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151 results for “baleen whale”
Morphology of nares associated with stereo-olfaction in baleen whales
<p>The sensory mechanisms used by baleen whales (Mysticeti) for locating ephemeral, dense prey patches in vast marine habitats are poorly understood. Baleen whales have a functional olfactory system with paired rather than single blowholes (nares), potentially enabling stereo-olfaction. Dimethyl sulfide (DMS) is an odorous gas emitted by phytoplankton in response to grazing by zooplankton. Some seabirds use DMS to locate prey, but this ability has not been demonstrated in whales. For all 15 extant species of baleen whale, nares morphometrics (imagery from unoccupied aerial systems, UAS) was related to published trophic level indices using Bayesian phylogenetic mixed modelling. A significant negative relationship was found between nares-width and whale trophic level (β = -0.07, Lower 95% CI = -0.12, Upper 95% CI = -0.02), corresponding with a 36% increase in nares-width from highest to lowest trophic level. Thus, species with nasal morphology best suited to stereo-olfaction are more zooplanktivorous. These findings provide evidence that some baleen whale species may be able to localise odorants e.g., DMS. Our results helps direct future behavioural trials of olfaction in baleen whales, by highlighting the most appropriate species to study. This is a research priority, given the potential for DMS-mediated plastic ingestion by whales.</p>
Figure 5 in Neurovascular evidence for a co-occurrence of teeth and baleen in an Oligocene mysticete and the transition to filter-feeding in baleen whales
Figure 5. Digital segmentations (top) and graphical reconstructions of rostral canals in select cetaceans (bottom). A, extant toothed odontocete Tursiops truncatus (SDSNH 21212). B, extinct toothed mysticete Aetiocetus weltoni (UCMP 122900). C, extant toothless mysticete Eschrichtius robustus (modified from: Ekdale et al., 2015).
Figure 4 in Neurovascular evidence for a co-occurrence of teeth and baleen in an Oligocene mysticete and the transition to filter-feeding in baleen whales
Figure 4. CT-scan data of Aetiocetus weltoni (UCMP 122900). Slice A–A' taken oblique to the horizontal plane through the skull as indicated on the surface medial in lateral view to image course of infraorbital canal. Slices B–B', C–C' and D–D' taken along the transverse plane (original scan axis) at different positions along the rostrum as indicated on the surface model in dorsal view.
Figure 1 in Neurovascular evidence for a co-occurrence of teeth and baleen in an Oligocene mysticete and the transition to filter-feeding in baleen whales
Figure 1. Hypothesis of baleen evolution. Relationships based on published phylogenetic analyses (Uhen, 2013; Fordyce & Marx, 2018; Peredo et al., 2018). Thick bars represent stratigraphic ranges downloaded from the Paleobiology Database (paleobiodb.org) on 14 February 2020, using the taxonomic name search form for each terminal taxon named on the cladogram. Red branches indicate presence of lateral palatal foramina.
Figure 3 in Neurovascular evidence for a co-occurrence of teeth and baleen in an Oligocene mysticete and the transition to filter-feeding in baleen whales
Figure 3. Digital segmentation of neurovascular canals through rostrum of Aetiocetus weltoni (UCMP 122900). A, rostral canals in ventral view. B, rostral canals in lateral view. Abbreviations: dc, dental/alveolar canal; lpc, lateral palatal canal.
Figure 2 in Neurovascular evidence for a co-occurrence of teeth and baleen in an Oligocene mysticete and the transition to filter-feeding in baleen whales
Figure 2. Neurovascular canals through rostrum of Aetiocetus weltoni (UCMP 122900). A, ventral view of 3D rendering of skull (top), skull rendered semi-transparent to reveal internal canals of rostrum (middle), and digital segmentation of rostral canals (bottom). B, lateral view of 3D rendering of skull (top), skull rendered semi-transparent to reveal internal canals of rostrum (middle), and digital segmentation of rostral canals (bottom).
Figure 37 in Herpetocetus morrowi (Cetacea: Mysticeti), a new species of diminutive baleen whale from the Upper Pliocene (Piacenzian) of California, USA, with observations on the evolution and relationships of the Cetotheriidae
Figure 37. Phylogram showing the strict consensus of five most parsimonious trees (348 steps, consistency index = 0.4785, retention index = 0.6533) recovered during analysis. Numerical values to the left of nodes are Bremer support values and bootstrap support values, respectively. Nodes that received a bootstrap score of less than 50% are denoted with '-'.
Figure 28 in Herpetocetus morrowi (Cetacea: Mysticeti), a new species of diminutive baleen whale from the Upper Pliocene (Piacenzian) of California, USA, with observations on the evolution and relationships of the Cetotheriidae
Figure 28. Herpetocetus morrowi sp. nov., UCMP 124950, left holotype dentary. A, dorsal view; B, lateral view; C, ventral view; D, medial view (mirrored horizontally) with transverse cross-sections. Scale bar = 10 cm.
Figure 9 in Herpetocetus morrowi (Cetacea: Mysticeti), a new species of diminutive baleen whale from the Upper Pliocene (Piacenzian) of California, USA, with observations on the evolution and relationships of the Cetotheriidae
Figure 9. Herpetocetus morrowi sp. nov., SDNHM 65781, paratype skull. A, dorsal view; B, ventral view. Scale bar = 10 cm.
Figure 8 in Herpetocetus morrowi (Cetacea: Mysticeti), a new species of diminutive baleen whale from the Upper Pliocene (Piacenzian) of California, USA, with observations on the evolution and relationships of the Cetotheriidae
Figure 8. Herpetocetus morrowi sp. nov., UCMP 124950, holotype skull. A, posterior view; B, illustrated posterior view showing major anatomical features. Scale bar = 10 cm.
