Large portions of anadromous salmonid habitat in the western United States has been lost because dams and other blockages. This loss potential to affect evolution through natural selection if is biased, affecting certain types differentially, phenotypic traits correlated with those are heritable. Habitat can also indirectly, by reducing genetic variation changing its distribution within among populations. In this paper, we compare characteristics habitats currently accessible review...

Abstract A pressing question for managing recovery of depressed or declining species is: Can habitat restoration increase resilience to climate change? We addressed this salmon populations with varying life histories, where is defined as maintaining increasing population size despite change effects. Previous studies indicate that several interrelated mechanisms may influence change, including improving either capacity productivity, and ameliorating effects on flood flow, low stream...

Summary 1. A key element of conservation planning is the extremely challenging task estimating likely effect restoration actions on population status. To compare relative benefits typical habitat Pacific salmon ( Oncorhynchus spp.), we modelled response an endangered Columbia River Chinook O. tshawytscha ) to changes in characteristics either targeted for or with potential be degraded. 2. We applied a spatially explicit, multiple life stage, Beverton‐Holt model evaluate how set variables...

Abstract Aquatic species are threatened by climate change but have received comparatively less attention than terrestrial species. We gleaned key strategies for scientists and managers seeking to address in aquatic conservation planning from the literature existing knowledge. 3 categories of effort that rely on scientific analysis particular application under U.S. Endangered Species Act (ESA): assessment overall risk a species; long‐term recovery planning; evaluation effects specific actions...

Wild and hatchery‐reared 8–12‐month‐old (5–8 cm) trout, Salmo frurta L., were stocked in tributaries of the River Gudenb. Mortality was examined by means electrofishing. Repeated electrofishing handling caused a small increase mortality. The daily instantaneous mortality rate Z high during first 2 months after stocking, ranging from 0.0070 for wild trout to 0.0326 domestic at stocking density one per m 0.0206 (wild trout) 0.0888 (domestic two . Two decreased drastically 0.0007 0.0067 trout)....

An investigation into the causes of species decline should include examination habitats important for multiple life stages. Integrating habitat impacts across stages with life-cycle models (LCMs) can reveal impairments inhibiting recovery and help guide restoration efforts. As part final elements Habitat Restoration Planning model (HARP; Beechie et al. this volume), we developed LCMs four populations three anadromous salmonids ( Oncorhynchus kisutch , O . tshawytscha mykiss ), ran diagnostic...

Summary 1. Conservation planning is often hampered by the lack of causal quantitative links between landscape characteristics, restoration actions and habitat conditions that impact status imperilled species. Here we present a first step toward linking on to population endangered stream‐type Chinook salmon ( Oncorhynchus tshawytscha ). 2. We developed relationships land use, characteristics freshwater spring in Wenatchee River basin. Available data allowed us find described water...

CR Climate Research Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsSpecials 71:127-137 (2016) - DOI: https://doi.org/10.3354/cr01434 Assessing freshwater life-stage vulnerability of an endangered Chinook salmon population climate change influences on stream habitat Jon M. Honea1,4,*, Michelle McClure2, Jeffrey C. Jorgensen1,5, Mark D. Scheuerell3 1Conservation Biology Division, Northwest Fisheries Science...

For species of conservation concern, an essential part the recovery planning process is identifying discrete population units and their location with respect to one another. A common feature among geographically proximate populations that number organisms tends covary through time as a consequence similar responses exogenous influences. In turn, high covariation can threaten persistence larger metapopulation. Historically, explorations covariance in size many (>10) series have been...

In the western United States, long-term recovery of many Pacific salmon populations is inextricably linked to freshwater habitat quality. Industrial activities from past century have left a legacy pollutants that persist, particularly near working waterfronts. The adverse impacts these contaminants on health been studied for decades, but population-scale consequences chemical exposure salmonids are still poorly understood. We estimated acute and delayed mortality rates seaward migrating...

Wild and hatchery‐reared 8–12‐month‐old (5–8 cm) trout, Salmo truttu L., were stocked into tributaries of the River Gudená. Movements examined by means electrofishing. Overall dispersal upstream movement greater for wild trout than domestic trout. Maximum distance was 600 m both strains downstream 700 Upstream started within 2 months from stocking continued at least 4 months. Downstream during first few days after stocking, more pronounced

Stream temperatures in the Pacific Northwest are projected to increase with climate change, placing additional stress on cold-water salmonids. We modeled potential impact of increased stream four anadromous salmonid populations Chehalis River Basin (spring-run and fall-run Chinook salmon Oncorhynchus tshawytscha, coho O. kisutch, steelhead mykiss), as well for floodplain reconnection shade restoration offset effects future temperature increases. In Basin, peak summer predicted by much 3°C...

Abstract Differences in the life history pathways (LHPs) of juvenile animals are often associated with differences demographic rates later stages. For migratory animals, different LHPs result from same population occupying distinct habitats subjected to environmental drivers. Understanding how differ among expressing may reveal fitness trade‐offs that drive expression alternative and enable better prediction dynamics a changing environment. To understand outcomes their relationships...

Landlocked Lake Superior sea lampreys (Petromyzon marinus) cause a significant but uncertain amount of mortality on host species. We used lamprey bioenergetics model to examine the scope sizes vulnerable death as consequence feeding and incorporated bimodal lake-ward migration parasitic lampreys. At their peak rate maximum size (P = 1.0, proportion consumption), spring migrants were capable killing lean lake trout (Salvelinus namaycush) hosts ≤ 2.0 kg, which was larger than fall (1.8 kg)....

Abstract Significant challenges remain in the ability to estimate habitat change under combined effects of natural variability, climate change, and human activity. We examined anticipated on shallow water over low‐sloped beaches these lower Willamette River, Oregon, an area highly altered by development. A proposal stabilize some shoreline with large rocks (riprap) would alter areas, important for threatened Chinook salmon (Oncorhynchus tshawytscha), be subject U.S. Endangered Species...

In the Pacific Northwest, USA, climate change is expected to result in a shift average hydrologic conditions and increase variability. The relative vulnerabilities peak flow changes among salmonid species within same basin have not been widely evaluated. We assessed impacts of predicted increases flows on four populations Chehalis River basin. Coupling observations flows, emissions projections, multi-stage Beverton–Holt matrix-type life cycle models, we ran 100-year simulations spawner...

Fish community objectives for Lake Superior call restoration such that it resembles its historical species composition, to the extent possible, yet allow supplementation of naturalized Pacific salmonids (Oncorhynchus spp.). To achieve these goals, managers strive control sea lamprey (Petromyzon marinus) levels cause insignificant (<5%) mortality host species. While efforts have been successful, size has increased during period. We analyzed long-term trends and found a significant increase...

Life history diversity can significantly affect population dynamics and effects of management actions. For instance, variation in individual responses to environmental variability reduce extirpation risk populations, as the portfolio effect dampens temporal abundance. Moreover, differences habitat use may cause individuals respond differently climate variability. To explore role life trajectories, models need incorporate within-population variation. Integrated modeling (IPM) is a approach...