Abstract This study analyzed the parasitism by Clinostomum sp. metacercariae of the neotropical fish Cichlasoma paranaense (Kullander 1983) and environmental variables’ influence on their host-parasite relationship in Central Brazil. Fish were collected in five impoundments (I) from three towns: Itauçú (n = 2), Inhumas (n = 1), and Goiânia (n = 2), Goiás State, Brazil. Ninety-five fish were analyzed, weighted and length measured. Afterward, the presence of metacercariae in the gills, muscles, fins, and body cavities was investigated. The metacercariae were fixed in AFA solution, kept in 70% alcohol, and stained with carmine. The infection prevalence revealed that 0.64, 0.56 and 0.91% of fish was infected. The abundance was 4.14, 3.22 and 5.88, with a mean intensity of 6.44, 5.80 and 6.42 per impoundment (I 13, I 15 and I 16), respectively. The frequency of metacercariae was higher in fish collected in Goiânia. High frequency of parasites was observed in the gills, muscles, and fins. The limnological variables did not present direct interference in the parasitism. The fish’ standard length influenced the number of metacercariae positively but did not differ to the relative condition coefficient.

RESUMO Apesar da elevada riqueza de anfíbios e répteis conhecida para a porção Sul-Ocidental da Amazônia brasileira, o conhecimento sobre estes é pontual e poucos estudos avaliaram as variações temporais na ocorrência e abundância das espécies. Os objetivos deste estudo foram descrever as taxocenoses de anfíbios e répteis em uma localidade da Reserva Extrativista Chico Mendes, verificar quais variáveis climáticas influenciam as flutuações temporais na riqueza e abundância e identificar as principais espécies de anfíbios e répteis influenciadas por elas. A área de estudo está localizada na região do Seringal Etelvi, porção sudoeste da Reserva, município de Brasiléia, estado do Acre. A coleta de dados ocorreu entre outubro de 2011 e setembro de 2012, num total de 48 dias de amostragem, com os métodos de procura limitada por tempo e armadilhas de interceptação e queda. Foram registrados 978 espécimes de 31 espécies de anfíbios e 54 de répteis. Maior riqueza e abundância de anfíbios ocorreram durante o período chuvoso, sendo a abundância associada positivamente com a temperatura média. Apenas a abundância de répteis foi maior durante o período chuvoso. Porém, tanto riqueza quanto abundância mensais foram associadas positivamente com a temperatura média. Quatro anfíbios, Allobates gr. marchesianus, Hamptophryne boliviana (Parker, 1927), Hypsiboas geographicus (Spix, 1824) e Rhinella marina (Linnaeus, 1758), e dois répteis, Kentropyx pelviceps Cope, 1868 e Norops fuscoauratus (D’Orbigny, 1837), tiveram suas abundâncias mensais associadas positivamente com a temperatura média. O lagarto Dactyloa punctata (Daudin, 1802) teve a abundância mensal associada com a precipitação. Foi possível verificar o aumento da riqueza e abundância de anfíbios e répteis durante períodos em que a disponibilidade de recursos é favorável para muitas espécies. As espécies podem reagir de formas diferentes às variações climáticas, enquanto algumas são sensíveis às flutuações, outras parecem não responder facilmente ou não reduzir suas abundâncias em períodos potencialmente desfavoráveis.

ABSTRACT Despite the high richness of amphibians and reptiles known for the southwestern portion of the Brazilian Amazon, the knowledge of these is punctual and few studies have evaluated the temporal variations in the occurrence and abundance of species. The goals of this study were to present the amphibians and reptiles assemblages in a locality of the Chico Mendes Extractive Reserve, verify which climate variables influence the temporal fluctuations in richness and abundance, and identify the main species of the amphibians and reptiles influenced by them. The study area is located in the Seringal Etelvi region, southwestern portion of the Reserve, municipality of Brasiléia, state of Acre. Data collection took place between October 2011 and September 2012, for 48 sampling days, using the methods of searches limited by time and pitfall traps. There were recorded 978 specimens of 31 amphibians and 54 reptiles. Higher richness and abundance of amphibians occurred during the rainy season, with the monthly abundance positively associated with the mean temperature. Only the abundance of reptiles was higher during the rainy period. However, both richness and abundance were positively associated with mean temperature. Four amphibians, Allobates gr. marchesianus, Hamptophryne boliviana (Parker, 1927), Hypsiboas geographicus (Spix, 1824) and Rhinella marina (Linnaeus, 1758), and two reptiles, Kentropyx pelviceps Cope, 1868 and Norops fuscoauratus (D’Orbigny, 1837), had their monthly abundances positively associated with the mean temperature. The lizard Dactyloa punctata (Daudin, 1802) had the monthly abundance associated with precipitation. It was possible to verify the increase of richness and abundance of amphibians and reptiles during periods when the availability of resources is favorable for many species. Species can react differently to climatic variations, whereas others are sensitive to fluctuations, others seem answer easily or not reduce their abundances in periods theoretically unfavorable.

The goal of this study was to assess the population structure of Pseudis bolbodactyla Lutz, 1925 using natural markings to identify individuals. Recruitment, survival, and population size estimations were obtained using the Jolly-Seber stochastic method. A total of 166 individuals were captured, and the striped, spotted, and dotted patterns that make their recognition possible were recorded. Of the specimens captured, 27 were recaptured, including some at pre and post-metamorphic stages. The estimate maximum population size was 52. The indices of survival and recruitment varied among samplings. Sexual dimorphism in size and in the operational sex ratio were detected. Despite the limited scope of our characterization of the P. bolbodactyla population, our data might be useful in the interpretation and elaboration of new hypotheses about ecological processes acting on anuran populations.