Introduction: the current study pretends: to analyze the use of Primary Health Care Services by the immigrant population under 15 years of age in comparison to the Spanish population of the same age group; and to analyze differences in the frequentation according to different origins of the immigrant population. Material and methods: this is an observational retrospective study including all consultations of children under 15 years of age to 26 health centers in Zaragoza, Spain, during the year 2007. The main variable, frequentation, was defined as total number of visits/year. Secondary variables were the type of attention that was requested and region of origin of the. The information about the number and type of visits was obtained from the agenda in the electronic data base ("OMI©: oficina médica informatizada") of the health centers. The frequentation was adjusted according to age and sex. Results: A total of 547,524 pediatric appointments in a population of 71,114 children (of which 10.87% were immigrants) were analyzed. The adjusted annual frequency of visits in autochthonous children was 8.05 while this frequency was 5.66 in immigrant children. Among immigrant children, the highest annual frequentation (6.15) was seen among children from Sub-Saharan Africa and the lowest frequentation (4.02) was seen in children from Asia. This lower frequentation among immigrant children was seen in all types of attention (visits on request, programmed visits, emergency visits and home visits) and was independent of the opening hours of the different health centers (only morning or morning and afternoon). Conclusions: the immigrant children's population shows a lower use of the public primary health care than the autochthonous population of the same age group, independent of the region of origin.

Introducción: el presente estudio pretende: 1) analizar el uso de los servicios de Atención Primaria de la población infantil inmigrante en relación con la española, y 2) analizar las diferencias existentes en esta frecuentación según la distinta procedencia. Material y métodos: se trata de un estudio observacional retrospectivo de todas las consultas a menores de 15 años llevadas a cabo el año 2007, en 26 centros de salud de Zaragoza. La variable principal, la frecuentación, se definió como el número total de visitas/año. La variable secundaria fue el tipo de atención solicitada. La información sobre los datos de las visitas se obtuvieron a partir de la agenda de la historia clínica electrónica (OMI©: oficina médica informatizada) de los centros de salud. Las tasas de frecuentación se ajustaron por edad y sexo. Resultados: se analizaron un total de 547 524 citas pediátricas sobre una población de 71 114 niños (el 10,87% eran inmigrantes). La frecuencia anual ajustada de visitas en los niños autóctonos fue de 8,05 frente a la de inmigrantes, que fue de 5,66. Dentro de los niños inmigrantes, la mayor frecuentación (6,15) se da en los niños procedentes del África subsahariana, y la menor en los de Asia (4,02). La menor frecuentación se da en todos los tipos de asistencia (demanda, programada, atención continuada y domicilios), independientemente de que los equipos sean de mañana o de mañana y tarde. Conclusiones: la población infantil inmigrante (en todas sus procedencias) hace un menor de uso las consultas de Atención Primaria que la población autóctona.

A distribuição espacial e temporal da densidade e biomassa dos copépodos planctônicos Pseudodiaptomus richardi e P. acutus, ao longo de um gradiente de salinidade, foi estudada no Estuário do Rio Caeté (Norte do Brasil) durante os meses de junho e dezembro de 1998 (estação seca) e fevereiro e maio de 1999 (estação chuvosa). A biomassa dos copépodos foi estimada a partir de parâmetros da regressão baseada na relação entre o peso seco e o comprimento do corpo (prossoma) de organismos adultos. O Estuário do Rio Caeté caracterizou-se por uma grande variação espacial e sazonal na salinidade (0,8-37,2‰). A relação peso-comprimento para ambas as espécies de Pseudodiaptomus foi do tipo exponencial. Os valores de densidade e biomassa oscilaram entre 0,28-46,18 ind. m-3 e 0,0022-0,3507 mg DW. m-3 para P. richardi; e entre 0,01-17,02 ind. m-3 e 0,0005-0,7181 mg DW. m-3 para P. acutus. Os resultados revelaram que a contribuição de P. richardi para a produção secundária no Estuário do Rio Caeté é mais importante na zona liminética que em outras zonas onde foram dominantes os regimes eurihalino-polihalino. Contudo, para P. acutus não foi possível observar de forma clara um padrão de distribuição espacial e temporal para a área estudada.

Spatial and temporal density and biomass distribution of the planktonic copepods Pseudodiaptomus richardi and P. acutus along a salinity gradient were investigated in the Caeté River Estuary (North-Brazil) in June and December, 1998 (dry season) and in February and May, 1999 (rainy season). Copepod biomass was estimated using regression parameters based on the relation of dry weight and body length (prosome) of adult organisms. The Caeté River Estuary was characterized by high spatial and temporal variations in salinity (0.8-37.2‰). Exponential length-weight relationships were observed for both Pseudodiaptomus species. Density and biomass values oscillated between 0.28-46.18 ind. m-3 and 0.0022-0.3507 mg DW. m-3 for P. richardi; and between 0.01-17.02 ind. m-3 and 0.0005-0.7181 mg DW. m-3 for P. acutus. The results showed that the contribution of P. richardi for the secondary production in the Caeté River Estuary is more important in the limnetic zone than in other zones where euhaline-polyhaline regimes were predominant. However, it was not possible to observe a clear pattern of spatial and temporal distribution for P. acutus.