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Volume 41 - Number 2 - 2006

Seasonal abundance and spatial distribution of Mysidacea in Southern West Atlantic, Bahía Blanca Estuary (38º42’- 39º26’S and 62º28’- 61º40’W)

Natalia V. Cardelli1, Patricia M. Cervellini1 y María C. Piccolo2 

1 Departamento de Biología, Bioquímica y Farmacia, Universidad Nacional del Sur, San Juan 670, (8000) Bahía Blanca, Argentina
2 Instituto Argentino de Oceanografía, C.C. 804, Camino la Carrindanga Km 7,(8000) Bahía Blanca, Argentina



Two mysids species were present in the Bahia Blanca estuary: Arthromysis magellanica (Cunningham) and Neomysis americana (Smith). They were present in the estuary from August to March. The abundance ofA. magellanica was highest, 31.92 ind.m-3 in spring and N. americana abundance reached a maximum of 10.91 ind.m-3 during midsummer. These high abundance values were coincident with the increment of the water temperature. The mean temperature value registered during the sampled period was 15.7°C. Both species were present from 10°C to 23.3°C and were absent from 6.6°C to 22°C.

In agreement with the spatial distribution of both species, a relationship in the abundance of A. magellanica for the three sampling stations was not detected (ANOVA, n=8, P> 0.80) but there was a relationship in the abundance of N. americana for the three sampling stations (ANOVA, n=10, P<0.05) since the highest density of this species was recorded in the inner zone of the estuary.

Significant differences in salinity were found between the three sampling stations for those dates when N. americana was present (ANOVA, n=10, P<0.05) but it could not be demonstrated that this variable is related with the spatial distribution of this species in the estuary (covariable, P>0.15). 

Key words: Crustacea, species, number of individuals, distribution, Argentina



1Laboratorio de Zooplancton, Instituto de Ciencias del Mar y Limnología,Universidad Nacional Autónoma de México. A. P. 70-305, 04510 México, D. F. México
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