摘要：Se recolectaron ejemplares de los anfípodos de la especie Eurythenes gryllus en 2 localidades de la planicie abisal (~3 400 m) en el golfo de México con el objeto de evaluar si estos carroñeros se encuentran aislados en el mar marginal o presentan cierta conectividad por su conducta natatoria, desplazándose horizontalmente en las masas de agua que caracterizan la región. Las secuencias parciales del gen mitocondrial 16S rRNA que se obtuvieron de 2 individuos de E. gryllus mostraron diferencias ligeras al compararse con las secuencias de otros anfípodos de la misma especie procedentes de otras zonas del Atlántico (3.6 a 3.9%) y del Pacífico (4.0 a 4.1%), incrementándose (4.2 a 9.5%) al compararse con secuencias de organismos de aguas someras (
其他摘要：Amphipods of the species Eurythenes gryllus were collected at 2 locations on the abyssal plain (~3 400 m) of the Gulf of Mexico in order to test whether or not these scavenger amphipods are isolated in this peripheral sea or show connectivity by their predominant swimming behavior, moving horizontally along the abyssal water masses in the region. Partial sequences of the mitochondrial 16S rRNA gene from 2 individuals of E. gryllus were determined and showed small differences when compared to sequences of other amphipods of the same species from the Atlantic Ocean (3.6 to 3.9%) and Pacific Ocean (4.0 to 4.1%) and increasing (4.2 to 9.5%) when compared to sequences of specimens from sites of less than 500 m. The largest differences (18%) were observed when the sequences were compared to that of Eurythenes from the Tongue of the Ocean in spite of its closer geographical distance in the region. Isolation in the deep Gulf of Mexico could be attributed to limited genetic exchange with the western tropical Atlantic through the Caribbean over the 2 040 m deep sill and inexistent at abyssal depth through the Florida Straits.
关键词：Biología; Carcinología; Evolución;anfípodos; fauna de mar profundo; diversidad genética; asociaciones de carroñeros; Mar Intra Americano; canal de Yucatán
