Download or read book A Quantitative Geomorphic Approach to Predicting Productivity of Pink and Chum Salmon Streams in Southeast Alaska written by Douglas N. Swanston and published by . This book was released on 1977 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Quantitative Geomorphic Approach to Predicting Productivity of Pink and Chum Salmon Streams in Southeast Alaska Classic Reprint written by Douglas N. Swanston and published by Forgotten Books. This book was released on 2018-09-07 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from A Quantitative Geomorphic Approach to Predicting Productivity of Pink and Chum Salmon Streams in Southeast Alaska Thompson and Hunt (1930) stressed the importance of the drainage basin as a whole, not just the stream, in their investigations of the basic nature of stream productivity. Slack (1955) reinforced this concept in his studies of stream productivity factors, demonstrating that the biolog ical productivity of a stream is directly related to the physical environment of the watershed, which controls drainage pattern, flow rates, gravel size and shape, channel gradient, and general stability characteristics. Statistical analysis of quantitative geomorphic parameters of individual watersheds can help identify these factors. Quantitative geomorphic techniques developed by Horton (1932, 1945) and Strahler (1952, 1953, 1954) provide a convenient method for obtaining numerical data on gross basin character istics, given limited funding and difficulty of access and sampling of test streams. Measurement of physical parame ters based on basin and channel geometry, obtainable from aerial photographs and topographic maps, provides correlation units such as drainage size and shape, stream density, and pattern, number, and length of tribu taries. These in turn provide an estimate of stage of water shed development, probable basin discharge, extent of bedrock control of drainage, impact of unstable slopes, and extent of channel suitable for spawning. Such techniques have been used successfully to analyze relationships between erosion, climate, surface properties, and geomorphology (melton 1957, Maxwell 1960, Dissmeyer In 1973, Ziemer used quantitative geomorphic techniques to relate drainage basin and channel configuration to changes in production of pink salmon on Montague Island Prince William Sound, Alaska, after large vertical tectonic adjustments resulting from the Good Friday Earthquake of 1964. Using five drainage system factors, he showed a correlation between drainage system geometry and freshwater production factors for pink salmon, with escapement as his indicator of production. He assumed that (1) the number of spawners using a stream is a sound measure of fish production in that stream, (2) escapement counts were consistently made from year to year and stream to stream, and (3) the impact of the fishery was consistent between stocks and years. He realized the problems involved by making these assumptions, but he had no other tools available. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
Download or read book A Quantitative Geomorphic Approach to Predicting Productivity of Pink and Chum Salmon Streams in Southeast Alaska written by Douglas N. Swanston and published by . This book was released on 1977 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Mortality of Pink and Chum Salmon Eggs and Larvae in Southeast Alaska Streams written by William J. McNeil and published by . This book was released on 1962 with total page 540 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Southeast Alaska Pink Salmon Forecasting Models written by Sara E. Miller and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Pink salmon Oncorhynchus gorbuscha runs are notoriously difficult to forecast due to the species’ propensity to respond dramatically to changes in the marine environment, cycles of abundance that fluctuate between odd and even years, and the fact that only one age class exists in the fishery each year. In an attempt to improve upon the standard forecast model, which incorporates juvenile pink salmon abundance (catch per unit effort [CPUE]) and temperature data (Icy Strait Temperature Index [ISTI]) from the National Oceanic and Atmospheric Administration (NOAA) Southeast Alaska Coastal Monitoring project, models with a different temperature index (satellite sea surface temperature [SST] data) along with a model-averaging approach were explored. To determine if one of these new approaches should be applied to the 2023 Southeast Alaska preseason pink salmon harvest forecast, the performance of the inverse-variance weighted model-averaged forecast, the equally weighted model-averaged forecast, and the individual regression models with satellite SST data or ISTI were compared for the last 5 and 10 years using only the data available at the time of the forecast. Based on the 5- and 10-year one-step-ahead mean absolute percent error (MAPE), the models that included juvenile pink salmon abundance (CPUE) and a spring and summer temperature index based on northern Southeast Alaska satellite SST data performed better than either of the model-averaged forecasts and better than the standard model with the biophysical variables CPUE and ISTI.
