7 documents found, page 1 of 1
Frequência de Bacillus spp. em solos de diferentes sistemas de cultivo de arroz...
Fritz,Leila Lucia; Berlitz,Diouneia Lisiane; Macedo,Vera Regina Mussoi; Machado,Vilmar; Fiuza,Lidia MarianaBacilos entomopatogênicos são bactérias observadas principalmente no solo, consideradas importantes agentes no controle biológico de doenças e pragas da agricultura. No entanto, existem poucos estudos que relatam a influência das práticas agrícolas nas populações de Bacillus spp. Essa pesquisa objetivou avaliar a freqüência de bactérias entomopatogênicas pertencentes ao gênero Bacillus obtidas de amostras de so...
Analysis of the geographical variation of elytral color polymorphisms in three ...
Machado,Vilmar; Valiati,Victor H.In the present report, we investigate polymorphism in three of the Brazilian species of Chauliognathus Hentz, 1930 (Coleoptera, Cantharidae), by analyzing the geographical color pattern variation of the elytra in C. flavipes, C. fallax and C. octomaculatus. These species belong to the mullerian complex called the "yellow-black". They are usually found in clusters on their host plants at various locations and pr...
Phylogenetic relationships and the evolution of mimicry in the Chauliognathus y...
Machado,Vilmar; Araujo,Aldo M.; Serrano,José; Galián,JoséThe phylogenetic relationships of twelve species of Chauliognathus were investigated by studying the mitochondrial cytochrome oxidase I gene. A 678 bp fragment of the COI gene was sequenced to test the hypothesis that the Müllerian mimicry species of the "yellow-black" complex make up a monophyletic clade, separated from species with other colour patterns. The data set was analysed by neighbour-joining, maximum...
Elytra colour polymorphism and randomness of matings in Chauliognathus fallax G...
Machado,Vilmar; Araújo,Aldo Mellender deBeetles of the species Chauliognathus fallax Germar 1824 are polymorphic for elytron colouration with six morphs distinguished on the basis of black pigmentation on a yellow background. We investigated samples of C. fallax taken in eight consecutive weeks aiming to determine the frequency of the morphs which were grouped, for statistical analysis, into three classes according to elytra pigmentation as well as t...
Morphometric analysis, mimicry, and color polymorphism in five species of Chaul...
Machado,Vilmar; Araújo,Aldo M. de; Mosmann,Cleri S.This study presents data on morphometric variation for length and width of elytra in tive sympatric species of the genus Chauliognathus Hentz, 1830: C. flavipes Fabricius, 1781, C. octomaculatus Pie, 1915, C. expansus Waterhouse, 1878, C. fallax Germar, 1824 and C. lineatus Zwetsch & Machado, 2000. The meaning of this variation is discussed in the light of the theory of mimicry and visual communication betw...
The aggregation of Chauliognathus species (Coleoptera, Cantharidae) and its pos...
Machado,Vilmar; Araújo,Aldo Mellender deThe relative population sizes of a species complex of Chauliognathus are reported, as well as their spatial distribution associated with different patches of food plants. Field work was done at Fazenda Santa Isabel, municipality of Guaíba, State of Rio Grande do Sul, Brazil. The results suggest that two mechanisms account for the reduction in food competition among the species involved: one is asynchrony in the...
Color polymorphism in Chauliognathus flavipes Fabricius (Coleoptera, Cantharida...
Machado,Vilmar; Araújo,Aldo Mellender deThis study presents data on the color polymorphism in Chauliognathus flavipes Fabricius 1781 (Coleoptera, Cantharidae), analysing the variations in the emergence pattern of phenotypic classes for elytra color and mating system. The frequency of the phenotypic classes varies significantly throughout the season (males:X² = 59,705; females: X² = 61,017; 10 gl; p<0.001) being similar in males and females. The frequ...