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We measured water temperature at 87 sites in six streams in two different years (1998 and 1999) to test for association with the occurrence of Lahontan cutthroat trout Oncorhynchus clarki henshawi. Because laboratory studies suggest that Lahontan cutthroat trout begin to show signs of acute stress at warm (>22°C) temperatures, we focused on the maximum daily temperature. The maximum daily temperature associated with the occurrence of Lahontan cutthroat trout ranged from 18.9°C to 28.5°C. Occurrence was more likely at colder (<26°C) sites. In two streams, the maximum daily temperature associated with the occurrence of these trout was relatively cool (≤20°C). In these streams, the response to temperature may...
Mountain streams provide important habitats for many species, but their faunas are especially vulnerable to climate change because of ectothermic physiologies and movements that are constrained to linear networks that are easily fragmented. Effectively conserving biodiversity in these systems requires accurate downscaling of climatic trends to local habitat conditions, but downscaling is difficult in complex terrains given diverse microclimates and mediation of stream heat budgets by local conditions. We compiled a stream temperature database (n = 780) for a 2500-km river network in central Idaho to assess possible trends in summer temperatures and thermal habitat for two native salmonid species from 1993 to 2006....
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Abstract Unpaved forest roads remain a pervasive disturbance on public lands and mitigating sediment from road networks remains a priority for management agencies. Restoring roaded landscapes is becoming increasingly important for many native coldwater fishes that disproportionately rely on public lands for persistence. However, effectively targeting restoration opportunities requires a comprehensive understanding of the effects of roads across different ecosystems. Here, we combine a review and a field study to evaluate the status of knowledge supporting the conceptual framework linking unpaved forest roads with streambed sediment. Through our review, we specifically focused on those studies linking measures of...
Stream thermal regimes and aquatic ecosystems in a changing climate, credited to Luce, Charles H., published in 2009. Published in Western Watersheds and Climate Change Workshop. Boulder, CO. November 17 – 19., in 2009.
Temperature, flow regime and biotic interactions determine differential responses of four trout species to projected climate change (In preparation), credited to Dauwalter, M.M., published in 2011.
Past and Future Effects of Climate Change on Stream Thermal Regimes, credited to Luce, Charles H., published in 2010. Published in USFS Region 1 and 6 annual meetings. Vancouver, Washington and Missoula, MT., in 2010.
Anthropogenic climate change is rapidly altering aquatic ecosystems across the Rocky Mountain West and may detrimentally impact populations of sensitive species that are often the focus of conservation efforts. The objective of this report is to synthesize a growing literature on these topics to address the following questions: (1) What is changing in climate and related physical/hydrological processes that may influence aquatic species and their habitats? (2) What are the implications for fish populations, aquatic communities, and related conservation values? (3) What can we do about it? In many instances, proactive efforts may help populations adapt to climate change; but elsewhere, transitions of aquatic ecosystems...
Most climate change research has focused on threats to native species, but non-native, invasive species may be impacted as well. We show that warmer temperatures and shifts from snowmelt runoff regimes to mixed runoff regimes in parts of the Northern Rocky Mountains, US, may reduce the occurrence of nonnative brook trout (Salvelinus fontinalis) and indirectly benefit the native cutthroat trout (Oncorhynchus clarkii). Differences in reproductive strategy may account for the differential responses of the two species. We base these findings on models of species occurrence that use landscape and climatic variables as predictors and are built from a database of >4000 fish collection points. We estimate changes in stream...
Native and invasive trout distributions in the Upper Columbia Basin under climate change: influence of flow regime, temperature and biotic interaction, credited to Hamlet, A F, published in 2010. Published in Idaho State University, Pocatello, ID. February 4, 2010, in 2010.
Adapting the VIC hydrologic model to headwater streams in the West, credited to Hamlet, A F, published in 2009. Published in US Forest Service Western Watersheds and Climate Change Workshop, Boulder, CO. November 18, 2009, in 2009.
Effects of Climate Change on Stream Temperatures and Hydrologies: Ongoing Patterns and Emerging Tools for Predicting Change, credited to Luce, Charles H., published in 2010. Published in USFS Region 4 annual meeting. Ogden, UT., in 2010.
Flow regime influences distributions of brook trout, bull trout and cutthroat trout in the Upper Columbia Basin, credited to Hamlet, A F, published in 2010. Published in Idaho Chapter of the American Fisheries Society Annual Meeting, Pocatello, ID. March 5, 2010, in 2010.
Effects of climate change on native and introduced trout in the Columbia River Basin, credited to Nagel, David E., published in 2010. Published in Interior Columbia Basin Interagency Deputy Team Meeting. Spokane, WA. December 7, 2010, in 2010.
Challenges for conserving and managing headwater aquatic ecosystems under a changing climate, credited to Luce, Charles H., published in 2010. Published in USFS Region 6 annual meeting. Vancouver, Washington, in 2010.
Collecting, organizing, and applying stream temperature data, credited to Luce, Charles H., published in 2009. Published in Western Watersheds and Climate Change Workshop. Boulder, CO. November 17 – 19., in 2009.
Role of climate and invasive species in structuring trout distributions in the Interior Columbia Basin (In revision), credited to Dunham, J.B., published in 2011. Published in Canadian Journal of Fisheries and Aquatic Resources, in 2011.
Conservation biologists often face the trade-off that increasing connectivity in fragmented landscapes to reduce extinction risk of native species can foster invasion by non-native species that enter via the corridors created, which can then increase extinction risk. This dilemma is acute for stream fishes, especially native salmonids, because their populations are frequently relegated to fragments of headwater habitat threatened by invasion from downstream by 3 cosmopolitan non-native salmonids. Managers often block these upstream invasions with movement barriers, but isolation of native salmonids in small headwater streams can increase the threat of local extinction. We propose a conceptual framework to address...
    map background search result map search result map Linkages between unpaved forest roads and streambed sediment: why context matters in directing road restoration Linkages between unpaved forest roads and streambed sediment: why context matters in directing road restoration