Results 31 to 40 of about 6,166 (199)

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

Stereotypical resting behavior of the sperm whale [PDF]

Current Biology, 2008
SummaryThough 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].
Kagari Aoki, Patrick J. O. Miller, Luke Rendell, Masao Amano   +3 more
openaire   +3 more sources

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

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

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

Audiograms and click spectra of seven novel and seldom-tested odontocetes

Frontiers in Marine Science, 2022
The use of auditory evoked potentials has been promoted as a means by which to collect audiometric information from odontocete cetaceans that are rarely encountered in stranding situations.
Dorian S. Houser, Lauren Noble, Erin Fougeres, Jason Mulsow, James J. Finneran   +4 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

Shipping routes through core habitat of endangered sperm whales along the Hellenic Trench, Greece: Can we reduce collision risks?

PLoS ONE, 2019
The Mediterranean sperm whale population is listed as 'Endangered". The Hellenic Trench is the core habitat of the eastern Mediterranean sperm whale sub-population that numbers two to three hundred individuals.
Alexandros Frantzis, Russell Leaper, Paraskevi Alexiadou, Aristides Prospathopoulos, Dimitrios Lekkas   +4 more
doaj   +1 more source

Occurrence of sperm whale (Physeter macrocephalus) in the Russian Arctic

Polar Research, 2020
We report two sperm whale (Physeter macrocephalus) strandings observed in the south-east corner of the Barents Sea (i.e., Pechora Sea) in 2018, unusually far from the species’ hitherto known distribution.
Igor Popov, Götz Eichhorn
doaj   +1 more source

Acoustic Tracking of Sperm Whales (Physeter macrocephalus) in the Central Mediterranean Sea Using the NEMO-OνDE Deep-Sea Observatory

Journal of Marine Science and Engineering
Passive acoustic monitoring plays a critical role in the study of marine species, particularly in understanding the behavior of deep-diving endangered species like the Mediterranean sperm whale (Physeter macrocephalus).
Letizia Stella Di Mauro, Dídac Diego-Tortosa, Virginia Sciacca, Giorgio Riccobene, Salvatore Viola   +4 more
doaj   +1 more source