2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/23/2019 | 10:00 AM - 10:15 AM | BENTHIC PRIMARY PRODUCTION IN MOUNTAIN LAKES: GRADIENTS VERSUS LOCAL FACTORS | 250 AB
BENTHIC PRIMARY PRODUCTION IN MOUNTAIN LAKES: GRADIENTS VERSUS LOCAL FACTORS
Mountain lakes exist along strong environmental gradients, yet local mosaic factors may modify the effects of these environmental gradients on within-lake processes. In particular, the impacts of climate change may be modified by local factors in unpredictable ways, which may disrupt the functioning of these high elevation climate refugia. We tested the influence of localized mosaic factors and large-scale gradients on benthic primary productivity in 12 lakes across two mountain ranges, the Cascade and Olympic Mountains. Lakes ranged in elevation (1300-1640 m), surface area (<1-18 ha), maximum depth (4-18 m), and catchment slope (5-62%). At each lake, we chose rocks of uniform size and incubated them in light and dark chambers for two hours at peak sunlight. Oxygen sensors were placed inside the chambers to measure dissolved oxygen concentrations either over the entire experiment duration or at the beginning and end. We found that benthic primary productivity was affected by a combination of large-scale gradient factors, such as elevation and temperature, and localized variation, such as catchment properties. Understanding how ecosystem processes in mountain systems are affected by climate will be critical for the future.
- Primary Production
- Lentic
- Landscape
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Presenters/Authors
Angela Strecker
(), Portland State University, strecker@pdx.edu;
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Ariana Chiapella
(), Portland State University, ac23@pdx.edu;
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Steven Fradkin
(), National Parks Service, steven_fradkin@nps.gov;
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