scholarly journals Author Correction: Morphological changes of telocytes in camel efferent ductules in response to seasonal variations during the reproductive cycle

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Fatma M. Abdel-Maksoud ◽  
Hanan H. Abd-Elhafeez ◽  
Soha A. Soliman
Keyword(s):  
Reproductive Cycle ◽  
Seasonal Variations ◽  
Morphological Changes ◽  
Efferent Ductules

scholarly journals Localization of Receptors for Sex Steroids and Pituitary Hormones in the Female Genital Duct throughout the Reproductive Cycle of a Viviparous Gymnophiona Amphibian, Typhlonectes compressicauda

Animals ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 2
Author(s):  
Claire Brun ◽  
Jean-Marie Exbrayat ◽  
Michel Raquet
Keyword(s):  
Reproductive Cycle ◽  
Sex Steroids ◽  
Morphological Changes ◽  
Progesterone Receptors ◽  
Pituitary Hormones ◽  
Prolactin Receptors ◽  
Functional Regulation ◽  
Specific Receptors ◽  
Immunohistochemical Methods ◽  
Female Genital

Reproduction in vertebrates is controlled by the hypothalamo-pituitary-gonadal axis, and both the sex steroid and pituitary hormones play a pivotal role in the regulation of the physiology of the oviduct and events occurring within the oviduct. Their hormonal actions are mediated through interaction with specific receptors. Our aim was to locate α and β estrogen receptors, progesterone receptors, gonadotropin and prolactin receptors in the tissues of the oviduct of Typhlonectes compressicauda (Amphibia, Gymnophiona), in order to study the correlation between the morphological changes of the genital tract and the ovarian cycle. Immunohistochemical methods were used. We observed that sex steroids and pituitary hormones were involved in the morpho-functional regulation of oviduct, and that their cellular detection was dependent on the period of the reproductive cycle.

The reproductive cycle of the endangered cyprinidAlburnus albidus: Morphological changes of the gonads and plasma sex steroid fluctuations

1998 ◽  
Vol 65 (sup1) ◽  
pp. 223-226 ◽  
Author(s):  
Giulia Guerriero ◽  
Marina Paolucci ◽  
Pier Giorgio Bianco ◽  
Virgilio Botte ◽  
Gaetano Ciarcia
Keyword(s):  
Reproductive Cycle ◽  
Morphological Changes ◽  
Sex Steroid

scholarly journals Dynamic of decapod crustacean larvae on the entrance of Guanabara bay

2002 ◽  
Vol 45 (4) ◽  
pp. 491-498 ◽  
Author(s):  
Lohengrin Dias de Almeida Fernandes ◽  
Sérgio Luiz Costa Bonecker ◽  
Jean Louis Valentin
Keyword(s):  
Reproductive Cycle ◽  
Seasonal Variations ◽  
Coastal Waters ◽  
Decapod Crustacean ◽  
Late Summer ◽  
Late Winter ◽  
Guanabara Bay ◽  
Tidal Cycles ◽  
Decapod Larvae

In the present study, we observed seasonal variations in the density of decapod larvae as well as changes in density related to diurnal and tidal cycles. Among the decapod larvae collected, portunids and grapsids were the most abundant, especially during nocturnal ebb tides and near the surface. The same results were obtained in late winter (September) and late summer (March). These results demonstrated a flow of decapod larvae from Guanabara Bay to adjacent coastal waters. Luciferid (Lucifer faxoni) was the only group with high densities during flood tides and we suggest this is an evidence of L. faxoni larvae entering Guanabara Bay in late winter. Probably these changes in distribution of Lucifer faxoni among winter and summer were related to reproductive cycle in the bay. For the portunids, grapsids and ocypodids, a similar dispersion strategy was observed towards adjacent coastal waters in the surface during nocturnal ebb tides.

scholarly journals Reproductive cycle of the Neotropical cichlid yellow peacock bass Cichla kelberi: A novel pattern of testicular development

