Juniper Publishers-Oceanography Open Access Journal

  Juniper Publishers -  Journal of Oceanography Abstract The abundance and community composition of zooplankton is spatially and temporally variable so it requires sampling over space and time. Quantitative assessment of biomass, community composition, and abundance is sensitive for sampling methodology, including the location and seasonal timing of sampling, as well as mesh size and gear type. Therefore, repeated and consistent sampling is essential to determine the changes in zooplankton distribution, abundance, community composition and seasonal timing at time scales that have impacts on higher trophic levels. In the present study, El-Mex Bay is highly diversified (204 forms) but low standing crop (annual average 8935 organisms/m 3 ). Using GIS and the other mapping applications give an easy and clear image about the distribution of aquatic fauna especially microscopic forms which help in understanding the dynamic of biological ecosystem. Go to Introduction Zooplankton spec...

  Juniper Publishers -  Journal of Oceanography Opinion Different climate models have concluded that the average global temperature has increased in the last century [ 1 ]. This change in global temperature has influenced climate conditions worldwide affecting population dynamics (e.g. phytoplankton communities) in ecosystems in different ways [ 1 - 3 ]. In terms of aquatic ecosystems, evidence has shown that some photo synthetic microorganisms may adapt and thrive successfully under warmer climatic conditions, while other cannot [ 4 ]. The toxigenic cyanobacterium  Microcystis aeruginosa  (Kutzing) Kutzing 1846 is a gram-negative photosynthetic prokaryote adapted to a wide range of environmental conditions in mesotrophic and eutrophic aquatic ecosystems [ 5 ]. The main family of toxins synthetized by  M. aeruginosa  are microcystins (hepatotoxins); in nature, more than 90 microcystin congeners are known [ 6 ]. Microcystins are water-soluble and stable mole...

  Juniper Publishers -  Journal of Oceanography Abstract The Heavy mineral analysis of the beach sediment is one of the finest ways to interpret the presence of the placer deposits in the coast. The point counting method is a widely used technique, which is employed for the quantitative analysis of heavy minerals. Nevertheless, this method is not applicable in case of large scale volumetric or spatial investigations as the surficial sediments occupy an inaccurate space due to its irregular grain size. Therefore, porosity is an important feature that has to be considered for the analyzing the quantitative distribution of the placer minerals present in the surface sediments. This paper highlights the effect of porosity in the heavy mineral distribution with respect to the grain size. The outcome from this research helps to enhance the results in quantitative analysis of heavy minerals. Keywords:  Heavy minerals, porosity, beach, sediments, grain size Go to Heavy mineral ana...