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Dyads of journals related by citations can agglomerate into specialtiesthrough the mechanism of triadic closure. Using the Journal Citation Reports2011, 2012, and 2013, we analyze triad formation as indicators of integration(specialty growth) and disintegration (restructuring). The strongestintegration is found among the large journals that report on studies indifferent scientific specialties, such as PLoS ONE, Nature Communications,Nature, and Science. This tendency towards large-scale integration has not yetstabilized. Using the Islands algorithm, we also distinguish 51 local maxima ofintegration. We zoom into the cited articles that carry the integration for:(i) a new development within high-energy physics and (ii) an emerging interfacebetween the journals Applied Mathematical Modeling and the InternationalJournal of Advanced Manufacturing Technology. In the first case, integration isbrought about by a specific communication reaching across specialty boundaries,whereas in the second, the dyad of journals indicates an emerging interfacebetween specialties. These results suggest that integration picks upsubstantive developments at the specialty level. An advantage of the bottom-upmethod is that no ex ante classification of journals is assumed in the dynamicanalysis.

The Dynamics of Triads in Aggregated Journal-Journal Citation Relations: Specialty Developments at the Above-Journal Level