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A digital acoustic recording tag for measuring the response of wild marine mammals to sound
Definitive studies on the response of marine mammals to anthropogenic sound are hampered by the short surface time and deep-diving lifestyle of many species. A novel archival tag, called the DTAG,
Extreme diving of beaked whales
TLDR
Using current models of breath-hold diving, it is inferred that beaked whales' natural diving behaviour is inconsistent with known problems of acute nitrogen supersaturation and embolism, and possible decompression problems are more likely to result from an abnormal behavioural response to sonar.
MARINE MAMMAL NOISE-EXPOSURE CRITERIA: INITIAL SCIENTIFIC RECOMMENDATIONS
1 National Oceanic and Atmospheric Administration (NOAA), National Marine Fisheries Service, Office of Science and Technology, Marine Ecosystems Division, Ocean Acoustics Program, 1315 East-West
Marine mammal noise exposure criteria: Initial scientific recommendations.
An expert panel reviewed the expanding literature on marine mammal (cetacean and pinniped) auditory and behavioral responses to sound exposure to develop comprehensive, scientifically based noise
Beaked whales echolocate on prey
Beaked whales (Cetacea: Ziphiidea) of the genera Ziphius and Mesoplodon are so difficult to study that they are mostly known from strandings. How these elusive toothed whales use and react to sound
The 20-Hz signals of finback whales (Balaenoptera physalus).
TLDR
Direct association of the bouts with the reproductive season for this species points to the 20-Hz signals as possible reproductive displays by finback whales.
Foraging Blainville's beaked whales (Mesoplodon densirostris) produce distinct click types matched to different phases of echolocation
TLDR
Blainville's beaked whales (Mesoplodon densirostris Blainville) echolocate for prey during deep foraging dives using acoustic tags to demonstrate that these whales produce two distinct types of click sounds during different phases in biosonar-based foraging.
Deep-diving foraging behaviour of sperm whales (Physeter macrocephalus).
TLDR
Similarity in foraging behaviour in the three regions and high diving efficiencies suggest that the success of sperm whales as mesopelagic predators is due in part to long-range echolocation of deep prey patches, efficient locomotion and a large aerobic capacity during diving.
Cheetahs of the deep sea: deep foraging sprints in short-finned pilot whales off Tenerife (Canary Islands).
TLDR
This energetic foraging tactic focused on a single or few prey items has not been observed previously in deep-diving mammals but resembles the high-risk/high-gain strategy of some terrestrial hunters such as cheetahs.
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