Cetaceans
Mostrando 25-36 de 38 artigos, teses e dissertações.
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25. Zooarqueologia dos mamíferos aquáticos e semi-aquáticos da Ilha de Santa Catarina, sul do Brasil
This study analyzes the use of aquatic mammals by prehistoric societies of Santa Catarina Island, Southern Brazil. Samples from two archaeological sites were examined: Rio do Meio (RM) and Porto do Rio Vermelho (SCPRV). Nine aquatic mammal species were found: a) pinnipeds: Arctocephalus australis (Zimmerman, 1783) and A. tropicalis (Gray, 1872), and b) cetac
Revista Brasileira de Zoologia. Publicado em: 2001-09
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26. EST. SOBRE CETACEOS ODONTOCETES ENC. EM PRAIAS DA REGENTRE IGUAPE (SP) E A BAIA DE PARANAGUA (PR) (24 42S-25 28S) COM ESP. REF. A SOTALIA FLUVIATILIS (GERV.1853 / Study about odontocete cetaceans founded in beaches between Iguape (SP) and Baía de Paranaguá (PR) (24 graus´42´S - 25´S graus´28´S) with sécial reference of sotalia fluviatilis (Gervais, 1953) (Delphinidae).
The occurrence, morphometric and craniometric data and stomach contents of odontoceti cetaceans found in the south coast of São Paulo State and north coast of Paraná State (Ilha Comprida, Marujá and Deserta beaches) from April, 1986 to April, 1988 were analysed in this study. For the most abundant species we estimated the individual age by reading growth
Publicado em: 1990
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27. Phylogenetic relationships among cetartiodactyls based on insertions of short and long interpersed elements: Hippopotamuses are the closest extant relatives of whales
Insertion analysis of short and long interspersed elements is a powerful method for phylogenetic inference. In a previous study of short interspersed element data, it was found that cetaceans, hippopotamuses, and ruminants form a monophyletic group. To further resolve the relationships among these taxa, we now have isolated and characterized 10 additional lo
The National Academy of Sciences.
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28. Observations on endocranial casts of recent and fossil cetaceans
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29. Helicobacter cetorum sp. nov., a Urease-Positive Helicobacter Species Isolated from Dolphins and Whales
A novel helicobacter with the proposed name Helicobacter cetorum, sp. nov. (type strain MIT 99-5656; GenBank accession number AF 292378), was cultured from the main stomach of two wild, stranded Atlantic white-sided dolphins (Lagenorhynchus acutus) and from the feces of three captive cetaceans (a Pacific white-sided dolphin [Lagenorhynchus obliquidens]; an A
American Society for Microbiology.
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30. Evolution of river dolphins.
The world's river dolphins (Inia, Pontoporia, Lipotes and Platanista) are among the least known and most endangered of all cetaceans. The four extant genera inhabit geographically disjunct river systems and exhibit highly modified morphologies, leading many cetologists to regard river dolphins as an unnatural group. Numerous arrangements have been proposed f
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31. Effects of Character Weighting and Species Sampling on Phylogeny Reconstruction: A Case Study Based on DNA Sequence Data in Cetaceans
Different phylogenetic analyses of the same genetic data set can yield conflicting results, depending on the choic of parameter settings and included taxa. This is particularly true in studies involving data sets where levels of homoplasy are high and likely to obscure the phylogenetic signal. Filtering of this phylogenetic noise can be attempted, with varyi
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32. The beluga whale produces two pulses to form its sonar signal
Odontocete cetaceans use biosonar clicks to acoustically probe their aquatic environment with an aptitude unmatched by man-made sonar. A cornerstone of this ability is their use of short, broadband pulses produced in the region of the upper nasal passages. Here we provide empirical evidence that a beluga whale (Delphinapterus leucas) uses two signal generato
The Royal Society.
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33. A new Eocene archaeocete (Mammalia, Cetacea) from India and the time of origin of whales
Himalayacetus subathuensis is a new pakicetid archaeocete from the Subathu Formation of northern India. The type dentary has a small mandibular canal indicating a lack of auditory specializations seen in more advanced cetaceans, and it has Pakicetus-like molar teeth suggesting that it fed on fish. Himalayacetus is significant because it is the oldest archaeo
The National Academy of Sciences.
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34. Live birth in Cretaceous marine lizards (mosasauroids).
Although live-bearing (viviparity) has evolved around 100 times within reptiles, evidence of it is almost never preserved in the fossil record. Here, we report viviparity in mosasauroids, a group of Cretaceous marine lizards. This is the only known fossil record of live-bearing in squamates (lizards and snakes), and might represent the oldest occurrence of t
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35. Auditory brainstem response in dolphins.
We recorded the auditory brainstem response (ABR) in four dolphins (Tursiops truncatus and Delphinus delphis). The ABR evoked by clicks consists of seven waves within 10 msec; two waves often contain dual peaks. The main waves can be identified with those of humans and laboratory mammals; in spite of a much longer path, the latencies of the peaks are almost
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36. The Origin of Human Chromosome 1 and Its Homologs in Placental Mammals
Developing ordered gene maps from multiple mammalian species coupled with chromosome-painting data provide a powerful resource for resolving the evolutionary history of chromosomes and whole genomes. In this work, we recapitulate the evolutionary history of human chromosome 1 and its homologs in placental mammals, putatively the largest physical unit in
Cold Spring Harbor Laboratory Press.