Skip to main content
Advanced Search

Filters: Categories: Publication (X) > partyWithName: Daniel J Isaak (X)

21 results (44ms)   

View Results as: JSON ATOM CSV
Macroscale hydrologic modeling of ecologically relevant flow metrics in small streams, credited to Hamlet, A F, published in 2010. Published in USFS Region 6 annual meeting, Vancouver, WA., in 2010.
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....
Stream hydrology strongly affects the structure of aquatic communities. Changes to air temperature and precipitation driven by increased greenhouse gas concentrations are shifting timing and volume of streamflows potentially affecting these communities. The variable infiltration capacity (VIC) macroscale hydrologic model has been employed at regional scales to describe and forecast hydrologic changes but has been calibrated and applied mainly to large rivers. An important question is how well VIC runoff simulations serve to answer questions about hydrologic changes in smaller streams, which are important habitat for many fish species. To answer this question, we aggregated gridded VIC outputs within the drainage...
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...
Our objective in this study was to conduct additional validations of the VIC model outputs for the region around the Shoshone National Forest by comparing modeled predictions to observed USGS gage data at selected locations. In addition, we compared model performance to that of hydrologic outputs from MC1 (Daly et al. 2000, Bachelet et al. 2001), a dynamic model that simulates vegetation, carbon, hydrology and fire processes.
Warming during the 20th century drove a series of environmental trends that have profound implications for many aspects of salmonid habitat including disturbance regimes, such as wildfire, and unfavorable changes to thermal and hydrologic properties of aquatic systems. As dramatic and extensive as climatic and environmental trends are for salmonid habitats, global climate models (GCMs) project that many of these trends will continue and even accelerate until at least the middle of the 21st century. Clearly, managers of native salmonids in the western United States should consider adjusting management strategies to accommodate a warmer and possibly drier future. Tools are needed to forecast where important changes...
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.
Thermal regimes are fundamental to understanding aquatic ecology, given the ectothermic physiologies of most aquatic organisms. Moreover, significant departures from historical conditions are underway in response to a warming climate (Isaak et al. 2010; Isaak et al. In Review, Kaushal et al. 2010; Rieman and Isaak 2010). Although considerable amounts of stream temperature data are now routinely collected using inexpensive digital temperature sensors, most of these data are collected during summer when temperatures are warmest and access to mountain streams is easiest. This provides a narrow view of thermal regimes in streams and misses ecologically relevant information about the date of spring onset, growing season...
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.
The Potential Influence of Changing Climate on the Persistence of Riverine Fishes: How do managers use science information to build adaptation strategies for the future?, credited to Williams, J.E., published in 2010. Published in Programme FSBI 2010 Queen’s University Belfast - Fish and Climate Change – 26-30 July 2010, on pages 7 - 7, 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.
Seasons other than summer: the need for annual stream temperature data, credited to Isaak, Daniel J., published in 2010. Published in Idaho American Fisheries Society Meeting. Pocatello, ID., 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.