Results 21 to 30 of about 1,032 (159)

Variation in whale (Cetacea) inner ear anatomy reveals the early evolution of "specialized" high-frequency hearing sensitivity. [PDF]

J Anat
Our findings support sensitivity to low‐frequency sound in the archaeocete Zygorhiza kochii and an early toothed mysticete cf. Aetiocetus. Narrow‐band high‐frequency hearing was present in Oligocene odontocetes and stem delphinidans, suggesting it evolved earlier than expected and could represent an ancestral trait rather than a recent innovation ...
Racicot RA, Mourlam MJ, Ekdale EG, Glass A, Marino L, Uhen MD.   +5 more
europepmc   +2 more sources

Maxillary teeth in sperm whales, Physeter macrocephalus (Cetacea: Physeteridae) [PDF]

Journal of Morphological Sciences, 2015
AbstractSperm whales, Physeter macrocephalus Linnaeus, 1758, have 18 to 28 pairs of well developed conical mandibular teeth, but maxillary teeth are vestigial and supposedly rare. The aim of this study is to report a new case of erupted maxillary teeth in P. macrocephalus, the first description for Brazil.
G. Toledo, A. Langguth
openaire   +1 more source

Red‐list status and extinction risk of the world's whales, dolphins, and porpoises

Conservation Biology, Volume 37, Issue 5, October 2023., 2023
Abstract To understand the scope and scale of the loss of biodiversity, tools are required that can be applied in a standardized manner to all species globally, spanning realms from land to the open ocean. We used data from the International Union for the Conservation of Nature Red List to provide a synthesis of the conservation status and extinction ...
Gill T. Braulik, Barbara L. Taylor, Gianna Minton, Giuseppe Notarbartolo di Sciara, Tim Collins, Lorenzo Rojas‐Bracho, Enrique A. Crespo, Louisa S. Ponnampalam, Michael C. Double, Randall R. Reeves   +9 more
wiley   +1 more source

Testing heterochrony: Connecting skull shape ontogeny and evolution of feeding adaptations in baleen whales

Evolution &Development, Volume 25, Issue 4-5, Page 257-273, July 2023., 2023
Changes in Mysticeti skull development are coupled with the evolution of different feeding modes. Species with larger sizes surprisingly have a slower developmental rate (Balaenoptera and Megaptera—rorqual whales), connected with the evolution of lunge filter feeding.
Agnese Lanzetti, Roberto Portela‐Miguez, Vincent Fernandez, Anjali Goswami   +3 more
wiley   +1 more source

An unexpected tenant: contamination in a Physeter catodon (Physeteridae, Artiodactyla) genome indicates undescribed species of Sarcocystis Lankester, 1882 (Sarcocystidae, Eucoccidiorida) in the marine environment [PDF]

Folia Parasitologica, 2022
Data mining animal of genomes has been used before to identify endoparasites, and may be a particularly useful tool to surpass some difficulties faced by studies in the marine environment. We detected a species of Sarcocystis Lankester, 1882, contamination in the sperm whale (Physeter catodon Linnaeus) reference genome available in the GenBank database.
Joaquim Filipe Faria, David James Harris
openaire   +2 more sources

Distinct latitudinal community patterns of Arctic marine vertebrates along the East Greenlandic coast detected by environmental DNA

Diversity and Distributions, Volume 29, Issue 2, Page 316-334, February 2023., 2023
Abstract Aim Greenland is one of the places on Earth where the effects of climate change are most evident. The retreat of sea ice has made East Greenland more accessible for longer periods during the year. East Greenland fjords have been notoriously difficult to study due to their remoteness, dense sea ice conditions and lack of infrastructure.
Mads Reinholdt Jensen, Signe Høgslund, Steen Wilhelm Knudsen, Julius Nielsen, Peter Rask Møller, Søren Rysgaard, Philip Francis Thomsen   +6 more
wiley   +1 more source

Mobilising international resource management certification schemes: Re‐configuration of the global shark fin supply network by producers

Geo: Geography and Environment, Volume 10, Issue 1, January‐June 2023., 2023
Short Abstract The case of Japanese shark fisheries based in Kesennuma, Miyagi shows the full picture of the current global context behind a highly controversial commodity: shark fins. Drawing on this case, this paper analyses the network of cooperative stakeholders to re‐configure a global sustainable commodity network for shark fins.
Reiko Omoto
wiley   +1 more source

Streamlining analysis methods for large acoustic surveys using automatic detectors with operator validation

Methods in Ecology and Evolution, Volume 13, Issue 8, Page 1765-1777, August 2022., 2022
Abstract Passive acoustic surveys are becoming increasingly popular as a means of surveying for cetaceans and other marine species. These surveys yield large amounts of data, the analysis of which is time consuming and can account for a substantial proportion of the survey budget.
Thomas Webber, Douglas Gillespie, Timothy Lewis, Jonathan Gordon, Tararak Ruchirabha, Kirsten F. Thompson   +5 more
wiley   +1 more source

Positive selection in coding regions and motif duplication in regulatory regions of bottlenose dolphin MHC class II genes. [PDF]

PLoS ONE, 2018
The vertebrate immune response is mediated through highly adaptive, quickly evolving cell surface receptors, the major histocompatibility complex (MHC).
Heidi J T Pagán, Tatiana Ferrer, Greg O'Corry-Crowe   +2 more
doaj   +1 more source

The Comparative Anatomy of the Nasal Tract and the Function of the Spermaceti Organ in the Physeteridae (Mammalia, Odontoceti) [PDF]

Bijdragen tot de Dierkunde, 1973
The nasal complex of Kogia has been compared with that of Physeter and shown to be homologouswith that of less specialized ondotocetes. The nasal complex of the Physeterids is structurally related to that of the Platanistids and Ziphioids. The spermaceti organ unique to the Physeteridae forms a part of the functional morphology of the right naris and ...
Schenkkan, E.J., Purves, P.E.
openaire   +2 more sources