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<p class="intro"><span class="citationauthor">Dear colleagues,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Times New Roman",serif">I am pleased to announce the publication of the following open access paper in Bioacoustics:
</span><span style="font-size:12.0pt"><a href="https://www.tandfonline.com/doi/full/10.1080/09524622.2018.1477071"><span style="color:windowtext">https://www.tandfonline.com/doi/full/10.1080/09524622.2018.1477071</span></a><o:p></o:p></span></p>
<p class="MsoNormal"><a href="https://doi.org/10.1080/09524622.2018.1477071"><span style="color:windowtext">https://doi.org/10.1080/09524622.2018.1477071</span></a><o:p></o:p></p>
<h2><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Karin Tubbert Clausen, Jakob Tougaard, Jacob Carstensen, Matthieu Delefosse & Jonas Teilmann (2018): Noise affects porpoise click detections – the magnitude of the effect depends on logger
 type and detection filter settings, Bioacoustics, DOI: 10.1080/09524622.2018.1477071<o:p></o:p></span></h2>
<h2><span style="font-size:12.0pt;font-weight:normal">Abstrac<span style="color:#1F497D">t<o:p></o:p></span></span></h2>
<h2><span style="font-size:12.0pt;background:white;font-weight:normal">Automatic click detectors and full-bandwidth sound recorders are widely used in passive acoustic monitoring of small cetaceans. Detection of these signals depends on a variety of factors,
 including signal to noise ratio. Passive acoustic monitoring is often used to study impact of underwater noise on small cetaceans, but as detection probability is affected by changes in signal to noise ratio, variable noise levels may affect conclusions drawn
 from these experiments. Therefore, we examine how different detectors and filters perform in varying ocean noise conditions. C-PODs and full-bandwidth recorders (Wildlife Acoustics, SM2M+) were deployed at two stations in an environment with fluctuating ambient
 noise for 42 days. Noise level and harbour porpoise (Phocoena phocoena) click trains simultaneously recorded on both loggers were compared. Overall, we found that porpoise click detections by the algorithm used to analyse full-band recorder data (Pamguard)
 paralleled detections by the C-POD. However, Pamguard detected significantly more clicks than the C-POD. A decrease in detections was seen for both loggers with increasing noise in the band 20 –160 kHz, in particular for levels above 100 dB re 1ěPa rms. We
 also found that the Pamguard detection function changed the least over varying noise conditions when compared to the C-POD detectors. This study sheds light on the fact that inference of animal presence/absence or density that are based on echolocation cues
 (here, Porpoise Positive Minutes) shall account for the acoustic environments where probability of detecting signals may be affected by variability in ambient noise levels.</span><span style="font-size:12.0pt;color:#1F497D;font-weight:normal"><o:p></o:p></span></h2>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Times New Roman",serif">Best regards<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Times New Roman",serif">Jonas Teilmann<span style="color:#1F497D"><o:p></o:p></span></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D;mso-fareast-language:EN-GB">_______________________________________________<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D;mso-fareast-language:EN-GB">Jonas Teilmann<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D;mso-fareast-language:EN-GB">Senior Scientist, Ph.D.
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D;mso-fareast-language:EN-GB">Phone: (+45) 21 42 42 91<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D;mso-fareast-language:EN-GB">Fax: (+45) 87 16 87 51<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D;mso-fareast-language:EN-GB">E-mail:
<a href="mailto:jte@bios.au.dk">jte@bios.au.dk</a> <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D;mso-fareast-language:EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D;mso-fareast-language:EN-GB">Marine Mammal Research Section<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D;mso-fareast-language:EN-GB">Department of Bioscience<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="DA" style="color:#1F497D;mso-fareast-language:EN-GB">Aarhus University<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="DA" style="color:#1F497D;mso-fareast-language:EN-GB">Frederiksborgvej 399<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="DA" style="color:#1F497D;mso-fareast-language:EN-GB">DK-4000 Roskilde<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="DA" style="color:#1F497D;mso-fareast-language:EN-GB">Denmark
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="DA" style="color:#1F497D;mso-fareast-language:EN-GB"><a href="http://bios.au.dk/en/about-bioscience/organisation/marine-mammal-research/">http://bios.au.dk/en/about-bioscience/organisation/marine-mammal-research/</a><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="DA" style="color:#1F497D;mso-fareast-language:EN-GB"><a href="https://www.facebook.com/Aarhus-University-Section-for-Marine-Mammal-Research-1481125835511699/">https://www.facebook.com/Aarhus-University-Section-for-Marine-Mammal-Research-1481125835511699/</a><o:p></o:p></span></p>
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