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VOLVER A TABLA DE CONTENIDOS Volumen 45

NÚMERO 3

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Population genetic structure of the South American Bryde’s whale

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Operational interactions between the South American sea lion Otaria flavescens and purse seine fishing activities in northern Chile

ARTÍCULO

Annual cycle of phytoplankton with emphasis on potentially harmful species in oyster beds of Términos Lagoon, southeastern Gulf of Mexico

Autores

CORRESPONSAL

Andrés González

andres.gonzalez@ifop.cl

1

1

Departamento de Evaluación de Pesquerías, División de Investigación Pesquera Instituto de Fomento Pesquero, Blanco 839, Valparaíso, Chile

Rodrigo Vega

1

1

Departamento de Evaluación de Pesquerías, División de Investigación Pesquera Instituto de Fomento Pesquero, Blanco 839, Valparaíso, Chile

Eleuterio Yáñez

2

2

Escuela de Ciencias del Mar, Pontificia Universidad Católica de Valparaíso, P.O. Box 1020, Valparaíso, Chile

Resumen

To define the composition of the phytoplankton community, with an emphasis on harmful species, 6 stations were monitored monthly in the oyster beds of Términos Lagoon, SE Gulf of Mexico, from August 2012 to September 2013. Water temperature, salinity, hydrogen potential, oxygen saturation, inorganic nutrients and abundance of phytoplankton were determined. Temperature and salinity were characterized by marked seasonal differences. The pH values and the oxygen saturation suggest a predominance of photosynthetic activity. The phytoplankton community was characterized by the dominance of nanoflagellates and diatoms. The abundance and seasonal variation of phytoplankton showed minimum values (103 cells L-1) during the dry season (February-May) and high values (106 cells L-1) during the rainy season (June-September). Another significant feature of the phytoplankton community was the presence of the harmful dinoflagellate species Akashiwo sanguineaKarenia cf. mikimotoi,Pyrodinium bahamense var. bahamense, Prorocentrum mexicanum and P. minimum. The cyanobacteria Anabaenaand Cylindrospermopsis cuspis reached abundance of 1.9×106 and 1.3×106 cells L1, respectively. The generaAlexandrium and Pseudo-nitzschia were present, but the taxa were not identified to the species level. In conclusion, the phytoplankton community undergoes changes in both species composition and structure of the community during each climatic season, in response to environmental variation, which allows the development of the phytoplankton community according to the conditions.

Palabras clave

South American sea lion, Engraulis ringens, Multivariate ENSO Index, Purse seine

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