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Book Influence of Abiotic and Biotic Factors on Abundance of Stream resident Westslope Cutthroat Trout Oncorhynchus Clarki Lewisi in Montana Streams

Download or read book Influence of Abiotic and Biotic Factors on Abundance of Stream resident Westslope Cutthroat Trout Oncorhynchus Clarki Lewisi in Montana Streams written by Bradley Bernard Shepard and published by . This book was released on 1998 with total page 86 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Movement and Population Structure of Westslope Cutthroat Trout  Oncorhynchus Clarki Lewisi  Inhabiting Headwaters Streams in Montana

Download or read book Movement and Population Structure of Westslope Cutthroat Trout Oncorhynchus Clarki Lewisi Inhabiting Headwaters Streams in Montana written by and published by . This book was released on 1998 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Influence of Abiotic and Biotic Factors on Occurrence of Resident Bull Trout in Fragmented Habitats  Western Montana

Download or read book Influence of Abiotic and Biotic Factors on Occurrence of Resident Bull Trout in Fragmented Habitats Western Montana written by Cecil Frank Rich and published by . This book was released on 1996 with total page 106 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Beaverhead Deerlodge National Forest  N F    Grasshopper Fuels Management

Download or read book Beaverhead Deerlodge National Forest N F Grasshopper Fuels Management written by and published by . This book was released on 2004 with total page 504 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Lewis and Clark National Forest  N F    Sheep Creek Range Analysis

Download or read book Lewis and Clark National Forest N F Sheep Creek Range Analysis written by and published by . This book was released on 2004 with total page 386 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Factors Influencing the Distribution of Bull Trout and Westslope Cutthroat Trout West of the Continental Divide in Glacier National Park

Download or read book Factors Influencing the Distribution of Bull Trout and Westslope Cutthroat Trout West of the Continental Divide in Glacier National Park written by Vincent Stephen D'Angelo and published by . This book was released on 2010 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt: The reported decline of native bull trout Salvelinus confluentus and westslope cutthroat trout Oncorhynchus clarkii lewisi populations west of the Continental Divide in Glacier National Park (GNP) prompted research to identify critical habitats and investigate factors influencing their distribution and relative abundance. I evaluated the association of six abiotic factors (stream width, elevation, gradient, large woody debris density, pool density, mean August stream temperature) and a biotic factor (the presence of nonnative lake trout, Salvelinus namaycush) with the occurrence and density of bull trout and westslope cutthroat trout in 79 stream reaches in five sub-drainages of the North Fork Flathead River in GNP. Logistic and linear regression models were used to quantify the influence of these independent variables on species occurrence (presence/absence) and density (age-1 or older fish/100m2), and an information theoretic approach (AICc) was used to determine the most plausible combinations of variables in each case. The occurrence of westslope cutthroat trout was negatively associated with the presence of lake trout and positively associated with large woody debris and water temperature. Westslope cutthroat were detected throughout a wide range of water temperatures (8.5-16oC), stream sizes and elevations, but were most abundant in small, complex streams that were not connected to lakes supporting lake trout. Bull trout occurrence was positively related to stream width and negatively related to channel gradient and water temperature. Bull trout were most abundant in narrow (

Book Canadian Journal of Fisheries and Aquatic Sciences

Download or read book Canadian Journal of Fisheries and Aquatic Sciences written by and published by . This book was released on 2006 with total page 516 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Behavioral  Ecological  and Fitness Consequences of Hybridization Between Native Westslope Cutthroat Trout  Oncorhynchus Clarkii Lewisi  and Nonnative Rainbow Trout  O  Mykiss

