Resumo A ocorrência de brotos estipulares em Marattiaceae tem sido observada por diferentes autores, geralmente sob condições de cultivo. Neste estudo, é descrito o desenvolvimento de brotos estipulares em uma população de Danaea nodosa localizada em uma Mata de Galeria no Cerrado brasileiro. De junho de 2006 a julho de 2007, 40 indivíduos foram monitorados e 13 destes apresentaram brotos estipulares. A formação dos brotos estipulares foi observada em agosto e setembro de 2006, período correspondente ao final da estação seca. Em dois destes indivíduos, os brotos estipulares evoluíram para esporófitos jovens. Uma visita adicional realizada em abril de 2008 revelou que estas plântulas continuaram a produzir novas frondes. Este estudo fornece uma importante informação sobre a estratégia de propagação vegetativa da espécie em condições naturais, o que pode orientar novas pesquisas com propósitos conservacionistas para samambaias nativas.

Abstract The occurrence of stipular buds is commonly observed in Marattiaceae under controlled conditions. In this study, is described the development of stipular buds in a population of Danaea nodosa located into a gallery forest of the Brazilian savanna. From June 2006 to July 2007 40 individuals were monitored and 13 of them presented stipular buds. The formation of stipular buds was observed in August and September 2006, a time corresponding to the end of the dry season. In only two individuals, the stipular buds evolved to ramets. An additional survey conducted in April 2008, revealed that the ramets continued to product new leaves. This study provides an important information about the reproductive strategy of the species under natural conditions, which can guide future researches with conservationist purposes to native ferns.

As larvas Myrmeleon brasiliensis constroem armadilhas em forma de funil no solo arenoso para a captura de suas presas, pequeños artrópodes, que se movem na superfície do solo. O objetivo deste trabalho foi observar através de experimentos de laboratório, o comportamento de deslocamento das larvas M. brasiliensis frente a variaçoes dos fatores alimento, perturbação da armadilha e densidade. Os resultados deste trabalho mostram que em um curto período de tempo os fatores densidade e perturbado afetam as larvas M. brasiliensis. Possivelmente as larvas deslocam-se na tentativa de encontrar um local mais favorável para a construcjlo de suas armadilhas, o que seria representado por um ambiente onde a interação intraespecífca é menor e livre da perturbação das armadilhas.

Myrmeleon brasiliensis larvae build funnel-shaped traps in sandy soil to catch their prey, small arthropods, which move on the soil surface. The objective of this study was to observe displacement behavior of the larvae M. brasiliensis due to variations in food availability, trap density and disturbance through laboratory experiments. These results show that in a short period of time, density and distubance afect M. brasiliensis larvae. Possibly, larvae move in an attempt to fnd a more favorable place for the construction of its pitfall traps, which would be represented by an environment where intraspecifc interaction is reduced and free from disturbance of traps.

The reproductive pattern of Elachistocleis bicolor (Guérin Méneville, 1838) was studied at Serra da Bodoquena, from October 2000 to September 2001. Reproduction occurred in the wet season (October to April) and was correlated to high continuous pluviometric precipitation. The species presents sexual size dimorphism, with females larger than males. The number of mature eggs per ovary was 620 ± 251 (n=39) and mature eggs measured 1.15 ± 0.30 mm (n=40). Elachistocleis bicolor presented significant relations between snout-vent length and number of mature eggs (n=39; r²=0.25; p=0.001), individual weight and number of mature eggs (n=41, r²=0.30; p=0.002), snout-vent length and ovarian weight (n=35; r²=0.47; p<0.01), and individual weight and ovarian weight (n=36; r²=0.55; p<0.01). Weight and volume are better to study size-fecundity relationships than snout-vent length. The females invested 22.7 ± 6.3 % (n=35) of their weights in reproduction and the variance associated to this variable was high, related to the reproductive mode of the species.

A diversified Lepidoptera fauna is found associated with Eucalyptus plantations in Brazil. From October 1990 to September 1991 twelve light traps were used in three regions of the Cerrado area with Eucalyptus plantations (Bom Despacho - BD, Três Marias - TM and Montes Claros - MC), in Minas Gerais State, Brazil. Twenty three Lepidoptera defoliator species were found in those regions. These species were affected by many factors, specially the plantation stage, the neighboring plant species, the type of brush vegetation and the species of Eucalyptus planted in a specific area. The saniples were not significantly different between regions in species richness (12 to 17 species; p=0.065) or eveness (0.53 to 0.70; p=0.779) in a randomized ANOVA test. Assuming a relation between the diversity and the vulnerability to pest outbreaks, it is sugested that the sampling points are equally vunerable. A cluster analysis revealed a clear separation between regions based in their species abundance and composition. In each region it is possible to show subsets of saniples fornied by the Eucalyptus species (MC) or the effect ofthe nearby regeneration áreas (TM). These differences suggest a species substitution process that do not alter the fixed community strueture shared by each region.