Journal ArticleDOI
Resources: A Graphical-Mechanistic Approach to Competition and Predation
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A graphical, equilibrium theory of resource competition allows prediction of the outcome of interactions between several consumers for the various classes of resources.Abstract:
The growth response of a population to the resources in a particular environment is used to classify pairs of resources as being either (1) essential, (2) hemi-essential, (3) complementary, (4) perfectly substitutable, (5) antagonistic, or (6) switching. Although nutrition is one important factor determining resource type, the growth response of a population to resources also depends on the interaction between a species' foraging methods and the spatial distribution of the resources. For example, two resources which are nutritionally perfectly substitutable may be operationally switching, antagonistic, or complementary because of spatial heterogeneity. A graphical, equilibrium theory of resource competition allows prediction of the outcome of interactions between several consumers for the various classes of resources. The technique requires information on (1) resource type (growth isoclines), (2) resource preference, (3) resource supply processes, and (4) mortality rates for all species. For all resource ...read more
Citations
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Rebuilding community ecology from functional traits.
TL;DR: It is asserted that community ecology should return to an emphasis on four themes that are tied together by a two-step process: how the fundamental niche is governed by functional traits within the context of abiotic environmental gradients; and how the interaction between traits and fundamental niches maps onto the realized niche in the context a biotic interaction milieu.
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The ecological consequences of changes in biodiversity: a search for general principles101
TL;DR: Lower levels of available limiting resources at higher diversity are predicted to decrease the susceptibility of an ecosystem to invasion, supporting the diversity-invasibility hypothesis.
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Global environmental impacts of agricultural expansion: The need for sustainable and efficient practices
TL;DR: The anticipated next doubling of global food production would be associated with approximately 3-fold increases in nitrogen and phosphorus fertilization rates, a doubling of the irrigated land area, and an 18% increase in cropland, which would have dramatic impacts on the diversity, composition, and functioning of the remaining natural ecosystems.
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Disentangling the importance of ecological niches from stochastic processes across scales
Jonathan M. Chase,Jonathan Myers +1 more
TL;DR: A framework for disentangling the relative importance of deterministic and stochastic processes in generating site-to-site variation in species composition along ecological gradients and among biogeographic regions that differ in the size of the regional species pool is developed.
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Phytoplankton Community Ecology: The Role of Limiting Nutrients
TL;DR: In this article, the role of nutrients and spatial and temporal fluctuations in controlling the species composition, diversity, and seasonal succession of planktonic algal communities is summarized and synthesized.
References
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Book
Stability and Complexity in Model Ecosystems
Robert M. May,N. MacDonald +1 more
TL;DR: Preface vii Preface to the Second Edition Biology Edition 1.
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Resource Partitioning in Ecological Communities
TL;DR: To conclude with a list of questions appropriate for studies of resource partitioning, questions this article has related to the theory in a preliminary way.
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The components of prédation as revealed by a study of small-mammal prédation of the European pine sawfly.
TL;DR: Predation, one such process that affects numbers, forms the subject of the present paper and is based on the density-dependence concept of Smith ( 1955) and the competition theory of Nicholson (1933).