Caracteriza-se pelo predomínio de grandes lagoas, como a Mirim e a Mangueira, canais de interligação entre estas e lagoas menores , cortando os campos e também massas d 'água sazonais . A leste do grande banhado do Taim , entre este e o Atlântico, estende-se uma larga faixa de dunas. A oeste do banhado, em direção à lagoa Mirim, predominam campos de pastagem baixos , inundáveis nas épocas de maior precipitação. Campos com iguais características estendem-se também ao norte do banhado (campos de Albardão) e ao sul, na área da Fazenda Santa Marta. a oeste da lagoa Mangueira ( fig. 1).
MATERIAIS E MÉTODOS
Reptiles were collected during a period of two years in the Estação Ecológica do Taim, in the southeastern part of the state of Rio Grande do Sul, in a region characterized by large extensions of swamps, sand dunes and prairies. Out of 81 species of reptiles known from the State 21 have been collected in the station. Freshwater turtles are most abundant; others groups are poorly represented
ABSTRACT. Sexual identification using anatomical study of urogenital system in hatchlin gs and juvcniles oftracHelllYs tlorbigl/yi (Du lll Provavelmente, este mecanismo de determinação sexual também ocorre em Trachemys dorbignyi Duméril & Bibron, 1835. Estas informações são de muita importância, especialmente para os projetos de preservação de quelónios. Se a determinação do sexo é influenciada pela temperatura de incubação dos ovos, existe a possibilidade de serem devolvidos à natureza unicamente machos ou fêmeas, caso a temperatura de incubação não esteja adequada. VOGT (1994) salienta que isso muitas vezes vem ocorrendo.Em indivíduos recém-eclodidos de Trachemys dorbignyi e aproximadamente até os dois ou três anos de idade não é possível distinguir machos e fêmeas por características externas. Por isso, um acompanhamento anatómico das gónadas torna-se fundamental para a identificação do sexo.
Das 67 espécies de anfíbios conhecidas do Rio Grande do Sul, 18 foram coletadas na Estação Ecológica do Taim, no sudeste deste Estado. Os Leptodactylidae são os mais diversificados na área, e os Hylidae os mais numerosos em indivíduos. Out of the 67 species of amphibians known from Rio Grande do Sul, 18 were collected at the Estação Ecológica do Taim, in the southeastern part of that State. The Leptodactylidae are the most diversified ir the area, whereas the Hylidae were the most numerous in individuai
From 1985 to 1994 the reproductive biology and nesting behaviour of d'orbigny's slider turtle Trachemys clorbignyi were studied at Sao Paulo Zoo. The mating season was from April to July and the egglaying season was from mid‐August to mid‐January. Nesting activity, which was similar to that reported for other species in the Chrysemys complex, was more frequent in the morning and could be divided into five distinct stages: nest‐site selection, nest excavation, egg laying, nest covering and return to water. Nests comprised a cylindrical neck and an oval incubation chamber, the dimensions of which were related to the type of substrate being excavated. Mean clutch size was 8.86 eggs (range = 1–18; n = 530 clutches). Eggs were ellipsoidal and were a mean 3.90 cm long, 2.54 cm wide and 14.07 g. Some ♀♀ laid at least two clutches in a season. The eggs were artificially incubated and mean incubation time was between 55.2 days at 31.5°C and 104.2 days at 25°C. Hatchlings had a mean carapace length of 3.55 cm, maximum carapace width of 3.34 cm and weight of 10.73 g.
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