Download or read book Interpreting Impacts of Introduced Trout Populations in Mountain Lakes in the Era of Ecological Restoration written by Queenie Z. Gray and published by . This book was released on 2013 with total page 78 pages. Available in PDF, EPUB and Kindle. Book excerpt: Stocking exotic trout species in high mountain lakes was a common practice in Rocky Mountain Lakes in the 20th century. Currently, restoration action to remove trout populations favours the conservation of native food webs. Meanwhile, little is known about the self-sustaining trout populations, particularly in our study area. We assessed impacts of stocking trout on naturally fishless foodwebs of mountain lakes. Results were applied to management goals in Waterton Lakes National Park. A comparison of mean abundances of zooplankton in fish and fishless lakes revealed differences in less than half the taxa encountered. Principle component analysis did not show an association between zooplankton community structure and fish presence. Paleolimnological analyses suggested an increase in relative abundance of large-bodied cladocerans, but statistical power was low. The results show the importance of identifying explicit restoration objectives because impacts may not be compelling. If restoration by trout eradication is pursued, demographic characteristics can aid in selecting which populations are more easily depleted by gillnetting. We used generalized linear models to examine four population characteristics associated with population decline: 1) catch per unit effort (CPUE), 2) proportion of females, 3) proportion of mature individuals and 4) length of mature individuals. There were significant differences between populations in CPUE and length at maturity, but not on the proportion of females or mature individuals. We thus incorporated the former characteristics into a basic assessment system and ranked the 11 salmonid populations by their susceptibility to eradication. We presented a simple yet meaningful step in facilitating management actions commonly constrained by a lack of biological knowledge.
Download or read book Interpreting Impacts of Exotic Trout Populations on Mountain Lakes in the Era of Ecological Restoration written by Queenie Z. Gray and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Ecological Impact of Introduced Trout on Native Aquatic Communities in Mountain Lakes written by William J. Liss and published by . This book was released on 2002 with total page 115 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Ecological Impact of Introduced Trout on Native Aquatic Communities in Mountain Lakes written by and published by . This book was released on 2002 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Ecological Implications of Trout Introductions to Lakes of the Selway Bitterroot Wilderness Idaho written by Peter F. Bahls and published by . This book was released on 1990 with total page 170 pages. Available in PDF, EPUB and Kindle. Book excerpt: The widespread introduction of trout to naturally fishless mountain lakes in the western United States has been accompanied by little research. The ecological role of trout populations occurring in 91 lakes of the central Selway Bitterroot Wilderness, Idaho, was examined with respect to 1) the sampling variability of biological and chemical lake characteristics measured, 2) possible effects of trout on biotic communities of crustacean zooplankton, macro-invertebrates, amphibians and reptiles, and 3) the relation of fish population characteristics (condition and maximum body length) to stocking rate, angling pressure, natural recruitment and lake habitat characteristics. Based on 22 lakes surveyed two or three times over a three year period, sampling variability was relatively low for individual species, biotic communities and length and weight of the largest fish in the population. Water conductivity measured at the lake surface from shore was the most reliable index of water quality, exhibiting low seasonal and duplicate sampling variability and a high correlation with alkalinity samples. Based on Detrended Correspondence Analysis (DCA), an ordination method used to organize the 91 lakes by the presence or absence of taxa, the composition of indigenous biotic communities was strongly related to the presence or absence of fish. The Multi-Response Permutation Procedure indicated that the difference in communities was statistically significant. Fewer taxa were sampled in lakes with fish and the taxa expected to be most vulnerable to predation due to their large size and frequent occurrence in open water were rarely found in lakes containing fish. DCA ordinations indicated that characteristics of the fish population (fish species, condition and maximum body length) were also related to the composition of the biotic community. This was probably due to the bottom up:top down trophic level interactions of predator and prey; fish affecting the structure of biotic communities by predation and prey affecting growth and condition of fish by their abundance and availability as determined by both physical habitat characteristics and impacts of predation by fish. Average condition and maximum body length of fish populations were related to stocking rate, natural recruitment, angling pressure and lake habitat variables by stepwise multiple regression. Average condition and maximum body length increased with decreasing level of natural recruitment for all fish population classes, except brook trout (all with high natural recruitment) and populations with no natural recruitment. Average fish condition increased with increasing angling pressure (measured by campsite impact and access distance ratings). Maximum body length of fish increased in relation to habitat variables, particularly presence of the large (2-3 mm) calanoid copepod, Diaptomus sp. Stocking rate was not related to average condition or maximum body length for any fish population class tested except one, where it may represent a spurious correlation. The findings of this study suggest the need to reassess high lake research and management policies that have promoted 1) widespread stocking of un-surveyed lakes on a regular basis and 2) considered stocking rate adjustments as an effective means of manipulating fish populations. Management direction can now be based on a recognition of the potential usefulness of one-time sampling of biological and chemical lake characteristics, the potential for significant impacts of fish on indigenous biotic communities, and the importance of natural recruitment, angling pressure and habitat variables in determining characteristics of the fish population. Recommendations include the identification and maintenance without further stocking of fishless lakes and lakes containing self sustaining trout populations (wild trout lakes).
