Spatio-temporal patterns in acoustic presence and distribution of Antarctic blue whales Balaenoptera musculus intermedia in the Weddell Sea
Clark, Christopher W.
Van Opzeeland, Ilse
MetadataShow full item record
KeywordPassive acoustic monitoring; Antarctic blue whale; Balaenoptera musculus intermedia; Baleen whale migration; Southern Ocean
Distribution and movement patterns of Antarctic blue whales Balaenoptera musculus intermedia at large temporal and spatial scales are still poorly understood. The objective of this study was to explore spatio-temporal distribution patterns of Antarctic blue whales in the Atlantic sector of the Southern Ocean, using passive acoustic monitoring data. Multi-year data were collected between 2008 and 2013 by 11 recorders deployed in the Weddell Sea and along the Greenwich meridian. Antarctic blue whale Z-calls were detected via spectrogram cross-correlation. A Blue Whale Index was developed to quantify the proportion of time during which acoustic energy from Antarctic blue whales dominated over background noise. Our results show that Antarctic blue whales were acoustically present year-round, with most call detections between January and April. During austral summer, the number of detected calls peaked synchronously throughout the study area in most years, and hence, no directed meridional movement pattern was detectable. During austral winter, vocalizations were recorded at latitudes as high as 69°S, with sea ice cover exceeding 90%, suggesting that some Antarctic blue whales overwinter in Antarctic waters. Polynyas likely serve as an important habitat for baleen whales during austral winter, providing food and reliable access to open water for breathing. Overall, our results support increasing evidence of a complex and non-obligatory migratory behavior of Antarctic blue whales, potentially involving temporally and spatially dynamic migration routes and destinations, as well as variable timing of migration to and from the feeding grounds.
© The Author(s), 2016. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Endangered Species Research 30 (2016): 239-253, doi:10.3354/esr00739.
Suggested CitationEndangered Species Research 30 (2016): 239-253
The following license files are associated with this item:
Showing items related by title, author, creator and subject.
Watkins, William A.; Daher, Mary Ann; George, Joseph E.; Haga, Scott H. (Woods Hole Oceanographic Institution, 2000-12)The seasonal distribution of calling ble whales (Balaenoptera musculus), fin whales (B. physalus), and singing humpback whales (Megaptera novaeangliae) has been analyzed from acoustic data recorded by the U.S. Navy Sound ...
Characterizing Chilean blue whale vocalizations with DTAGs : a test of using tag accelerometers for caller identification Saddler, Mark R.; Bocconcelli, Alessandro; Hickmott, Leigh S.; Chiang, Gustavo; Landea Briones, Rafaela; Bahamonde, Paulina A.; Howes, Gloria; Segre, Paolo S.; Sayigh, Laela S. (Company of Biologists, 2017-09-07)Vocal behavior of blue whales (Balaenoptera musculus) in the Gulf of Corcovado, Chile, was analysed using both audio and accelerometer data from digital acoustic recording tags (DTAGs). Over the course of three austral ...
Stable isotopes reveal winter feeding in different habitats in blue, fin and sei whales migrating through the Azores Silva, Monica A.; Borrell, Asunción; Prieto, Rui; Gauffier, Pauline; Bérubé, Martine; Palsbøll, Per J.; Colaço, Ana (The Royal Society, 2019-08-14)Knowing the migratory movements and behaviour of baleen whales is fundamental to understanding their ecology. We compared δ15N and δ13C values in the skin of blue (Balaenoptera musculus), fin (Balaenoptera physalus) and ...