / h)Net Production (mg O 2/ L / h)420-2-4630-3-6-9-12Jul Aug SeptBelow Gate HouseRockSandChristy Pool


Future plan: Experimental sand removal?


Approach: Long-term monitor<strong>in</strong>g<strong>of</strong> river<strong>in</strong>e <strong>production</strong>2422Temperature (C)2018161412Dissolved Oxygen (% Saturation)10812011010090807013-Sep06-Sep30-Aug23-Aug16-Aug09-Aug02-Aug26-Jul19-Jul12-Jul05-Jul28-Jun21-Jun14-Jun07-Jun31-May24-May

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