Seasonal gonadal changes in adult male lizards of Liolaemus cuyanus (Iguania: Liolaemidae) from the Monte desert, Argentina

Barauna, Andrea Anabella; Quiroga, Lorena B.; Monclús, María Ángeles; Sanabria, Eduardo Alfredo; Fornés, Miguel Walter

doi:10.1016/j.therwi.2023.100019

Cited by 1 publication

(4 citation statements)

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“…Adult males of the lizard L. cuyanus were caught ( N = 27) during two consecutive active seasons (October 2017 to March 2018/November 2018 to March 2019), using a loop of dental floss with a slip knot made attached to a fishing rod (Sillero & García‐Muñoz, 2010), as detailed in Barauna et al (2023). Additionally, juvenile males were also caught ( N = 10) for a comparison of the plasma testosterone concentration as a biological validation (see below, Section 2.5).…”

Section: Methodsmentioning

confidence: 99%

“…In a later instance, all the animals captured during their activity period in different months were classified according to reproductive criteria in three relevant periods: pre‐reproductive in October (PrR; N = 2), reproductive from November to January (R; N = 18), and post‐reproductive since February to March (PsR; N = 7), as stated in Barauna et al (2023).…”

Section: Methodsmentioning

confidence: 99%

“…Data published in a previous paper (Barauna et al, 2023) on the ratio of total Leydig cells/active Leydig cells (TLC/ALC) were used in this study to correlate with plasma testosterone concentration. Leydig cells with regularly shaped nuclei, dispersed chromatin, and vacuolated cytoplasm were considered active, under LM.…”

Section: Total Leydig Cells Versus Active Leydig Cellsmentioning

confidence: 99%

“…The study population is located in Valle de Matagusanos, Ullúm, San Juan, Argentina. Recently, it was demonstrated that adult males of this population exhibit a seasonal cycle with reproductive activity beginning in spring, persisting in summer, and ending in late summer (Barauna et al, 2023).…”

Section: Introductionmentioning

confidence: 99%

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Testosterone is closely related to Leydig cell activity, environmental factors, and androgen receptor distribution in adult male lizards of Liolaemus cuyanus (Reptilia: Liolaemidae) during the reproductive cycle

Barauna,

Conte,

Leporati

et al. 2024

J Exp Zool Pt A

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Testosterone, the primary sex hormone in male lizards, is closely linked to Leydig cell activity (the cells where steroidogenesis occurs) throughout the reproductive cycle, but testosterone action is related to androgen receptors (ARs) distribution in the seminiferous epithelium. In temperate zones, environmental factors detected through the hypothalamic–pituitary–gonadal axis, downregulate plasma testosterone, resulting in a seasonal reproductive cycle. The aim of this work is to study plasma testosterone in adult male lizards of Liolaemus cuyanus, an oviparous species, throughout its reproductive cycle and its relationship with Leydig cell histology, TotalLeydigCell/ActiveLeydigCell (TLC/ALC) ratio, environmental factors (temperature, relative humidity and solar irradiation) and ARs distribution in seminiferous epithelium. Specimens (N = 27) were captured (October to March) in a semi‐arid zone (Valle de Matagusanos, San Juan, Argentina) and grouped into three relevant reproductive periods: pre‐reproductive (PrR), reproductive (R), and post‐reproductive (PsR). Significant differences in plasma testosterone were found among these periods, highest during R than in PsR. A significant positive correlation between plasma testosterone and TLC/ALC ratio was also observed. Plasma testosterone has a significant positive correlation only with solar irradiation, but not with the other variables. In PrR and R, ARs distribution was cytoplasmic and nuclear, shifting to only cytoplasmic in PsR. These results highlight the close correspondence between plasma testosterone, Leydig cell histology and activity, environmental factors, and ARs distribution, resulting in a synchronization that allows males of L. cuyanus to coordinate their reproductive cycle with the most favorable environmental conditions, probably for mating and birth of offspring.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Total Leydig Cells Versus Active Leydig Cellsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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