Sharing the space: Review of humpback whale occurrence in the Amazonian Equatorial Coast

Abstract Humpback whales have a cosmopolitan distribution and undertake annual migrations between low and high latitudes where breeding and feeding takes place, respectively. In Brazil, the main breeding area encompasses the Abrolhos Bank at the Eastern Brazilian Coast and the feeding area of this population is located in Georgia and South Sandwich Islands. Here, two recent records of humpback whales are reported to Maranhao state, Amazonian Equatorial Coast (AEC), one of which involves a newborn calf with remains of the umbilical cord. Additionally, an in-depth review of the stranding and observation records for this area are presented. Phylogenetic analysis placed the stranded animals within the two most common haplotypes reported for the Southern Hemisphere breeding grounds (CD and IJ). A possible extension of the species range or the recolonization of a historical breeding area along the Brazilian coast is discussed. Moreover, we present a first evidence of distribution overlap between the humpback whale populations of the northeastern and southeastern Atlantic Ocean which will require the development of concentrated conservation strategies among neighbouring countries and underline the need to develop management strategies that will allow sustainable management of the Amazonian Equatorial Coast.