The Reproductive Cycle and the Size at Maturity of Tupinambis rufescens (Sauria: Teiidae) in the Dry Chaco of Argentina

Fitzgerald, Lee A.; Cruz, Félix Benjamín; Perotti, María Gabriela

doi:10.2307/1564908

Cited by 47 publications

(39 citation statements)

References 13 publications

(13 reference statements)

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“…Nevertheless, lizards in the genus Tupinambis are very similar in terms of their reproductive ecology (Fitzgerald et al . 1993; Herrera and Robinson 2000) and, to the best of our knowledge, there are no compelling arguments to establish a firm association between the polymorphism in sperm ultrastructure characters and differences in the reproductive ecology of the species.…”

Section: Discussionmentioning

confidence: 99%

Polymorphism in the sperm ultrastructure among four species of lizards in the genusTupinambis(Squamata: Teiidae)

et al. 2002

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We describe, for the first time, the ultrastructure of the spermatozoa of four species of the genus Tupinambis (Squamata, Teiidae). We identified seven polymorphic characters within this genus: the presence and shape of the perforatorial base plate, the presence of the epinuclear lucent zone, the presence of a unilateral ridge in the acrosome, the presence of a central density within the proximal centriole, the number of mitochondria and dense‐bodies sets, and the shape of mitochondria. We analysed the evolution of the seven polymorphic characters by mapping them onto a current phylogeny of the species of Tupinambis, using the teiids Ameiva ameiva and Cnemidophorus sexlineatus as outgroups. Our results indicate that sperm ultrastucture characters, although of great value for phylogeny at higher taxonomic levels in reptiles and other groups, are poor predictors of phylogeny when considering the species of Tupinambis studied here. We failed to identify evidences that homoplasy in sperm ultrastructure among the species of Tupinambis is due to convergent adaptation, suggesting that the polymorphism may be selectively neutral in this group.

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Section: Discussionmentioning

confidence: 99%

Polymorphism in the sperm ultrastructure among four species of lizards in the genusTupinambis(Squamata: Teiidae)

et al. 2002

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“…Such data may provide a useful basis for recommendations directed to the particular systems in which the studies have been conducted (e.g. Fitzgerald et al, 1991Fitzgerald et al, , 1993. Unfortunately, it may be dicult to generalise such results to other systems (areas, species) unless we can also gain an understanding of the processes involved in determining vulnerability of an animal to anthropogenic sources of mortality.…”

Section: Introductionmentioning

confidence: 99%

The dangers of leaving home: dispersal and mortality in snakes

Bonnet

Naulleau

Shine

1999

Biological Conservation

300

198

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For animal populations in many parts of the world, direct (albeit often accidental) killing by humans may be a signi®cant source of mortality. Many snakes are killed by people (especially by automobiles) every year, but the determinants of a snake's vulnerability to anthropogenic mortality (and thus, patterns of mortality with respect to sex, age and season) are poorly known. We present data on 652 French snakes of six species (Coluber viridi¯avus, Elaphe longissima, Natrix maura, N. natrix, Vipera aspis, V. berus) killed either by natural predators, domestic animals or humans (including roadkills). We used information on seasonal patterns of mortality (plus information on population structure from 338 captures of live snakes) to test the hypothesis that snakes are killed mostly when they disperse from their usual home ranges. This hypothesis generates several falsi®able predictions on the expected correlates of mortality rates; most of these predictions are supported by our data. For example, young-of-the-year snakes are killed primarily in the period immediately after hatching (while they disperse); subadults (which are sedentary) generally experience low mortality rates; adult males are killed mainly during the mating season (especially in species where mate-searching males travel widely); and adult females in oviparous species are killed during their egg-laying migrations. Relative to population density, species that use frequent long-distance movements in foraging experience higher mortality than sedentary ambush foragers. In one species (E. longissima), larger males are more at risk. The success of these predictions suggests that movement patterns of snakes may oer valuable indices of their vulnerability to direct anthropogenic mortality. #

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“…It is important to note that the fibrous sheath is present both in the midpiece and principal piece in lizards (Tavares-Bastos et al, 2002). Thus, enhanced energy production could influence the capability of sperm to survive longer inside female reproductive tracts (Parker & Begon, 1993), being important in this case because females are still not ready to ovulate in that moment (Fitzgerald et al, 1993;Naretto et al, 2016a, b). In a sister species, S. merianae, the average time between mating and oviposition was 22 days, ranging from 7 to 33 days and suggesting variation in the period of sperm retention in female genital ducts (Garcia Valdez et al, 2011).…”

Section: Discussionmentioning

confidence: 99%

Relationship between pre- and post-copulatory traits inSalvator rufescens(Squamata: Teiidae)

Blengini

Naretto

Cardozo

et al. 2016

Biol. J. Linn. Soc.

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Understanding pre‐ and post‐copulatory mechanisms of sexual selection can provide insights into the evolution of male reproductive strategies. The phenotype‐linked fertility hypothesis postulates that male sperm quality and secondary sexual characteristics will positively co‐vary, whereas the sperm competition hypothesis predicts a negative association between those traits. Male reproductive traits often show variation throughout the reproductive period, suggesting that the relationship between pre‐ and post‐copulatory sexual selection may vary temporally. Here, we evaluated the relationship between secondary sexual character and sperm traits and its temporal variation in Salvator rufescens, a south American lizard. We observed a negative relationship between jaw muscle and principal piece length of sperm and a variation in the relationship between pre‐ and post‐copulatory traits throughout the reproductive period. Collectively, our results evidenced a trade‐off between pre‐ and post‐copulatory traits and a strong seasonal flexibility of male reproductive strategies in this lizard species.

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The Reproductive Cycle and the Size at Maturity of Tupinambis rufescens (Sauria: Teiidae) in the Dry Chaco of Argentina

Cited by 47 publications

References 13 publications

Polymorphism in the sperm ultrastructure among four species of lizards in the genusTupinambis(Squamata: Teiidae)

Polymorphism in the sperm ultrastructure among four species of lizards in the genusTupinambis(Squamata: Teiidae)

The dangers of leaving home: dispersal and mortality in snakes

Relationship between pre- and post-copulatory traits inSalvator rufescens(Squamata: Teiidae)

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