Results 1 to 10 of about 6,484 (191)

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

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

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

Cultural turnover among Galápagos sperm whales [PDF]

Royal Society Open Science, 2016
While populations may wax and wane, it is rare for an entire population to be replaced by a completely different set of individuals. We document the large-scale relocation of cultural groups of sperm whale off the Galápagos Islands, in which two sympatric vocal clans were entirely replaced by two different ones.
Mauricio Cantor, Hal Whitehead, Shane Gero, Luke Rendell   +3 more
openaire   +8 more sources

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

An at-sea assessment of Argos location accuracy for three species of large whales, and the effect of deep-diving behavior on location error

Animal Biotelemetry, 2020
Background Argos satellite telemetry is used globally to track terrestrial and aquatic megafauna, yet the accuracy of this system has been described empirically only for a limited number of species.
Ladd M. Irvine, Martha H. Winsor, Tomas M. Follett, Bruce R. Mate, Daniel M. Palacios   +4 more
doaj   +1 more source

Behaviour and vocalizations of two sperm whales (Physeter macrocephalus) entangled in illegal driftnets in the Mediterranean Sea.

PLoS ONE, 2021
Illegal driftnetting causes each year several entanglements and deaths of sperm whales in different Mediterranean areas, primarily in the Tyrrhenian Sea.
Monica Francesca Blasi, Valentina Caserta, Chiara Bruno, Perla Salzeri, Agata Irene Di Paola, Alessandro Lucchetti   +5 more
doaj   +1 more source

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

Notes on the brain and encephalization quotient of two sperm whales with a synthesis of the literature and indications of a new method of extraction

Natural History Sciences, 2014
The sperm whale (Physeter macrocephalus, Linnaeus 1758) possesses the largest brain that ever existed. Relatively few authors have dealt with it and the available descriptions are heterogeneous, with only few data about brain weight or gross anatomy.
Michele Povinelli, Mattia Panin, Sandro Mazzariol, Maristella Giurisato, Cristina Ballarin, Giulia Roncon, Michela Podestà, Massimo Demma, Bruno Cozzi   +8 more
doaj   +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