01936nas a2200181   4500008004100000022001400041245009400055210006900149260001600218300001600234490000800250520136800258100002101626700002101647700001701668700001701685856005201702       2020                        eng d  a0001-496600aFin whale acoustic presence and song characteristics in seas to the southwest of Portugal0 aFin whale acoustic presence and song characteristics in seas to   cJan-04-2020  a2235 - 22490 v1473 a<p>Fin whales were once abundant in the seas to the southwest of Portugal, but whaling activities decreased their numbers considerably. Acoustic data from ocean bottom seismometers provide an opportunity to detect fin whales from their notes, data that would otherwise be logistically challenging and expensive to obtain. Based on inter-note interval and frequency bandwidth, two acoustic patterns produced by fin whales were detected in the study area: pattern 1, described from fin whales in the Mediterranean Sea, and pattern 2, associated with fin whales from the northeast North Atlantic Ocean (NENA). NENA fin whales travel into the western Mediterranean Sea, but the Mediterranean population has not been documented to travel regularly into the NENA. In this study, 11&thinsp;months of acoustic data recorded southwest of Portugal in the NENA were used to characterize 20-Hz fin whale notes into these patterns. Pattern 2 was the most common and occurred mostly in November&ndash;January. Pattern 1 occurred less frequently and mostly in September&ndash;December, February and April, which suggested a limited excursion of whales from the Mediterranean Sea. There were also occasions when the two patterns were recorded simultaneously. Results suggest that fin whales from the NENA and Mediterranean Sea might mix in the area during part of the year.</p>
1 aPereira, Andreia1 aHarris, Danielle1 aTyack, Peter1 aMatias, Luis  uhttp://asa.scitation.org/doi/10.1121/10.0001066