2013 ◽  
Vol 11 (3) ◽  
pp. 587-596 ◽  
Author(s):  
Diógenes Henrique de Siqueira-Silva ◽  
Carlos Alberto Vicentini ◽  
Alexandre Ninhaus-Silveira ◽  
Rosicleire Veríssimo-Silveira
Keyword(s):  
Reproductive Cycle ◽  
Germ Cells ◽  
Light Microscope ◽  
Morphological Changes ◽  
Germinal Epithelium ◽  
Testicular Development ◽  
Preparatory Phase ◽  
Testicular Morphology ◽  
Peacock Bass ◽  
Spermatogonial Proliferation

The present study describes the testicular maturation phases (associating the germ cells development and the morphological changes suffered by the germinal epithelium along the whole year), and the testicular morphology in the yellow peacock bass Cichla kelberi, relating it to other species. For this purpose, 78 specimens were studied according conventional techniques of light microscope. The testes in C. kelberi were classified as unrestricted spermatogonial lobular, an apomorphic characteristic in the recent groups of Teleost. Furthermore, were defined five testicular maturation phases: Preparatory phase; Early Germinal Epithelium Development; Mid Germinal Epithelium Development; Late Germinal Epithelium Development and; Regression. Similar classifications were described to other species indicating that the testicular classifications based on this propose, can be applied to lots of fishes. However, besides it similarity, the testicular reproductive cycle of C. kelberifollows a different pattern in the Regression phase, on which the gonadal restructuration and the spermatogonial proliferation gathers at the same time. So, the testes in C. kelberi never return to the Preparatory phase to start a new reproductive cycle, being this one present only at the first reproductive cycle in this species. This fact also explains the absence of individuals totally spent after their first reproductive cycle.

Testicular morphological changes during the seasonal reproductive cycle in the bullfrogRana catesbeiana

2004 ◽  
Vol 301A (3) ◽  
pp. 249-260 ◽  
Author(s):  
Estela Sasso-Cerri ◽  
Flávio P. De Faria ◽  
Edna Freymüller ◽  
Sandra M. Miraglia
Keyword(s):  
Reproductive Cycle ◽  
Morphological Changes

Seasonal variations in the biochemical composition and reproductive cycle of the ghost crabOcypode quadrata(Fabricius, 1787) in Southern Brazil

2010 ◽  
Vol 9999A ◽  
pp. n/a-n/a ◽  
Author(s):  
Graziani de Freitas Antunes ◽  
Ana Paula Nunes do Amaral ◽  
Fabiana Pinto Ribarcki ◽  
Elenir de Fátima Wiilland ◽  
Denise Maria Zancan ◽  
...  
Keyword(s):  
Reproductive Cycle ◽  
Seasonal Variations ◽  
Biochemical Composition ◽  
Southern Brazil

scholarly journals Morphological changes of Sertoli cells during the male reproductive cycle of the teleost Piaractus mesopotamicus (Holmberg, 1887)

2005 ◽  
Vol 65 (2) ◽  
pp. 241-249 ◽  
Author(s):  
C. Cruz-Landim ◽  
F. C. Abdalla ◽  
M. A. Cruz-Höfling
Keyword(s):  
Germ Cell ◽  
Sertoli Cell ◽  
Reproductive Cycle ◽  
Sertoli Cells ◽  
Morphological Changes ◽  
Cell Development ◽  
Cell Maturation ◽  
Ultrastructural Changes ◽  
Piaractus Mesopotamicus

An investigation of the histological and ultrastructural changes of Sertoli cells during the male reproductive cycle in Piaractus mesopotamicus was made. The results showed that the Sertoli cell development is closely related with germ cell maturation. Therefore, these cells may have some role in germ cell maturation during the reproductive cycle of this species, whether in forming a tissue framework for the developing spermatogenic cysts, aiding in testes reorganization for a new reproductive cycle, in addition to other possible functions discussed in the text.

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