Development of a sperm cryopreservation protocol for the Argentine black and white tegu (Tupinambis merianae)

Theriogenology, Journal Year: 2016, Volume and Issue: 87, P. 55 - 63

Published: Aug. 22, 2016

Language: Английский

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Electrostimulation is an effective and safe method for semen collection in medium-sized lizards

Theriogenology, Journal Year: 2018, Volume and Issue: 118, P. 40 - 45

Published: June 1, 2018

Language: Английский

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Kinematic and head morphometric characterisation of spermatozoa from the Brown Caiman (Caiman crocodilus fuscus)

Animal Reproduction Science, Journal Year: 2019, Volume and Issue: 207, P. 9 - 20

Published: June 12, 2019

Language: Английский

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Importance of reproductive biology of a harvest lizard, Tupinambis merianae, for the management of commercial harvesting

Wildlife Research, Journal Year: 2015, Volume and Issue: 42(8), P. 697 - 697

Published: Jan. 1, 2015

Context Management of the exploitation resources requires biological information on exploited species. The skins large reptiles have a commercial value as luxury leather items and Tupinambis lizards from southern South America historically been for this purpose. Argentina implemented management plans since 1988 that established minimum capture size based width dried skins, but prescription has not linked to local reproductive attributes Aim In study, we aim determine parameters merianae evaluate which class sizes individuals are susceptible trade in central generate species-specific improve available tools. Methods We determined relationship between live body sizes. identified at sexual maturity males females. Moreover, status by characterised gonadal development seasonal events Argentina. evaluated female clutch size. Key results Reproduction T. is markedly seasonal, with both sexes concentrating their activities October December. Size was smaller than females, percentage females lower males. sexes, frequency low lizards, bigger had positively related Conclusions maturity, period, should be taken into account when designed minimise any negative impacts harvesting. Implications Argentina, breeding season coincides hunting periods set national legislation. our study prompted authorities impose closures part December raise catch Further, offer an equation can used monitoring tool estimating snout vent length animals skins. Studies like ours replicated different areas extrapolated other models.

Language: Английский

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Rapid evolution of testis size relative to sperm morphology suggests that post‐copulatory selection targets sperm number in Anolis lizards

Journal of Evolutionary Biology, Journal Year: 2019, Volume and Issue: 32(4), P. 302 - 309

Published: Jan. 19, 2019

Post-copulatory sexual selection is thought to be responsible for much of the extraordinary diversity in sperm morphology across metazoans. However, extent which post-copulatory targets versus production generally unknown. To address this issue, we simultaneously characterized evolution (length head, midpiece and flagellum) testis size (a proxy production) 26 species Anolis lizards, a group competition likely. We found that length has evolved 2-3 times faster than head or flagellum, suggesting may most important aspect with respect selection. any body size, supporting hypothesis acts more strongly upon morphology. Likewise, evolutionary increases typically indicate increased competition, are not associated predictable changes morphology, effects on either weak variable direction anoles. Collectively, our results suggest primary target lineage.

Language: Английский

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Do sex, body size and reproductive condition influence the thermal preferences of a large lizard? A study in Tupinambis merianae

Journal of Thermal Biology, Journal Year: 2015, Volume and Issue: 53, P. 198 - 204

Published: Oct. 1, 2015

Language: Английский

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Consistent Differences in Sperm Morphology and Testis Size between Native and Introduced Populations of Three Anolis Lizard Species

Journal of Herpetology, Journal Year: 2017, Volume and Issue: 51(4), P. 532 - 537

Published: Sept. 20, 2017

Sperm morphology can be highly variable among individuals and across species, but less is known about its variation populations. Within the past 20–80 yr, several species of Anolis lizards have been introduced to Miami, Florida, USA from different source islands in Caribbean, thereby permitting comparisons sperm between native populations multiple species. We collected samples sagrei (Bahamas), distichus (Dominican Republic), cristatellus (Puerto Rico) compared them each that are now sympatric Miami. In these three had with shorter tails larger midpieces relative also measured testis size A. found smaller testes for a given body their counterparts. The consistency differences argues against random genetic drift as an explanation, suggesting instead may exhibit predictable phenotypic plasticity or adaptation response process introduction and/or shared local environment Florida. Though population male reproductive physiology repeatable, underlying causes require further study.

Language: Английский

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A putative novel role for Eip74EF in male reproduction in promoting sperm elongation at the cost of male fecundity

Journal of Experimental Zoology Part B Molecular and Developmental Evolution, Journal Year: 2020, Volume and Issue: 336(8), P. 620 - 628

Published: July 28, 2020

Abstract Spermatozoa are the most morphologically variable cell type, yet little is known about genes controlling natural variation in sperm shape. Drosophila fruit flies have longest known, which evolving under postcopulatory sexual selection, driven by competition and cryptic female choice. Long outcompete short but primarily when females a long seminal receptacle (SR), primary storage organ. Thus, selection on length mediated SR length, two traits coevolving across lineage, genetic correlation fitness advantage of genotypes both males females. Ecdysone‐induced protein 74EF ( Eip74EF ) expressed during postmeiotic stages spermatogenesis spermatid elongation occurs, we found that it rapidly positive . Hypomorphic knockout E74A isoform leads to shorter does not affect suggesting may be involved promoting driver male–female coevolution. We also has opposing effects fecundity females, with an increase for decrease consistent its documented role oocyte maturation. Our results suggest novel function demonstrates this gene influences male reproductive success. speculate possible roles

Language: Английский

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Pre- and Postcopulatory Traits ofSalvatorMale Lizards in Allopatry and Sympatry

Scientifica, Journal Year: 2016, Volume and Issue: 2016, P. 1 - 9

Published: Jan. 1, 2016

The reproductive traits of males are under influence sexual pressures before and after copulation. strength selection varies across populations because they undergo varying competition for mating opportunities. Besides intraspecific pressures, individuals seem to be subjected driven by interspecific interactions in sympatry. Lizards may vary their strategies through characters, body size, gonadal investment, sperm traits. We evaluated the traits, involved pre- postcopulatory competition, allopatric sympatric Salvator lizards. observed a spatial gradient male among populations, with following order: zone S. rufescens ; zone; merianae . Accordingly, variation secondary character, relative testis mass, length component was between allopatry sympatry each species, suggesting differences investment However, we found that these two species did not differ characters Interestingly, trade-off testes muscle varied differently from social context on would affect lizard differently.

Language: Английский

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Modification of sperm quality after sexual abstinence in Seba's short-tailed bat,Carollia perspicillata

Journal of Experimental Biology, Journal Year: 2016, Volume and Issue: 219(9), P. 1363 - 1368

Published: May 1, 2016

ABSTRACT In polygynous mating systems, few males have stable access to sexual mates. With an expected higher copulation rate, harem may deplete seminal fluids or increase epididymal sperm maturation, generating poor quality. a first study, we reported quality in sneaker of Carollia perspicillata. To test whether the lower observed was generated by elevated temporarily removed both social statuses from colony. We thus assessed status-related changes resulting abstinence. Moreover, released territory and female guarding, were show reduction somatic costs. On basis competition models, predicted resource investment ejaculate with pre-copulatory efforts. line our predictions, improved significantly contrast males, whose did not change. Without lipid peroxidation, results also provide evidence that duration abstinence sufficient generate oxidative damage through senescence. Harem blood peroxidation ratio oxidized reduced glutathione. maintenance these costs, invest more superoxide dismutase maintain Our suggest difference rate rather than adaptation provides C.

Language: Английский

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