Results 21 to 30 of about 7,053 (220)

Sperm whale clans and human societies [PDF]

Royal Society Open Science
Sperm whale society is structured into clans that are primarily distinguished by vocal dialects, which may be symbolic markers of clan identity. However, clans also differ in non-vocal behaviour. These distinctive behaviours, as well as clan membership itself, are learned socially, largely within matrilines.
Whitehead H.
openaire   +4 more sources

Summer distribution of the Mediterranean sperm whale: insights from the acoustic Accobams survey initiative

Frontiers in Marine Science, 2023
The Mediterranean sperm whale population, Physeter macrocephalus, is listed as endangered due to population decline caused by human activities. To mitigate the impact of these activities, accurate knowledge of their distribution and abundance is crucial.
Clara Lerebourg, Oliver Boisseau, Vincent Ridoux, Vincent Ridoux, Auriane Virgili   +4 more
doaj   +1 more source

Karyotypes and idiograms of sperm and pygmy sperm whales [PDF]

Hereditas, 2009
The somatic chromosomes of the sperm whale, Physeter catodon L. and the pygmy sperm whale, Kogia breviceps Blainville, were studied. The chromosome number of both species is 2n=42. The sperm and pygmy sperm whales are the only cetaceans, so far recorded, with a chromosome number deviating from 2n=44.
U, Arnason, K, Benirschke
openaire   +2 more sources

Clicking throughout the year: sperm whale clicks in relation to environmental conditions off the west coast of South Africa

Endangered Species Research, 2020
Knowledge of cetacean occurrence and behaviour in southern African waters is limited, and passive acoustic monitoring has the potential to address this gap efficiently. Seasonal acoustic occurrence and diel-vocalizing patterns of sperm whales in relation
Shabangu, FW, Andrew, RK
doaj   +1 more source

Acoustic and foraging behavior of a Baird’s beaked whale, Berardius bairdii, exposed to simulated sonar [PDF]

, 2014
Research was supported by the US Navy Chief of Naval Operations, Environmental Readiness Program, the Office of Naval Research, the Naval Postgraduate School, and the National Research Council.Beaked whales are hypothesized to be particularly sensitive ...
A. K. Stimpert, Friedlaender, A., Calambokidis, John, Calambokidis, J., J. A. Goldbogen, Schorr, Greg, Stimpert, Alison, De Ruiter, Stacy Lynn, Southall, Brandon, A. Friedlaender, Friedlaender, Ari, Stimpert, A.K., Goldbogen, J.A., Moretti, David, D. J. Moretti, J. Calambokidis, G. S. Schorr, Falcone, E.A., Moretti, D.J., DeRuiter, S.L., Southall, B.L., S. L. DeRuiter, Falcone, Erin, Goldbogen, Jeremy, Schorr, G.S., B. L. Southall, E. A. Falcone   +26 more
core   +1 more source

Factors associated with the differential distribution of cetaceans linked with deep habitats in the Western Mediterranean Sea

Scientific Reports, 2022
Deep-habitat cetaceans are generally difficult to study, leading to a limited knowledge of their population. This paper assesses the differential distribution patterns of three deep-habitat cetaceans (Sperm whale—Physeter macrocephalus, Risso’s dolphin ...
Estefanía Torreblanca, José-Carlos Báez, Raimundo Real, David Macías, Salvador García-Barcelona, Francisco Ferri-Yañez, Juan-Antonio Camiñas   +6 more
doaj   +1 more source

Spatial and seasonal patterns in acoustic detections of sperm whales Physeter macrocephalus along the continental slope in the western North Atlantic Ocean

Endangered Species Research, 2018
The distribution and seasonal movements of sperm whales Physeter macrocephalus are poorly understood in the western North Atlantic Ocean, despite a long history of human exploitation of the species. Cetacean surveys in this region are typically conducted
Stanistreet, JE, Nowacek, DP, Bell, JT, Cholewiak, DM, Hildebrand, JA, Hodge, LEW, Van Parijs, SM, Read, AJ   +7 more
doaj   +1 more source

Changes in dive behaviour during naval sonar exposure in killer whales, long-finned pilot whales, and sperm whales. [PDF]

, 2012
Anthropogenic underwater sound in the environment might potentially affect the behavior of marine mammals enough to have an impact on their reproduction and survival.
Tyack, P.L., Fahlman, A., Petter Helgevold Kvadsheim, Miller, P. J. O., Lam, F.P.A., Lam, F. P. A., Andreas eFahlman, F. P. A. Lam, Tyack, Peter L., P. J. O. Miller, Sivle, L.D., Tyack, P. L., Lise Doksæter Sivle, Frans-Peter eLam, Kvadsheim, P.H., Miller, P.J.O., Fahlman, Andreas, Sivle, Lise D, P. H. Kvadsheim, P. L. Tyack, Tyack, Peter Lloyd, Kvadsheim, P. H., Sivle, Lise Doksæter, Patrick eMiller, Miller, Patrick, L. D. Sivle, Miller, Patrick J. O., A. Fahlman, Peter eTyack, Kvadsheim, Petter H, Sivle, L. D., Lam, Frans Peter   +31 more
core   +1 more source

Sperm competition in grey whales

Nature, 1988
SIR-Your legend for the drawing of grey whales taken from Cyall Watson's book Whales of the World, perpetuates the myth that a 'helper' male is necessary for successful mating in this species. The legend states that: "Only one male is involved in the actual mating; the other takes an upright position on the far side of the female, acting as a prop or ...
Ralls, Katherine, Brownell, Robert L., Jr.   +1 more
openaire   +3 more sources

Higher neuron densities in the cerebral cortex and larger cerebellums may limit dive times of delphinids compared to deep-diving toothed whales.

PLoS ONE, 2019
Since the work of Tower in the 1950s, we have come to expect lower neuron density in the cerebral cortex of larger brains. We studied dolphin brains varying from 783 to 6215g. As expected, average neuron density in four areas of cortex decreased from the
Sam H Ridgway, Robert H Brownson, Kaitlin R Van Alstyne, Robert A Hauser   +3 more
doaj   +1 more source