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10 results for “Grebe”
Figure 5 in Morphological evidence for sister group relationship between flamingos (Aves: Phoenicopteridae) and grebes (Podicipedidae)
Figure 5. Hypotarsus in comparison. (A) Phoenicopterus chilensis (Phoenicopteridae); (B) Palaelodus sp. (Palaelodidae, SMF Av182c); (C) Aechmophorus occidentalis (Podicipedidae). Not to scale. The numerals indicate the furrows/canals for the tendons of: 1, musculus flexor digitorum longus; 2, musculus flexor perforatus digiti II; 3, musculus flexor perforans et perforatus digiti II; 4, musculus flexor hallucis longus. Homology of tendineal furrows/canals was verified against spirit specimens for Phoenicopteridae (J. Bosch, pers. comm.) and deduced from position of bony canals for the other taxa. Note that identification of tendineal furrows/canals departs from Strauch (1978: fig. 29). Not to scale.
Figure 3 in Morphological evidence for sister group relationship between flamingos (Aves: Phoenicopteridae) and grebes (Podicipedidae)
Figure 3. Right tibiotarsus, proximal end in comparison. (A) Podiceps cristatus (Podicipedidae); (B) Phoenicopterus ruber (Phoenicopteridae); (C) Ciconia ciconia (Ciconiidae). The arrows indicate the cnemial crest (character 55). Not to scale.
Figure 2 in Morphological evidence for sister group relationship between flamingos (Aves: Phoenicopteridae) and grebes (Podicipedidae)
Figure 2. Proximal end of right humerus (A–D) and proximal phalanx of major digit (E–I) in comparison. (A) Phoenicopterus chilensis (Phoenicopteridae); (B) Palaelodus sp. (Palaelodidae, SMF Av 191a); (C) Tachybaptus ruficollis (Podicipedidae); (D) Eudocimus ruber (Threskiornithidae); (E) Juncitarsus merkeli (cast of holotype in SMF, coated with ammonium chloride); (F) Phoenicopterus ruber (Phoenicopteridae); (G) Palaelodus sp. (Palaelodidae, SMF Av 274g); (H) Aechmophorus occidentalis (Podicipedidae); (I) Eudocimus ruber (Threskiornithidae). The arrows indicate the marked depression at the attachment site of musculus scapulohumeralis cranialis (character 41). Not to scale.
Figure 4 in Morphological evidence for sister group relationship between flamingos (Aves: Phoenicopteridae) and grebes (Podicipedidae)
Figure 4. Right foot in comparison. (A) Juncitarsus merkeli (cast of holotype in SMF, coated with ammonium chloride); (B) Podiceps cristatus (Podicipedidae); (C) Phoenicopterus ruber (Phoenicopteridae, figure reversed to facilitate comparison). The arrows point to the hallux (character 59); note the comparatively well-developed hindtoe in Juncitarsus. Not to scale.
Estimating the global population size and highlighting conservation priority areas for the endangered Titicaca grebe
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Data from: Rapid mobilization of abdominal fat in migrating eared grebes
Eared grebes Podiceps nigricollis, like shorebirds and other long-distance migrants, lay down large amounts of fat to power their journeys. To investigate the pattern of how fat and soft tissue might be mobilized, we used grebes killed in migration and applied computed tomography to reconstruct how stores in the chest, thorax, and abdomen were reduced as body weight decreased. Fat and soft tissue were each mobilized at a constant rate through the entire migration. Fat stores in birds embarking on migration were greater in the abdomen than thorax than chest. In contrast to previous studies indicating that abdominal fat was mobilized first, we found that fat from all areas was mobilized concurrently, but that abdominal fat was catabolized at a greater rate. We suggest why this pattern might be advantageous, consider whether inter-depot differences in fat composition might be involved, and note possible energetic consequences. Whether our findings pertain to other obese or long distance migrants remains to be determined.
Data from: Rapid mobilization of abdominal fat in migrating eared grebes
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Data from: Fossil grebes from the Truckee Formation (Miocene) of Nevada and a new phylogenetic analysis of Podicipediformes (Aves)
Podicipediformes is a cosmopolitan clade of foot-propelled diving birds that, despite inhabiting marine and lacustrine environments, have a poor fossil record. In this contribution, we describe three new grebe fossils from the diatomite beds of the Late Miocene Truckee Formation (10.2 ± 0.2 Ma) of Nevada (USA). Two postcranial skeletons and an associated set of wing elements indicate that at least two distinct grebe species occupied the large, shallow Lake Truckee during the Miocene. Phylogenetic analysis of morphological data supports a basal divergence between a clade uniting the dabchicks (Tachybaptus, Limnodytes, Poliocephalus) and a clade uniting Podilymbus, Rollandia, Podiceps and Aechmophorus. Missing data, combined with a paucity of informative skeletal characters, make it difficult to place the Truckee grebes within either of these major clades. Given the weak projection of the cnemial crests compared with extant grebes, it also remains plausible that these specimens represent stem lineage grebes. Although more material is needed to resolve the phylogenetic position of the Truckee grebes, our analysis offers insight into the tempo of grebe evolution by placing the Miocene taxon Thiornis sociata within the dabchick clade. Thiornis sociata provides a minimum age calibration of 8.7 Ma for the basal divergence among dabchicks. Based on the recovery of a nonmonophyletic Tachybaptus and placement of the Western Hemisphere 'Tachybaptus' dominicus as the basal member of the otherwise exclusively Eastern Hemisphere dabchick clade, we resurrect the genus Limnodytes for this extant species (Limnodytes dominicus). Our results also nest the large, long-necked Aechmophorus grebes within the genus Podiceps, as the sister taxon to Podiceps major.
Figure 1 in Morphological evidence for sister group relationship between flamingos (Aves: Phoenicopteridae) and grebes (Podicipedidae)
Figure 1. Strict consensus tree of three most parsimonious trees resulting from a cladistic analysis of the character matrix in Appendix 2 (Length = 197, CI = 0.39, RI = 0.56, RC = 0.21). Bootstrap values of more than 50% are indicated above the internodes.
Data from: Fossil grebes from the Truckee Formation (Miocene) of Nevada and a new phylogenetic analysis of Podicipediformes (Aves)
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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.