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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Ultrastructural Characteristics of the Spermatogenesis During the Four Phases of the Annual Reproductive Cycle of the Black Myotis Bat, Myotis nigricans (Chiroptera: Vespertilionidae)

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Beguelini, Mateus R. [1] ; Taboga, Sebastiao R. [1] ; Morielle-Versute, Eliana [2]
Total Authors: 3
[1] UNESP Univ Estadual Paulista, Dept Biol, BR-15054000 Sao Paulo - Brazil
[2] UNESP Univ Estadual Paulista, Dept Bot & Zool, BR-15054000 Sao Paulo - Brazil
Total Affiliations: 2
Document type: Journal article
Source: MICROSCOPY RESEARCH AND TECHNIQUE; v. 76, n. 10, p. 1035-1049, OCT 2013.
Web of Science Citations: 13

Myotis nigricans is an endemic species of vespertilionid bat, from the Neotropical region, that resembles temperate zone bats in their reproductive cycle; presenting an annual reproductive cycle with two periods of testicular regression, which are not linked to the apoptotic process and seems to be not directly linked to any seasonal abiotic variation. Thus, this study aimed to ultrastructurally evaluate their reproductive cycle. The process of testicular regression could be divided into four periods: active; regressing; regressed and recrudescence; with all presenting distinct characteristics. The active period was similar to that of other bats, presenting the complete occurrence of spermatogenesis, with three main types of spermatogonia (A(d), A(p), and B) and 12 steps in spermatid differentiation; however, it differed in having the outer dense fibers 1, 5, 6, and 9 larger than the others. These three types of spermatogonia undergo considerable morphologic changes from regressing to the regressed period, and in the recrudescence, they return to the basic morphology, which reactivates spermatogenesis. In conclusion, our study described the process of spermatogenesis, the ultrastructure of the spermatozoa and the distinct morphologic variations in the ultrastructure of the testicular cells of M. nigricans during the four different periods of its annual reproductive cycle. Microsc. Res. Tech., 76:1035-1049, 2013. (c) 2013 Wiley Periodicals, Inc. (AU)

FAPESP's process: 09/03470-2 - Morphophysiology of the BAT prostate: Compative evaluation in the Phyllostomidae, Mollosidae and Vespertilionidae families
Grantee:Sebastião Roberto Taboga
Support type: Regular Research Grants
FAPESP's process: 09/16181-9 - Ultra-structural and immunocytochemical analysis of spermatogenesis and nucleologenesis of bats
Grantee:Eliana Morielle Versute
Support type: Regular Research Grants