Dear colleagues, we are pleased to announce our new paper:
Thomisch, K, Boebel, O., Clark, C. W., Hagen, W., Spiesecke, S., Zitterbart, D. P., and Van Opzeeland, I. (2016). "Spatio-temporal patterns in acoustic presence and distribution of Antarctic blue whales Balaenoptera musculus intermedia in the Weddell Sea", Endangered Species Research 30, 239-253, doi:10.3354/esr00739 The article is published open-access and can be downloaded from the following link: http://www.int-res.com/abstracts/esr/v30/p239-253/ Abstract: 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. For more information or pdf copy please contact me at [email protected]<mailto:[email protected]> Best wishes, Karolin Thomisch _______________________________________________________________ Karolin Thomisch PhD Student Alfred-Wegener-Institut Helmholz-Zentrum für Polar- und Meeresforschung Ocean Acoustics Lab Am Alten Hafen 26 27568 Bremerhaven GERMANY Phone: +49 (0)471 4831 1032 Mail: [email protected] _______________________________________________________________
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