The Ecology of Two Aquatic Isopods Annina mesopotamica (Ahmed, 1971) and Sphaeroma annandale annandale (Stebbing, 1911) in the Intertidal Zone of the Garmat Ali River, Basrah, Iraq
et al., A. (2025). The Ecology of Two Aquatic Isopods Annina mesopotamica (Ahmed, 1971) and Sphaeroma annandale annandale (Stebbing, 1911) in the Intertidal Zone of the Garmat Ali River, Basrah, Iraq. EKB Journal Management System, 29(1), 857-874. doi: 10.21608/ejabf.2025.407265
Al-Baghdadi et al.. "The Ecology of Two Aquatic Isopods Annina mesopotamica (Ahmed, 1971) and Sphaeroma annandale annandale (Stebbing, 1911) in the Intertidal Zone of the Garmat Ali River, Basrah, Iraq". EKB Journal Management System, 29, 1, 2025, 857-874. doi: 10.21608/ejabf.2025.407265
et al., A. (2025). 'The Ecology of Two Aquatic Isopods Annina mesopotamica (Ahmed, 1971) and Sphaeroma annandale annandale (Stebbing, 1911) in the Intertidal Zone of the Garmat Ali River, Basrah, Iraq', EKB Journal Management System, 29(1), pp. 857-874. doi: 10.21608/ejabf.2025.407265
et al., A. The Ecology of Two Aquatic Isopods Annina mesopotamica (Ahmed, 1971) and Sphaeroma annandale annandale (Stebbing, 1911) in the Intertidal Zone of the Garmat Ali River, Basrah, Iraq. EKB Journal Management System, 2025; 29(1): 857-874. doi: 10.21608/ejabf.2025.407265

The Ecology of Two Aquatic Isopods Annina mesopotamica (Ahmed, 1971) and Sphaeroma annandale annandale (Stebbing, 1911) in the Intertidal Zone of the Garmat Ali River, Basrah, Iraq

Egyptian Journal of Aquatic Biology and Fisheries
Article 48, Volume 29, Issue 1, January and February 2025, Page 857-874  XML PDF (668.79 K)
DOI: 10.21608/ejabf.2025.407265
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Author
Al-Baghdadi et al.
Abstract
During the period from January to December 2022, two species of Isopods Annina mesopotamica (Ahmed, 1971) and Sphaeroma annandalei annandalei (Stebbing, 1911) were studied in the intertidal zone of the Garmat Ali River. The current study aimed to assess the density, occurrence and distribution of the two species and their relationship to the surrounding environmental factors. Monthly samples from three fixed stations were collected, using a quadrate with an area of 0.0625m2 at each station. The monthly rates of various environmental factors, including temperature, pH, salinity, current speed, light transmittance and DO, as well as the presence of these two species, were evaluated. The population density of S. annandalei reached 192 individuals/m2 during May at station 3. The lowest value was 16 individuals/m2 recorded during June and October at first two stations and in July at the third station. On the other hand, the highest values for A. mesopotamica reached 144 individuals/m2 during May at station 3, no individuals were recorded during Sept. at station 2 and in Aug. and Sept. at station 3. The findings revealed no notable distinction between the linear regression equations for male and female animals, which allowed for their consolidation into a single linear equation for each species. At the three stations an inverse significant correlation was found between salinity, temperature and light transmittance with the numerical density of the two species. Additionally, the pH, DO and current speed had a significant positive correlation with the numerical density.
Keywords
Isopod crustaceans; Garmat Ali River; Basrah; Iraq
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