Search results for ""author john pastor""

MATHEMATICAL ECOLOGY Population ecologists study how births and deaths affect the dynamics of populations and communities, while ecosystem ecologists study how species control the flux of energy and materials through food webs and ecosystems. Although all these processes occur simultaneously in nature, the mathematical frameworks bridging the two disciplines have developed independently. Consequently, this independent development of theory has impeded the cross-fertilization of population and ecosystem ecology. Using recent developments from dynamical systems theory, this advanced undergraduate/graduate level textbook shows how to bridge the two disciplines seamlessly. The book shows how bifurcations between the solutions of models can help understand regime shifts in natural populations and ecosystems once thresholds in rates of births, deaths, consumption, competition, nutrient inputs, and decay are crossed. Mathematical Ecology is essential reading for students of ecology who have had a first course in calculus and linear algebra or students in mathematics wishing to learn how dynamical systems theory can be applied to ecological problems.

Read more less

How long should a leaf live? When should blueberries ripen? And what should a clever moose eat? Questions like these may seem simple or downright strange, yet they form the backbone of natural history, a discipline that fostered some of our most important scientific theories, from natural selection to glaciation. Through careful, patient observations of the organisms that live in an area, their distributions, and how they interact with other species, we gain a more complete picture of the world around us, and our place in it. In What Should a Clever Moose Eat?, John Pastor explores the natural history of the North Woods, an immense and complex forest that stretches from the western shore of Lake Superior to the far coast of Newfoundland. The North Woods is one of the most ecologically and geologically interesting places on the planet, with a host of natural history questions arising from each spruce or sugar maple. From the geological history of the region to the shapes of leaves and the relationship between aspens, caterpillars, and predators, Pastor delves into a captivating range of topics as diverse as the North Woods themselves. Through his meticulous observations of the natural world, scientists and non-scientists alike learn to ask natural history questions and form their own theories, gaining a greater understanding of and love for the North Woods, and other natural places precious to them. In the tradition of Charles Darwin and Henry David Thoreau, John Pastor is a joyful observer of nature who makes sharp connections and moves deftly from observation to theory. Take a walk in John Pastor's North Woods, you'll come away with a new appreciation for details, for the game trails, beaver ponds, and patterns of growth around you, and won't look at the natural world in the same way again.

Read more less