Optimal Foraging Theory
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Foraging Theory
Author: David W. Stephens
language: en
Publisher: Princeton University Press
Release Date: 2019-12-31
This account of the current state of foraging theory is also a valuable description of the use of optimality theory in behavioral ecology in general. Organizing and introducing the main research themes in economic analyses of animal feeding behavior, the authors analyze the empirical evidence bearing on foraging models and answer criticisms of optimality modeling. They explain the rationale for applying optimality models to the strategies and mechanics of foraging and present the basic "average-rate maximizing" models and their extensions. The work discusses new directions in foraging research: incorporating incomplete information and risk-sensitive behavior in foraging models; analyzing trade-offs, such as nutrient requirements and the threat of being eaten while foraging; formulating dynamic models; and building constrained optimization models that assume that foragers can use only simple "rules of thumb." As an analysis of these and earlier research developments and as a contribution to debates about the role of theory in evolutionary biology. Foraging Theory will appeal to a wide range of readers, from students to research professionals, in behavioral ecology, population and community ecology, animal behavior, and animal psychology, and especially to those planning empirical tests of foraging models.
Optimal Foraging
Beginning with Emlen (1966) and MacArthur and Pianka (1966) and extending through the last ten years, several authors have sought to predict the foraging behavior of animals by means of mathematical models. These models are very similar, in that they all assume that the fitness of a foraging animal is a function of the efficiency of foraging measured in terms of some "currency" (Schoener, 1971) -usually energy- and that natural selection has resulted in animals that forage so as to maximize this fitness. As a result of these similarities, the models have become known as "optimal foraging models"; and the theory that embodies them, "optimal foraging theory." The situations to which optimal foraging theory has been applied, with the exception of a few recent studies, can be divided into the following four categories: (1) choice by an animal of which food types to eat (i.e., optimal diet); (2) choice of which patch type to feed in (i.e., optimal patch choice); (3) optimal allocation of time to different patches; and (4) optimal patterns and speed of movements. In this review we discuss each of these categories separately, dealing with both the theoretical developments and the data that permit tests of the predictions. The review is selective in the sense that we emphasize studies that either develop testable predictions or that attempt to test such predictions in a precise quantitative manner. We also discuss what we see to be some of the future developments in the area of optimal foraging theory and how this theory can be related to other areas of biology. Our general conclusion is that the simple models so far formulated are supported reasonably well by available data and that we are optimistic about the value both now and in the future of optimal foraging theory. We argue, however, that these simple models will require much modification, especially to deal with situations that either cannot easily be put into one or another of the above four categories or entail currencies more complicated than just energy.
Hunter-Gatherers
Author: Robert L. Bettinger
language: en
Publisher: Springer Science & Business Media
Release Date: 2013-11-11
Hunter-gatherers are the quintessential anthropological topic. They constitute the subject matter that, in the last instance, separates anthropology from its sister social science disciplines: psychology, sociology, economics, and political science. In that central position, hunter-gatherers are the acid test to which any reasonably comprehensive anthropological theory must be applied. Several such theories-some narrow, some broad-are examined in light of the hunter gatherer case in this book. My purpose, then, is that of a review of ideas rather than of a literature. I do not-probably could not-survey all that has been written about hunter-gatherers: Many more works are ignored than considered. That is not because the ones ignored are uninteresting, but because it is my broader purpose to concentrate on certain theoretical contributions to anthro pology in which hunter-gatherers figure most prominently. The book begins with two chapters that deal with the history of anthro pological research and theory in relation to hunter-gatherers. The point is not to present a comprehensive or even-handed accounting of developments. Rather, I sketch a history of selected ideas that have determined the manner in which social scientists have viewed, and thus studied, hunter-gatherers. This lays the groundwork for subjects subsequently addressed and establishes two funda mental points. First, the social sciences have always portrayed hunter-gatherers in ways that serve their theories; in short, hunter-gatherer research has always been a theoretical enterprise. Second, these theoretical treatments have gener ally been either evolutionary or materialist-or both-in perspective.