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2012 | 57 | 2 |
Tytuł artykułu

Patterns of variation in the tympanic bulla of tuco-tucos (Rodentia, Ctenomyidae, Ctenomys)

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Warianty tytułu
Języki publikacji
EN
Abstrakty
EN
As subterranean rodents live in burrows and are constrained by the physics of their environment to vocalize, mainly in low frequencies, their expanded middle ear cavities are associated with enhanced lower-frequency hearing. Previous literature has widely acknowledged inflated tympanic bulla as a character to be found in the majority of the Ctenomys species. To explore the morphology of Ctenomys tympanic bulla, we studied a sample of 669 skulls, obtained from 21 species, for tympanic bulla size, volume, and internal structure. The study determined that bullar inflation does not seem to be the rule in Ctenomys and that the relationship between bullar size (volume) and skull size do not correspond to the phylogeny based on cytochrome b sequences thus probably being a species-specific adaptive characteristic. We also found that the internal bullar structure differs between taxa, depending on the relative contributions of cancellous (alveolar) and septate patterns to the partitioning of the bulla.
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-
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Rocznik
Tom
57
Numer
2
Opis fizyczny
p.153-163,fig.,ref.
Twórcy
  • Seccion Etologia, Facultad de Ciencias, Universidad de la Republica Oriental del Uruguay, Igua 4225, Montevideo 11400, Uruguay
autor
  • Departamento de Ciencias Ecologicas, Facultad de Ciencias, Universidad de Chile, Casilla 653, Nunoa, Santiago, Chile
autor
  • Departamento de Ecologia, Pontificia Universidad Catolica de Chile, Avda. Libertador Bernardo O'Higgins 340, Casilla 114-D, Santiago C.P. 6513677, Chile
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