Figure 20 in Herpetocetus morrowi (Cetacea: Mysticeti), a new species of diminutive baleen whale from the Upper Pliocene (Piacenzian) of California, USA, with observations on the evolution and relationships of the Cetotheriidae
Figure 20. Herpetocetus morrowi sp. nov., SDNHM 125833, left referred squamosal. A, dorsal view; B, ventral view; C, lateral view. Scale bar = 5 cm.
Figure 7 in Herpetocetus morrowi (Cetacea: Mysticeti), a new species of diminutive baleen whale from the Upper Pliocene (Piacenzian) of California, USA, with observations on the evolution and relationships of the Cetotheriidae
Figure 7. Herpetocetus morrowi sp. nov., UCMP 124950, holotype skull. A, anterodorsal view; B, illustrated anterodorsal view showing major anatomical features.
Figure 5 in Herpetocetus morrowi (Cetacea: Mysticeti), a new species of diminutive baleen whale from the Upper Pliocene (Piacenzian) of California, USA, with observations on the evolution and relationships of the Cetotheriidae
Figure 5. Herpetocetus morrowi sp. nov., UCMP 124950, illustrated holotype skull in ventral view showing anatomical features. LPF, lateral palatal foramen. Scale bar = 10 cm.
Figure 4 in Herpetocetus morrowi (Cetacea: Mysticeti), a new species of diminutive baleen whale from the Upper Pliocene (Piacenzian) of California, USA, with observations on the evolution and relationships of the Cetotheriidae
Figure 4. Herpetocetus morrowi sp. nov., UCMP 124950, holotype skull in ventral view. Scale bar = 10 cm.
Figure 3 in Herpetocetus morrowi (Cetacea: Mysticeti), a new species of diminutive baleen whale from the Upper Pliocene (Piacenzian) of California, USA, with observations on the evolution and relationships of the Cetotheriidae
Figure 3. Herpetocetus morrowi sp. nov., UCMP 124950, illustrated holotype skull in dorsal view showing anatomical features. DMF, dorsal maxillary foramen. Scale bar = 10 cm.
Figure 1 in Herpetocetus morrowi (Cetacea: Mysticeti), a new species of diminutive baleen whale from the Upper Pliocene (Piacenzian) of California, USA, with observations on the evolution and relationships of the Cetotheriidae
Figure 1. Herpetocetus morrowi sp. nov. A, illustrated quarry map of UCMP 124950 as discovered in the field showing the configuration of visible bone elements; B, inferred position of known bone elements of H. morrowi within the body; C, overhead view of the field excavation of UCMP 124950; D, oblique view of the field excavation of UCMP 124950. Numbers in A are those assigned in the field during excavation of the specimen as referred to in the text: 1, lumbar(?) vertebra; 2, lumbar vertebra; 4, lumbar vertebra; 5, lumbar vertebra; 6, thoracic vertebra; 7, vertebral epiphysis; 8, rib; 9, rib.
Figure 2 in Herpetocetus morrowi (Cetacea: Mysticeti), a new species of diminutive baleen whale from the Upper Pliocene (Piacenzian) of California, USA, with observations on the evolution and relationships of the Cetotheriidae
Figure 2. Herpetocetus morrowi sp. nov., UCMP 124950, holotype skull in dorsal view. Scale bar = 10 cm.
Figure 39 in Herpetocetus morrowi (Cetacea: Mysticeti), a new species of diminutive baleen whale from the Upper Pliocene (Piacenzian) of California, USA, with observations on the evolution and relationships of the Cetotheriidae
Figure 39. Herpetocetus morrowi sp. nov., reconstructed skull and mandible based on UCMP 124950, SDNHM 65781, SDNHM 130390, SDNHM 63096, SDNHM 23057, and UCMP 219111. A, lateral view of articulated skull and mandible with mandible adducted; B, lateral view of articulated skull and mandible with mandible abducted and hypothesized musculature configured; C, ventral view of skull showing hypothesized origination points of mandibular musculature. Abbreviation: m, muscle.
Figure 25 in Herpetocetus morrowi (Cetacea: Mysticeti), a new species of diminutive baleen whale from the Upper Pliocene (Piacenzian) of California, USA, with observations on the evolution and relationships of the Cetotheriidae
Figure 25. Herpetocetus morrowi sp. nov., UCMP 124950, right holotype tympanic bulla. A, dorsal view; B, ventral view; C, lateral view; D, medial view; E, anterior view; F, posterior view. Abbreviations: A, anterior; CP, conical process; D, dorsal; EO, Eustachian opening; INV, involucrum; IR, involucral ridge; L, lateral; LF, lateral furrow; M, medial; MF, median furrow; MR, main ridge; P, posterior; SF, sigmoid fissure; SP, sigmoid process; V, ventral. Scale bar = 1 cm.
Figure 22 in Herpetocetus morrowi (Cetacea: Mysticeti), a new species of diminutive baleen whale from the Upper Pliocene (Piacenzian) of California, USA, with observations on the evolution and relationships of the Cetotheriidae
Figure 22. Herpetocetus morrowi sp. nov., SDNHM 63690, left referred petrosal. A, dorsal view; B, ventral view; C, lateral view; D, medial view; E, anterior view; F, posterior view. Abbreviations: A, anterior; D, dorsal; M, medial; P, posterior; V, ventral. Scale bar = 1 cm.
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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)
ABODe is a University of Edinburgh DataShare dataset for behavior classification in group-housed mice using home-cage video, identities, bounding boxes, ground-plate positions, and annotator labels.
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.