Bibliometry of marine science and limnology publications (1979-2015) by the Centro de Investigación en Ciencias del Mar y Limnología (CIMAR), Universidad de Costa Rica

Bibliometrics play a significant role in evaluating the scientific production of journals and research units such as universities and research centers. The present study aimed to analyze the scientific production of CIMAR (Center for Research in Marine Science and Limnology) from its foundation in 1979 to 2015. We analyzed exclusively articles published in journals and selected those with at least one author affiliated to CIMAR. For the analysis, each article was classified according to the geographical study area, the topic of the investigation, ecosystem, and taxonomic group. We analyzed the following variables: year of publication, language, journal name, and authors. In this study, we analyzed the Bradford distribution, citations, the impact factor, and the quartiles of the journals where papers were published. During the study period, CIMAR produced a total of 791 publications: 624 articles, 90 book chapters or books, 48 booklets, and 34 special issues of the journal Revista de Biología Tropical (RBT). The number of publications showed an increasing trend during the study period, and most articles were written in English (58.3 %) and Spanish (41.7 %). A total of 128 journals were selected to publish CIMAR’s contributions. According to the Bradford method, the journal RBT is in Zone I (major productivity or concentration), with 49.8 % of the total scientific production. In relation to authorship, 22 authors with 12 articles or more are registered, and 80 % of the articles have been published by authors with a low (42 authors) and medium productivity level (44 authors). CIMAR published 81.6 % regarding marine topics and 18.4 % about limnology. Most of the articles (51.9 %) dealt with the Pacific of Costa Rica, 13.5 % with the Caribbean and 34.7 % referred to other study locations. The publications of CIMAR were mainly about ecology (33.3 %), taxonomy (24.5 %) and oceanography/meteorology (12.7 %). CIMAR has a highly trained and specialized staff that has gained experience and is contributing to the implementation and evaluation of Costa Rica’s science, technology and innovation policies through both interdisciplinary research and the development of institutional as well as professional capacities in a framework of dialogue and public-private agreements.

A technique to identify core journals for neurosurgery using citation scatter analysis and the Bradford distribution across neurosurgery journals

Object The volume of scientific literature doubles approximately every 7 years. The coverage of this literature provided by online compendia is variable and incomplete. It would hence be useful to identify “core” journals in any field and validate whether the h index and impact factor truly identify the core journals in every subject. The core journals in every medical specialty would be those that provide a current and comprehensive coverage of the science in that specialty. Identifying these journals would make it possible for individual physicians to keep abreast of research and clinical progress. Methods The top 10 neurosurgical journals (on the basis of impact factor and h index) were selected. A database of all articles cited in the reference lists of papers published in issues of these journals published in the first quarter of 2012 was generated. The journals were ranked based on the number of papers cited from each. This citation rank list was compared with the h index and impact factor rank lists. The rank list was also examined to see if the concept of core journals could be validated for neurosurgical literature using Bradford's law. Results A total of 22,850 papers spread across 2522 journals were cited in neurosurgical literature over 3 months. Although the top 10 journals were the same, irrespective of ranking criterion (h index, impact factor, citation ranking), the 3 rank lists were not congruent. The top 25% of cited articles obeyed the Bradford distribution; beyond this, there was a zone of increased scatter. Six core journals were identified for neurosurgery. Conclusions The core journals for neurosurgery were identified to be Journal of Neurosurgery, Neurosurgery, Spine, Acta Neurochirurgica, Stroke, and Journal of Neurotrauma. A list of core journals could similarly be generated for every subject. This would facilitate a focused reading to keep abreast of current knowledge. Collated across specialties, these journals could depict the current status of medical science.