Seasonal Timing of Spermatogenesis and Mating in Squamates: A Reinterpretation

Aldridge, Robert D.; Siegel, Dustin S.; Goldberg, Stephen R.; Pyron, R. Alexander

doi:10.1643/ch-19-230

Cited by 16 publications

(8 citation statements)

References 199 publications

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“…This feature is an evidence of a long-term sperm storage (Loebens et al 2020). Aldridge et al (2020) reported that in snakes, the ductus deferens is the major site for long-term sperm storage. This long-term storage increases reproductive success of males' snakes (Gribbins et al 2005).…”

Section: Discussionmentioning

confidence: 87%

“…The sperm storage has been studied in females (Fox 1956, Schuett 1992, Almeida-Santos & Orsi 2002, Loebens et al 2017, Aldridge et al 2020, however, this reproductive event is also present in males (Almeida- Santos et al 2014). In addition to the sperm storage function, studies have shown a secretory action of the ductus deferens in viperids (Siegel et al 2009).…”

Section: Discussionmentioning

confidence: 99%

“…The SSK is androgen dependent, dependent on elevated plasma androgen levels (Krohmer et al 2004). Aldridge et al (2020) suggested that androgens from the interstitial cells of Leydig were responsible for development of the SSK. The SSK hypertrophy is related to the copulation period (Aldridge et al 2009).…”

Section: Discussionmentioning

confidence: 99%

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Seasonal variations of male reproductive parameters of Tomodon dorsatus from Southeastern Brazil

Abud

Schimming

2021

Pesq. Vet. Bras.

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The morphology of the male reproductive tract of Tomodon dorsatus was described in the austral seasons of the year considering macroscopic and microscopic variables. For this purpose, 56 specimens from the herpetological collection of the “Instituto Butantan” were used. Fragments of the testes, kidneys and ductus deferens were collected and submitted to histological routine. The peak of the testicular volume was observed in the summer and the epithelium of the seminiferous tubules had higher height in the summer (p=0.001). The testes were active throughout the year, however, the spermiogenesis peaked in the summer. There were spermatozoa in the lumen of the ductus deferens in all seasons of the year. Renal length was higher in autumn (p=0.027), and renal width did not show a significant increase (p=0.237). The diameter and epithelial height of the sexual segment of the kidney (SSK) showed hypertrophy in winter and spring, coinciding with the mating period. Based on findings of this study, we can suggest that, at the population level, the reproductive cycle of T. dorsatus can be considered seasonal semi-synchronous, due to the peak of spermiogenic activity in the hot season, and discontinuous at the individual level.

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Section: Discussionmentioning

confidence: 87%

Section: Discussionmentioning

confidence: 99%

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Seasonal variations of male reproductive parameters of Tomodon dorsatus from Southeastern Brazil

Abud

Schimming

2021

Pesq. Vet. Bras.

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“…Rainfall might also influence the reproductive activities of snakes through its effect on the vegetation where snakes' prey live. Undoubtedly, Prey provide snakes with energy required for reproductive activities such as the production of sperms (Shiravi et al, 2012;Aldridge et al, 2020). The reproductive cycles of snakes in many parts of the world, especially tropical regions, are closely correlated with the rainy season and the availability of prey (Henderson and Hoevers, 1977;Pizzatto and Marques, 2006;Shine and Brown, 2008;Barros et al, 2014;García-Cobos et al, 2020).…”

Section: Discussionmentioning

confidence: 99%

The reproductive cycle of the flowered racer (Platyceps florulentus) from a rural area to the east of the Nile Delta, Egypt.

al.¹

2022

Egypt. J. of Aquatic Biolo. and Fish.

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“…One potential option is the need for extended sperm storage in some species of snakes. While most lizards and many snakes have associated reproductive cycles, some snakes have dissociated reproductive cycles where spermatogenesis and fertilization are separated by several months [67,68]. The need for sperm to survive for extended periods in either the female or male reproductive tract could result in selection for sperm with higher energy stores.…”

Section: Evolution Of Sperm Morphologymentioning

confidence: 99%

Sperm competition in squamate reptiles

Friesen

Kahrl

Olsson

2020

Phil. Trans. R. Soc. B

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Multiple paternity is ubiquitous within the polyphyletic group called ‘reptiles', especially within the lizards and snakes. Therefore, the probability of sperm competition occurring, and being intense, is high. Squamates exhibit a diversity of tactics to ensure fertilization success in the face of sperm competition. The duration of female sperm storage, which can be many months and even years in some species, remains an enigma. Here, we emphasize some mechanisms that might affect patterns of paternity, the source and function of ejaculates and features of the female reproductive tract that may aid in long-term sperm storage. In doing so, we present a new analysis of the relationship between sperm size, the strength of sperm competition and the duration of female sperm storage. Lizards and snakes are a diverse group that has provided many excellent models for the study of an array of life-history strategies. However, when it comes to postcopulatory sexual selection, there is much left to discover. This article is part of the theme issue ‘Fifty years of sperm competition'.

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Seasonal Timing of Spermatogenesis and Mating in Squamates: A Reinterpretation

Cited by 16 publications

References 199 publications

Seasonal variations of male reproductive parameters of Tomodon dorsatus from Southeastern Brazil

Seasonal variations of male reproductive parameters of Tomodon dorsatus from Southeastern Brazil

The reproductive cycle of the flowered racer (Platyceps florulentus) from a rural area to the east of the Nile Delta, Egypt.

Sperm competition in squamate reptiles

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