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This journal provides immediate access to some articles. Volume 271(1539); March 22, 2004 The role of subspecies in obscuring avian biological diversity and misleading conservation policy. PMCID: PMC1691635 Global hot spots of biological invasions: evaluating options for ballast-water management. PMCID: PMC1691629 Frequency-dependent incidence in models of sexually transmitted diseases: portrayal of pair-based transmission and effects of illness on contact behaviour. PMCID: PMC1691637 Regional climatic warming drives long-term community changes of British marine fish. PMCID: PMC1691641 | ||