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espanolLos comportamientos demograficos estan experimentando una creciente segmentacion en el interior de las regiones metropolitanas. Por ejemplo, los municipios de la Region Metropolitana de Barcelona (RMB) presentan diferentes intensidades de fecundidad, valores que incluso difieren en mayor grado que entre las provincias espanolas. La principal hipotesis de este trabajo es que dichas diferencias se sustentan en la migracion interna de parejas jovenes ligadas al ciclo de vida, aunque la presencia de poblacion extranjera o la renta media de los municipios tambien podrian influir. Para verificar estas hipotesis se ha calculado los indices sinteticos de fecundidad de 26 sub-areas de la RMB, complementandose este analisis descriptivo con modelos de regresion lineal para los anos 2001 y 2009. Los resultados confirman parcialmente la hipotesis principal, aunque en 2009 la complejidad residencial producto de la inmigracion internacional anade la presencia de extranjeros (africanos especialmente) como factor explicativo de los altos niveles de fecundidad. EnglishDemographic behaviour within metropolitan areas is increasingly spatially segmented, and fertility is a good example of this, as its growing spatial differences would depend on the type of metropolitan municipality analysed. The article's main hypothesis is that fertility level differences would mainly be explained by selective internal migration flows associated to young couples' life cycle. Alternative hypotheses are that fertility differences between municipalities could be explained by the share of foreign women living in them, o by disposable household income differences. In order to verify these hypotheses, the article analyses Barcelona Metropolitan Region's intra-metropolitan fertility. A preliminary descriptive analysis -total fertility rates (TFR) for 26 metropolitan subareas have been calculated- is completed by linear regression models for years 2001 and 2009. Results confirm that fertility differences are partly explained by young Spanish couples' internal migration flows towards small and medium suburban localities, but also by specific foreign groups, particularly Africans.

Causas de las desigualdades territoriales en la fecundidad: un estudio a escala metropolitana en el área barcelonesa