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201 results for “Cetaceans”
FIG. 10 in Monstrosities from the Sea. Taxonomy and tradition in Conrad Gessner's (1516-1565) discussion of cetaceans and sea-monsters
FIG. 10. — Episcopus marinus, sea-bishop. Conrad Gessner (1558: 520). Bayerische Staatsbibliothek München, Rar. 2234.
FIG. 8 in Monstrosities from the Sea. Taxonomy and tradition in Conrad Gessner's (1516-1565) discussion of cetaceans and sea-monsters
FIG. 8. — Monstrous whale mistaken for an island. Conrad Gessner (1558: 138). Bayerische Staatsbibliothek München, Rar. 2234.
FIG. 7. — Monstrous whale attacking a in Monstrosities from the Sea. Taxonomy and tradition in Conrad Gessner's (1516-1565) discussion of cetaceans and sea-monsters
FIG. 7. — Monstrous whale attacking a ship. Conrad Gessner (1558: 138). Bayerische Staatsbibliothek München, Rar. 2234.
FIG. 2 in Monstrosities from the Sea. Taxonomy and tradition in Conrad Gessner's (1516-1565) discussion of cetaceans and sea-monsters
FIG. 2. — Simia marina, sea-monkey. Conrad Gessner (1558: 1054). Bayerische Staatsbibliothek München, Rar. 2234.
FIG. 5 in Monstrosities from the Sea. Taxonomy and tradition in Conrad Gessner's (1516-1565) discussion of cetaceans and sea-monsters
FIG. 5. — Cetus britannicus, English whale. Conrad Gessner (1558: 251). Bayerische Staatsbibliothek München, Rar. 2234.
Data from: Morphology, molecules, and the phylogenetics of cetaceans
Recent phylogenetic analyses of cetacean relationships based on DNA sequence data have challenged the traditional view that baleen whales (Mysticeti) and toothed whales (Odontoceti) are each monophyletic, arguing instead that baleen whales are the sister group of the odontocete family Physeteridae (sperm whales). We reexamined this issue in light of a morphological data set composed of 207 characters and molecular data sets of published 12S, 16S, and cytochrome b mitochondrial DNA sequences. We reach four primary conclusions: (1) Our morphological data set strongly supports the traditional view of odontocete monophyly; (2) the unrooted molecular and morphological trees are very similar, and most of the conflict results from alternative rooting positions; (3) the rooting position of the molecular tree is sensitive to choice of artiodactyl outgroup taxa and the treatment of two small but ambiguously aligned regions of the 12S and 16S sequences, whereas the morphological root is strongly supported; and (4) combined analyses of the morphological and molecular data provide a well-supported phylogenetic estimate consistent with that based on the morphological data alone (and the traditional view of toothed-whale monophyly) but with increased bootstrap support at nearly every node of the tree.
Data from: Comparative analysis of encephalization in mammals reveals relaxed constraints on anthropoid primate and cetacean brain scaling
There is a well-established allometric relationship between brain and body mass in mammals. Deviation of relatively increased brain size from this pattern appears to coincide with enhanced cognitive abilities. To examine whether there is a phylogenetic structure to such episodes of changes in encephalization across mammals, we used phylogenetic techniques to analyse brain mass, body mass and encephalization quotient (EQ) among 630 extant mammalian species. Among all mammals, anthropoid primates and odontocete cetaceans have significantly greater variance in EQ, suggesting that evolutionary constraints that result in a strict correlation between brain and body mass have independently become relaxed. Moreover, ancestral state reconstructions of absolute brain mass, body mass and EQ revealed patterns of increase and decrease in EQ within anthropoid primates and cetaceans. We propose both neutral drift and selective factors may have played a role in the evolution of brain–body allometry.
Data from: Morphology of the core fibrous layer of the cetacean tail fluke
The cetacean tail fluke blades are not supported by any vertebral elements. Instead, the majority of the blades are composed of a densely packed collagenous fiber matrix known as the core layer. Fluke blades from six species of odontocete cetaceans were examined to compare the morphology and orientation of fibers at different locations along the spanwise and chordwise fluke blade axes. The general fiber morphology was consistent with a three‐dimensional structure comprised of two‐dimensional sheets of fibers aligned tightly in a laminated configuration along the spanwise axis. The laminated configuration of the fluke blades helps to maintain spanwise rigidity while allowing partial flexibility during swimming. When viewing the chordwise sectional face at the leading edge and mid‐chord regions, fibers displayed a crossing pattern. This configuration relates to bending and structural support of the fluke blade. The trailing edge core was found to have parallel fibers arranged more dorso‐ventrally. The fiber morphology of the fluke blades was dorso‐ventrally symmetrical and similar in all species except the pygmy sperm whale (Kogia breviceps), which was found to have additional core layer fiber bundles running along the span of the fluke blade. These additional fibers may increase stiffness of the structure by resisting tension along their long spanwise axis.
