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[en] The radioactivities of beta rays of the caught shrimps at the coastal area in Inchon are investigated. The samples of the shrimps were taken randomly on the six places for three months period for two years. The overall average radioactivity is 21.9x10-2 pci/gr. Especially the radioactivity of one of the places is 29.6x10-2 pci/gr and this is the most highest value, However, this value is lower than the values of fishes and sea weeds of the places. Therefore, the radioactivity of caught shrimps in this area are almost he level of the natural radioactivities and the results of the study seem not contaminated of the fallout. (Author)
[en] Variation of environmental parameters and copepods population were studied in the Oum Er Rbia estuary (Atlantic - Moroccan coast) according to the seasons, ( August 1995 to August 1997), tides and reservoir release events. Environemental variability influences copepods diversity and abundance. Salinity (5 to 20 g l-1) appears as the main controlling factor. Among the 27 copepod species recorded, only three marine species (Oithona helgolandica, Euterpina acutifrons, Acartia clausi) and one freshwater species (Acanthocyclops robustus) are able to maintain significant populations due to their large degree of tolerance to salinity changes. (author)
[en] The study of zooplankton in the coastal zone is fundamental to understand ecological processes. The coastal zone Arapito - Santa Fe, located in the Mochima National Park, Sucre state, Venezuela, is considered an area of great natural importance and therefore the study on zooplankton was carried upon. For this reason, the composition and community structure of zooplankton were determined in 20 stations, separated in a) coastal stations and b) away from the coast during December 2008. Samples were collected obliquely by dragging a Bongo net (500 and 300 ?m, with a flow meter). The community was characterized by the presence of holoplanktonic organisms and a lower proportion of meroplankton. The main holoplankton groups were cladocerans, copepods and gelatinous plankton (appendiculate, siphonophores and hydromedusae). The most abundant species were the cladocerans Penilia avirostris and Pseudevadne tergestina and the copepods Acartia tonsa and Temora turbinata. The high percentage of holoplankton in the study area let it to be considered as a growth and feeding zone. The AMOSIM-MDS showed significant differences (p p <0.05) between the two environments with R = 0.27 but with low dissimilarity (17.4%), which suggests that mixing processes promote homogeneous distribution of zooplankton in the study area.