02981nas a2200253   4500008004100000020001800041245009800059210006900157300000800226520217600234653001402410653001802424653003102442653001302473653002402486653002502510653002602535653003802561653001002599653001802609653001502627100001802642856006702660       2018                        eng d  a978035566050000aImpacts of Ambient Noise on Minke Whale (Balaenoptera acutorostrata) Habitat Use and Behavior0 aImpacts of Ambient Noise on Minke Whale Balaenoptera acutorostra  a1713 a<p>This study examines the soundscape of minke whale habitat in the Scottish Inner Hebrides around the islands of Mull, Coll and Muck and near the Ardnamurchan Peninsula of the Scottish mainland. To compare the soundscape with minke whale presence and behavior, acoustic recordings were paired with behavior and respiration data. Acoustic recordings were taken using a Soundtrap 300, deployed from a whale watching vessel. Data was taken from June - September 2016. The soundscape was analyzed by comparing power spectral density averaged into octave bands (center frequencies from 16 Hz &ndash; 128 kHz). The soundscape of the region is ephemeral, with some locations having very different acoustic patterns depending on transient animal and human activity. Humans contribute to the soundscape through movement of small ships and dredging. Notable biological contributors to the soundscape include dolphins and snapping shrimp. Outside the island of Coll is quieter at mid-frequencies (2-8 kHz octave bands). Inside Coll is quieter at frequencies in the 16-128 kHz octave bands. Ardmore point, in the Sound of Mull, is louder for most frequencies. These differences create a potential way for animals to navigate or orient based on sound. Observed minke whale behaviors were categorized into behavior states to create a behavior budget. Minke whales in this area spend 56% of their daytime feeding, 7% traveling and 39% in other activities. The average inter-breath interval for minke whales in this study was 60.7s. Minke presence and behavior were compared with sound levels in 1/3rd octave bands using generalized linear models. Minke whale presence and behavior both correlate with changes in the Soundscape. Minke whales are less likely to be seen with higher levels of low (31 Hz) and high (25.4 kHz) frequency sound. Higher levels of sound at low (63 Hz) frequencies were associated with lower probability of minke whales feeding. Higher probability of minke whales feeding in higher levels of high (25.4 kHz) frequency sound may indicate that minke whales are optimizing that time which is spent in regions with higher levels of noise at these frequencies.</p>
10aacoustics10aambient noise10aBalaenoptera acutorostrata10aBehavior10abiological sciences10aConservation biology10aEnvironmental science10aHealth and environmental sciences10aMinke10aPure sciences10aSoundscape1 aRoland, Adele  uhttps://search.proquest.com/docview/2020840628?accountid=1518102098nas a2200229   4500008004100000245010100041210006900142260001600211520135800227653003101585653002501616653002001641653002001661653001601681653001201697653002201709100002301731700002401754700001901778700002801797856004301825       2017                        eng d00aEstimation of minke whale abundance from an acoustic line transect survey of the Mariana Islands0 aEstimation of minke whale abundance from an acoustic line transe  cJan-03-20173 a<p>The minke whale is one of the most abundant species of baleen whales worldwide, yet is rarely sighted in subtropical waters. In the North Pacific, they produce a dis- tinctive sound known as the &ldquo;boing,&rdquo; which can be used to acoustically localize indi- viduals. A vessel-based survey using both visual and passive acoustic monitoring was conducted during the spring of 2007 in a large (616,000 km 2 ) study area encom- passing the Mariana Islands. We applied line transect methods to data collected from a towed hydrophone array to estimate the abundance of calling minke whales in our study area. No minke whales were sighted, but there were hundreds of acoustic detections of boings. Computer algorithms were developed to localize calling minke whales from acoustic recordings, resulting in over 30 independent localizations, a six-fold increase over those estimated during the survey. The two best estimates of abundance of calling minke whales were determined to be 80 and 91 animals (0.13 and 0.15 animals per 1,000 km2, respectively; CV = 34%). These are the first den- sity and abundance estimates for calling minke whales using towed hydrophone array surveys, and the first estimates for this species in the Mariana Islands region. These are considered minimum estimates of the true number of minke whales in the study area.</p>
10aBalaenoptera acutorostrata10adensity esti- mation10aMariana Islands10amarine mammals.10aminke whale10aPacific10apassive acoustics1 aNorris, Thomas, F.1 aDunleavy, Kerry, J.1 aYack, Tina, M.1 aFerguson, Elizabeth, L.  uhttp://doi.wiley.com/10.1111/mms.12397