Download or read book Behavioral Ecological and Fitness Consequences of Hybridization Between Native Westslope Cutthroat Trout Oncorhynchus Clarkii Lewisi and Nonnative Rainbow Trout O Mykiss written by Clint Cain Muhlfeld and published by . This book was released on 2008 with total page 264 pages. Available in PDF, EPUB and Kindle. Book excerpt: Anthropogenic hybridization is one of the greatest threats to global biodiversity. Hybridization and introgression may lead to a loss of locally adapted gene complexes and ecological adaptations in native populations, yet these potential consequences have not been fully evaluated in nature. I investigated factors influencing the spread of hybridization between native westslope cutthroat trout (Oncorhynchus clarkii lewisi) and nonnative rainbow trout (O. mykiss) in the upper Flathead River system, Montana (USA) and British Columbia (Canada). The fundamental questions of my dissertation were: what are the behavioral, ecological, and fitness consequences of hybridization and what factors influence successful invasion of hybrids? First, I assessed the patterns of spawning between parental species and their hybrids and found that hybridization alters the spawning behavior of migratory westslope cutthroat trout, and is spreading via long distance dispersal of hybrids from downstream sources and some temporal overlap during spawning. Second, I describe for the first time how a wide range of levels of nonnative admixture affect fitness of cutthroat trout in the wild by estimating reproductive success in a recently invaded stream using parentage analysis with multilocus microsatellite markers. Small amounts of hybridization markedly reduced reproductive success, with fitness exponentially declining by ~50% with 20% nonnative genetic admixture. Finally, I evaluated the association of local-habitat features, landscape characteristics, and biotic factors with the spread of hybridization in the system, and found that hybridization increases in streams with warmer water temperatures, high land use disturbance and close proximity to the source of hybridization; however, none of these factors appeared sufficient to prevent further spread. These combined results suggest that hybrids are not only genetically different than westslope cutthroat trout but also have reduced fitness and are ecologically different, and that hybridization is likely to continue to spread if hybrid populations with high amounts of rainbow trout admixture are not reduced or eliminated. I conclude that extant aboriginal cutthroat trout are at greater conservation risk due to hybridization than previously thought and policies that protect hybridized populations need reconsideration.

Book Influence of Stream Size and Morphology on the Seasonal Distribution and Habitat Use of Resident Bull Trout and Westslope Cutthroat Trout in Western Montana

Download or read book Influence of Stream Size and Morphology on the Seasonal Distribution and Habitat Use of Resident Bull Trout and Westslope Cutthroat Trout in Western Montana written by Michael J. Jakober and published by . This book was released on 1994 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Understanding the Importance of Intermittently Fragmented Stream Habitat for Isolated Westslope Cutthroat Trout  Oncorhynchus Clarki Lewisi  in the Colville National Forest Washington

Download or read book Understanding the Importance of Intermittently Fragmented Stream Habitat for Isolated Westslope Cutthroat Trout Oncorhynchus Clarki Lewisi in the Colville National Forest Washington written by and published by . This book was released on 2016 with total page 107 pages. Available in PDF, EPUB and Kindle. Book excerpt: Climate change and anthropogenic effects have vastly reduced Westslope Cutthroat Trout (Oncorhynchus clarki lewisi, WCT) habitat throughout their range, including the Colville National Forest in northeastern Washington where this study was conducted. Many native salmonid populations have declined in abundance since the early 1900s due to a variety of climate- and human-driven forces. Westslope Cutthroat Trout are especially sensitive to habitat loss or degradation and to climate change. Together, climate change, habitat degradation, and non-native salmonid invasions are contributing to increasingly fragmented WCT populations. Ongoing and predicted future warming trends are expected to further fragment these populations and isolate them in headwater stream reaches, with populations in the spatial margins of their distributions facing greater risk. Native salmonid populations are often separated or isolated by natural or artificial upstream migration barriers (i.e., waterfalls, culverts, etc.). Prior to continuing conservation and management actions targeting WCT, it is imperative to understand habitat requirements of this keystone species in fragmented areas. Field survey data were collected in the summer of 2015 on channel geomorphic characteristics and WCT presence/absence in 26 streams located in the Colville National Forest. A clear spatial separation was observed between Eastern Brook Trout (Salvenius fontinalis, EBT) and WCT above four culvert road crossings and the habitat in both of these areas was compared statistically to identify explicit differences. Logistic regression analysis indicated that the presence of isolated WCT populations was primarily positively associated with an increase in large wood and boulders, and negatively associated with increasing gravel, bedrock, habitat unit length, depth, and width. The final model correctly predicted 37.5% of isolated WCT presence observations and 96.5% of the WCT/EBT presence observations significantly better than by chance alone. This model, in fact, may be useful in identifying limited habitat due to the fragmented nature of the channel units supporting IWCT. Large wood and boulders were positively correlated to WCT presence, likely because both are important in the formation of pools and cascades. Channel unit length, width, depth, active channel width as well as gravel and bedrock substrates, were all negatively associated with WCT presence. This suggests that isolated WCT are primarily associated with small headwater cascades with complex shelter, which may provide greater thermal and predation refuge compared to shallow glide or large pool habitats. Overall, I concluded that differences in stream habitat above and below blocking culverts are not driving Westslope Cutthroat Trout distributions in the study area due to confounding factors such as the presence of problematic barriers and small sample size. I also conclude that future conservation and management decisions specific to WCT should prioritize complex cascade habitat in headwater stream reaches because of the type and quantity of habitat they may provide, especially during severe drought or low flow conditions.

