Tag Archives: Zooplankton

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

Effects of Tides on the Zooplankton of the Great Kwa River, Calabar, Nigeria (Published)

This study investigated the tidal effects on the composition, diversity, abundance and distribution of zooplankton species in the Great Kwa river, Nigeria. Zooplankton samples were collected fortnightly between July 2019 and September 2019 at low, mid and high tidal regimes. A total of 59 zooplankton species belonging to 41 taxa (genera) and 16 classes groups were identified and recorded during the study. Zooplankton comprised of 199 individuals of which 49 were recorded in low tide, 95 (mid tide) and 55 (high tide). Generally, Rhizopoda (37.19%) were dominant, followed by Copepods (25.13%) while invertebrate, Lepidoptera and Malacostracan were less than 1% each. Copepods were dominant at low tide, while Rhizopoda were dominant at mid-tide and high-tide. Weiner Index (H) showed that zooplankton species was high at low tide (3.95), followed by high tide (2.95) and least in mid tide (2.22). The absence of some zooplankton species at Mid tide and High tide suggests that zooplankton species had vertically migrated downward the river before high tide and mid tide. Despite the highest number of individuals recorded at mid-tide, an evenness value of 0.49 compared to 0.74 (high-tide) and 0.85 (low-tide), suggests that the numerical abundance was less evenly distributed among species.

Keywords: Great Kwa River, Sampling Station, Species, Tides, Zooplankton

Survey of Zooplanktondiversity and Abundance and Its Relationship with Physicochemical Parameters in River Kashimbila Takum, Taraba State, Nigeria (Published)

Zooplankton diversity and abundance and its relationship with physico-chemical parameters in River Kashimbila was carried out for a period of eight (8) months from August, 2016 to March, 2017.Physico-chemical parameters were determined, the identification and abundance of zooplankton were also determined. A total of twenty one (21) species of zooplankton were reported, which was dominated by Ciliophora (34.61%), followed by Rotifera (32.92%) and the least being Cnidaria (0.02%). Shannon Weinner diversity index ranged from 1.40 -2.72, Margalef Index from 2.37 – 2.72 and evenness from 0.45 – 0.60. The data revealed that there was a significant difference among number of species and species count at (P<0.05) between raining and dry season. Zooplankton diversity and abundance were influenced by seasons and sites while species composition varied significantly with season at (P<0.05).Based on the zooplankton diversity and abundance, the rivers holds high possible impact on fish production.

Keywords: Abundance, Diversity, River Kashimbila, Zooplankton