Resumen del producto

In Mexico, there is little information about symbiotic associations among dinoflagellates and diatoms on marine planktonic crustacean. In this study, we report some cases of copepods infected by marine dinoflagellates. Samples were collected with a 20-!m mesh net in Bahía de La Paz (off PEMEX and Cuenca Alfonso), Bahía Magdalena, and offshore of San José del Cabo, Baja California Sur, Mexico from 2009 through 2010. We found several copepods species infected by the dinoflagellate Blastodinium spp. The copepod Paracalanus cf parvus was parasitized by Blastodinium contortum in samples from the three collection areas. B. contortum was previously reported Petróleos Dock in Bahía de La Paz, however, this is the first record for Cuenca Alfonso There are no previous records of B. contortum in the plankton of Bahía Magdalena and offshore of San José del Cabo, which is an extension of the range of this species. Blastodinium oviforme infected females of the cyclopoid copepods Oithona plumifera in samples from Bahía de La Paz and San José del Cabo. This is the first report of a host-parasite association in Mexican waters. Other copepods infected by Blastodinium spp. were Acartia sp. and Oncaea sp. Infection by Blastodinium spp. is not typically lethal, but does have a negative effect on fitness of the host.

Palabras clave: copepods; parasitic dinoflagellates; Blastodinium

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