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International Journal of Zoology
Volume 2011, Article ID 248790, 6 pages
Research Article

Effects of Different Salinities on Juvenile Growth of Gammarus aequicauda (Malacostraca: Amphipoda)

1Institut de Recerca de la Biodiversitat (IRBio) y Departament de Biologia Animal, Universitat de Barcelona, Avinguda Diagonal 645, 08028 Barcelona, Spain
2IRTA, Unitat de Cultius Aquàtics (UCA), 43540 Sant Carles de la Ràpita, Tarragona, Spain

Received 8 March 2011; Accepted 14 April 2011

Academic Editor: Chris Lloyd Mills

Copyright © 2011 Lídia Delgado et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Gammarus aequicauda is a euryhaline amphipod that is a common inhabitant of brackish environments of the Mediterranean Sea. In the Ebro delta, the population density of G. aequicauda is highly variable throughout the year. The main objective of this study is to investigate the effect of salinity on the growth of G. aequicauda juveniles. G. aequicauda embryos and juveniles can survive and grow in the laboratory between 2 psu and 40 psu salinity, depending on the previous acclimation period for the reproductive individuals. Adults acclimated at 34 psu produced embryos and juveniles that survived and developed at salinities between 9 psu and 40 psu; adults acclimated at 9 psu produced embryos and juveniles that could develop in oligohaline conditions. The lower growth rate values were 10.9 μm d−1 and 13.5 μm d−1 at 40 psu and 2 psu, respectively, with the higher values of 18.0 μm d−1 and 18.5 μm d−1 at 19 and 34 psu, respectively.