Indigenous inhabitants of the Baja California peninsula used littoral and marine resources for food and raw materials from the Holocene through the Spanish Colonial and Mission period. This study analyzes faunal assemblages from seven archaeological sites in the Bajamar-Jatay area spanning similar to 4,800 years to examine coastal foraging strategies during periods of cultural transition and environmental variability. Subsistence practices focused on harvesting mollusks, particularly larger species from upper and middle intertidal zones-such as black abalone, California mussel, and owl limpet-along with smaller aggregated species like turban snails. Nearshore fishing occurred but remained supplementary. Results indicate relative stability in harvested intertidal mollusks, with shell densities and ecological indices oscillating through time. These findings suggest localized adaptive strategies and sustained intertidal resource management within rocky boulder intertidal and subtidal habitats. There is no clear evidence that environmental shifts significantly affected local shellbeds. Los habitantes ind & iacute;genas de la pen & iacute;nsula de Baja California utilizaron recursos litorales y marinos para la alimentaci & oacute;n y la obtenci & oacute;n de materias primas desde el Holoceno hasta el periodo Colonial y Misional. Este estudio analiza conjuntos faun & iacute;sticos de siete sitios arqueol & oacute;gicos en la regi & oacute;n de Bajamar-Jatay (similar to 4,800 a & ntilde;os) para examinar estrategias de aprovechamiento costero en contextos de transici & oacute;n cultural y variabilidad ambiental. La subsistencia se centr & oacute; en la recolecci & oacute;n de moluscos, especialmente especies del intermareal superior y medio, como el abul & oacute;n negro, el mejill & oacute;n de California y la lapa gigante, as & iacute; como especies agregadas de menor tama & ntilde;o, como los caracoles turbante. La pesca en zonas someras fue complementaria. Los resultados indican estabilidad en los moluscos explotados, con densidades de concha e & iacute;ndices ecol & oacute;gicos que fluct & uacute;an a lo largo del tiempo, lo que sugiere estrategias adaptativas y manejo sostenido de recursos intermareales, sin evidencia clara de impactos significativos por cambios ambientales.
