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 South Georgia and South Sandwich Islands. Here, two recent records of humpback whales are reported for Maranhão 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 is presented. Phylogenetic analysis placed the stranded animals within the two most common haplogroups 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. Presented results provide evidence of distribution overlap between the humpback whale populations of the northern and southern Atlantic Ocean which will require the development of conservation strategies among neighboring countries and underline the need to develop management strategies that will allow sustainable management of the Amazonian Equatorial Coast.

座头鲸分布世界各地，每年在低纬度和高纬度之间进行繁殖和觅食。在巴西，主要繁殖区包括巴西东部海岸的阿伯罗霍斯银行，该种群的觅食区位于南乔治亚岛和南桑威奇群岛。在这里，据报道亚马逊赤道海岸（AEC）的马拉尼昂州（MaranhãoState）的两头座头鲸最近有记录，其中之一涉及新生小牛和脐带残骸。此外，还提供了对该区域的搁浅和观察记录的深入审查。系统发育分析将被困的动物置于南半球繁殖地（CD和IJ）报道的两个最常见的单倍群中。讨论了物种范围的可能扩展或巴西沿岸历史繁殖区的重新定殖。提出的结果提供了北大西洋和南大西洋的座头鲸种群之间分布重叠的证据，这将需要在邻国之间制定保护策略，并强调需要制定管理策略以实现对亚马逊赤道海岸的可持续管理。