Organochlorinated compounds, seven indicator PCB congeners, DDT and its main metabolites, were determined in sediment and crab (Chasmagnathus granulata) samples collected from mangrove areas near Rio de Janeiro, Brazil. Samples were analysed according to the FAO/SIDA protocols using continuous non-polar solvent extraction and a conventional GC-ECD apparatus. The highest levels of total PCB congeners and total DDT metabolites in sediments (184.16 and 37.40 ng.g −1 d.w. respectively) and crab eggs (570.62 and 98.22 ng.g −1 d.w. respectively) were found at impacted mangroves. The higher PCB congeners than DDT metabolites levels suggesting a stronger industrial impact in this area. The results indicate that the population density of crab is negatively affected by sediment contamination that is reflected basically by the organochlorine content in the female eggs. The organochlorine concentration in eggs is more significant to evaluate or estimate an impact of these pollutants upon C. granulata population than the organochlorine concentration in sediment samples.

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The effects of industrial anthropization on species composition and community diversity of Culicidae (Diptera) were studied in a mangrove area impacted by industrial activities as compared to a preserved area, both around Guanabara Bay in the state of Rio de Janeiro, Brazil. Diversity, equitability, and species richness in Culicidae community differed between the studied areas. Indicator species analysis and correspondence analysis were carried out and indicated that the Sabethini, especially Wyeomyia (Phoniomyia) theobaldi Lane, Wyeomyia (Phoniomyia) fuscipes (Edwards), and a non-identified species of Wyeomyia sp. were associated to the preserved area, whereas Aedes taeniorhynchus Wiedemann and Aedes scapularis (Rondani) to the impacted area.

ABSTRACT. Mosquitos (Diptera, Culicidae) of Pendotiba and oceanic regions of Nite.,ói (Rio de Janeiro, Brazil). Female mosquitoes (Culicidae) were collecled in human bait weekly between March 1997 to February 1998 A statistical analysis between monthly female frequencies and temperature, air humidity and precipitation monthly indices was done, using Sperman correlation in Statistica 4.2 programo The only difference among the collected poinls is lhe higher number of species collected in Engenho do MaIo, in spite of lhe differences between them in relation lO vegeta l formation and conservation. The species showed higher frequencies of females during spring and summer seasons, and permil us to conclude that lemperalure and precipilation demonslraled high leveis of correlation to female frequencies along lhe one year study, but the same was not observed in relation to air humidity. Some of the identified species, such as Aedes aegyp/i, A. a/bopictus, A. scapu/aris, Haemagogus /eucoce/aenus and Cu/ex quinquefasciatus are important as disease vectors and control suggeslions are made in front of lhe relative abundance ofthem in different periods oflhe year. KEY WORDS . Diptera, Culicidae, ecology, Niterói, Rio de Janeiro o Município de Niterói, no Estado do Rio de Janeiro, vem experimentando, desde a década de 80, um acelerado crescimento populacional e econômico, devido não só ao crescimento autóctone, mas também à imigração proveniente do interior do Estado e de outros Municípios da Região Metropolitana do Rio de Janeiro. Esta imigração deve-se aos desequilíbrios na política de desenvolvimento regional, que faz com que o interior fique em desvantagem no processo de evolução econômica e ocasiona crise imobiliária na região metropolitana, resultante do fluxo do contingente humano. A falta de espaço residencial nas áreas mais tradicionais do municí-pio, bem como de outros municípios incluindo a própria capital (Rio de Janeiro),