Stereotypical resting behavior of the sperm whale

  title={Stereotypical resting behavior of the sperm whale},
  author={Patrick J. O. Miller and Kagari Aoki and Luke Rendell and Masao Amano},
  journal={Current Biology},
Summary Though very little is known about sleep in wild cetaceans, toothed cetaceans in captivity sleep with one side of their brain at a time [1]. Such uni-hemispheric sleep is thought to enable swimming, voluntary breathing, predator avoidance and/or social contact during sleep at sea [2,3]. Using suction cup tags, we discovered that sperm whales ( Physeter macrocephalus ) worldwide conduct passive shallow ‘drift-dives' in stereotypical vertical postures just below the sea surface. Bouts of… Expand
Silent porpoise: potential sleeping behaviour identified in wild harbour porpoises
These quiet periods on harbour porpoises need to be considered in studies of anthropogenic effects, but also those employing passive acoustic monitoring techniques, as well as in efforts to reduce incidental bycatch in fisheries, given the associated periods of reduced environmental awareness. Expand
Night-life of Bryde’s whales: ecological implications of resting in a baleen whale
Examining resting patterns of Bryde’s whales found that, while whales were active during daytime making energetic lunges to capture tonnes of plankton, they dedicated much of the night to rest, which suggests that whales may rely on vision to find prey or that prey are less densely aggregated at night making foraging less efficient. Expand
Behaviour and vocalizations of two sperm whales (Physeter macrocephalus) entangled in illegal driftnets in the Mediterranean Sea
The authors' observations indicate that acoustics, respiratory and behavioural parameters may be useful to monitor the physical/physiological status of sperm whales during disentanglement operations. Expand
The seasonal occupancy and diel behaviour of Antarctic sperm whales revealed by acoustic monitoring
Seasonal presence at the three east Antarctic recording sites were in accord with what has been inferred from 20th century whale catches off western Antarctica and from stomach contents of whales caught off South Africa. Expand
Acoustic and diving behavior of sperm whales (Physeter macrocephalus) during natural and depredation foraging in the Gulf of Alaska.
The results suggest that depredation efforts might be measured remotely with passive acoustic monitoring at close ranges with significantly different acoustic behavior than naturally foraging whales. Expand
Responses of male sperm whales (Physeter macrocephalus) to killer whale sounds: implications for anti-predator strategies
The results suggest that, rather than taking advantage of their large aerobic capacities to dive away from the perceived predator, sperm whales responded to killer whale playbacks by interrupting their foraging or resting dives and returning to the surface, changing their vocal production, and initiating a surprising degree of social behaviour in these mostly solitary animals. Expand
Sperm whales reduce foraging effort during exposure to 1-2 kHz sonar and killer whale sounds.
  • S. Isojunno, C. Curé, +4 authors P. Miller
  • Medicine, Environmental Science
  • Ecological applications : a publication of the Ecological Society of America
  • 2016
The results demonstrate that similar to predation risk, exposure to sonar can affect functional behaviors, and indicate that increased perception of risk with higher source level or lower frequency may modulate how sperm whales respond to anthropogenic sound. Expand
Cetacean sleep: An unusual form of mammalian sleep
The suggestion is made that the selection pressure necessitating the evolution of cetacean sleep was most likely the need to offset heat loss to the water from birth and throughout life. Expand
The function of male sperm whale slow clicks in a high latitude habitat: communication, echolocation, or prey debilitation?
Some slow clicks were emitted in seemingly repetitive temporal patterns supporting the hypothesis that the function for slow clicks on the feeding grounds is long range communication between males, possibly relaying information about individual identity or behavioral states. Expand
Behavior and social structure of the sperm whales of Dominica, West Indies
There is substantial geographic variation in the behavior and social structure of sperm whales worldwide. The population in the Eastern Caribbean is thought to be isolated from other areas in theExpand


Sperm whale diving behavior monitored using a suction-cup-attached TDR tag
The diving behavior of a medium-sized female sperm whale off the Kumano Coast, Japan, was studied using a suction-cup-attached TDR (time depth recorder) tag, suggesting that these 2 deep diving cetaceans employ different foraging strategies. Expand
Drift diving in female northern elephant seals: implications for food processing
Predictions from the hypothesis that northern elephant seals drift during the bottom segment of some dives (called C dives) using oxygen saved from reduced locomotion to process food are tested. Expand
Swimming gaits, passive drag and buoyancy of diving sperm whales Physeter macrocephalus
Whales glides more during portions of dives when buoyancy aided their movement, and whales that glided more during ascent glided less during descent (and vice versa), supporting the hypothesis that buoyancy influences behavioural swimming decisions. Expand
Behavioral aspects of sleep in bottlenose dolphin mothers and their calves
The data indicate that dolphin mothers and calves are highly active and vigilant during the initial period of the calf's life, continuously monitoring their position relative to each other by sight during wakefulness and sleep. Expand
Behavioral, neurophysiological and evolutionary perspectives on unihemispheric sleep
A greater understanding of the reasons for little unihemispheric sleep in mammals promises to provide insight into the functions of sleep, in general. Expand
Unihemispheric slow wave sleep and the state of the eyes in a white whale
The data support the idea that unihemispheric sleep allows Cetaceans to monitor the environment and the state of both eyelids during sleep and wakefulness in a sub-adult male white whale over a 4-day-period. Expand
Animal sleep: A review of sleep duration across phylogeny
The present paper examines the literature concerning sleep duration in over 150 animal species, including invertebrates, fish, amphibians, reptiles, birds, and 14 orders of mammals, to evaluate these variables in a wide range of animal species. Expand
Asymmetry and Symmetry in Brain Waves from Dolphin Left and Right Hemispheres: Some Observations after Anesthesia, during Quiescent Hanging Behavior, and during Visual Obstruction
  • S. Ridgway
  • Medicine
  • Brain, Behavior and Evolution
  • 2002
The EEG appeared relatively desynchronized and symmetrical between the two hemispheres when the animal was awake during recovery from pentothal-halothane anesthesia as well as during waking periods when one or both of the animal’s eyes were covered by an opaque rubber suction cup. Expand
Reefs since Columbus
History shows that Caribbean coastal ecosystems were severely degraded long before ecologists began to study them, and loss of megavertebrates dramatically reduced and qualitatively changed grazing and excavation of seagrasses, predation on sponges, loss of production to adjacent ecosystems, and the structure of food chains. Expand
Clues to the functions of mammalian sleep
The functions of mammalian sleep remain unclear. Most theories suggest a role for non-rapid eye movement (NREM) sleep in energy conservation and in nervous system recuperation. Theories of REM sleepExpand