https://www.alice.cnptia.embrapa.br/alice/handle/item/97 Artigo em periódico indexado (CPAA) 2026-07-31T01:06:45Z https://www.alice.cnptia.embrapa.br/alice/handle/doc/1188743 Título: Palm assembly dynamics and its relationship with topography in terra firme forest in the Central Amazon. Autoria: MELO NETO, P. R. de; OLIVEIRA, M. de F.; PEREIRA, O. de S.; SCARIOT, A. O.; HENDERSON, A. J.; PACHECO, M. A. W.; CAMARGO, J. L. C. Conteúdo: In recent years, studies have reported changes in the structure of different taxonomic groups in tropical forests without any apparent environmental disturbances. Changes in forest phytosociology, climate change, or even stochastic variation may be responsible for the observed results. Factors such as topography may mitigate or amplify these effects. We analyzed the long-term dynamics of an assembly of palm species in a 10-ha permanent plot within a continuous, mature forest in the Central Amazon. A previous census was conducted in 1990. As previously, all newly found adult palms were marked, identified, and classified by forest strata. Thus, we evaluated assembly dynamics overall and by strata, considering abundance, composition, and beta diversity. All parameters were contrasted with topography. We recorded 33 palm species, three more species than in 1990, and an impressive increase in abundance. Even with 1/3 of mortality, the net increase of the assembly was almost 50%, revealing a dramatic change in density from around 650 to almost 1000 adult palms per hectare. Mortality among the sub-canopy palm trees was more pronounced than for other strata. Meanwhile, the forest's understory presented the highest diversity. Species gain over time drove changes in the assemblage composition. Regarding topography, elevation influenced species distribution, while slope affected understory and assemblage dynamics. Thus, changes in the palm assemblage showed that even in forests considered preserved, certain groups are undergoing structural changes, which may be related to internal assemblage factors or external drivers, such as climate change and stochastic effects. 2026-01-01T00:00:00Z https://www.alice.cnptia.embrapa.br/alice/handle/doc/1188201 Título: Plant growth- promoting bacteria inoculation and co-inoculation effects on Palisade grass (Urochloa brizantha cv. Marandu) in ferralsol in Amazonas State, Brazil. Autoria: BATISTA, S. R.; MAJOLO, C.; PERIN, R.; NOGUEIRA, M. A.; HUNGRIA, M.; OLIVEIRA-PAIVA, C. A.; SÁ, E. L. S. de; MÜLLER, C.; LOPES, M. T. G.; MUNIZ, A. W. Conteúdo: Deforestation is primarily driven by three main factors the conversion of the Amazon rainforest into pastureland, agriculture, and mining, as well as land invasion. These pastures are mostly degraded, and it is necessary to restore their productive capacity. Microbial inoculants can be used to increase nutrient use efficiency. The objective of this study was to evaluate the effects of inoculation and co-inoculation of the bacteria Rhizobium anhuiense (RZ), Azospirillum brasilense (AZ) and Pseudomonas fluorescens (PF) on the growth of the grass Urochloa brizantha cv. Marandu. The field experiment with inoculants in U. brizantha was carried out in a randomized block design with four replications. The treatments consisted of different doses of NPK and types of inoculation. The variables used in the evaluation were plant height, number of tillers, productivity, and foliar NPK content. The results showed an interaction between fertilizer doses and inoculation treatments for variables such as number of tillers and productivity. Co-inoculation positively influenced productivity and plant nutrient content in some combinations and fertilizer doses. These findings suggest that inoculation and co-inoculation with different bacteria used different fertilizer doses, increasing the number of tillers, dry mass (P and K), and yield of Palisade grass as observed in co-inoculation with AZ + RZ. 2026-01-01T00:00:00Z https://www.alice.cnptia.embrapa.br/alice/handle/doc/1188102 Título: Efeito anti-helmíntico in vitroda espécie Andira vermifugacontra Neoechinorhynchus buttnerae. Autoria: PEREIRA, T. B.; LOPES, E. V.; CHAGAS, E. C.; PEREIRA, D. da S.; POHLIT, A. M. Conteúdo: RESUMO: A infecção pelo acantocéfaloNeoechinorhynchus buttneraeconstitui um dos principais entraves à produção de tambaqui (Colossoma macropomum) na Amazônia. Este estudo avaliou a atividade anti-helmíntica in vitrode extratos e frações deAndira vermifugacontraN. buttnerae. As folhas foram secas, trituradas e submetidas à maceração sequencial com solventes de polaridade crescente (hexano, acetato de etila e metanol). O extrato metanólico e as frações hidroalcoólicas dos extratos hexânico e de acetato