The Salton Sea, California’s largest inland lake, supports a spectacular bird population that is among the most concentrated and most diverse in the world. Sadly, this crucial stopover along the Pacific Flyway for migratory and wintering shorebirds, landbirds, and waterfowl is dangerously close to collapse from several environmental threats. This book is the first thoroughly detailed book to describe the birds of Salton Sea, more than 450 species and subspecies in all. A major contribution to our knowledge about the birds of western North America, it will also be an important tool in the struggle to save this highly endangered area. Synthesizing data from many sources, including observations from their long-term work in the area, the authors’ species accounts discuss each bird’s abundance, seasonal status, movement patterns, biogeographic affinities, habitat associations, and more. This valuable reference also includes general information on the region’s fascinating history and biogeography, making it an unparalleled resource for the birding community, for wildlife managers, and for conservation biologists concerned with one of the most threatened ecosystems in western North America.
This lavishly illustrated book examines the distribution, ecology, conservation status, and biogeography of 176 species of dragonflies in the southern plains of the United States, where twelve ecoregions converge. The topics discussed, such as phenotypic variation and ecology, are applicable and of interest across the United States and much of north America, and will appeal to researchers and dragonfly enthusiasts alike. A series of maps, including a distributional map by specific locality of occurrence, indicate level of documentation and allow the reader to visualize the biogeographical associations of a given species. These maps also encourage citizen scientists to contribute documentation wherever they spend time in the field. Context-driven chapters, including one on the region’s rich paleontological history, blend environmental history and biogeography, giving the book a fresh perspective on the natural world while providing a rich summary of the odonates. Dragonflies at a Biographical Crossroads: The Odonata of Oklahoma and Complexities Beyond Its Borders will be sought out by dragonfly researchers and enthusiasts, entomologists, amateur naturalists, paleontologists, conservation biologists, educators, regional historians, and those seeking to meld the disciplines of cultural and environmental history with biology. It will also be readily accessible to the lay public. Dragonflies combine the visually stunning with acrobatic fireworks in ways no other insect can hope to combine.
Single Best Answer (SBA) examinations are an increasingly popular means of testing medical students and those undertaking postgraduate qualifications in a number of subject areas. Written by a final year medical student, junior doctors and experienced clinicians, 500 Single Best Answers in Medicine provides invaluable guidance from authors who unde
In the first chapter, I compare the impact of lowering tuition prices versus increasing college quality through spending at public 2-year colleges on nearby for-profit 2-year enrollment. I use tuition caps and freezes as well as state budgets shocks affecting state appropriations as instruments for public 2-year spending and tuition. I find no impact of tuition changes on public 2-year enrollment or for-profit 2-year enrollment. However, I find large positive impacts of 2-year public spending on 2-year public enrollment, and negative impacts of 2-year public spending on nearby 2-year for-profit enrollment.In the second chapter, I evaluate the Uncertainty of Outcome Hypothesis (UOH) as well as the superstar effect on viewership in two esports: Counter-Strike: Global Offsensive and Dota 2. I find evidence of uncertainty of outcome on viewership in Counter-Strike, but no evidence of uncertainty of outcome on viewership in Dota 2. I also find evidence of superstars increasing viewership in Counter-Strike as well as Dota 2. The results found in Counter-Strike more closely resemble previous results found in traditional sports than Dota 2.In the final chapter, I analyze how herd composition changes due to drought. There is a common belief that herd composition has been changing as a result of drought. In Tanzania and Uganda, I give evidence that sheep and goats as a share of herd composition are affected 6-9 months after the presence of drought. In terms of precipitation levels, I find that in general, a decrease of 100 mm of monthly precipitation leads to an increase in share of shoats by 10 percentage points (or an increase in share of shoats in TLU units by 5 percentage points) 9 months later.
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