Reproductive Ecology of Tropidurus torquatus (Squamata: Tropiduridae) in the Highly Seasonal Cerrado Biome of Central Brazil

Wiederhecker, Helga C.; Pinto, Adriana C. S.; Colli, Guarino R.

doi:10.1670/0022-1511(2002)036[0082:reotts]2.0.co;2

Cited by 60 publications

(44 citation statements)

References 37 publications

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“…However, some authors assure that the reproductive activity of tropical species inhabiting seasonal environments is under the effects of rainfall (Colli, 1991;Van Sluys et al, 1987). The few studies that include a large number of locations hinder a better understanding of the association between reproductive activity and environmental factors on the lizards of the genus Tropidurus (Wiederhecker et al, 2002). However, important information about the reproductive activity of Neotropical lizards has arisen from studies of members from the family Tropiduridae (sensu Frost et al, 2001).…”

Section: Resultsmentioning

confidence: 99%

“…However, important information about the reproductive activity of Neotropical lizards has arisen from studies of members from the family Tropiduridae (sensu Frost et al, 2001). In general, tropidurid lizards present their reproductive cycle in seasonal habitats; and studies on the ecology and reproductive cycles of some species of the genus Tropidurus has currently been studied, including T. etheridgei (Cruz, 1997), T. spinulosus (Cruz et al, 1997), T. semitaeniatus (Vitt & Goldberg;Ribeiro et al, 2010); T. montanus (Van Sluys et al); T. hispidus (Vitt & Goldberg;Vitt et al, 1996), T. oreadicus (Rocha & Bergallo, 1990), T. itambere (Van Sluys;Ferreira et al, 2009) and T. torquatus (Bergallo & Rocha, 1993Giaretta, 1996;Vieira et al;Wiederhecker et al) (see Table III). …”

Section: Resultsmentioning

confidence: 99%

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Reproductive Strategies of Brazilian Lizards of the Genus Tropidurus Rodrigues, 1987 (Squamata, Tropiduridae) in the Temporal and Spatial

2011

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Estrategias Reproductivas de las Lagartijas Brasileñas del Género SUMMARY:Reproductive strategy is the set of adaptations that promote the most efficient way that the species will survive under the particular conditions of a determined environment. Understanding these adaptations is important and can help pinpoint populations indicator of environmental changes. Spermatogenesis is a measurable biological process of these adaptations in spatial and temporal scales. We analyzed the morphology of the testes and oviducts of the lizard species that comprise the genus Tropidurus, taking into account the geographical distribution and sympatric relations. For the analysis and the testes were removed from the middle part of the oviducts from Tropidurus etheridge, T. oreadicus, T. itambere, T. spinulosus and T. Guarani species, collected in different places in the Mato Grosso state, Brazil. The reproductive period is synchronous for males and females and occurs in September, October and November. Reproductive males were characterized. In the testes are seminiferous tubules with germ cells at different stages of spermatogenesis, with a high epithelium, at present light, free spermatozoa in the lumen and reduction of interstitial tissue. For females, the reproduction peak occurs when the oviduct epithelium is high with secretions and basal nucleus. These months are characterized in the sampled areas over a period of heavy rain and high temperatures. The decline of reproductive period was observed in both sexes, between April and August. Low reproduction in males is characterized by ample light, absence of sperm, only germ cells in the early stages of spermatogenesis are observed (a few spermatogonia and spermatocytes) and interstitial tissue wide. In females, the period of reproductive decline is marked by the absence of unicellular glands in the oviduct epithelium, with higher affinity with the dye. This period corresponds to low rainfall periods and lower temperatures. We propose an analysis of zoological samples; this is a proposal to facilitate the work of many researchers through access to the species, especially rare species.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Reproductive Strategies of Brazilian Lizards of the Genus Tropidurus Rodrigues, 1987 (Squamata, Tropiduridae) in the Temporal and Spatial

2011

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“…From February to April, a period of degeneration for the seminiferous tubules, spermatogenesis was interrupted. The seminiferous tubules were T. hispidus (Prieto et al, 1976), T. delanonis (Werner, 1978), T. quadrivittatus and T. theresioides (Goldberg and Rodrigues, 1986), and T. torquatus (Vieira et al, 2001;Wiederhecker et al, 2002) living in seasonal localities ductive cycle and lives in the Argentinian Chaco (Cruz, 1997), a region with predictable seasonality.…”

