Testicular histomorphometric patterns and spermatogenesis dynamics of Oecomys bicolor tomes, 1860 (Rodentia: Cricetidae)

Although the order Rodentia does not present a high risk of extinction compared to mammals as a whole, several families demonstrate high levels of threat and/or data deficiency, therefore highlighting the need for targeted research and the application of ecological and reproductive data to the devel...

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Published in:Anatomia, histologia, embryologia Vol. 53; no. 4; pp. e13062 - n/a
Main Authors: Martins, Ana Luiza Pereira, Dias, Fernanda Carolina Ribeiro, Oliveira, Elizabeth Lopes, Rodrigues, Grasielle Avelar Vieira, Avelar, Gleide Fernandes, Melo, Fabiana Cristina Silveira Alves, Costa, Kyvia Lugate Cardoso, Matta, Sérgio Luis Pinto
Format: Journal Article
Language:English
Published: Germany Wiley Subscription Services, Inc 01.07.2024
Subjects:
Animals
Arvicolinae - anatomy & histology
Arvicolinae - physiology
biometry
Body weight
Brazil
Cricetidae
Deciduous forests
Epithelium
extinction
family
Leydig
Leydig cells
Leydig Cells - cytology
Leydig Cells - physiology
Male
Meiosis
mitosis
Oecomys bicolor
Parenchyma
Reproductive behavior
risk
Rodentia
seminiferous epithelium
seminiferous tubule
Seminiferous Tubules - anatomy & histology
Sertoli
species
Species extinction
Spermatogenesis
Spermatogenesis - physiology
Testis - anatomy & histology
Testis - physiology
Tropical forests
Tubules
Brazil
Oecomys bicolor
spermatogenesis
Leydig
seminiferous tubule
Sertoli
ISSN:0340-2096, 1439-0264, 1439-0264
Online Access:Get full text
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Summary:Although the order Rodentia does not present a high risk of extinction compared to mammals as a whole, several families demonstrate high levels of threat and/or data deficiency, therefore highlighting the need for targeted research and the application of ecological and reproductive data to the development of conservation actions. The order Rodentia, the largest among mammals, includes 9 families, and the family Cricetidae is the most diverse of the Brazilian rodents. In Brazil, 12 of the 16 genera of Oecomys are found. Oecomys bicolor is known in Brazil as the ‘arboreal rat’ and is, found in dry, deciduous and tropical forests. The mean body weight of Oecomys bicolor was 35.8 g and the gonadal, tubular and epithelial somatic indexes were, 0.53%, 0.47% and 0.37%, respectively. Seminiferous tubules volume density was 89.72% and the mitotic and meiotic indexes corresponded to 8.59 and 2.45 cells, respectively, and the yield of spermatogenesis was 23.83 cells. The intertubular compartment represented 10.28% of the testis parenchyma and around 5% of the interstitial space was occupied by Leydig cells, whose number per gram of testis was 11.10 × 107 cells. By evaluating the biometric and histomorphometric characteristics of the testis, there is evidence that this species has a high investment in reproduction. Due to the high contribution of the seminiferous epithelium and the intertubular compartment in this species, compared to the others of the same family, it is possible to infer that the species Oecomys bicolor has a promiscuous reproductive behaviour.
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ISSN:0340-2096
1439-0264
1439-0264
DOI:10.1111/ahe.13062