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Huang, Y., Ho, S. H., Lee, H. C., Yap, Y.L., 2002. Insecticidal properties of eugenol, isoeugenol and methyleugenol and their effect on nutrition of Sitophilus zeamais Motsch. ( Coleoptera: Curculionidae

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We studied a benthic invertebrate assemblage of a stream that passes through pristine, rural, suburban and urban areas of a municipality located in southeastern Brazil to investigate a possible relationship between this assemblage structure and urbanization. The environmental variables and fauna structure were analyzed in a spatial and temporal scale, sampling the four sites in a dry and wet season. We found a clear spatial pattern, with higher similarity between sites from rural and suburban area that presented intermediate environmental characteristics. The pristine site showed in both seasons the lowest values of alkalinity and fecal coliform. On the other hand, the site located in the urban area showed the lowest concentration of dissolved oxygen and higher of suspended solids, ammonia and fecal coliform. The extreme values of these three variables occurred in the wet season, probably related to the high rainfall values. The benthic invertebrate fauna structure followed the same longitudinal and seasonal pattern found for the environmental variables. The site in urban area showed the lowest richness, diversity and evenness, with a dominance of two groups resistant to adverse environmental conditions (Oligochaeta and Orthocladiinae) and absence of more sensitive groups (Coleoptera, Ephemeroptera and Trichoptera). The increase drag of the substrate and associated invertebrates can be responsible for the lower abundance and richness observed in the wet season. The environmental variables that best defined the differentiation between sites (dissolved oxygen, organic suspended solids and fecal coliform) related directly to urbanization effects, like dump effluents and removal of riparian vegetation.

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Summary  

Stable isotope markers have been used to study animal nutrition for several decades and more recently to study the foraging and cultural habits of imported fire ants. In this work, we have extended that effort to evaluate the potential for marking boll weevils, Anthonomus grandis grandis Boheman (Coleoptera: Curculionidae), with the rare earth element samarium to aid in studies of insect invasion and pest eradication protocols. Neutron activation analysis (NAA) was performed on the marked boll weevils as well as plant material from the cotton squares on which the insects were fed. Samarium levels in non-dosed insects average about 20 ng/g or about 100 pg total element per insect. Our computed average determination limit was 36 pg samarium/weevil. The determination limit for cotton plant squares and leaves averaged 3.5 ng/g and 8.2 ng/g, respectively. These initial results indicate the NAA method is capable of identifying individual marked insects which have assimilated 1 ng of samarium, a ten-fold increase in content over average blank values.

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Baca, F. (1993): New member of the harmful entomofauna of Yugoslavia Diabrotica virgifera virgifera LeConte (Coleoptera: Chrysomelidae). IWGO News Letter, Vol. XIII, (1-2), 21

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Bartelt, R. J., Seaton, K. L. and Dowd, P. F. (1993): Aggregation pheromone of Carpophilus antiquus (Coleoptera: Nitidulidae) and kairomonal use of C. lugubris pheromone by C. antiquus . J. of

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., Draganic, M., Baca, F. and Kaitovic, Z. (1994): Rasprostranjenost i stetnost Diabrotica virgifera virgifera LeConte (Coleoptera, Chrysomelidae) nove stetocine kukuruza u Jugoslaviji. Zastita bilja, Vol. 45, 19

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77 80 Asteraki, E.J., C.B. Hanks and R.O. Clements 1995. The influence of different types of grassland field margin on carabid beetle (Coleoptera, Carabidae) communities

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1409 1410 Davis, P.M. 1994. Comparison of economic injury levels for western corn rootworm (Coleoptera: Chrysomelidae) infesting silage and grain corn. J. Econ. Entomol. 87

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Literature Avand-Faghih , A. ( 1996 ): The biology of red palm weevil, Rhynchophorus ferrugineus Oliv . (Coleoptera: Curculionidae) in Saravan region (Sistan and Balouchistan Province, Iran). Appl. Entomol. and Phytopathol. 63 , 16

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Acta Phytopath. Entomol. Hung. 31 83 159 Hance, T. (1992): Spring densities of ground beetles (Coleoptera

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