Download or read book Distribution of Spawning Pink Salmon in Sashin Creek Southeastern Alaska and Survival of Their Progeny Classic Reprint written by William J. Mcneil and published by Forgotten Books. This book was released on 2017-06-15 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from Distribution of Spawning Pink Salmon in Sashin Creek, Southeastern Alaska, and Survival of Their Progeny Although the upper area was highly productive of pink salmon fry, it has had intensive spawning only in years when the density of spawners was high. When the density was low, spawners tended to concentrate in the lower area. The validity of the supposition that only highly productive spawning beds are used when escapements are small is questioned. The observations at Sashin Creek indicate that relatively large escapements help ensure complete use of productive spawning beds. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
Download or read book Central Alaska Salmon Investigations written by James B. Kirkwood and published by . This book was released on 1958 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Alaska Salmon Studies written by S. Philip Shapley and published by . This book was released on 1964 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Acquisition and Utilization of Aquatic Habitat Inventory Information written by Neil B. Armantrout and published by . This book was released on 1982 with total page 428 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Proceedings of the Second Glacier Bay Science Symposium written by Alexander M. Milner and published by . This book was released on 1990 with total page 186 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Dynamics of Marine Ecosystems written by K. H. Mann and published by John Wiley & Sons. This book was released on 2013-04-16 with total page 512 pages. Available in PDF, EPUB and Kindle. Book excerpt: The new edition of this widely respected text providescomprehensive and up-to-date coverage of the effects ofbiological–physical interactions in the oceans from themicroscopic to the global scale. considers the influence of physical forcing on biologicalprocesses in a wide range of marine habitats including coastalestuaries, shelf-break fronts, major ocean gyres, coral reefs,coastal upwelling areas, and the equatorial upwelling system investigates recent significant developments in this rapidlyadvancing field includes new research suggesting that long-term variability inthe global atmospheric circulation affects the circulation of oceanbasins, which in turn brings about major changes in fish stocks.This discovery opens up the exciting possibility of being able topredict major changes in global fish stocks written in an accessible, lucid style, this textbook isessential reading for upper-level undergraduates and graduatestudents studying marine ecology and biological oceanography
Download or read book Forest Hydrology written by Devendra Amatya and published by CABI. This book was released on 2016-09-14 with total page 309 pages. Available in PDF, EPUB and Kindle. Book excerpt: Forests cover approximately 26% of the world's land surface area and represent a distinct biotic community. They interact with water and soil in a variety of ways, providing canopy surfaces which trap precipitation and allow evaporation back into the atmosphere, thus regulating how much water reaches the forest floor as through fall, as well as pull water from the soil for transpiration. The discipline "forest hydrology" has been developed throughout the 20th century. During that time human intervention in natural landscapes has increased, and land use and management practices have intensified. The book will be useful for graduate students, professionals, land managers, practitioners, and researchers with a good understanding of the basic principles of hydrology and hydrologic processes.
Download or read book Fundamentals of Urban Runoff Management written by Earl Shaver and published by . This book was released on 2007 with total page 327 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Cumulative Environmental Effects of Oil and Gas Activities on Alaska s North Slope written by National Research Council and published by National Academies Press. This book was released on 2003-09-04 with total page 305 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book identifies accumulated environmental, social and economic effects of oil and gas leasing, exploration, and production on Alaska's North Slope. Economic benefits to the region have been accompanied by effects of the roads, infrastructure and activies of oil and gas production on the terrain, plants, animals and peoples of the North Slope. While attempts by the oil industry and regulatory agencies have reduced many of the environmental effects, they have not been eliminated. The book makes recommendations for further environmental research related to environmental effects.
Download or read book Evolution of Marine Coastal Ecosystems under the Pressure of Global Changes written by Hubert-Jean Ceccaldi and published by Springer Nature. This book was released on 2020-06-15 with total page 521 pages. Available in PDF, EPUB and Kindle. Book excerpt: Coastal and estuarine environments at the interface of terrestrial and marine areas are among the most productive in the world. However, since the beginning of the industrial era, these ecosystems have been subjected to strong anthropogenic pressures intensified from the second half of the 20th century, when there was a marked acceleration in the warming (climate change) of the continents, particularly at high latitudes. Coastal ecosystems are highly vulnerable to alteration of their physical, chemical and biological characteristics (marine intrusion, acidification of marine environments, changes in ecosystems, evolution and artificialization of the coastline, etc.).In contact with heavily populated areas, these environments are often the receptacle of a lot of chemical and biological pollution sources that significantly diminish their resilience. In this context of accelerated evolution and degradation of these areas important for food security of many populations around the world, it is necessary to better identify the factors of pressure and understand, at different scales of observation, their effects and impacts on the biodiversity and on the socio-eco-systems, in order to determine the degree of vulnerability of these coastal ecosystems and the risks they face. A transdisciplinary and integrated approach is required to prevent risks. Within this framework, operational coastal oceanography occupies an important place but also the implementation of a true socio-eco-system approach in order to set up an environmentally friendly development.
Download or read book Baltic Coastal Ecosystems written by Gerald Schernewski and published by Springer Science & Business Media. This book was released on 2013-03-14 with total page 416 pages. Available in PDF, EPUB and Kindle. Book excerpt: Between November 20 and 23, 2000, the workshop "Baltic Coastal Ecosystems - Structure, Function and Coastal Zone Management" took place in Rostock, Ger many. The workshop was organised by the Institute of Aquatic Ecology of the University of Rostock and the Baltic Sea Research Institute Warnemiinde on be half of the Wissenschafts-Verbund Umwelt (WVU) at the University of Rostock. It was the third trans-disciplinary event that tried to link ecological and socio economical aspects with respect to the Baltic Sea. The first symposium was held in 1992, entitled "The Future of the Baltic Sea - Ecology, Economics, Administra tion and Teaching", and the second event took place in 1996, entitled "Sustainable Development in Coastal Regions - a Comparison Between North Atlantic Coast and Baltic Sea". The workshop "Baltic Coastal Ecosystems - Structure, Function and Coastal Zone Management" tried to provide an interdisciplinary forum for discussions, the exchange of ideas and the presentation of scientific results with respect to the Bal tic coast.
Download or read book Management of wildlife and fish habitats in forests of western Oregon and Washington written by and published by . This book was released on 1985 with total page 322 pages. Available in PDF, EPUB and Kindle. Book excerpt:
