Download or read book Potential Impacts of Zebra Mussel Invasion on Gamefish Health and Prey Availability in Prairie Lakes written by Caroline Barbara Ofosu and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Invasive species are a threat to global aquatic ecosystems. Nonetheless, their impacts can be heterogeneous across systems. Recent reports suggest Saskatchewan (SK) prairie lakes are highly prone to zebra and quagga mussels (ZQM) given their proximity to invasive corridors of Manitoba and three US states (Montana, North Dakota, and Minnesota) where they have been reported. As the effect of ZQM on native species is variable and context-dependent across locations and time, an understanding of prevailing biological, physical and chemical conditions supporting various cohorts of fish communities is necessary for prioritizing mitigation efforts to address the potential effects of these dreissenids in uninvaded systems. To gain these important insights, I investigated diet composition and body conditions of three ecologically and recreationally important gamefishes; walleye (Sander vitreus), northern pike (Esox lucius), and yellow perch (Perca flavescens) sampled from 18 SK prairie lakes. In addition, I assessed the impact of fish size and environmental variables on gamefish body conditions. Twenty-three prey taxa were found in the diets of these fishes. While both invertebrates (amphipods) and fish formed significant constituents of walleye diets, pike concentrated more on fish prey, whereas perch relied more on invertebrates (chironomids and amphipods). Zooplankton was only a minor contributor to the diets of all three gamefish species. Body conditions of walleye and pike decreased with size, but yellow perch populations were in consistently good condition across all size groups. These results suggest preferred fish prey of larger piscivores (i.e., pike and walleye) may be present in insufficient quantity. Lake productivity and alkalinity influenced body conditions of large-sized walleye and yellow perch. The scarcity of pelagic zooplankton prey in the diets of small-sized gamefishes implies these populations may be less threatened by future ZQM invasion than previously assumed. Next, I contrasted stomach content data and Carbon (C), Nitrogen (N), with Sulfur (S) stable isotope analyses to better quantify the relative importance of various foraging habitats to the three gamefish species. Bayesian Mixing models predicted that in about 70% of our study lakes > 55% of gamefish diets were sourced from the littoral region, whereas in ~30% of surveyed lakes, > 55% of gamefishes diets was sourced from the pelagic habitat. General evidence of similar reliance on sediment S sources in lakes where two species co-occurred (walleye and pike or walleye and perch) was observed. Overall, the three predominant gamefishes exhibited comparable dependence on the three feeding habitats (littoral, pelagic, sediment) across SK prairie lakes. Findings of stomach content analysis (SCA) and stable isotope analysis (SIA) were assessed to determine how the two techniques corroborate, contradict or complement each other. Results indicated a lack of correspondence between the two methods utilized in examining walleye diets, suggesting the need to use both techniques as complements for more robust results. Finally, because future invasion by ZQM is expected to significantly impact energy sources of gamefishes, I examined the current environmental controls of reliance on pelagic, littoral, and sediment-based diets. Walleye reliance on pelagic energy sources increased with the maximum depth of lakes and decreased with total dissolved solids (TDS) concentrations, implying the contribution of pelagic diets increase for fish populations in deeper and less saline lakes. However, sediment-based diets were not influenced by any of the selected environmental parameters. Integrating SCA and SIA overall helped to advance our understanding of feeding habits of gamefish populations in SK prairie lakes and demonstrates the value of combining these analyses for a comprehensive understanding of feeding interactions within aquatic ecosystems.

