RESUMEN

The natural areas of the Coastal Plain of Rio Grande do Sul (CPRS) have suffered fragmentation due to anthropic action. The faunal surveys offer a low-cost method to quickly evaluate environmental alterations, and Syrphidae flies are often used as models in this kind of study. We aimed to ascertain the diversity of Syrphidae in the South region of Brazil by estimating its species' richness, and to use this data to identify new areas for conservation. In this survey Malaise traps were installed for 8 days in the CPRS, which was divided into five regions. Each region was subdivided into seven collecting areas and each of those areas received four traps, totaling 140 traps. A total of 456 Syrphidae individuals from 18 genera and 49 species were collected. In Region 1, there were nine exclusive species; in Region 2, there were three; in Region 3, there were 13, ten of which came from Estação Ecológica do Taim (ESEC Taim). In the Individual-based rarefaction analysis, Region 1 possessed the largest number of expected species out of the regions in the CPRS; we found 97% of these species. This insect collection effort, as one of the first in the CPRS, has broadened the known geographic distributions of 11 species of Syrphidae, and also indicated areas to be conserved. Additionally, it gave support for expanding ESEC Taim and creating new areas of conservation in Region 1, in Arroio Pelotas and Arroio Corrientes.

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RESUMEN

The purpose of this study was to evaluate the survival, development time and morphological measures of immature Ophyra aenescens and Ophyra albuquerquei on different diets. Different proportions of protein and carbohydrates were offered for each species in 10 vials containing 30 eggs each. The vials were placed in a germination chamber at 30°C, relative humidity above 75 percent and photoperiod of 12 hours. Every day a vial was removed and mortality was evaluated and on the tenth day the length of the cephalic-pharyngeal skeleton (EC) and body size (G) of larvae that survived were evaluated. Survival was higher in diets with more protein (P<0.001). Between the species, mortality was more pronounced in O. albuquerquei in all diets (P<0.001). The EC (P<0.01) and G (P<0.01) showed the same sizes in the diets with higher protein content. For the production of pupae of these species, the diet with more protein and fewer components is more appropriate, and the production is higher in O. aenescens than in O. albuquerquei.

Avaliaram-se a sobrevivência, tempo de desenvolvimento e medidas morfológicas de imaturos de Ophyra aenescens e Ophyra albuquerquei em dietas compostas com diferentes proporções de proteínas e carboidratos. Estas dietas foram oferecidas para cada espécie em 10 frascos contendo 30 ovos cada que foram acondicionados em câmara de germinação a 30ºC, UR entre 75 por cento e 90 por cento, fotoperíodo de 12 horas. Para avaliação do padrão de sobrevivência, um frasco foi retirado da câmara diariamente e foi realizada contagem dos indivíduos vivos. No décimo dia foi avaliado o comprimento do esqueleto céfalo-faríngeo (EC) e o tamanho do corpo (G) das larvas que sobreviveram. O esqueleto céfalo-faríngeo (P<0,01) e o tamanho do corpo (P<0,01) apresentaram os mesmos tamanhos nas dietas com maior teor de proteínas, diferenciando-se nas outras dietas. O padrão de sobrevivência foi mais acentuado em O. albuquerquei do que em O. aenescens (P<0,001), enquanto nas dietas com mais proteínas a mortalidade foi menor que nas dietas com menos (P<0,001).

RESUMEN

Relata-se a ocorrência de Sarcopromusca pruna como vetor biológico de Dermatobia hominis no sul do Brasil. O díptero foi capturado em Janeiro de 2003 em armadilha Malaise, permanentemente instalada desde Julho de 2002, como parte de um estudo de diversidade de Muscoidea no bioma Campos Sulinos, extremo sul do Rio Grande do Sul. O espécime estava carreando 18 ovos de D. hominis na porção látero-ventral direita do abdome

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