Download or read book Effects of Introduced Trout on Ecosystem Subsidy and Amphibian Decline written by Karen Lesley Pope and published by . This book was released on 2008 with total page 228 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Climate Change Impacts on Freshwater Ecosystems written by Martin Kernan and published by John Wiley & Sons. This book was released on 2011-02-14 with total page 470 pages. Available in PDF, EPUB and Kindle. Book excerpt: This text examines the impact of climate change on freshwater ecosystems, past, present and future. It especially considers the interactions between climate change and other drivers of change including hydromorphological modification, nutrient loading, acid deposition and contamination by toxic substances using evidence from palaeolimnology, time-series analysis, space-for-time substitution, laboratory and field experiments and process modelling. The book evaluates these processes in relation to extreme events, seasonal changes in ecosystems, trends over decadal-scale time periods, mitigation strategies and ecosystem recovery. The book is also concerned with how aspects of hydrophysical, hydrochemical and ecological change can be used as early indicators of climate change in aquatic ecosystems and it addresses the implications of future climate change for freshwater ecosystem management at the catchment scale. This is an ideal book for the scientific research community, but is also accessible to Masters and senior undergraduate students.
Download or read book North Cascades National Park N P Mountain Lakes Fishery Management Plan written by and published by . This book was released on 2008 with total page 590 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book South Fork Flathead Watershed Westslope Cutthroat Trout Conservation Program written by and published by . This book was released on 2005 with total page 418 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Trout and Salmon of North America written by Robert Behnke and published by Simon and Schuster. This book was released on 2010-07-06 with total page 376 pages. Available in PDF, EPUB and Kindle. Book excerpt: This beautiful and definitive guide brings together the world's lead leading expert on North American trout and salmon, Robert Behnke, and the foremost illustrator in the field, Joseph Tomelleri. North America is graced with the greatest diversity of trout and salmon on earth. From tiny brook trout in mountain streams of the Northeast, to cutthroat trout in the rivers of the Rockies, to Chinook salmon of the Pacific, the continent is home to more than 70 types of trout and salmon. How this came to be, how they are related, and what makes them unique -- and so breathtaking -- is the story of Trout and Salmon of North America. The more than 100 illustrations of trout and salmon by Joseph Tomelleri showcased here exhibit a genius for detail, coloration, and proportion. Each portrait is made from field notes, streamside observations, photographs, and specimens collected by the artist. The result is a set of the most accurate and stunning illustrations of fish ever created. Robert Behnke has distilled 50 years of his research and writing about trout and salmon in completing this book. No one understands better than Behnke the diversity and conservation issues concerning these fishes or communicates so lucidly the biological wonders and complexities of their particular beauty. Also included are more than 40 richly detailed maps that clearly show the ranges of populations of trout and salmon throughout North America. An irresistible delight for anyone who appreciates natural history, Trout and Salmon of North America is a master guide to the natural elegance of our native fishes.
Download or read book Canadian Journal of Fisheries and Aquatic Sciences written by and published by . This book was released on 1994 with total page 818 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Yellowstone Fishes written by John D. Varley and published by Stackpole Books. This book was released on 1998 with total page 170 pages. Available in PDF, EPUB and Kindle. Book excerpt: This richly illustrated and thoroughly researched reference covers all the species of fish and every aspect of their existence in one of the most famous sport fisheries in the world. This edition includes new material on the impact of forest fires and the introduction of non-native species; an expanded chapter on angling; and an assessment of recent management policies. Full color plates and historic b&w photos.