Book The Present Status and Distribution of the Westslope Cutthroat Trout  Salmo Clarki Lewisi  East and West of the Contenental Divide in Montana

Download or read book The Present Status and Distribution of the Westslope Cutthroat Trout Salmo Clarki Lewisi East and West of the Contenental Divide in Montana written by George A. Liknes and published by . This book was released on 1984 with total page 163 pages. Available in PDF, EPUB and Kindle. Book excerpt: Exerpt From Abstract: "The distribution and abundance of westslope trout (Salmo clarki lewisi) has drastically declined over its historic range in the last 100 years. Although previous studies in Montana have identified strongholds, the status of westslope cutthroat statewide continued to be an uncertainty. The purpose of this report was to quantitatively determine the present and historic range as well as identify strongholds of genetically pure westlopw cutthroat in Montana... Statewide, 259 lakes contain or are believed to contain westslope cutthroat populations. Six percent are known to contain genetically pure populations. Fifteen of the 16 pure populations are found within Glacier National Park; the other population is located on the Flathead Indian Reservation. Only 4 lakes or reservoirs east of the continental divide were found to contain westslope populations."

Book Thermal Adaptation of Westslope Cutthroat Trout Oncorhynchus Clarkii Lewisi

Download or read book Thermal Adaptation of Westslope Cutthroat Trout Oncorhynchus Clarkii Lewisi written by Daniel Patrick Drinan and published by . This book was released on 2010 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt: Understanding local adaptations is a fundamental goal of evolutionary biology and would provide managers information necessary to better protect and conserve species. Salmonids are a particularly useful system for studying local adaptations as they often persist in disparate and isolated environments. In addition, their sensitivity to temperature provides a likely candidate for natural selection to act. I studied thermal adaptation in four wild populations and one hatchery stock of westslope cutthroat trout. Native stream mean summer temperatures ranged from 6.7° to 11.2°C. Embryos were collected from the wild and differences in embryonic development, embryonic survival, and juvenile growth were measured. I found a significant relationship between median embryonic survival and native stream temperatures at warm incubation temperatures (Rank test; P = 0.04). The change in embryonic survival across incubation temperatures was consistent for populations from warm streams, but changed drastically for populations from cool streams. This difference suggests that populations from warmer streams may be thermal generalists, and populations from cooler streams may be thermal specialists. Results have both short- and long-term implications. In the short-term, managers should use these data to support the consideration of local adaptations when performing translocation projects. In the long-term, these data suggest that global climate change may be detrimental for westslope cutthroat trout.

Book Conservation Agreement and Management Plan for Westslope Cutthroat Trout  Oncorhynchus Clarki Lewisi  in Montana

Download or read book Conservation Agreement and Management Plan for Westslope Cutthroat Trout Oncorhynchus Clarki Lewisi in Montana written by Montana. Department of Fish, Wildlife, and Parks and published by . This book was released on 1999 with total page 23 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Memorandum of Understanding and Conservation Agreement for Westslope Cutthroat Trout  Oncorhynchus Clarki Lewisi  in Montana

Download or read book Memorandum of Understanding and Conservation Agreement for Westslope Cutthroat Trout Oncorhynchus Clarki Lewisi in Montana written by Montana. Department of Fish, Wildlife, and Parks and published by . This book was released on 1999 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Population Dynamics and Demographics of Westslope Cutthroat Trout Oncorhynchus Clarki Lewisi Inhabiting Isolated Headwater Tributaries of Montana

Download or read book Population Dynamics and Demographics of Westslope Cutthroat Trout Oncorhynchus Clarki Lewisi Inhabiting Isolated Headwater Tributaries of Montana written by and published by . This book was released on 1998 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt: