Results 41 to 50 of about 6,087 (203)

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

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

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

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

Histochemical indications for a chemically complex signal produced by the cervical gill slit gland of the pygmy sperm whale (Kogia breviceps)

The Anatomical Record, EarlyView.
Abstract The pygmy sperm whale (Kogia breviceps) possesses an exocrine gland associated with its false gill slit pigmentation pattern. The cervical gill slit gland is a compound tubuloalveolar gland that produces a holocrine secretion and displays maturational changes in size and secretory histology. While the morphology of the cervical gill slit gland
Tiffany F. Keenan, William A. McLellan, Sentiel A. Rommel, Alexander M. Costidis, Craig A. Harms, J. G. M. Thewissen, Susan J. Rehorek, David S. Rotstein, Mark D. Gay, Alison R. Taylor, Heather N. Koopman, Ying Wang, Stephanie Kamel, D. Ann Pabst   +13 more
wiley   +1 more source

Approaching a population‐level assessment of body size in pinnipeds using drones, an early warning of environmental degradation

Remote Sensing in Ecology and Conservation, EarlyView.
We present a novel method for the non‐invasive and automatic assessment of harbour seal body condition, using unoccupied aerial vehicles (UAVs/drones), and systematically apply the method to wild seals over 2 years, achieving a near‐population‐level assessment for pups on land (82.5% measured).
Daire Carroll, Eduardo Infantes, Eva V. Pagan, Karin C. Harding   +3 more
wiley   +1 more source

Optimizing power system stability: A hybrid approach using manta ray foraging and Salp swarm optimization algorithms for electromechanical oscillation mitigation in multi‐machine systems

IET Generation, Transmission &Distribution, EarlyView.
This paper presents a TID‐based PSS optimized by MRFOSSA, ensuring robust stability in power systems, validated through WSCC‐3 machines 9‐bus system. Abstract This paper emphasizes the significance of ensuring adequate damping of electromechanical oscillations in power systems to ensure stable operation.
Mohamed H. Hassan, Salah Kamel, Mahmoud A. El‐Dabah, Mohammad A. Abido, Hamed Zeinoddini‐Meymand   +4 more
wiley   +1 more source

Serological Evidence of Cetacean Morbillivirus Infection in Common Bottlenose Dolphins in Japan

Microbiology and Immunology, EarlyView.
ABSTRACT This study revealed that 41.9% of wild‐born Japanese captive dolphins (18 out of 43 dolphins) have neutralizing antibodies specific to cetacean morbillivirus (CeMV). This finding indicates a widespread yet undetected CeMV infection among wild dolphins in the waters around Japan, occurring without notable epidemic or mass mortality of dolphins.
Kaede Tashiro, Takao Segawa, Kiyotaka Konishi, Fumio Seki, Hiroshi Katoh, Toshiaki Ishibashi, Makoto Takeda, Takuya Itou   +7 more
wiley   +1 more source