A região amazônica concentra a maior riqueza de serpentes do Brasil, entretanto algumas localidades possuem a fauna sub-amostrada. A microrregião de Alvorada Do Oeste é a menos amostrada quanto a presença de serpentes no Estado de Rondônia. Os registros ocasionais correspondem a uma metodologia complementar a outros métodos herpetofaunísticos, representando muitas vezes grande parte da amostra. Este estudo surgiu com a finalidade de apresentar a presença de espécies de serpentes por meio de encontros ocasionais e/ou por terceiros no município de Alvorada do Oeste, estado de Rondônia. Para avaliar as serpentes foi solicitado a voluntários que enviassem imagens de serpentes encontradas no município. Foram recebidas imagens e relatos de 20 serpentes, divididas em 11 espécies e quatro famílias, sendo Boa constrictor a espécie de maior representatividade com seis registros. Algumas espécies possuem hábitos florestais e dependem de ambientes bem conservados ou com pouco nível de antropização e outras espécies registradas aqui não são comuns em outros estudos realizados no Estado de Rondônia. Apesar de algumas espécies apresentarem ampla distribuição geográfica, ainda existem poucas informações acerca das serpentes da região, evidenciando a necessidade desse estudo. O total de espécies registrado no presente estudo pode não representar a fauna real, visto que somente um método amostral foi utilizado. Sugere-se que novos estudos sejam realizados a fim de conhecer ainda melhor a fauna de serpentes da região, empregando outros métodos e ampliando o esforço amostral, visando a maior representatividade de serpentes nas localidades estudadas.
The fossorial snake Apostolepis kikoi Santos et al., 2018 is known only from its type locality, in Chapada dos Guimarães, state of Mato Grosso, Brazil. Here, we present the first records of this species after its description, expanding its distribution to transition areas between the Amazon and Cerrado biomes, in the southwestern portion of Mato Grosso. The new record expands the known distribution of A. kikoi by 297 km west from the type locality. In addition, we provide data on morphological variation by comparing our sample with the type series.
The tegus are generalists lizards that use large amounts of prey in its diet, providing environmental services as a biological controller and seed disperser, which reveals how important diet studies are to understand ecological relationships related to a particular species. So the objective of this study was to analyze diet and food ontogeny of T. matipu, investigating changes in the pattern and composition of food items in different age classes and how the species shares its intraspecific niche. The captured specimens had the contents of their digestive tracts were analysed qualitatively and quantitatively. Our results indicate that T. matipu is a generalist lizard, consuming many food items, which fruits are the most important item in its diet. However, the species uses food resources in different importance proportions, according to its age class. Fruit consumption tends to increase and arthropods consumption decline as the age class increase. Thus, T. matipu performs an intraspecific sharing of feeding niche between the age classes and constitutes potential seed dispersers in its populations distributed along the Upper Course of the Paraguai River.
Lithodytes lineatus (Schneider, 1799) is a small, litter-dwelling frog widely distributed in the Amazon Ecoregion and some transitional areas between the Amazon and Cerrado. Here we report seven new records of this species in a transitional zone between Amazon, Chiquitano Dry Forest and Cerrado ecoregions in the state of Mato Grosso, Brazil. These are the southernmost records of the species, expanding its distribution in 320 km from the nearest record in Bolivia.
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