TAILIEUCHUNG - From Individuals to Ecosystems 4th Edition - Chapter 15

Chapter 15 Ecological Applications at the Level of Population Interactions: Pest Control and Harvest Management Introduction Humans are very much a part of all ecosystems. Our activities sometimes motivate us to drive towards extinction the species we identify as pests, to kill individuals of species we harvest for food or fiber while ensuring the persistence of their populations. | Chapter 15 Ecological Applications 1 v1 at the Level of Population Interactions Pest Control and Harvest Management Introduction Humans are very much a part of all ecosystems. Our activities sometimes motivate us to drive towards extinction the species we identify as pests to kill individuals of species we harvest for food or fiber while ensuring the persistence of their populations and to prevent the extinction of species we believe to be endangered. The desired outcomes are very different for pest controllers harvest managers and conservation ecologists but all need management strategies based on the theory of population dynamics. Because much of the tool kit developed to manage endangered species is based on the dynamics of individual populations we dealt with species conservation in Chapter 7 at the end of the first section of the book which considered the ecology of individual organisms and single species populations. Pest controllers and harvest managers on the other hand mostly have to deal explicitly with multispecies interactions and their work must be informed by the theory concerning population interactions covered in the book s second section Chapters 8-14 . Pest control and harvest management are the topics of the present chapter. The importance of pest control and harvest management has grown exponentially as the human population has increased see Section and each touches on a different aspect of sustainability . To call an activity sustainable means that it can be continued or repeated for the foreseeable future. Concern has arisen therefore precisely because so much human activity is clearly unsustainable. We cannot continue to use the same pesticides if increasing numbers of pests become resistant to them. We cannot if we wish to have fish to eat in future continue to remove fish from the sea faster than the remaining fish can replace their lost companions. Sustainability has thus become one of the core concepts -perhaps the core concept -

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