COMPOSICION ESPECIFICA, ECOLOGIA y SINANTROPIA DE
CALLlPHORIDAE (INSECTA: DIPTERA) EN EL GRAN BUENOS AIRE

Juan A. SCHNACK, Juan C. MARILUIS, Néstor CENTENO, Javier MUZON

Abstract


Diptera Calliphoridae flies from three sampling sites in the same geografic location but differing in their degree of synanthropy were simultaneously sampled at aproximately monthly intervals, from February 1992 to February 1993, in Llavallol (Lomas de Zamora Distriet,
Province of Buenos Aires, Argentina) (340 45'S, 58" 25'W). Speciec eomposition, abundance, synanthropy and diversity, as well as sex ratio, were the main analyzed traits. Twelve species were recorded. From the total number of captures within the whole sampling area Cochliomyia macellaria and Phaenicia sericata were the most abundant while Sarconesia chlorogaster exhibited the lowest figures. Nevertheless, species relative abundance changed in accordance with the sampling chosen sites. Overall abundance was positively and significantly
correlated to temperature (r == 0.936, P < 0.001, Df == 7). Species diversity was not strongly affected by urbanization, but averaged indices are somewhat higher at asynanthropy. Based upon the chi-square test, sex ratio was estimated as female biased (P < 0.01) in a11 species except S. chlorogaster (male biased) and Calliphora nigribasis (sex ratio == 1). Phaenicia cuprina, P. sericata,C. macellaria, and Chrysomva albiceps showed preference for the human sampling section in opposition to Phaenicia cluvia, Paralucilia pseudolyrcea, C. nigribasis, and Calliphora
vicina, mostly captured in the wild.

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