Dataset for "Alveoli, teeth, and tooth loss: Understanding the homology of internal mandibular structures in mysticete cetaceans"
<p>ZIP folders containing STL files of USNM specimens for Peredo et al.</p>
Fig. 2 in Distribution Of Small Cetaceans In The Nearshore Waters Of Sarawak, East Malaysia
Fig. 2. Survey tracks (total track, including on- and off-effort portions) and sightings (on- and off-effort) in the three main survey areas of (a) Miri, (b) Similajau, and (c) Kuching.
FIG. 8 in A new platyrostrine sperm whale from the Early Miocene of the southeastern Pacific (East Pisco Basin, Peru) supports affinities with the southwestern Atlantic cetacean fauna
FIG. 8. — Time-calibrated strict consensus tree of 1584 most parsimonious trees with a length of 184 steps, a consistency index of 0.46, and a homoplasy index of 0.54, resulting from the analysis with equal-weighting, describing the sister-group relationship between Diaphorocetus poucheti (Moreno, 1892) and Diaphorocetus ortegai n. sp. among stem Physeteroidea. Relationships within Kogiidae are collapsed. Bootstrap values higher than 50 are indicated at nodes. Inset: part of the Adams consensus tree illustrating partly resolved relationships between Cozzuoliphyseter rionegrensis (Gondar, 1975), Diaphorocetus spp., and Placoziphius duboisi Van Beneden, 1869. See the Material and methods section for information on chronostratigraphic ranges.
Supplementary material 1 from: Costa AF, Siciliano S, Emin-Lima R, Martins BML, Sousa MEM, Giarrizzo T, Silva Júnior JS (2017) Stranding survey as a framework to investigate rare cetacean records of the north and north-eastern Brazilian coasts. ZooKeys 688: 111-134. https://doi.org/10.3897/zookeys.688.12636
S1 Movie : Explanation note: Dolphins trapped at Praia da Corvina, Salinópolis (MOV).
Supplementary material 3 from: Costa AF, Siciliano S, Emin-Lima R, Martins BML, Sousa MEM, Giarrizzo T, Silva Júnior JS (2017) Stranding survey as a framework to investigate rare cetacean records of the north and north-eastern Brazilian coasts. ZooKeys 688: 111-134. https://doi.org/10.3897/zookeys.688.12636
S3 Movie : Explanation note: Dolphin stranded at Praia da Travosa, Santo Amaro (MOV)
Supplementary material 2 from: Costa AF, Siciliano S, Emin-Lima R, Martins BML, Sousa MEM, Giarrizzo T, Silva Júnior JS (2017) Stranding survey as a framework to investigate rare cetacean records of the north and north-eastern Brazilian coasts. ZooKeys 688: 111-134. https://doi.org/10.3897/zookeys.688.12636
S2 Movie : Explanation note: Rescue Guiana dolphins trapped at Praia da Corvina, Salinópolis (MOV).
Figure 5 from: Costa AF, Siciliano S, Emin-Lima R, Martins BML, Sousa MEM, Giarrizzo T, Silva Júnior JS (2017) Stranding survey as a framework to investigate rare cetacean records of the north and north-eastern Brazilian coasts. ZooKeys 688: 111-134. https://doi.org/10.3897/zookeys.688.12636
Figure 5 - Cluster analysis of cetacean stranding and sighting records. Diagram of cetaceans reported from the north-eastern (inverted triangle) and north coast of Brazil (triangle) and southern Caribbean (square), reported in seven articles and the present study. The two distinct groups formed (Group 1 and 2) are indicated. A similarity profile (SIMPROF) permutation test highlights dashed clusters that show significant internal structure. Shaded cells indicate occurrence of species.
Figure 4 from: Costa AF, Siciliano S, Emin-Lima R, Martins BML, Sousa MEM, Giarrizzo T, Silva Júnior JS (2017) Stranding survey as a framework to investigate rare cetacean records of the north and north-eastern Brazilian coasts. ZooKeys 688: 111-134. https://doi.org/10.3897/zookeys.688.12636
Figure 4 - Stranding events: small and medium-sized cetaceans. a The carcass of a Fraser's dolphin, Lagenodelphis hosei was cut down on the village of Carnaubeira, Araioses municipality (2°42.6'S, 42°0.6'W) and consumed locally (photo PROCEMA files) b A group of 12 live Guiana dolphins Sotalia guianensis were found trapped (photo showed just one specimen) in a tidal channel alongside Corvina beach, Salinópolis municipality, eastern Pará (0°36'S, 47°22.2'W) c A False killer whale Pseudorca crassidens stranded on the north-eastern coast of Pará, Praia de Marudá, Marapanim municipality (photo GEMAM files) d A Short-finned pilot whale Globicephala macrorhynchus stranded in advanced stage of decomposition at Praia da Pedra do Sal, Parnaíba municipality (2°40.8'S, 42°31.2'W), the shape of the head and number of teeth were diagnostic to identify the species (photo PROCEMA files).