Download or read book Arctic National Wildlife Refuge written by Mary Lynne Corn and published by Nova Publishers. This book was released on 2003 with total page 162 pages. Available in PDF, EPUB and Kindle. Book excerpt: The rich biological resources and wilderness values of north-eastern Alaska have been widely known for about 50 years, and the rich energy resource potential for much of that time. The future of these resources has been debated in Congress for over 40 years. The issue for now is whether to open a portion of what is now the Arctic National Wildlife Refuge (ANWR) to allow the development of potentially the richest on-shore source of oil remaining in the United States, and if so under what restrictions. The coastal northern plain of the Refuge is the focus of the debate. This remote and largely untouched area is an example of an arctic ecosystem that, by virtue of being essentially intact, is increasingly rare. It has been called 'America's Serengeti', for vast herds of caribou, for the many nesting and feeding migratory birds, and for its predators such as grizzly bears, polar bears, wolves and golden eagles. The area also has immensely promising oil prospects, which some feel could be as productive as Prudhoe Bay. It is heralded as a place which could help reduce national dependence on foreign oil and keep the Alaskan oil pipeline in use for decades. Advocates for development foresee benefits to the oil industry, the people of Alaska, and the national economy. This book provides basic material for analysing possibilities and implications of the major issues that have been the focus of the debate over its fate.

Download or read book Biology and Control of Aquatic Plants written by Lyn A. Gettys and published by . This book was released on 2009 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt: Biology and Control of Aquatic Plants: A Best Management Practices Handbook is the fourth edition of a handbook produced by the not for profit Aquatic Ecosystem Restoration Foundation (AERF). The mission of the AERF is to support research and development which provides strategies and techniques for the environmentally and scientifically sound management, conservation and restoration of aquatic ecosystems. One way the Foundation accomplishes this mission is by producing this handbook to provide information to the public regarding the benefits of aquatic ecosystem conservation and aquatic plant management. The first, second and third editions of this handbook became some of the most widely consulted references in the aquatic plant management community. This fourth edition has been specifically designed with water resource managers, water management associations, homeowners and customers and operators of aquatic plant management companies and districts in mind. Our goal in preparing this handbook is to provide basic, scientifically sound information to assist decision-makers with their water management questions.

Download or read book Ecology written by Charles J. Krebs and published by Benjamin-Cummings Publishing Company. This book was released on 2001 with total page 695 pages. Available in PDF, EPUB and Kindle. Book excerpt: This best-selling majors ecology book continues to present ecology as a series of problems for readers to critically analyze. No other text presents analytical, quantitative, and statistical ecological information in an equally accessible style. Reflecting the way ecologists actually practice, the book emphasizes the role of experiments in testing ecological ideas and discusses many contemporary and controversial problems related to distribution and abundance. Throughout the book, Krebs thoroughly explains the application of mathematical concepts in ecology while reinforcing these concepts with research references, examples, and interesting end-of-chapter review questions. Thoroughly updated with new examples and references, the book now features a new full-color design and is accompanied by an art CD-ROM for instructors. The field package also includes The Ecology Action Guide, a guide that encourages readers to be environmentally responsible citizens, and a subscription to The Ecology Place (www.ecologyplace.com), a web site and CD-ROM that enables users to become virtual field ecologists by performing experiments such as estimating the number of mice on an imaginary island or restoring prairie land in Iowa. For college instructors and students.

Download or read book Cyanobacterial Harmful Algal Blooms State of the Science and Research Needs written by H. Kenneth Hudnell and published by Springer Science & Business Media. This book was released on 2008-03-13 with total page 955 pages. Available in PDF, EPUB and Kindle. Book excerpt: With the ever-increasing incidence of harmful cyanobacterial algal blooms, this monograph has added urgency and will be essential reading for all sorts of researchers, from neuroscientists to cancer research specialists. The volume contains the proceedings of the 2005 International Symposium on Cyanobacterial Harmful Algal Blooms, and has been edited by H. Kenneth Hudnell, of the US Environmental Protection Agency. It contains much of the most recent research into the subject.

Download or read book Managing Lakes and Reservoirs written by North American Lake Management Society and published by University of Wisconsin Press. This book was released on 2001 with total page 400 pages. Available in PDF, EPUB and Kindle. Book excerpt: Written for the lake user, this third edition testifies to the success and the leadership of EPA's Clean Lakes Program.

