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We conducted a research on some community components and infracommunities of parasite fauna of American cockroach, P americana, on one hundred specimens collected from the sewage of the district of Pueblo Libre, Lima-Perú, between August and September 1996. Of the cockroachs collected 67 were male and 33 female, 19 were adults and 81 early instars. The cockroachs were necropsied and we found five parasites with prevalence and intensity of infection as follows: Cephalobellus tipulae (Nematode) (38%, 3,5), Leidynema appendiculatum (Nematode) (35% y 2,85), Thelastorna bulhoesi (Nematode) (1% y 7), Moniliformes moniliformes (Acanthocephala) (2% y 1,5), and Pimeliaphilus cunliffei (Acarina) (62% y 5,03). P cunliffel was considered a core species; C. tipulae and L. appendiculatum were secondary species and M. moniliformis and 7 bulhoesi were satellite species. C. tipulae and L. appendiculatum...

We conducted a research on some community components and infracommunities of parasite fauna of American cockroach, P americana, on one hundred specimens collected from the sewage of the district of Pueblo Libre, Lima-Perú, between August and September 1996. Of the cockroachs collected 67 were male and 33 female, 19 were adults and 81 early instars. The cockroachs were necropsied and we found five parasites with prevalence and intensity of infection as follows: Cephalobellus tipulae (Nematode) (38%, 3,5), Leidynema appendiculatum (Nematode) (35% y 2,85), Thelastorna bulhoesi (Nematode) (1% y 7), Moniliformes moniliformes (Acanthocephala) (2% y 1,5), and Pimeliaphilus cunliffei (Acarina) (62% y 5,03). P cunliffel was considered a core species; C. tipulae and L. appendiculatum were secondary species and M. moniliformis and 7 bulhoesi were satellite species. C. tipulae and L. appendiculatum...

En el Perú, las microalgas marinas Isochrysis galbana Parke y Chaetoceros gracilis Schütt, son utilizadas como alimentos de varias especies zoológicas de la cadena trófica marina; a su vez en condiciones de cultivo evita la utilización de la levadura de panificación, disminuyendo la acidificación del medio de cultivo y evitando así perjudicar a la acuicultura marina. El cromo es un contaminante de importancia antropogénica en el ecosistema acuático. En este trabajo se analiza el efecto del Cr+6 bajo la forma de K2Cr2O7 en las microbiopruebas de ecotoxicidad de inhibición con las microalgas marinas, I. galbana y C. gracilis usando un estimador de crecimiento poblacional específico para cuantificar la respuesta de toxicidad. Se realizó el bioensayo teniendo como resultado el análisis de sensibilidad al K2Cr2O7, productividad, costoeficiencia y su aplicación potencia...