Il fascicolo di Oikos, Vol. 108, n. 1, gennaio 2005, dedica alcuni articoli al problema dei meccanismi della speciazione ed esplora le dinamiche evolutive ed ecologiche delle specie periferiche di una popolazione. Questi sono i temi discussi: Species’ borders: a unifying theme in ecology Robert D. Holt; Timothy H. Keitt Species’ geographic ranges and distributional limits: pattern analysis and statistical issues M.-J. Fortin; T. H. Keitt; B. A. Maurer; M. L. Taper; Dawn M. Kaufman; T. M. Blackburn Theoretical models of species’ borders: single species approaches Robert D. Holt; Timothy H. Keitt; Mark A. Lewis; Brian A. Maurer; Mark L. Taper The community context of species’ borders: ecological and evolutionary perspectives Ted J. Case; Robert D. Holt; Mark A. McPeek; Timothy H. Keitt Spatial-temporal population dynamics across species range: from centre to margin Qinfeng Guo; Mark Taper; M. Schoenberger; J. Brandle Empirical perspectives on species borders: from traditional biogeography to global change Camille Parmesan; Steve Gaines; Laura Gonzalez; Dawn M. Kaufman; Joel Kingsolver; A. Townsend Peterson; Rafe Sagarin