Shared and differential traits in the accessory olfactory bulb of caviomorph rodents with particular reference to the semiaquatic capybara

Suárez, Rodrigo, Santibáñez, Rodrigo, Parra, Daniela, Coppi, Antonio A., Abrahão, Luciana M. B., Sasahara, Tais H. C. and Jorge Mpodozis (2011) Shared and differential traits in the accessory olfactory bulb of caviomorph rodents with particular reference to the semiaquatic capybara. Journal of Anatomy, 218 5: 558-565. doi:10.1111/j.1469-7580.2011.01357.x


Author Suárez, Rodrigo
Santibáñez, Rodrigo
Parra, Daniela
Coppi, Antonio A.
Abrahão, Luciana M. B.
Sasahara, Tais H. C.
Jorge Mpodozis
Title Shared and differential traits in the accessory olfactory bulb of caviomorph rodents with particular reference to the semiaquatic capybara
Journal name Journal of Anatomy   Check publisher's open access policy
ISSN 0021-8782
1469-7580
Publication date 2011-05
Sub-type Article (original research)
DOI 10.1111/j.1469-7580.2011.01357.x
Volume 218
Issue 5
Start page 558
End page 565
Total pages 8
Place of publication London, United Kingdom
Publisher Anatomical Society
Language eng
Formatted abstract
The vomeronasal system is crucial for social and sexual communication in mammals. Two populations of vomeronasal sensory neurons, each expressing Gαi2 or Gαo proteins, send projections to glomeruli of the rostral or caudal accessory olfactory bulb, rAOB and cAOB, respectively. In rodents, the Gαi2- and Gαo-expressing vomeronasal pathways have shown differential responses to small/volatile vs. large/non-volatile semiochemicals, respectively. Moreover, early gene expression suggests predominant activation of rAOB and cAOB neurons in sexual vs. aggressive contexts, respectively. We recently described the AOB of Octodon degus, a semiarid-inhabiting diurnal caviomorph. Their AOB has a cell indentation between subdomains and the rAOB is twice the size of the cAOB. Moreover, their AOB receives innervation from the lateral aspect, contrasting with the medial innervation of all other mammals examined to date. Aiming to relate AOB anatomy with lifestyle, we performed a morphometric study on the AOB of the capybara, a semiaquatic caviomorph whose lifestyle differs remarkably from that of O. degus. Capybaras mate in water and scent-mark their surroundings with oily deposits, mostly for male–male communication. We found that, similar to O. degus, the AOB of capybaras shows a lateral innervation of the vomeronasal nerve, a cell indentation between subdomains and heterogeneous subdomains, but in contrast to O. degus the caudal portion is larger than the rostral one. We also observed that four other caviomorph species present a lateral AOB innervation and a cell indentation between AOB subdomains, suggesting that those traits could represent apomorphies of the group. We propose that although some AOB traits may be phylogenetically conserved in caviomorphs, ecological specializations may play an important role in shaping the AOB.
Keyword Chemical communication
Hydrochaeridae
Hystricognathi
Pheromones
Semiochemicals
Vomeronasal system
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: Queensland Brain Institute Publications
 
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Created: Tue, 01 Oct 2013, 17:07:57 EST by Rodrigo Suarez on behalf of Queensland Brain Institute