Optimum Timeframes For Detecting Songbird Vocalizations In The Black Hills

The effects on channels of small, low-head seasonal water diversions in the Snake River drainage were investigated. Channels below small diversions were compared to the channels immediately above the same diversions to determine if differences in flow conveyance, substrate sediment size distribution, or streamside vegetation density were present. Estimates of flow conveyance were greater above the diversions, as measured by the area between the edges of vegetation on both banks, and by frequent-flow indicators, which generally approximated bankfull stage. No significant difference in substrate particle size or in channel roughness was found between channels above and below diversions. Although use histories of the diversions were not available, limited observations and conversations with users suggest that many of the diversion structures did not substantially divert high springtime flows so that passage of channel-forming flows probably occurred. Some diversion structures apparently divert or trap a portion of the bedload. Stem diameters of vegetation 6 to 48 inches above the ground were significantly larger above the diversions. Tests of stem densities were not significant. Stratification by substrate, season and size of diversion, community type, and source of summer water may be necessary to properly evaluate the effects of small diversions on vegetation stem density and vigor. The elevation of the edge of vegetation appears to be a viable alternative to frequent flow or bankfull indicators for estimating flow conveyance. It also addresses the question of vegetative encroachment into the channel. Use of the edge of vegetation as a channel feature for flow estimates merits further testing. It appears that the operation of the small forest stream diversions studied has not substantially altered most of the parameters studied. Past hydrographs and historical hydrologic data, however, are needed to fully evaluate the channel and vegetation responses.

The voices of birds have always been a source of fascination. Nature’s Music brings together some of the world’s experts on birdsong, to review the advances that have taken place in our understanding of how and why birds sing, what their songs and calls mean, and how they have evolved. All contributors have strived to speak, not only to fellow experts, but also to the general reader. The result is a book of readable science, richly illustrated with recordings and pictures of the sounds of birds. Bird song is much more than just one behaviour of a single, particular group of organisms. It is a model for the study of a wide variety of animal behaviour systems, ecological, evolutionary and neurobiological. Bird song sits at the intersection of breeding, social and cognitive behaviour and ecology. As such interest in this book will extend far beyond the purely ornithological - to behavioural ecologists psychologists and neurobiologists of all kinds. * The scoop on local dialects in birdsong * How birdsongs are used for fighting and flirting * The writers are all international authorities on their subject

A provocative and urgent essay collection that asks how we can live with hope in “an age of ecocide” Paul Kingsnorth was once an activist—an ardent environmentalist. He fought against rampant development and the depredations of a corporate world that seemed hell-bent on ignoring a looming climate crisis in its relentless pursuit of profit. But as the environmental movement began to focus on “sustainability” rather than the defense of wild places for their own sake and as global conditions worsened, he grew disenchanted with the movement that he once embraced. He gave up what he saw as the false hope that residents of the First World would ever make the kind of sacrifices that might avert the severe consequences of climate change. Full of grief and fury as well as passionate, lyrical evocations of nature and the wild, Confessions of a Recovering Environmentalist gathers the wave-making essays that have charted the change in Kingsnorth’s thinking. In them he articulates a new vision that he calls “dark ecology,” which stands firmly in opposition to the belief that technology can save us, and he argues for a renewed balance between the human and nonhuman worlds. This iconoclastic, fearless, and ultimately hopeful book, which includes the much-discussed “Uncivilization” manifesto, asks hard questions about how we’ve lived and how we should live.

This fascinating book is the first volume in a projected cultural history of the United States, from the earliest English settlements to our own time. It is a history of American folkways as they have changed through time, and it argues a thesis about the importance for the United States of having been British in its cultural origins. While most people in the United States today have no British ancestors, they have assimilated regional cultures which were created by British colonists, even while preserving ethnic identities at the same time. In this sense, nearly all Americans are "Albion's Seed," no matter what their ethnicity may be. The concluding section of this remarkable book explores the ways that regional cultures have continued to dominate national politics from 1789 to 1988, and still help to shape attitudes toward education, government, gender, and violence, on which differences between American regions are greater than between European nations.