Repository logo
 
Publication

Hormonal control of swimbladder sonic muscle dimorphism in the Lusitanian toadfish, Halobatrachus didactylus

2003-07-02Journal article Open Access
Simple item page
dc.contributor.authorModesto, Teresa
dc.contributor.authorCanario, Adelino V. M.
dc.date.accessioned2012-04-19T13:13:09Z
dc.date.available2012-04-19T13:13:09Z
dc.date.issued2003-07-02
dc.description.abstractThe swimbladder and associated sonic muscle of the Lusitanian toadfish Halobatrachus didactylus increase in size throughout life and are, respectively, 25% and 30% larger in type I (nest-holder) males than females, which may generate sexual differences in sound production. Sexual dimorphism in swimbladder is also evident in the morphological features of sonic muscle fibers. During the breeding season, type I males have smaller myofibril contracting zones surrounded by larger sarcoplasm areas compared with females, possibly an adaptation to speed and fatigue resistance for the production of long mating calls. Type II (floater) males show characteristics that are intermediate, but statistically not significantly different, between type I males and females. Six weeks after castration and androgen (testosterone and 11- ketotestosterone) replacement in type I and type II males there were no alterations either in swimbladder mass or fiber morphology. However, 17b-estradiol induced a significant decrease in swimbladder mass and sarcoplasm area/myofibril area ratio. Six months after castration there was a clear reduction in the seasonal swimbladder hypertrophy in males and induction of sonic fiber morphological characteristics that resemble those occurring in females (low sarcoplasm area/myofibril area ratio). These results suggest that testicular factors are required to initiate sonic muscle hypertrophy and type I sonic fiber phenotype in H. didactylus, but a specific involvement of androgens has not been completely clarified.por
dc.identifier.otherAUT: ACA00258; TMO00411;
dc.identifier.urihttp://hdl.handle.net/10400.1/1051
dc.language.isoengpor
dc.peerreviewedyespor
dc.publisherThe Company of Biologists Ltdpor
dc.relation.publisherversionhttp://jeb.biologists.org/content/206/19/3467.full.pdfpor
dc.subjectMuscle hypertrophypor
dc.subjectToadfishpor
dc.subjectCastrationpor
dc.subjectAndrogenpor
dc.subjectMale dimorphismpor
dc.titleHormonal control of swimbladder sonic muscle dimorphism in the Lusitanian toadfish, Halobatrachus didactyluspor
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage3477por
oaire.citation.issue206por
oaire.citation.startPage3467por
oaire.citation.titleThe Journal of Experimental Biologypor
person.familyNameModesto
person.familyNameCanario
person.givenNameTeresa
person.givenNameAdelino
person.identifier143624
person.identifier.ciencia-idBD1C-7610-B888
person.identifier.ciencia-id1F1E-D3B3-F804
person.identifier.orcid0000-0002-2691-4906
person.identifier.orcid0000-0002-6244-6468
person.identifier.ridC-7942-2009
person.identifier.scopus-author-id6603372075
person.identifier.scopus-author-id56568523700
rcaap.rightsopenAccesspor
rcaap.typearticlepor
relation.isAuthorOfPublicationfc9019ec-88bd-4fb1-a4b8-dd5eed1fd284
relation.isAuthorOfPublication5f6e51ee-9113-469e-8b9e-f30f2d452521
relation.isAuthorOfPublication.latestForDiscovery5f6e51ee-9113-469e-8b9e-f30f2d452521

Files

Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
Modesto and Canario_2003_The Journal of Experimental Biology.pdf
Size:
125.66 KB
Format:
Adobe Portable Document Format
Download
License bundle
Now showing 1 - 1 of 1
No Thumbnail Available
Name:
license.txt
Size:
1.71 KB
Format:
Item-specific license agreed upon to submission
Description:
Download

Collections

FCT2-Artigos (em revistas ou actas indexadas)