Some traits of zooplankton in the wave-breaking region of rocky and sandy shores of the eastern Libyan Mediterranean Sea (Published)
Zooplankton in seawater samples collected from two wave-breaking regions at the rocky shores of Al-Satah and Al-Warsh, and the shore of a brackish lagoon (Um-Hufayan) devoid of strong waves, during summer, fall, winter, and spring 2019/2020, and filtered through 600µ. 300µ. 75µ, and 40µ sieves stacked on top of each other, were investigated qualitatively and quantitatively. The repeated bombardment of waves on rocky shores of Al-Satah, Al-Warsh, that normally continue for days, had no deleterious effect on plankton. Altogether, 45 zooplankton species or lower-taxa were encountered during the study, the overall concentration of zooplankton was 23199 to 23764 individuals per m3. Zooplankton diversity indices by major-group or major-taxon, species or lower-taxa, site, season, and sieve mesh were established and discussed in terms of salinity, runoff regime, type of bottom substratum and hydrographic conditions of waves and winds. In general, the descending order of zooplankton richness by the number of species per major-groups or major-taxa was Arthropoda, Protozoa, Chordata, Coelenterata (Cnidaria and Ctenophora), Mollusca, Annelida, Gelatinous species, Rotifera, Nematoda, Chaetognatha, and Echinodermata. Abundance by the number of individuals per major-groups or major-taxa was of the order Arthropoda, Protozoa, Mollusca, Annelida, Chordata, Platyhelminthes, Coelenterata, Nematoda, Rotifera, Chaetognatha, Echinodermata, and Gelatinous species.
Citation: Nesreen Ahmed Atea, Sayed Mohamed Ali, Ramadan A. S. Ali(2022) Some traits of zooplankton in the wave-breaking region of rocky and sandy shores of the eastern Libyan Mediterranean Sea, International Research Journal of Natural Sciences, Vol.10, No.1, pp.1-21
Keywords: Mediterranean Sea, Phytoplankton, SURF, Zooplankton, micro-plastics, wave-breaking
Morphology of Phorcus turbinatus (Gastropoda) in the Eastern Libyan Mediterranean Sea (Published)
Three hundred and five Phorcus turbinatus collected from the rocky littorals of Al-Haneah and Susah, eastern Libya’s Mediterranean Sea, were used to establish 15 measured shell-parameters and 18 calculated shell-shape indicators, which were then compared between sites, and related to shell height (HBA) and length of shell base (LB) by regression equations to find out how they vary as the animal grows. Al-Haneah P. turbinatus was larger than Susah’s (HBA = 13.729 and 12.818mm consecutively, corresponding to total weights (TW) of 3.766 and 3.179gm). As a result, the majority of Al-Haneah’s P. turbinatus measured parameters were of greater magnitude. The exponents “b” of the TW-HBA power regressions indicated negative allometric growth, while that of TW-LB indicated positive allometry. The values of the shell shape indicators of P. turbinatus in both sites were close, the shell apex was tilted to the front and to the left, the shell base was almost circular, the opening was slightly oval, and the operculum was circular. All the measured parameters, and most of the shell-shape indicators, increased with growth.
Citation: Adam Ali Faidallah, Ramadan A. S. Ali, Sayed Mohamed Ali, (2021) Morphology of Phorcus turbinatus (Gastropoda) in the Eastern Libyan Mediterranean Sea, International Research Journal of Natural Sciences, Vol.9, No.1, pp.12-18
Keywords: Mediterranean Sea, Monodonta turbinata, Phorcus turbinatus, morphometry, shell shape