Download or read book Harmful Non indigenous Species in the United States written by and published by . This book was released on 1993 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Biotic Homogenization written by Julie L. Lockwood and published by Springer Science & Business Media. This book was released on 2011-06-28 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt: Biological homogenization is the dominant process shaping the future global biosphere. As global transportation becomes faster and more frequent, it is inevitable that biotic intermixing will increase. Unique local biotas will become extinct only to be replaced by already widespread biotas that can tolerate human activities. This process is affecting all aspects of our world: language, economies, and ecosystems alike. The ultimate outcome is the loss of uniqueness and the growth of uniformity. In this way, fast food restaurants exist in Moscow and Java Sparrows breed on Hawaii. Biological homogenization qualifies as a global environmental catastrophe. The Earth has never witnessed such a broad and complete reorganization of species distributions.

Download or read book What s So Good About Biodiversity written by Donald S. Maier and published by Springer Science & Business Media. This book was released on 2012-05-23 with total page 572 pages. Available in PDF, EPUB and Kindle. Book excerpt: There has been a deluge of material on biodiversity, starting from a trickle back in the mid-1980's. However, this book is entirely unique in its treatment of the topic. It is unique in its meticulously crafted, scientifically informed, philosophical examination of the norms and values that are at the heart of discussions about biodiversity. And it is unique in its point of view, which is the first to comprehensively challenge prevailing views about biodiversity and its value. According to those dominant views, biodiversity is an extremely good thing – so good that it has become the emblem of natural value. The book's broader purpose is to use biodiversity as a lens through which to view the nature of natural value. It first examines, on their own terms, the arguments for why biodiversity is supposed to be a good thing. This discussion cuts a very broad and detailed swath through the scientific, economic, and environmental literature. It finds all these arguments to be seriously wanting. Worse, these arguments appear to have consequences that should dismay and perplex most environmentalists. The book then turns to a deeper analysis of these failures and suggests that they result from posing value questions from within a framework that is inappropriate for nature's value. It concludes with a novel suggestion for framing natural value. This new proposal avoids the pitfalls of the ones that prevail in the promotion of biodiversity. And it exposes the goals of conservation biology, restoration biology, and the world's largest conservation organizations as badly ill-conceived.

Download or read book 2004 IUCN Red List of Threatened Species written by Jonathan Baillie and published by IUCN. This book was released on 2004 with total page 228 pages. Available in PDF, EPUB and Kindle. Book excerpt: Applies Red List data to calculate a Red List Index.

Download or read book Biogeography written by Glen MacDonald and published by John Wiley & Sons. This book was released on 2002-02-28 with total page 536 pages. Available in PDF, EPUB and Kindle. Book excerpt: Illustrative examples from recent research publications and "classic" studies are prominently featured throughout the book. Research techniques are highlighted in "special interest" boxes. Illustrations and descriptions of research techniques are provided with examples such as fire-scars from trees used to reconstruct disturbance, fossil pollen used to reconstruct vegetation change and plant migration, transect and quadrate sampling. Includes key biogeographical theories that link space and time to the distribution of life. Some of these theories include: 1. Ranges, Reflicts, Refuges, Corridors, Barriers, 2. Centers of Origins, 3. Cladistics, 4. Variance, 5. Island BioGeography, 6. Diversity Theory, 7. Gap Analysis for Conservation.

Download or read book Towards the Wise Use of Wetlands written by Tim J. Davis and published by . This book was released on 1993 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Animal communities in temperate America written by Victor Ernest Shelford and published by . This book was released on 1913 with total page 390 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book British Prosobranch Molluscs written by Vera Fretter and published by Scion Publishing. This book was released on 1994 with total page 848 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work offers detailed information on British prosobranch molluscs.

Download or read book Minnesota s Forest Resources written by Minnesota. Division of Forestry and published by . This book was released on 2005 with total page 66 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The IUCN Invertebrate Red Data Book written by Sue Wells and published by . This book was released on 1983 with total page 696 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Biology Management and Culture of Walleye and Sauger written by Bruce A. Barton and published by . This book was released on 2011-01-01 with total page 600 pages. Available in PDF, EPUB and Kindle. Book excerpt: