The diversity of the earth's climates superimposed upon a complex configuration of physical features has provided the conditions for the evolution of a remarkable array of living things which are linked together into complex ecosystems. The kinds of organisms comprising the ecosystems of the world, and the nature of their interactions, have constantly changed through time due to coevolutionary interactions along with the effects of a continually changing physical environ ment. In recent evolutionary time there has been a dramatic and ever-accelerating rate of change in the configuration of these ecosystems because of the increasing influence of human beings. These changes range from subtle modifications caused by anthropogenically induced alterations in atmospheric properties to the total destruction of ecosystems. Many of these modifications have provided the fuel, food, and fiber which have allowed the expansion of human populations. Unfortunately, there have been many unanticipated changes which accompanied these modifications which have had effects detrimental to human welfare in cluding substantial changes in water and air quality. For example, the use of high-sulfur coal to produce energy in parts of North America is altering the properties of freshwater lakes and forests because of acidification."

How will patterns of human interaction with the earth's eco-system impact on biodiversity loss over the long term--not in the next ten or even fifty years, but on the vast temporal scale be dealt with by earth scientists? This volume brings together data from population biology, community ecology, comparative biology, and paleontology to answer this question.

Rosa Ponselle's place as one of the century's great singers was destined from the moment of her 1918 debut, opposite Enrico Caruso, in the Metropolitan Opera premiere of La forza del destino. For the next two decades, her voice of unparalleled beauty and power continued to mesmerize audiences. Even today, her recordings keep her influence alive in the Italian repertory. Ponselle's path from Meriden, Connecticut, through her apprenticeship on the vaudeville circuit with her sister Carmela to acclaim on the stage of the Met is one of opera's great romantic stories. The author of this centenary biography, James A. Drake, began researching that story in collaboration with Ponselle herself for their 1982 book, Ponselle: A Singer's Life. The present work not only collects many of the interviews with Ponselle that provided the raw material for the earlier biography, but also includes interviews with friends, colleagues, and associates that supplement, support - and sometimes contradict - her own recollections. In addition, the author has scrutinized the documentary record for contemporary reports of these events, and has woven them into a well-crafted, absorbing chronicle of the diva's struggle from New York to Hollywood and abroad. Supplemented with many rare photographs, an updated discography, an extensive bibliography, and a chronology of her vaudeville, operatic, and concert performances, Rosa Ponselle: A Centenary Biography is an invitation to readers to join in the engrossing search for the real Rosa Ponselle.

How will patterns of human interaction with the earth's eco-system impact on biodiversity loss over the long term - not in the next ten or even 50 years, but on the vast temporal scale dealt with by earth scientist?;This text brings together data from population biology, community ecology, comparative biology and paleontology. It starts with an overview of the concept of biodiversity dynamics, explaining why turnover needs to be addressed in terms of scales of time and space and why it is so important to look at speciation and extinction together, as independent processes.;This work is divided into two parts, the first exploring turnover at the species level and the second investigating larger-scale community and ecosystem turnover. Part one has such topics as the relationship of geographic range to diversification and extinction rates, the phylogenetic constraints on evolution of various traits, and the evolution of complexity. In part two, papers focus on subjects such as how fine and course-scale observation of ecosystems often yield widely disparate results, the question of diversity equilibrium over the ages and how evolutionary turnover is crucial to understanding the origins