2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/21/2018 | 2:15 PM - 2:30 PM | TROUT RECOVERY IN A RESTORED RIVER: COMBINING METAL BURDEN AND STABLE ISOTOPE APPROACHES | 420 A
TROUT RECOVERY IN A RESTORED RIVER: COMBINING METAL BURDEN AND STABLE ISOTOPE APPROACHES
Coincident patterns of trout abundance and severity of metal-contamination along the Upper Clark Fork River (UCFR) in Montana, USA, have generated concern among restoration practitioners and questioned the underlying causes of longitudinal decreases in fish density. Approximately 200-300 trout/km are present in highly polluted headwaters of the river while only 20-30 trout/km are routinely captured in the least contaminated sections of the UCFR. In this study, nuisance algal growth and warm temperatures during base flow conditions are evaluated as additional factors hindering full recovery of trout populations. Historical records of benthic algae and invertebrate densities follow similar trends, but longitudinal changes in filamentous algae (50-150 g AFDM/m2) suggest different patterns in primary productivity with influence on invertebrate community composition. Recent modelling efforts combining metal body burdens (Cu, As, Zn, Pb, Cd), 13C and 15N signatures, and fish gut content analysis are employed to assess trophic structure in the UCFR under varying conditions of water temperature and algal production. Preliminary results show longer food chain length during summer algal blooms emphasizing the need to address trophic interaction between trout and prey populations in the context of algal influences on metal contaminants
- Algae
- Restoration
- Metal
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Presenters/Authors
Marc Peipoch
(), Stroud Water Research Center, mpeipoch@stroudcenter.org;
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Kimberly Bray
(), University of Montana, kimberly.bray@umconnect.umt.edu;
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H. Maurice Valett
(), University of Montana, Division of Biological Sciences, maury.valett@umontana.edu;
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