Download or read book Competition Between Non native Brook Trout and Coho Salmon in the Elwha River WA During Dam Removal written by Emily Thornton and published by . This book was released on 2015 with total page 71 pages. Available in PDF, EPUB and Kindle. Book excerpt: The removal of two dams on the Elwha River, WA is the largest dam removal project in US history. A major goal of this project is to restore historically abundant populations of Pacific salmon to the river, so it is important to know if competition between resident and anadromous species could inhibit salmon recolonization. We investigated competitive interactions in laboratory streams to determine how species, size, and group size affected competitive dominance and determined the level of habitat and prey resource use overlap to indicate the potential for competition in reaches of the Elwha River. Coho salmon were competitively dominant over brook trout regardless of size difference or group size, and will likely outcompete brook trout in the wild if resources become limited. Prey resource use overlap indicated potential for competition in sympatric areas, but density and distribution patterns did not suggest that competition was occurring at the reach scale.
Download or read book Final Environmental Impact Statement written by United States. National Park Service and published by . This book was released on 1995 with total page 718 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Draft Environmental Impact Statement written by United States. National Park Service and published by . This book was released on 1994 with total page 158 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Olympic National Park N P Elwha River Ecosystem Restoration Programmatic EIS Clallam County written by and published by . This book was released on 1995 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Dam Nation written by Stephen Grace and published by Rowman & Littlefield. This book was released on 2013-05-07 with total page 363 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the scramble to claim water rights in the West during the fevered days of early emigration and expansion, running out of water was rarely a concern, and the dam building fever that transformed the West in the 19th and 20th centuries created a map of the region that may be unsustainable. Throughout the arid American West, metropolitan areas such as Los Angeles, Phoenix, Las Vegas and Denver need water. These cities are growing, but water supplies are dwindling. Scientists agree that the West is heating up and drying out, leading to future water shortages that will pose a challenge to existing laws. Dam Nation looks first to the past, to the stories of the California gold rush and the earliest attempts by men to shape the landscape and tame it, takes us to the “Great American Desert” and the settlement of the west under the theory that "rain follows the plow," and then takes on the ongoing legal and moral battles in the West. Author Stephen Grace, is a novelist, a storyteller, and the author of several non-fiction books on Colorado. He weaves the facts into a compelling narrative that informs, entertains, and tells an important story.
Download or read book Northwest Science written by and published by . This book was released on 2008 with total page 610 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Coastal Habitats of the Elwha River Washington written by Jeffrey J. Duda and published by . This book was released on 2011 with total page 276 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Competition Among Juveniles of Coho Salmon Brook and Brown Trout for Resources in Streams written by Kurt Daniel Fausch and published by . This book was released on 1981 with total page 230 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Elwha River Ecosystem and Fisheries Restoration Act written by United States. Congress. Senate. Committee on Energy and Natural Resources and published by . This book was released on 1992 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Impacts of the Elwha River Dam Removals on Chinook Salmon Oncorhynchus Tshawytscha Spawning Habitat written by Elizabeth Matteri and published by . This book was released on 2021 with total page 25 pages. Available in PDF, EPUB and Kindle. Book excerpt: Streambed particle size is a key factor influencing Chinook salmon (Oncorhynchus tshawytscha) spawning site suitability. Both the construction and removal of dams alter the sediment in rivers, resulting in changes to suitable habitat for salmon. When in place, dams impede the movement of sediment, resulting in an accumulation of sediment above the dam and a degradation of the riverbed below the dam. The release of this accumulated sediment after dam removal can restore a more natural distribution of sediment size classes below the dam, potentially improving salmon spawning habitat. Dam removal for the purpose of river restoration and improving conditions for salmon has increased in recent decades. The purpose of this study is to assess the effects of the sediment released from two large dam removals on the Elwha River in Washington state on streambed particle size, and the resultant amount of suitable spawnable habitat for Chinook salmon. Pebble counts were conducted in 45 riffles in 2009, before dam removal, and in 21 riffles in 2015, after dam removal, in the mainstem of the Lower and Middle sections of the Elwha River. The fraction of movable particles by a spawning Chinook salmon in the riffle crests increased by 43% after dam removal, resulting in more suitable spawning habitat. After dam removal, there was greater variation in sediment size within riffle crests, whereas there were predominantly larger particles before dam removal. The positive changes in sediment measured in this project support the concept that dam removal is a meaningful strategy for salmon restoration.