Download or read book Climate Change in Wildlands written by Andrew J Hansen and published by Island Press. This book was released on 2016-06-07 with total page 408 pages. Available in PDF, EPUB and Kindle. Book excerpt: Scientists have been warning for years that human activity is heating up the planet and climate change is under way. We are only just beginning to acknowledge the serious effects this will have on all life on Earth. The federal government is crafting broad-scale strategies to protect wildland ecosystems from the worst effects of climate change. One of the greatest challenges is to get the latest science into the hands of resource managers entrusted with vulnerable wildland ecosystems. This book examines climate and land-use changes in montane environments, assesses the vulnerability of species and ecosystems to these changes, and provides resource managers with collaborative management approaches to mitigate expected impacts. Climate Change in Wildlands proposes a new kind of collaboration between scientists and managers--a science-derived framework and common-sense approaches for keeping parks and protected areas healthy on a rapidly changing planet.
Download or read book Ecology Abstracts written by and published by . This book was released on 1997 with total page 730 pages. Available in PDF, EPUB and Kindle. Book excerpt: Coverage: 1982- current; updated: monthly. This database covers current ecology research across a wide range of disciplines, reflecting recent advances in light of growing evidence regarding global environmental change and destruction. Major ares of subject coverage include: Algae/lichens, Animals, Annelids, Aquatic ecosystems, Arachnids, Arid zones, Birds, Brackish water, Bryophytes/pteridophytes, Coastal ecosystems, Conifers, Conservation, Control, Crustaceans, Ecosyst em studies, Fungi, Grasses, Grasslands, High altitude environments, Human ecology, Insects, Legumes, Mammals, Management, Microorganisms, Molluscs, Nematodes, Paleo-ecology, Plants, Pollution studies, Reptiles, River basins, Soil, TAiga/tundra, Terrestrial ecosystems, Vertebrates, Wetlands, Woodlands.
Download or read book High Mountain Conservation in a Changing World written by Jordi Catalan and published by Springer. This book was released on 2017-08-03 with total page 413 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides case studies and general views of the main processes involved in the ecosystem shifts occurring in the high mountains and analyses the implications for nature conservation. Case studies from the Pyrenees are preponderant, with a comprehensive set of mountain ranges surrounded by highly populated lowland areas also being considered. The introductory and closing chapters will summarise the main challenges that nature conservation may face in mountain areas under the environmental shifting conditions. Further chapters put forward approaches from environmental geography, functional ecology, biogeography, and paleoenvironmental reconstructions. Organisms from microbes to large carnivores, and ecosystems from lakes to forest will be considered. This interdisciplinary book will appeal to researchers in mountain ecosystems, students and nature professionals. This book is open access under a CC BY license.
Download or read book Restoration of Aquatic Ecosystems written by National Research Council and published by National Academies Press. This book was released on 1992-01-01 with total page 580 pages. Available in PDF, EPUB and Kindle. Book excerpt: Aldo Leopold, father of the "land ethic," once said, "The time has come for science to busy itself with the earth itself. The first step is to reconstruct a sample of what we had to begin with." The concept he expressedâ€"restorationâ€"is defined in this comprehensive new volume that examines the prospects for repairing the damage society has done to the nation's aquatic resources: lakes, rivers and streams, and wetlands. Restoration of Aquatic Ecosystems outlines a national strategy for aquatic restoration, with practical recommendations, and features case studies of aquatic restoration activities around the country. The committee examines: Key concepts and techniques used in restoration. Common factors in successful restoration efforts. Threats to the health of the nation's aquatic ecosystems. Approaches to evaluation before, during, and after a restoration project. The emerging specialties of restoration and landscape ecology.
Download or read book Invasive Species in Forests and Rangelands of the United States written by Therese M. Poland and published by Springer Nature. This book was released on 2021-02-01 with total page 455 pages. Available in PDF, EPUB and Kindle. Book excerpt: This open access book describes the serious threat of invasive species to native ecosystems. Invasive species have caused and will continue to cause enormous ecological and economic damage with ever increasing world trade. This multi-disciplinary book, written by over 100 national experts, presents the latest research on a wide range of natural science and social science fields that explore the ecology, impacts, and practical tools for management of invasive species. It covers species of all taxonomic groups from insects and pathogens, to plants, vertebrates, and aquatic organisms that impact a diversity of habitats in forests, rangelands and grasslands of the United States. It is well-illustrated, provides summaries of the most important invasive species and issues impacting all regions of the country, and includes a comprehensive primary reference list for each topic. This scientific synthesis provides the cultural, economic, scientific and social context for addressing environmental challenges posed by invasive species and will be a valuable resource for scholars, policy makers, natural resource managers and practitioners.
