Abstract
The development of high‐resolution archival tag technologies has revolutionized our understanding of diving behavior in marine taxa such as sharks, turtles, and seals during their wide‐ranging movements. However, similar applications for large whales have lagged behind due to the difficulty of keeping tags on the animals for extended periods of time. Here, we present a novel configuration of a transdermally attached biologging device called the Advanced Dive Behavior (ADB) tag. The ADB tag contains sensors that record hydrostatic pressure, three‐axis accelerometers, magnetometers, water temperature, and light level, all sampled at 1 Hz. The ADB tag also collects Fastloc GPS locations and can send dive summary data through Service Argos, while staying attached to a whale for typical periods of 3–7 weeks before releasing for recovery and subsequent data download. ADB tags were deployed on sperm whales (Physeter macrocephalus; N = 46), blue whales (Balaenoptera musculus; N = 8), and fin whales (B. physalus; N = 5) from 2007 to 2015, resulting in attachment durations from 0 to 49.6 days, and recording 31 to 2,539 GPS locations and 27 to 2,918 dives per deployment. Archived dive profiles matched well with published dive shapes of each species from short‐term records. For blue and fin whales, feeding lunges were detected using peaks in accelerometer data and matched corresponding vertical excursions in the depth record. In sperm whales, rapid orientation changes in the accelerometer data, often during the bottom phase of dives, were likely related to prey pursuit, representing a relative measure of foraging effort. Sperm whales were documented repeatedly diving to, and likely foraging along, the seafloor. Data from the temperature sensor described the vertical structure of the water column in all three species, extending from the surface to depths >1,600 m. In addition to providing information needed to construct multiweek time budgets, the ADB tag is well suited to studying the effects of anthropogenic sound on whales by allowing for pre‐ and post‐exposure monitoring of the whale's dive behavior. This tag begins to bridge the gap between existing long‐duration but low‐data throughput tags, and short‐duration, high‐resolution data loggers.
Highlights
Understanding how animals use their environment at multiple scales is a key goal in behavioral ecology
We describe the development through four generations of the Advanced Dive Behavior (ADB) tag, a spatially explicit, high- resolution (1-H z) data logger for large whales capable of staying attached for intermediate time periods
The ADB tag is a novel configuration of the Wildlife Computers (Seattle, Washington, USA) Mk10-PATF pop-up archival time-depthrecorder tag
Summary
Understanding how animals use their environment at multiple scales is a key goal in behavioral ecology. While high-resolution data loggers can record relatively large amounts of information on dive behavior, they cannot be used to characterize how that behavior changes over time due to the short-attachment duration This knowledge gap represents the frontier in technology development for whale research, in the face of the growing need to document how these sensitive species might respond to various sources of anthropogenic disturbance such as noise from commercial vessel traffic, mid-frequency naval sonar, or seismic exploration vessels (Nowacek, Thorne, Johnston, & Tyack, 2007; Soto et al, 2006; Southall et al, 2007) beyond short-term responses (DeRuiter et al, 2013; Goldbogen, Calambokidis et al, 2013; Goldbogen, Southall et al, 2013). The data records obtained from this tag will dramatically advance our understanding of cetacean ecology
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