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Author : Anonim
Publisher : Teacher Created Materials
Page : 34 pages
File Size : 47,5 Mb
Release : 2019-08-15
Category : Juvenile Nonfiction
ISBN : 9780743969017
Author : Ken Meter
Publisher : Island Press
Page : 306 pages
File Size : 52,9 Mb
Release : 2021-04-29
Category : Social Science
ISBN : 9781642831474
Our current food system has decimated rural communities and confined the choices of urban consumers. Even while America continues to ramp up farm production to astounding levels, net farm income is now lower than at the onset of the Great Depression, and one out of every eight Americans faces hunger. But a healthier and more equitable food system is possible. In Building Community Food Webs, Ken Meter shows how grassroots food and farming leaders across the U.S. are tackling these challenges by constructing civic networks. Overturning extractive economic structures, these inspired leaders are engaging low-income residents, farmers, and local organizations in their quest to build stronger communities. Community food webs strive to build health, wealth, capacity, and connection. Their essential element is building greater respect and mutual trust, so community members can more effectively empower themselves and address local challenges. Farmers and researchers may convene to improve farming practices collaboratively. Health clinics help clients grow food for themselves and attain better health. Food banks engage their customers to challenge the root causes of poverty. Municipalities invest large sums to protect farmland from development. Developers forge links among local businesses to strengthen economic trade. Leaders in communities marginalized by our current food system are charting a new path forward. Building Community Food Webs captures the essence of these efforts, underway in diverse places including Montana, Hawai‘i, Vermont, Arizona, Colorado, Indiana, and Minnesota. Addressing challenges as well as opportunities, Meter offers pragmatic insights for community food leaders and other grassroots activists alike.
Author : Kevin S. McCann
Publisher : Princeton University Press
Page : 255 pages
File Size : 50,6 Mb
Release : 2012
Category : Science
ISBN : 9780691134185
This book synthesizes and reconciles modern and classical perspectives into a general unified theory.
Author : Gary A. Polis,Kirk O. Winemiller
Publisher : Springer Science & Business Media
Page : 475 pages
File Size : 44,9 Mb
Release : 2013-04-17
Category : Science
ISBN : 9781461570073
Reflecting the recent surge of activity in food web research fueled by new empirical data, this authoritative volume successfully spans and integrates the areas of theory, basic empirical research, applications, and resource problems. Written by recognized leaders from various branches of ecological research, this work provides an in-depth treatment of the most recent advances in the field and examines the complexity and variability of food webs through reviews, new research, and syntheses of the major issues in food web research. Food Webs features material on the role of nutrients, detritus and microbes in food webs, indirect effects in food webs, the interaction of productivity and consumption, linking cause and effect in food webs, temporal and spatial scales of food web dynamics, applications of food webs to pest management, fisheries, and ecosystem stress. Three comprehensive chapters synthesize important information on the role of indirect effects, productivity and consumer regulation, and temporal, spatial and life history influences on food webs. In addition, numerous tables, figures, and mathematical equations found nowhere else in related literature are presented in this outstanding work. Food Webs offers researchers and graduate students in various branches of ecology an extensive examination of the subject. Ecologists interested in food webs or community ecology will also find this book an invaluable tool for understanding the current state of knowledge of food web research.
Author : S. Pimm
Publisher : Springer Science & Business Media
Page : 231 pages
File Size : 44,9 Mb
Release : 2012-12-06
Category : Science
ISBN : 9789400959255
Often the meanings of words are changed subtly for interesting reasons. The implication of the word 'community' has changed from including all the organisms in an area to only those species at a particular trophic level (and often a taxonomically restricted group), for example, 'bird-community'. If this observation is correct, its probable cause is the dramatic growth in our knowledge of the ecological patterns along trophic levels (I call these horizontal patterns) and the processes that generate them. This book deals with vertical patterns - those across trophic levels -and tries to compensate for their relative neglect. In cataloging a dozen vertical patterns I hope to convince the reader that species interactions across trophic levels are as patterned as those along trophic levels and demand explanations equally forcefully. But this is not the only objective. A limited number of processes shape the patterns of species interaction; to demonstrate their existence is an essential step in understanding why ecosystems are the way they are. To achieve these aims I must resort to both mathematical techniques to develop theories and statistical techniques to decide between rival hypotheses. The level of mathematics is likely to offend nearly everyone. Some will find any mathematics too much, while others will consider the material to be old, familiar ground and probably explained with a poor regard for rigour and generality.
Author : Susan H. Gray
Publisher : Capstone
Page : 26 pages
File Size : 41,5 Mb
Release : 2008
Category : Food chains (Ecology)
ISBN : 9780756532611
An introduction to the system known as the food web, which connects all living things.
Author : Patricia Lauber
Publisher : Turtleback Books
Page : 0 pages
File Size : 50,9 Mb
Release : 1995
Category : Juvenile Nonfiction
ISBN : 0785761012
Explains the concept of a food chain and how plants, animals, and humans are ecologically linked
Author : William Anthony
Publisher : Greenhaven Publishing LLC
Page : 26 pages
File Size : 52,9 Mb
Release : 2020-12-15
Category : Juvenile Nonfiction
ISBN : 9781534535282
The ocean is full of complex food webs made up of many different animals fighting to stay alive within this massive ecosystem. Carnivores, herbivores, and other classified creatures are introduced within the accessible and age-appropriate narrative, which is presented in a conversational tone and creative way. Popular creatures are categorized separately and given detailed descriptions, which allows readers to expand their knowledge of each animal. Helpful graphic organizers provide additional information. Full-color photographs make this an exciting learning experience for all those interested in expanding their knowledge of the science and webs of marine life.
