Navegando por Autor "Alonso, Jatnel"

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Diversity of Hemiptera (Arthropoda: Insecta) and their natural enemies on Caryocar brasiliense (Malpighiales: Caryocaraceae) trees in the Brazilian Cerrado
(Florida Entomologist, 2016) Leite, Germano Leão Demolin; Veloso, Ronnie Von dos Santos; Zanuncio, José Cola; Alonso, Jatnel; Ferreira, Paulo Sérgio Fiuza; Almeida, Chrystian Iezid Maia; Fernandes, Geraldo Wilson; Serrão, José Eduardo
The Cerrado occupies about 23% of the Brazilian territory and is characterized by great diversity of plants and insects and a great degree of endemism, and Caryocar brasiliense A. St.-Hil. (Malpighiales: Caryocaraceae) is widely distributed in this region. The diversity and abundance of hemipterans and their natural enemies were studied on trees of C. brasiliense in the Cerrado, pasture, and anthropic area in Montes Claros, Minas Gerais State, Brazil. We observed 1 rare, 8 common, and 1 frequent species of sucking insects; and 2 rare, 7 common, and 6 frequent species of natural enemies. Sucking insects and their natural enemies were most abundant in the pasture and least abundant in the Cerrado. Increasing diversity indices and numbers of species and individuals of sucking insects were followed by similar trends in the populations of natural enemies. Increasing populations of sucking insects led to greater numbers of individuals of ants, green lacewings, predator thrips, and ladybeetles. Aluminum level positively affected the number of species and individuals, and the pH of the soil reduced those of sucking insects. Leafhoppers had greater numbers on plants on soils with low pH values and high aluminum levels, but the opposite was noted for the aphids.
Seasonal abundance of hemipterans on Caryocar brasiliense (Malpighiales: Caryocaraceae) trees in the cerrado
(Florida Entomologist, 2012-12) Leite, Germano Leão Demolin; Zanuncio, José Cola; Fernandes, Geraldo Wilson; Almeida, Chrystian Iezid Maia; Ferreira, Paulo Sérgio Fiúza; Alonso, Jatnel; Serrão, José Eduardo; Veloso, Ronnie Von dos Santos
Caryocar brasiliense Camb. (Malpighiales: Caryocaraceae) trees have a wide distribution in the cerrado. This plant is protected by federal laws and is untouched in deforested areas of the cerrado. Under these circumstances, the damage to leaves, flowers, and fruits from sucking hemipterans has increased. We studied populations of sucking insects and their predators on C. brasiliense trees in the cerrado during each season for 3 successive years. The numbers of sucking insect individuals on C. brasiliense trees were similar among the seasons of the year. However, the highest number of species and greatest diversity occurred in winter. Predators were most abundant in spring and winter, with highest diversity and number of species in winter. We observed 7 rare, 2 common, and 1 constant species of sucking insects; and 4 rare, 8 common, and 1 constant species of predators on C. brasiliense trees. The greatest numbers of various sucking insect species were observed by seasons as follows: Aconophora sp. (Membracidae) on fruits and Frequenamia sp. (Cicadellidae) on leaves in the winter; Aphis gossypii (Glover) (Aphididae) and Mahanarva sp. (Cercopidae) in the spring; and Dikrella sp. (Hemiptera: Cicadellidae) on the leaves in the summer and autumn. For predators, Crematogaster sp. (Hymenoptera: Formicidae) had the lowest abundance on the leaves in the summer, and highest abundance in the flowers in the winter and spring, while in spring it was most abundant on the fruits, and in the autumn Trybonia sp. (Thysanoptera: Phlaeothripidae) on the leaves was the most abundant. Higher number of ants Crematogaster sp. was observed in Caryocar brasiliense trees that presented large numbers of Dikrella sp.. Higher numbers of predators Trybonia sp., Chrysoperla sp. (Neuroptera: Chrysopidae), and total of predator thrips were associated with decreasing numbers of Dikrella sp., A. gossypii, and total of sucking insects respectively. The increase in the numbers of individuals and species of predators were correlated with the reduction of these same ecological parameters of the sucking insects. We argue that this differential temporal distribution of sucking insects and their predators was influenced for phenology of plant and weather.