During this secondment Sophie Bertrand and Arnaud Bertrand followed the interactions with the colleagues from the University Federal de Pernambuco (UFPE; in particular Alex da Silva, Moacyr Araujo and Béatrice Padovani) and the University Federal Rural de Pernambuco (UFRPE; in particular Flávia Lucena Frédou, Thierry Frédou and Paulo Travassos) to advance on the state of the art Northeast Brazil (Task 2.1). At this occasion the first draft of the Deliverable 2.1 (Report on tropical Atlantic marine ecosystem dynamics in the last decades) was prepared.