Section: Resultsmentioning

confidence: 99%

Seasonal changes in testicular and epididymal histology of the tropical lizard, Tropidurus itambere (Rodrigues, 1987), during its reproductive cycle

et al. 2009

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The reproductive cycles of lizards, including Tropidurus species, have been widely studied. However, few studies describe in detail the ultrastructure and the epithelial changes in the epididymis. Using histology and trasmission electron microscopy, we show the seasonal changes in the testis and epididymis of the lizard Tropidurus itambere, during its annual reproductive cycle. The reproductive cycle of T. itambere was analysed from June 1988 to June 1989 and from June 2001 to June 2002. While the frequency of reproductive males in the population varied throughout the year, there were reproductive males in most months except for February through April. During this nonreproductive period, there is a reduction in the mean seminiferous tubule volume and few sperm were found in both the testis and the epididymis.Keywords: spermatogenesis, reproduction, lizard, ultrastructure, Reptilia. Mudanças sazonais na histologia do testículo e epidídimo do lagarto tropical Tropidurus itambere, durante seu ciclo reprodutivoResumo O ciclo reprodutivo de alguns lagartos já foi extensamente estudado, incluindo algumas espécies do gênero Tropidurus. Entretanto, poucos estudos mostram os aspectos morfológicos do testículo e epidídimo, durante o ciclo reprodutivo anual, e não existe nenhuma descrição ultraestrutural das variações epiteliais no epidídimo. O presente estudo foi feito para mostrar, através da histologia e microscopia eletrônica de transmissão, detalhes das mudanças sazonais no testículo e epidídimo durante o ciclo reprodutivo anual. Acompanhamos o ciclo de Tropidurus itambere, na floresta atlântica brasileira, durante o período de junho de 2001 a junho de 2002. Os machos variam em sua atividade reprodutiva, mas foram considerados potencialmente reprodutivos na maioria dos meses, à exceção dos meses de fevereiro a abril. Durante este período, ocorreu uma redução no volume médio dos túbulos seminíferos e uma menor quantidade de espermatozóides no testículo e no epidídimo.

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“…Unidentified arthropod remains were grouped in a separate category, and were considered only for volumetric analyses. To estimate the volume (mm 3 ) of each prey, we used the ellipsoid formula, modified by Wiederhecker et al (2002):…”

Section: Collecting Methods and Analysismentioning

confidence: 99%

Effects of a fire on a population of treefrogs (Scinax cf. alter, Lutz) in a restinga habitat in southern Brazil

et al. 2008

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The area of the Dunas da Joaquina, in Santa Catarina island, contains one of the most important remnants of restinga habitat in Santa Catarina State, southern Brazil. In December 2003, a fire occurred in a portion of this area, affecting most of the vegetation, including the bromeliad community. In this study, the density of individuals and the diet composition of the bromelicolous treefrog Scinax cf. alter were compared between the area affected by the fire and an adjacent unburned area. One-hundred-and-fifty-eight ground bromeliads (Vriesea friburguensis) were dissected and searched for the presence of treefrogs among their leaves. We found 30 frogs in 29.5% (23/78) of the bromeliads from the unburned site, with a mean of 1.3 frogs per rosette, and 15 frogs in 12.5% (10/80) of the bromeliads from the burned site, with a mean of 1.6 frogs per rosette. Eight (27%) of the frogs from the unburned site and eleven (73%) of those from the burned site had empty stomachs. Frogs from the burned site also contained less prey per stomach than those from the unburned site. The data suggest that the fire has negatively affected the local population of Scinax cf. alter, though it is possible that the population can recover.Keywords: bromeliad, disturbance, fire, restinga, Anura, Scinax cf. alter. Efeitos de uma queimada em uma população de pererecas (Scinax cf. alter) em um habitat de restinga no sul do Brasil ResumoA área das Dunas da Joaquina, na Ilha de Santa Catarina, contém um dos remanescentes mais importantes de habitat de restinga no Estado de Santa Catarina, no Sul do Brasil. Em dezembro de 2003, ocorreu uma queimada em uma porção desta área, afetando a maior parte da vegetação, incluindo a comunidade de bromélias. Neste estudo, comparamos a densidade de indivíduos e a composição da dieta da perereca bromelícola Scinax cf. alter entre a área afetada pelo fogo e a uma área adjacente que não foi afetada. Cento e cinqüenta e oito bromélias de chão (Vriesea friburguensis) foram dissecadas e examinadas quanto à presença de pererecas entre suas folhas. Foram encontradas 30 pererecas em 29,5% (23/78) das bromélias da área não-queimada, com uma média de 1,3 indivíduos por roseta; e 15 pererecas em 12,5% (10/80) das bromélias da área queimada, com uma média de 1,6 indivíduos por roseta. Oito (27%) dos animais da área não-queimada; e onze (73%) dos da área queimada estavam com o estômago vazio. As pererecas da área queimada também tiveram menos presas por estômago que as da área não-queimada. Os dados sugerem que o fogo afetou negativamente a população local de Scinax cf. alter, embora seja possível a sua recuperação.

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Reproductive Ecology of Tropidurus torquatus (Squamata: Tropiduridae) in the Highly Seasonal Cerrado Biome of Central Brazil

Cited by 60 publications

References 37 publications

Reproductive Strategies of Brazilian Lizards of the Genus Tropidurus Rodrigues, 1987 (Squamata, Tropiduridae) in the Temporal and Spatial

Reproductive Strategies of Brazilian Lizards of the Genus Tropidurus Rodrigues, 1987 (Squamata, Tropiduridae) in the Temporal and Spatial

Seasonal changes in testicular and epididymal histology of the tropical lizard, Tropidurus itambere (Rodrigues, 1987), during its reproductive cycle

Effects of a fire on a population of treefrogs (Scinax cf. alter, Lutz) in a restinga habitat in southern Brazil

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