Updated background paper (2018) on the Domain 1 MPA. Part B: rationale of changes

The present document reflects on a series of documents, comments and suggestions made during the intersessional discussions since the D1MPA preliminary proposal was introduced by Argentina and Chile in 2017 at CCAMLR XXXVI. It also includes the suggestions and reviews (WG-EMM, Buenos Aires, 2017; Scientific Committee, Hobart, 2017) proposed by the Expert Group and the information provided for papers discussed during the recent workshop on Spatial management held in Cambridge, 2018. In particular, this document provides detailed information about the rationalization carried out to each suggestion made during the meetings detailed above, and includes new information about the identification of krill areas, scientific references areas, and other research activities such as those focused on Dissostichus spp. The specific changes made to the D1MPA model since the preliminary proposal are discussed in PART A.