SAMBAH (Static Acoustic Monitoring of the Baltic Sea Harbor Porpoise) is an EU LIFE + -funded project with the primary goal of estimating the abundance and distribution of the critically endangered Baltic Sea harbor porpoise. From May 2011 to April 2013, project members in all EU countries around the Baltic Sea undertook a static acoustic survey using 304 porpoise detectors distributed in a randomly positioned systematic grid in waters 5–80 m deep. In the recorded data, click trains originating from porpoises have been identified automatically using an algorithm developed specifically for Baltic conditions. To determine the click train C-POD detection function, a series of experiments have been carried out, including acoustic tracking of wild free ranging porpoises using hydrophone arrays in an area with moored C-PODs and playbacks of porpoise-like signals at SAMBAH C-PODs during various hydrological conditions. Porpoise abundance has been estimated by counting the number of individuals detected in short time interval windows (snapshots), and then accounting for false positive detections, probability of animals being silent, and probability of detection of non-silent animals within a specified maximum range. We describe the method in detail, and how the auxiliary experiments have enabled us to estimate the required quantities.
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October 01 2014
Large-scale static acoustic survey of a low-density population—Estimating the abundance of the Baltic Sea harbor porpoise
Jens C. Koblitz;
Jens C. Koblitz
German Oceanogr. Museum, Katharinenberg 14-20, Stralsund 18439, Germany, Jens.Koblitz@meeresmuseum.de
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Mats Amundin;
Mats Amundin
Kolmården Wildlife Park, Kolmarden, Sweden
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Julia Carlström;
Julia Carlström
AquaBiota Water Res., Stockholm, Sweden
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Len Thomas;
Len Thomas
Ctr. for Res. into Ecological and Environ. Modelling, Univ. of St. Andrews, St. Andrews, United Kingdom
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Ida Carlén;
Ida Carlén
AquaBiota Water Res., Stockholm, Sweden
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Jonas Teilmann;
Jonas Teilmann
Dept. of BioSci., Aarhus Univ., Roskilde, Denmark
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Nick Tregenza;
Nick Tregenza
Chelonia Ltd., Long Rock, United Kingdom
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Daniel Wennerberg;
Daniel Wennerberg
Kolmården Wildlife Park, Kolmarden, Sweden
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Line Kyhn;
Line Kyhn
Dept. of BioSci., Aarhus Univ., Roskilde, Denmark
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Signe Svegaard;
Signe Svegaard
Dept. of BioSci., Aarhus Univ., Roskilde, Denmark
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Monika Kosecka;
Monika Kosecka
Univ. of Gdansk, Gdansk, Poland
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Iwona Pawliczka;
Iwona Pawliczka
Univ. of Gdansk, Gdansk, Poland
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Cinthia Tiberi Ljungqvist;
Cinthia Tiberi Ljungqvist
Kolmården Wildlife Park, Kolmården, Sweden
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Katharina Brundiers;
Katharina Brundiers
German Oceanogr. Museum, Stralsund, Germany
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Andrew Wright;
Andrew Wright
George Mason Univ., Fairfax, VA
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Lonnie Mikkelsen;
Lonnie Mikkelsen
Dept. of BioSci., Aarhus Univ., Roskilde, Denmark
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Jakob Tougaard;
Jakob Tougaard
Dept. of BioSci., Aarhus Univ., Roskilde, Denmark
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Olli Loisa;
Olli Loisa
Turku Univ. of Appl. Sci., Turku, Finland
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Anders Galatius;
Anders Galatius
Dept. of BioSci., Aarhus Univ., Roskilde, Denmark
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Harald Benke
Harald Benke
German Oceanogr. Museum, Stralsund, Germany
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J. Acoust. Soc. Am. 136, 2248 (2014)
Citation
Jens C. Koblitz, Mats Amundin, Julia Carlström, Len Thomas, Ida Carlén, Jonas Teilmann, Nick Tregenza, Daniel Wennerberg, Line Kyhn, Signe Svegaard, Radek Koza, Monika Kosecka, Iwona Pawliczka, Cinthia Tiberi Ljungqvist, Katharina Brundiers, Andrew Wright, Lonnie Mikkelsen, Jakob Tougaard, Olli Loisa, Anders Galatius, Ivar Jüssi, Harald Benke; Large-scale static acoustic survey of a low-density population—Estimating the abundance of the Baltic Sea harbor porpoise. J. Acoust. Soc. Am. 1 October 2014; 136 (4_Supplement): 2248. https://doi.org/10.1121/1.4900114
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