de etila foram testados in vitrocontra acantocéfalos de tambaquis naturalmente infectados. Todas as amostras promoveram 100% de mortalidade deN. buttneraeapós 24 h nas concentrações de 25 e 50 mg/L. A fração hidroalcoólica do extrato em acetato de etila foi a mais promissora, atingindo 100% de mortalidade em 6 h a 25 mg/L e apresentando elevada eficácia mesmo em baixas concentrações. Os resultados evidenciam o potencial de extratos de média polaridade de plantas amazônicas como fonte de compostos antiparasitários eficazes no controle de infecções que afetam a piscicultura do tambaqui. ABSTRACT: Infection by the acanthocephalan Neoechinorhynchus buttnerae is one of the main obstacles totambaqui (Colossoma macropomum) production in the Amazon. This study evaluated the in vitro anthelmintic activity of extracts and fractions of Andira vermifuga against N. buttnerae. The leaves were dried, crushed, and subjected to sequential maceration with solvents of increasing polarity (hexane, ethyl acetate, and methanol). The methanolic extract and the hydroalcoholic fractions of the hexane and ethyl acetate extracts were tested in vitro against acanthocephalans of naturally infected tambaqui. All samples promoted 100% mortality of N. buttnerae after 24 h at concentrations of 25 and 50 mg/L. The hydroalcoholic fraction of the ethyl acetate extract was the most promising, achieving 100% mortality in 6 hours at 25 mg/L and showing high efficacy even at low concentrations. The results highlight the potential of medium-polarity extracts from Amazonian plants as a source of effective antiparasitic compounds for controlling infections affecting tambaqui fish farming. RESUMEN: La infección por el acantocéfalo Neoechinorhynchus buttnerae es uno de los principales obstáculos para la producción de tambaquí (Colossoma macropomum) en la Amazonía. Este estudio evaluó la actividad antihelmíntica in vitro de extractos y fracciones de Andira vermifuga contra N. buttnerae. Las hojas se secaron, trituraron y se sometieron a maceración secuencial con solventes de polaridad creciente (hexano, acetato de etilo y metanol). El extracto metanólico y las fracciones hidroalcohólicas de los extractos de hexano y acetato de etilo se probaron in vitro contra acantocéfalos de tambaquí infectado naturalmente. Todas las muestras promovieron una mortalidad del 100% de N. buttnerae después de 24 h a concentraciones de 25 y 50 mg/L. La fracción hidroalcohólica del extracto de acetato de etilo fue la más prometedora, alcanzando una mortalidad del 100 % en 6 horas a 25 mg/L y mostrando una alta eficacia incluso a bajas concentraciones. Los resultados destacan el potencial de los extractos de polaridad media de plantas amazónicas como fuente de compuestos antiparasitarios eficaces para el control de infecciones que afectan a la piscicultura de tambaquí. 2026-01-01T00:00:00Z https://www.alice.cnptia.embrapa.br/alice/handle/doc/1187826 Título: Geographical traceability of Manilkara huberi (Ducke) A. Chev. by chemical signature. Autoria: SILVA, A. C. L. da; LOPES, M. T. G.; TOMAZ, J. S.; VALENTE, M. S. F.; BEZERRA, C. de S.; CAPUCHO, H. L. V.; MARQUES, R. L. S.; LOPES, R.; PEREIRA, A. M.; FERREYRA RAMOS, S. L. Conteúdo: This study evaluated the potential of Total Reflection X-ray Fluorescence (TXRF) as a geochemical traceability method for wood from Manilkara huberi (Ducke) A. Chev., a species of high commercial and ecological value widely exploited in the Legal Amazon. Wood samples were collected in eight locations in the states of Amazonas, Pará, Rondônia, and Roraima, representing different edaphic, geological, and climatic conditions in the context of Amazonian edaphic and geological variability. The multielemental analysis revealed significant variations in trace element and macronutrient concentrations (Fe, Mn, K, Ca, Sr, Rb), reflecting the specific geochemical signatures of each region. Multivariate analyses (PCA and NMDS) showed distinct groupings among the populations, confirming the discriminatory capacity of TXRF in the differentiation of geographical origins. Significant correlations between elements such as K × Rb and Cr × Fe demonstrated consistent patterns of coaccumulation and antagonism associated with local geochemistry. The results prove the efficiency of TXRF as a non-destructive, sensitive, and low-cost technique for origin authentication and forensic investigation of Amazonian wood, strengthening sustainable management policies and combating illegal exploitation. The proposed methodology is a scientific advance in forest traceability and biodiversity conservation, contributing to the transparency and legality of timber production chains in the Amazon. 2026-01-01T00:00:00Z