Data/hora: 01/06/2024 07:51:52

Provedor de dados: | 7
País: | Canada
Título: | Variability in Population Abundance is Associated with Thresholds between Scaling Regimes
Autores: | Wardwell, Donald; Nebraska Cooperative Fish and Wildlife Research Unit; don_wardwell@hotmail.com; Allen, Craig R; U.S. Geological Survey; Nebraska Cooperative Fish and Wildlife Research Unit; allencr@unl.edu.
Data: | 2009-12-18
Ano: | 2009
Palavras-chave: | Body mass; Breeding Bird Survey; Everglades; Phase transition; Scale; Textural discontinuity hypothesis.
Resumo: | Discontinuous structure in landscapes may result in discontinuous, aggregated species body-mass patterns, reflecting the scales of structure available to animal communities within a landscape. The edges of these body-mass aggregations reflect transitions between available scales of landscape structure. Such transitions, or scale breaks, are theoretically associated with increased biological variability. We hypothesized that variability in population abundance is greater in animal species near the edge of body-mass aggregations than it is in species that are situated in the interior of body-mass aggregations. We tested this hypothesis by examining both temporal and spatial variability in the abundance of species in the bird community of the Florida Everglades sub-ecoregion, USA. Analyses of both temporal and spatial variability in population abundance supported our hypothesis. Our results indicate that variability within complex systems may be non-random, and is heightened where transitions in scales of process and structure occur. This is the first explicit test of the hypothetical relationship between increased population variability and scale breaks.
Tipo: | Peer-Reviewed Reports
Idioma: | Inglês
Identificador: | vol14/iss2/art42/
Editor: | Resilience Alliance
Formato: | text/html application/pdf
Fonte: | Ecology and Society; Vol. 14, No. 2 (2009)