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Shasta Trinity National Forest Watershed Vulnerability Assessment, Pacific Southwest Region (R5) Watershed Vulnerability Results Fisheries This assessment considered increase in water temperature considered to be the primary risk to fisheries and fisheries habitat. Fish values were characterized by the density of fish presence with higher weighting for threatened, endangered and sensitive species than for resident species. The result of the analysis for fish is shown in Figure 18. Areas in green contain habitats that may provide greatest resilience, and watersheds in red support habitats that may be the most vulnerable to impacts associated with climate change. Watersheds shown in yellow are considered to have moderate resilience. Figure 18. Combined ratings of resources, stressors and exposure produce relative ratings of watershed vulnerability Investing in fish habitat or watershed improvement projects is expected to be most effective in watersheds with high resilience (green), or moderately resilient watersheds (yellow) adjacent to watersheds with high resilience, because these would provide a greater level of connectivity. Enhancement of connectivity is a vitally important form of restoration in response to climate change. Restoration has traditionally been driven by a combination of political and biological considerations. It is highly important that scarce restoration funds for species recovery be allotted based on a hierarchy that considers resource values and includes long-term sustainability in the face of climate change. Site selection should prioritize areas of high resource value, tempered by considerations of resiliency to climate change. Areas of high resource value would include both population strongholds and habitat that will act as refugia from the change. 202 Assessing the Vulnerability of Watersheds to Climate Change
Shasta Trinity National Forest Watershed Vulnerability Assessment, Pacific Southwest Region (R5) Highest priority actions are habitat protection and improving connectivity and access to existing habitat not currently occupied. Aquatic Species Sensitive aquatic species are represented in the analysis by springs and lentic habitats less than one acre in size. The primary risks to these habitats (and the species they support) are loss of suitability from warming and complete loss due to drying. Resource values were characterized by the density of the small waterbodies. Results of this analysis are displayed in Figure 19. Areas in green are watersheds supporting aquatic habitats that may provide greatest resilience to impacts associated with climate. Watersheds depicted in red are areas where habitats may be the most vulnerable to change. Investing in sensitive aquatic species habitat improvement projects may be most efficient in watersheds that are most resilient, and in watersheds with moderate resilience (yellow) that are adjacent to more resilient watersheds. Developing more reliable water sources and protesting acquisition of additional water rights in may improve resilience in all watersheds, and may help to retain water in small ponds and springs. Figure 19. Vulnerability of small aquatic features to drying 203 Assessing the Vulnerability of Watersheds to Climate Change
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AUTHORS AND CONTRIBUTORS Authors* M
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ASSESSSING THE VULNERABILITY OF WAT
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staff; the task group included repr
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Figure 2. Conceptual model for asse
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Figure 3. Density of springs and sm
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Using Historic Data One finding con
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NF (Region 8) relied on information
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level of uncertainty. Though there
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climate (Casola et al. 2005). Only
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sensitivity. Most were derived from
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The sensitivity evaluation typicall
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in exposure. The result of combinin
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highest priority for management act
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to information affected the assessm
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with and rely on in many resource d
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Pilot National Forest Reports Conte
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Assessment of Watershed Vulnerabili
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Gallatin National Forest Watershed
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Helena National Forest Watershed Vu
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Grand Mesa, Uncompahgre and Gunniso
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White River National Forest Watersh
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Coconino National Forest Watershed
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Chequamegon-‐Nicolet National F
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Chugach National Forest Watershed V
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