Download or read book Status of Columbia River Salmon and Steelhead Trout written by Frederick Charles Cleaver and published by . This book was released on 1972 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effects of Coho Salmon Oncorhynchus Kisutch Recolonization on Resident Cutthroat Trout O Clarki Clarki written by Erin Jones and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In 1901, the Landsburg Diversion Dam was established in the middle of the Cedar River in Washington, effectively cutting off access to habitat for migrating salmon populations. For a hundred years, no salmon dwelled in stream reaches above the dam, but the resident cutthroat trout populations remained. This was the case until 2003, when a fish ladder was built into the Landsburg Dam, reopening passage to spawning habitat for salmon and reintroducing the species to existing trout populations. In this project, coho salmon (Oncorhynchus kisutch) and cutthroat trout (O. clarki clarki) were used to study the competitive effects of recolonization in two neighboring streams, Rock Creek (salmon present) and Williams Creek (salmon absent), in the Cedar River watershed. Though it has been found that opening up passageways to previous spawning sites leads to successful recolonization of the target species, few studies have determined if reintroducing a species to an ecosystem that has survived without it for so long has negative effect on resident species. Previous studies determined that salmon exert dominance over cutthroat trout in certain conditions. Conversely, some recent studies have found no negative impact on cutthroat trout from coho salmon recolonization. Species population densities were computed and tested for correlation to observe temporal and spatial population trends and determine if coho negatively influence the population dynamics of cutthroat trout. Our results indicate that both species populations in Rock Creek are growing since the fish ladder was built. However, coho populations are growing more rapidly than the cutthroat trout in the shared stream. However, the trout population in Williams Creek is growing at a faster rate than that of the trout in Rock Creek. Nonparametric testing indicated that there is a significant and positive relationship between coho and cutthroat pool densities, thus refuting our hypothesis. Our results suggest that there is not a significant competitive effect as a result of the coho recolonization. Stream conditions could be improving for both species and aiding in population growth. Future testing should compare the mixed stream (salmon present) with more isolated streams (salmon absent), like Williams, to confirm if the discrepancy between cutthroat trout population growths, in habitats without salmon versus habitats with salmon, is a result of the coho presence or if it is due to improved habitat conditions in general.
Download or read book Brook Trout Removal as a Conservation Tool to Restore Eagle Lake Rainbow Trout written by Gerard Carmona Catot and published by . This book was released on 2009 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Competition Between Stream dwelling Cutthroat Trout Oncorhynchus Clarki Clarki and Coho Salmon O Kisutch written by John Louis Sabo and published by . This book was released on 1995 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Interactions Between Resident Trout and Anadromous Salmonids draft written by United States. Forest Service and published by . This book was released on 1995 with total page 29 pages. Available in PDF, EPUB and Kindle. Book excerpt: While a number of unique characteristics of the White Salmon River raise research questions about the effects of reintroduction of anadromous fish, the only information available at the time this report was compiled leads to the conclusion that the reintroduction of steelhead above Condit Dam would reduce the resident rainbow trout population somewhere between 70 and 90 percent. This is primarily due to intra-specific competition and is based on the work done by Bjornn on Big Springs Creek in Idaho. His study is considered to be the most quantitative study that has been done on the subject. This information also leads to the conclusion that the reintroduction of chinook salmon above Condit Dam will reduce the resident rainbow trout population approximately 10 percent. This reduction is due to a small overlap in the habitat used by resident rainbow trout and chinook salmon. The information relevant to coho salmon is not as definitive as that for the other species making it difficult to quantify the effects of introducing coho salon on resident rainbow trout. The impact of coho salmon and resident rainbow trout competition during the night needs to be addressed prior to making any determination on the diminishment of the resident rainbow trout population. The potential disease threat to the resident rainbow trout population above Condit Dam needs to be further evaluated prior to the introduction of any vectors which may transmit Ceratomyxosis or whirling disease. It is not possible to know whether the resident rainbow population above Condit Dam is susceptible to Ceratomyxosis unless they are checked by exposing a sample of the fish to the disease during the infectious stage. An analysis of all other diseases which have the potential for significantly diminishing the resident rainbow population needs to be completed prior introduction of any anadromous salmonids.
Download or read book Effects of Nonnative Brook Trout on Colorado River Cutthroat Trout Populations written by Douglas P. Peterson and published by . This book was released on 2000 with total page 67 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Competition Between Coho Salmon and Rainbow Trout in the Laboratory written by Percy W. Laarman and published by . This book was released on 1967 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt:
