Keystone Species
Mostrando 13-15 de 15 artigos, teses e dissertações.
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13. Environmental response of upper trophic-level predators reveals a system change in an Antarctic marine ecosystem.
Long-term changes in the physical environment in the Antarctic Peninsula region have significant potential for affecting populations of Antarctic krill (Euphausia superba), a keystone food web species. In order to investigate this, we analysed data on krill-eating predators at South Georgia from 1980 to 2000. Indices of population size and reproductive perfo
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14. Polyphasic taxonomy, a consensus approach to bacterial systematics.
Over the last 25 years, a much broader range of taxonomic studies of bacteria has gradually replaced the former reliance upon morphological, physiological, and biochemical characterization. This polyphasic taxonomy takes into account all available phenotypic and genotypic data and integrates them in a consensus type of classification, framed in a general phy
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15. Ehrlichia chaffeensis: a Prototypical Emerging Pathogen
Ehrlichia chaffeensis is an obligately intracellular, tick-transmitted bacterium that is maintained in nature in a cycle involving at least one and perhaps several vertebrate reservoir hosts. The moderate to severe disease caused by E. chaffeensis in humans, first identified in 1986 and reported for more than 1,000 patients through 2000, represents a prototy
American Society for Microbiology.