The demographic significance of ‘sink’ populations

摘要: Abstract Rates of reproduction and mortality undoubtedly vary across the ranges most species. Local demographic ‘sources’, where exceeds mortality, may subsidize non-sustaining ‘sink’ subpopulations, local fails to compensate for mortality. We examine model metapopulations sources sinks, connected by intrinsic dispersal juveniles density-dependent adults or juveniles. Results show that a large but finite proportion metapopulation might reside in subpopulations. Although these sinks are unable persist independently, they contribute significantly size longevity. Our analysis leads several recommendations conservation natural populations: (1) demographically productive subpopulations need be identified protected; (2) buffer habitats marginal should part comprehensive plans; (3) long-term status even seemingly secure carefully monitored.