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	Provedor de dados Ecology and Society (2) Autor Bhar, Rod; Ottawa-Carleton Institute of Biology; rbhar@ccs.carleton.ca (1) Boughton, David; Pacific Northwest Research Station, U.S. Forest Service; david.boughton@noaa.gov (1) Fahrig, Lenore; Carleton University; lfahrig@ccs.carleton.ca (1) Malvadkar, Urmila; Princeton University; malvadkr@princeton.edu (1) Palavra-chave Biodiversity (2) Dispersal (2) Patchy population (2) Catastrophe (1) Crop pest (1) Crop rotation (1) Disturbance (1) Extinction (1) Fencerow (1) Field margin (1) Hedgerow (1) Landscape (1) Metapopulation (1) Patch dynamics (1) Pest control (1) Shelterbelt (1) Simulation model (1) Succession (1) Woody border. (1) Mais... Tipo do documento Peer-Reviewed Reports (2) Ano 2002 (1) 1998 (1) País Canada (2) Idioma Inglês (2)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 2 Primeira ... 1 ... Última Local vs. Landscape Effects of Woody Field Borders as Barriers to Crop Pest Movement Ecology and Society Bhar, Rod; Ottawa-Carleton Institute of Biology; rbhar@ccs.carleton.ca; Fahrig, Lenore; Carleton University; lfahrig@ccs.carleton.ca. Maintenance of woody borders surrounding crop fields is desirable for biodiversity conservation. However, for crop pest management, the desirability of woody borders depends on the trade-off between their effects at the local field scale and the landscape scale. At the local scale, woody borders can reduce pest populations by increasing predation rates, but they can also increase pest populations by providing complementary habitats and reducing movement rate of pests out of crop fields. At the regional scale, woody borders can reduce pest populations by reducing colonization of newly planted crop fields. Our objective was to develop guidelines for maximizing pest control while maintaining woody borders in the landscape. We wished to determine the... Tipo: Peer-Reviewed Reports Palavras-chave: Biodiversity; Crop pest; Crop rotation; Dispersal; Fencerow; Field margin; Hedgerow; Patchy population; Pest control; Shelterbelt; Simulation model; Woody border.. Ano: 1998 Extinction Risk in Successional Landscapes Subject to Catastrophic Disturbances Ecology and Society Boughton, David; Pacific Northwest Research Station, U.S. Forest Service; david.boughton@noaa.gov; Malvadkar, Urmila; Princeton University; malvadkr@princeton.edu. We explore the thesis that stochasticity in successional-disturbance systems can be an agent of species extinction. The analysis uses a simple model of patch dynamics for seral stages in an idealized landscape; each seral stage is assumed to support a specialist biota. The landscape as a whole is characterized by a mean patch birth rate, mean patch size, and mean lifetime for each patch type. Stochasticity takes three forms: (1) patch stochasticity is randomness in the birth times and sizes of individual patches, (2) landscape stochasticity is variation in the annual means of birth rate and size, and (3) turnover mode is whether a patch is eliminated by disturbance or by successional change. Analytical and numerical analyses of the model suggest that... Tipo: Peer-Reviewed Reports Palavras-chave: Biodiversity; Catastrophe; Dispersal; Disturbance; Extinction; Landscape; Metapopulation; Patch dynamics; Patchy population; Succession. Ano: 2002 Registros recuperados: 2 Primeira ... 1 ... Última

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