Figure 2 from: Costa AF, Siciliano S, Emin-Lima R, Martins BML, Sousa MEM, Giarrizzo T, Silva Júnior JS (2017) Stranding survey as a framework to investigate rare cetacean records of the north and north-eastern Brazilian coasts. ZooKeys 688: 111-134. https://doi.org/10.3897/zookeys.688.12636
Figure 2 - Stranding events: large baleen whales. a Fin whale Balaenoptera physalus stranded at Baía do Japerica, São João de Pirabas municipality (0°45'S, 47°4.2'W), eastern coast of the Pará state. Note the good condition of the carcass and the strange swelling on the top of the head (see white arrow) (photo by GEMAM/MPEG) b A newborn Bryde's whale Balaenoptera brydei stranded on the east coast of Marajó island (0°51.6'S, 48°30'W), Pará on 15 September 2012 (photo by GEMAM/MPEG) c Humpback whale Megaptera novaeangliae stranded at Praia do Rio Novo, Tutóia municipality, Maranhão state (2°42.6'S, 42°26.4'W), note the absence of skull on the carcass (photo by A.F. Costa) d Sei whale Balaenoptera borealis stranded at Fernandes Belo, Viseu municipality (1°10.8'S, 46°5.4'W), the particular coloration of the baleen plates and slightly arched head are diagnostic characters to identify the species (photo by DEMA/PA).
Figure 3 from: Costa AF, Siciliano S, Emin-Lima R, Martins BML, Sousa MEM, Giarrizzo T, Silva Júnior JS (2017) Stranding survey as a framework to investigate rare cetacean records of the north and north-eastern Brazilian coasts. ZooKeys 688: 111-134. https://doi.org/10.3897/zookeys.688.12636
Figure 3 - Stranding events: sperm whales. a Sperm whale Physeter macrocephalus (MPEG 42166) stranded at Praia do Crispim, Marapanim municipality (0°34.8'S, 47°38.4'W) eastern coast of Pará state few hours after death (photo by A.F. Costa) b The same specimen (MPEG 42166) still alive with local people trying to help (internet file) c A newborn Sperm whale (MPEG 42178) stranded at the east coast of Marajó island, Praia do Camburupy (0°32.4'S, 48°28.2'W) on 2014, note the absence of teeth characteristic of a very young specimen (photo by A.F. Costa) d A female Sperm whale (MPEG 42088) stranded at Praia da Pedra do Sal, Parnaíba municipality, Piauí state coastline (2°49.8'S, 41°41.4'W) on 2010 (photo by A.F. Costa).
Figure 1 from: Costa AF, Siciliano S, Emin-Lima R, Martins BML, Sousa MEM, Giarrizzo T, Silva Júnior JS (2017) Stranding survey as a framework to investigate rare cetacean records of the north and north-eastern Brazilian coasts. ZooKeys 688: 111-134. https://doi.org/10.3897/zookeys.688.12636
Figure 1 - Study sites. Surveyed sectors on north and north-eastern Brazilian coast: 1 Marajó Bay 2 Eastern Pará state and 3 Maranhão and Piauí coastlines encompass part of Parnaíba Delta. Black dots representing stranding locations. Physeter macrocephalus (Pma), Balaenoptera brydei (Bbr), Balaenoptera physalus (Bph), Megaptera novaeangliae (Mno), Steno bredanensis (Sbr), Balaenoptera borealis (Bbo), Tursiops truncatus (Ttr), Globicephala macrorhynchus (Gma), Pseudorca crassidens (Pcr), Sotalia guianensis (Sgu), Peponocephala electra (Pel), Stenella attenuata (Sat), Lagenodelphis hosei (Lho), Delphinus sp. (Dsp) and Grampus griseus (Ggr).
Figure 5 in Delphinid brain development from neonate to adulthood with comparisons to other cetaceans and artiodactyls
Figure 5. One example each of a male neonate brain of O. orca compared with a brain of a male adult. The ratio of cerebellum mass to the mass of the whole brain is similar in the neonate and adult. The mass of the neonate brain is 3,292 g, while the adult brain mass is 7,100 g.
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Allen Brain Atlas
Allen Brain Atlas is an Allen Institute collection of brain map atlases, datasets, APIs, and analysis tools covering mouse, human, and non-human primate brain resources.
Annotated Behaviour and Observability Dataset (ABODe)
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DANDI Archive for NWB datasets
DANDI is a BRAIN Initiative archive for publishing and sharing neurophysiology data, including electrophysiology, optophysiology, and behavioral data packaged as NWB and related standards.
International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.