Author : Gary A. Polis,Mary E. Power,Gary R. Huxel
Publisher : University of Chicago Press
Page : 566 pages
File Size : 48,7 Mb
Release : 2004-02-22
Category : Science
ISBN : 9780226673271
Paying special attention to the fertile boundaries between terrestrial, freshwater, and marine ecosystems, this work shows not only what this new methodology means for ecology, conservation, and agriculture but also serves as a fitting tribute to Gary Polis and his major contributions to the field
Author : Paul Fleisher
Publisher : Lerner Publications ™
Page : 40 pages
File Size : 51,8 Mb
Release : 2017-08-01
Category : Juvenile Nonfiction
ISBN : 9781541507081
Prairie dogs, vultures, grasshoppers, goldfinches, pocket gophers, and bison are some of the many animals that make up a grassland food web. But do you know how the many types of grasses in a grassland benefit these animals? Or how earthworms and other decomposers play an important role in the food web? See grassland food webs in action in this fascinating book.
Author : R. L. Kitching
Publisher : Cambridge University Press
Page : 449 pages
File Size : 53,9 Mb
Release : 2000-08-03
Category : Science
ISBN : 9781139428392
The animal communities in plant-held water bodies, such as tree holes and pitcher plants, have become models for food-web studies. In this book, Professor Kitching introduces us to these fascinating miniature worlds and demonstrates how they can be used to tackle some of the major questions in community ecology. Based on thirty years' research in many parts of the world, this work presents much previously unpublished information, in addition to summarising over a hundred years of natural history observations by others. The book covers many aspects of the theory of food-web formation and maintenance presented with field-collected information on tree holes, bromeliads, pitcher plants, bamboo containers and the axils of fleshy plants. It is a unique introduction for the field naturalist and a stimulating source treatment for graduate students and professionals working in the fields of tropical and other forest ecology, as well as entomology.
Author : John C. Moore,Peter C. de Ruiter
Publisher : OUP Oxford
Page : 344 pages
File Size : 52,9 Mb
Release : 2012-05-31
Category : Mathematics
ISBN : 9780191646423
This novel book bridges the gap between the energetic and species approaches to studying food webs, addressing many important topics in ecology. Species, matter, and energy are common features of all ecological systems. Through the lens of complex adaptive systems thinking, the authors explore how the inextricable relationship between species, matter, and energy can explain how systems are structured and how they persist in real and model systems. Food webs are viewed as open and dynamic systems. The central theme of the book is that the basis of ecosystem persistence and stability rests on the interplay between the rates of input of energy into the system from living and dead sources, and the patterns in utilization of energy that result from the trophic interactions among species within the system. To develop this theme, the authors integrate the latest work on community dynamics, ecosystem energetics, and stability. In so doing, they present a unified ecology that dispels the categorization of the field into the separate subdisciplines of population, community, and ecosystem ecology. Energetic Food Webs is suitable for both graduate level students and professional researchers in the general field of ecology. It will be of particular relevance and use to those working in the specific areas of food webs, species dynamics, material and energy cycling, as well as community and ecosystem ecology.
Author : Joel E. Cohen
Publisher : Princeton University Press
Page : 212 pages
File Size : 41,9 Mb
Release : 1978-08-21
Category : Science
ISBN : 0691082022
What is the minimum dimension of a niche space necessary to represent the overlaps among observed niches? This book presents a new technique for obtaining a partial answer to this elementary question about niche space. The author bases his technique on a relation between the combinatorial structure of food webs and the mathematical theory of interval graphs. Professor Cohen collects more than thirty food webs from the ecological literature and analyzes their statistical and combinatorial properties in detail. As a result, he is able to generalize: within habitats of a certain limited physical and temporal heterogeneity, the overlaps among niches, along their trophic (feeding) dimensions, can be represented in a one-dimensional niche space far more often than would be expected by chance alone and perhaps always. This compatibility has not previously been noticed. It indicates that real food webs fall in a small subset of the mathematically possible food webs. Professor Cohen discusses other apparently new features of real food webs, including the constant ratio of the number of kinds of prey to the number of kinds of predators in food webs that describe a community. In conclusion he discusses possible extensions and limitations of his results and suggests directions for future research.
Author : Bobbie Kalman,Jacqueline Langille
Publisher : Crabtree Publishing Company
Page : 36 pages
File Size : 40,6 Mb
Release : 1998
Category : Juvenile Nonfiction
ISBN : 0865058768
Starting with the sun, food chains link together plants and animals in various ecosystems to help them survive. Kids will be fascinated by these chains and their own links to the natural world.
Author : William Anthony
Publisher : Greenhaven Publishing LLC
Page : 26 pages
File Size : 42,8 Mb
Release : 2020-12-15
Category : Juvenile Nonfiction
ISBN : 9781534535206
How do animals in the grasslands eat? Readers discover the answer to this question while learning many other fun facts related to this exciting science curriculum topic. In every ecosystem, including the grasslands, there are a number of different animals, such as carnivores, omnivores, and herbivores. Each animal is part of a specific food web, and these food webs are presented to readers in an accessible visual style and conversational tone. Informative graphic organizers and bright, full-color photographs add to this reading experience for animal lovers.