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Abstract :
[en] Substantial knowledge gaps remain regarding the migratory patterns and broader life history information of many whale species, despite international protection. Recent meta-analyses of passive acoustic sensor networks have provided critical information to understand the distribution of several baleen whale species across the North Atlantic Ocean. However, of the baleen whale species known to regularly inhabit this region, knowledge on common minke whales (Balaenoptera acutorostrata), a species present in Danish waters, remain scarce, particularly at lower latitudes. A large passive acoustic dataset from the Wider Caribbean Region, comprising 92 deployments and over 11,900 recording days between 2001 and 2025, was analyzed using a convolutional neural network-based minke whale pulse train detector. The results provide novel insights into the spatial and temporal distribution of the common minke whale in the tropics and subtropics of the western North Atlantic Ocean. Our findings reveal pronounced spatial and seasonal occurrence patterns, with detections concentrated between 14°–18°N during winter months (December – March). This includes the first acoustic evidence of minke whales in the U.S. Virgin Islands, Dominican Republic, Montserrat, and Guadeloupe. Summer detections at some sites suggest the presence of non-migratory individuals challenging previous assumptions that their presence at lower northern latitudes is limited to the winter months. While detections in the Gulf of Mexico were rare, they represent the first acoustic evidence of the species in the region. Results from this broadscale analysis refine the known winter range and potential breeding grounds of North Atlantic minke whales and underscore the value of passive acoustic monitoring in data-poor and logistically challenging environments. Our findings highlight the need for sustained monitoring to better understand the species’ ecology and inform conservation planning, particularly in important habitats that overlap with growing anthropogenic pressures. The demonstrated presence of minke whales in multiple countries’ waters highlights the need for international coordination for effective minke whales conservation.
