New publication on humpback whale response to noise
Dear Colleagues, We are happy to announce the publication of our new paper Girola E, Dunlop RA, Noad MJ. 2023 Singing humpback whales respond to wind noise, but not to vessel noise. Proc. R. Soc. B 290: 20230204. https://doi.org/10.1098/rspb.2023.0204 Abstract Animal communication systems evolved in the presence of noise generated by natural sources. Many species can increase the source levels of their sounds to maintain effective communication in elevated noise conditions, i.e. they have a Lombard response. Human activities generate additional noise in the environment creating further challenges for these animals. Male humpback whales are known to adjust the source levels of their songs in response to wind noise, which although variable is always present in the ocean. Our study investigated whether this Lombard response increases when singing males are exposed to additional noise generated by motor vessels. Humpback whale singers were recorded off eastern Australia using a fixed hydrophone array. The source levels of the songs produced while the singers were exposed to varying levels of wind noise and vessel noise were measured. Our results show that, even when vessel noise is dominant, singing males still adjust the source levels of their songs to compensate for the underlying wind noise, and do not further increase their source levels to compensate for the additional noise produced by the vessel. Understanding humpback whales' response to noise is important for developing mitigation policies for anthropogenic activities at sea. The paper can be accessed here https://doi.org/10.1098/rspb.2023.0204 or you can request a pdf copy from the corresponding author (e.girola@uq.edu.au<mailto:e.girola@uq.edu.au>). Best regards Elisa Dr. Elisa Girola The University of Queensland Australia
Dear Colleagues, We are happy to announce the publication of our new paper. Violo et al. 2025. Cetacean habitat use and occurence in Fort-de-France Bay (Martinique). Animals, /15/(18), 2640; https://doi.org/10.3390/ani15182640 Abstract: While coastal species have been widely studied, active port areas in tropical island regions with intense maritime traffic remain critical, but habitats for cetaceans within the Caribbean have not been thoroughly studied. This study examines the spatial and temporal patterns of habitat use and the characteristics of groups of six cetacean species in the Bay of Fort-de-France in Martinique, an area with heavy marine traffic. Data were collected from 2018 to 2022 through systematic boat-based surveys. We analyzed standardized observations of group occurrence, size, behavior, and depth preference across different subzones of the bay. Our results reveal that Stenella attenuata and Stenella longirostris are the most frequently observed species, exhibiting distinct seasonal patterns, while other species occur more sporadically. Group sizes and behavioral patterns vary significantly across zones and depths. Larger, more interactive groups are generally observed in shallow areas. Several species’ preference for nearshore waters highlights the ecological value of the bay and the potential risks posed by anthropogenic pressures, such as noise, collisions, and habitat degradation. Our findings underscore the importance of considering cetacean habitat use in port management strategies. This study provides essential baseline knowledge to support conservation efforts and the development of mitigation measures that reconcile economic activities with the protection of marine biodiversity. The paper can be accessed here https://doi.org/10.3390/ani15182640 Best regards, Benjamin.
participants (2)
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Benjamin de Montgolfier -
Elisa Maria Girola