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COPEPOD ASSEMBLAGES IN THE GULF OF TEHUANTEPEC, MEXICO

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The Gulf of Tehuantepec, in the Mexican waters of the eastern tropical Pacific, is a very productive area with a high biological complexity, as the result of a wind-induced upwelling that occurs from November to February. The main assemblages of pelagic copepods in this region were identified and analysed in this study, during the final stage of the upwelling process. Samples were collected in oblique plankton hauls using a station grid that covered neritic and oceanic waters. Copepods were separated taking 10 ml aliquots from each sample. Data of copepod abundance were expressed as ind. m-3 and subjected to a Factor Correspondence Analysis, in order to determine the main copepod assemblages. Results indicate the presence of two main assemblages: neritic and oceanic. The neritic assemblage is located on shelf waters. Its characteristic species are Microsetella norvergica, Macrosetella gracilis, Nannocalanus minor, Centropages furcatus, Corycaeus speciosus, and Eucalanus subcrassus. The oceanic assemblage includes Copilia vitrea, Eucalanus inermis, Scolecithricella abyssalis, Haloptilus spp., and Rhincalanus spp. The composition of these assemblages corresponds to the physiography of the area, and this strong variation gradient from the coast to the ocean has been commonly observed in other assemblages of planktonic organisms as well.

El Golfo de Tehuantepec, en aguas mexicanas del Pacífico Oriental Tropical, es una zona muy productiva y de alta complejidad biológica, debido a una surgencia eólica que ocurre de noviembre a febrero. En este trabajo, se identificaron y analizaron las principales asociaciones de copépodos pelágicos en esta región durante la etapa final del proceso de surgencia. Los muestreos fueron realizados mediante arrastres oblicuos en una red de estaciones que cubrió aguas neríticas y oceánicas. Los copépodos fueron separados de cada muestra a partir de alícuotas de 10 ml. Los datos de abundancia de copépodos fueron expresados como ind. m-3 y tratados por medio del Análisis Factorial de Correspondencias, a fin de determinar las principales asociaciones de copépodos. Los resultados indican la presencia de dos asociaciones principales: nerítica y oceánica. La asociación nerítica se localiza sobre aguas de la plataforma continental. Sus especies características son Microsetella norvergica, Macrosetella gracilis, Nannocalanus minor, Centropages furcatus, Corycaeus speciosus y Eucalanus subcrassus. La asociación océanica tiene como especies características a Copilia vitrea, Eucalanus inermis, Scolecithricella abyssalis, Haloptilus spp. y Rhincalanus spp. La composición de estas asociaciones corresponde con la fisiografía de la zona, y el fuerte gradiente de variación en dirección costa-océano es comúnmente observado en otras asociaciones de organismos planctónicos.

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/content/journals/10.1163/156854000505137
2000-11-01
2015-08-28

Affiliations: 1: Laboratorio de Invertebrados, Facultad de Ciencias, Universidad Nacional Autónoma de México, Apdo. Postal 70-371, Mexico 04510 D.F., Mexico; 2: Unidad de Investigación en Ecología Marina, Facultad de Estudios Superiores Zaragoza, Universidad Nacional Autónoma de México, Apdo. Postal 9-020, Mexico 15000 D.F., Mexico; 3: Laboratorio de Invertebrados, Facultad de Ciencias, Universidad Nacional Autónoma de México, Apdo. Postal 70-371, Mexico 04510 D.F., Mexico

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