23 documents found, page 1 of 3

Pervasive gaps in Amazonian ecological research

Biodiversity loss is one of the main challenges of our time,1,2 and attempts to address it require a clear un derstanding of how ecological communities respond to environmental change across time and space.3,4 While the increasing availability of global databases on ecological communities has advanced our knowledge of biodiversity sensitivity to environmental changes,5–7 vast areas of the tropics remain underst...

Seasonality effect on ant (Hymenoptera: Formicidae) activity in an ecotonal env...

This study aimed to compare the activity of ants during the rainy and dry seasons in a transitional environment (ecotone) at the interface of Cerrado and Caatinga biomes situated in the state of Piauí, where studies of local ant fauna are still incipient. The research was carried out at Floriano, state of Piauí, Brazil. Ants were sampled during the rainy season in December 2018 and during the dry season in June...

Notes on biology of Brazilian populations of ants of the Pachycondyla foetida s...

Neuropile organization in the brain of Acromyrmex (Hymenoptera, Formicidae) dur...

A neurópila é a região do sistema nervoso central onde ocorrem as sinapses entre as ramificações dos neurônios. Durante o desenvolvimento de um inseto holometábolo pode ocorrer a quebra das fibras dos neurônios formando novos axônios e dendritos e sua distribuição na neurópila do cérebro é organizada de modo a refletir funções específicas do sistema nervoso dos insetos adultos. Os componentes desta organização ...

Structural changes in arboreal ant assemblages (Hymenoptera: Formicidae) in an ...

A study of succession of ant species in plantations of different ages and development may assist with our understanding of the dynamics of their assemblages. The aim of this study was to characterise the relationship between development of Brazilian cocoa plantations and the nature of their dominant ant assemblages. A chronosequence of cocoa plantations aged 1, 3, 4, 8, 15 and 33 years was sampled by several me...

Banding patterns of three leafcutter ant species of the genus Atta (Formicidae:...

Os gêneros Acromyrmex e Atta são de grande importância entre as formigas neotropicais devido a sua posição entre as pragas agrícolas. O gênero Atta é considerado um dos mais derivados da tribo Attini e dados citogenéticos estão disponíveis para cinco táxons que apresentam 2n = 22 cromossomos, enquanto que informações sobre padrões de bandamentos estão disponíveis apenas para Atta colombica. A citogenética tem c...

Caracterização de ninhos e tamanho de colônia de Acromyrmex rugosus (F. Smith) ...

Oito ninhos de Acromyrmex rugosus foram escavados para estudar sua estrutura e estimar sua população. Esses ninhos eram sempre encontrados escondidos por plantas; apresentaram pequena quantidade de solo e tinham 1 ou 2 entradas; uma delas tinham a forma de um "U" invertido. Internamente, o número de câmaras foi variável e o volume de fungo foi pequeno(X=196 ml). O total da população do ninho foi aproximadamente...

Diversity of ants in citrus orchards and in a forest fragment in Southern Brazil

Abstract. The landscapes of the South and Southeast regions of Brazil are a mosaic of agroecosystems and vegetation in different stages of preservation, shapes and sizes and sizes and this changes the community structure of ants. Diversity of ants was compared in three different environments: orange orchard, lemon orchard and a forest fragment of the Brazilian Atlantic Forest biome, in the northwestern part of ...

Limited effects of low-intensity forest management on ant assemblages in southw...

One important strategy to conciliate forest conservation and economic development is the use of reduced-impact logging techniques. Here we evaluated the effects of low-intensity forest management on ant assemblages and vegetation structure in a managed area in the southeast of Acre State, Brazil. Ground-dwelling and arboreal ants, and several forest-structure descriptors were sampled in nine paired areas locate...

Temporal variation of vitellogenin synthesis in Ectatomma tuberculatum (Formici...

Workers of the ant species Ectatomma tuberculatum (Ectatomminae) have active ovaries and lay eggs that are eaten by the queen and larvae (trophic eggs). Vitellogenins are the main proteins found in the eggs of insects and are a source of nutrients. The aim of this study was to characterize the period of vitellogenin production in workers of E. tuberculatum. The vitellogenin was identified from queen and worker ...