Mark P. Johnson's research while affiliated with Aarhus University and other places

... ;https://doi.org/10.1101https://doi.org/10. /2023 Current research packages that implement call alignment strategies are either used in matlab (Malinka et al. 2020;Anisimov et al. 2014) or c++ (Gill et al. 2015). However these tools have not, up to now, been adapted for the R environment, a popular programming language among many animal behaviour and bioacoustic researchers. ...

... Li et al. 10.3389/fmars.2022.1014945 beaked whales (Baumann-Pickering et al., 2013;Frantzis et al., 2002;Hildebrand et al., 2015;Warren et al., 2017). An intuitive estimation for the number of cues produced by an individual per unit time can be roughly calculated by simply taking the inverse of the mean ICI. ...

... Our work constitutes a significant contribution to the development of a methodology for monitoring and characterizing underwater soundscapes in a fast and automatic way, thereby complementing previous works on underwater soundscape analysis [71][72][73]. ...

... Since then, numerous types of data loggers have been built and used in the field. Several important parameters that are routinely recorded today, such as body acceleration (13), video images (14), echolocation (15), and GPS position (16), started to be measured Time-depth recorder for seal (8) Inexpensive depth gauge for penguin (9) Small mechanical recorder for seal (10) and penguin (11) Acoustic logger for dolphin (15) Video camera for seal (14), Accelerometer for penguin (13), Geolocator for seabird (19) GPS logger for seabird (16), Implantable logger for tuna (18) Transmitter for salmon (23) Transmitter with various sensors for marine fish (25,26) Transmitter for marine fish (24) ...

... Blainville's beaked whale in Madeira was found to have a restricted ecological niche with preference for warm waters and steep relief areas close to major canyons . In the Canary Islands, Blainville's beaked whales approach the seafloor to feed and have a preferred distribution around 1500 m depth contour (Arranz et al., 2014). Cuvier's beaked whales occur in all archipelagos year-round, but most information is only available for the Canary Islands where the species shows a high level of residency in some islands such as El Hierro, Lanzarote and Fuerteventura (Arranz et al., 2014;Fernández et al., 2013). ...

... Density can be estimated from actually counting animals or, alternatively, from some indicator of an animal's presence, called a cue, such as visual observations of whale blows or recorded acoustic signals (Buckland, 2006;Buckland et al., 2015;Marques et al., 2013). Estimating density from acoustic data is particularly effective for cetaceans; acoustic cues may be more detectable than visual cues because they propagate over longer ranges and can be readily detected by autonomous platforms capable of more persistent monitoring than visual surveys (Barlow et al., 2013;Marques et al., 2013). ...

... The incorporation of inertial sensors in tags enables the estimation of a dead-reckoned track, though these are also imperfect due to additive error in the sensors and ignorance to external forces, e.g. currents (Johnson & Tyack, 2003;Liu, Battaile, Trites, & Zidek, 2015;Schmidt et al., 2007;Shiomi et al., 2010). Irrespective of these errors, pseudo tracks do, however, capture the qualitative nature of animal movement and can be useful in inferring how animals move, rather than where they go; for our purpose, these tracks illustrate the degree to which right whales move horizontally within dives (Figure 7). ...

... cavirostris) off southern California [3], although it is possible that these animals were exposed to Navy sonar during those deployments [3,19,20]. Echolocation clicks used in foraging are produced only below 200 m; whales are typically silent during shallow dives [1,[21][22][23]. The shallow dives were originally believed to help prevent nitrogen gas formation in tissues [24], but occasional extended surface durations, and the ascent and descent rates of shallow dives, suggest that this is not the case [4,25]. ...

... Visualization tools are critical for data exploration and interpretation for animal-borne tags. TrackPlot, a 3D visualization software created by biologists and data visualization experts, facilitated the first detailed description of benthic side-roll feeding by humpback whales and greatly advanced our understanding of complex biomechanics and kinematics [44,[54][55][56]. Existing marine mammal tag visualization tools, such as TrackPlot, Sea Mammal Research Unit's MAMVIS, and Wildlife Computers' Data Portal, are primarily focused on geolocation or kinematic representations of dive behavior and rarely incorporate physiological measurements such as heart rate, which are often recorded using separate dataloggers [13,35,54]. ...

... menerima pantulan suara dari dasar laut atau dari segerombolan ikan yang ada dalam jangkauannya (Arranz et al., 2011). ...