Modelling Environmental Factors on Bloom Forming Cyclotella species (Stephanodiscaceae Glezer & Makarova (1986) in the Central Bonny Estuary, Rivers State, Nigeria
DIENYE, E., Sikoki, F., Woke, G., Olopade, O., Ikwuemesi, J. (2023). Modelling Environmental Factors on Bloom Forming Cyclotella species (Stephanodiscaceae Glezer & Makarova (1986) in the Central Bonny Estuary, Rivers State, Nigeria. EKB Journal Management System, 40(2), 171-197. doi: 10.21608/jsrs.2023.331821
EYINA HENRY DIENYE; F. D. Sikoki; G. N. Woke; O. A. Olopade; J. C. Ikwuemesi. "Modelling Environmental Factors on Bloom Forming Cyclotella species (Stephanodiscaceae Glezer & Makarova (1986) in the Central Bonny Estuary, Rivers State, Nigeria". EKB Journal Management System, 40, 2, 2023, 171-197. doi: 10.21608/jsrs.2023.331821
DIENYE, E., Sikoki, F., Woke, G., Olopade, O., Ikwuemesi, J. (2023). 'Modelling Environmental Factors on Bloom Forming Cyclotella species (Stephanodiscaceae Glezer & Makarova (1986) in the Central Bonny Estuary, Rivers State, Nigeria', EKB Journal Management System, 40(2), pp. 171-197. doi: 10.21608/jsrs.2023.331821
DIENYE, E., Sikoki, F., Woke, G., Olopade, O., Ikwuemesi, J. Modelling Environmental Factors on Bloom Forming Cyclotella species (Stephanodiscaceae Glezer & Makarova (1986) in the Central Bonny Estuary, Rivers State, Nigeria. EKB Journal Management System, 2023; 40(2): 171-197. doi: 10.21608/jsrs.2023.331821

Modelling Environmental Factors on Bloom Forming Cyclotella species (Stephanodiscaceae Glezer & Makarova (1986) in the Central Bonny Estuary, Rivers State, Nigeria

Journal of Scientific Research in Science
Volume 40, Issue 2, 2023, Page 171-197  XML PDF (906.46 K)
Document Type: Original Article
DOI: 10.21608/jsrs.2023.331821
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Authors
EYINA HENRY DIENYE email orcid 1; F. D. Sikoki2; G. N. Woke2; O. A. Olopade1; J. C. Ikwuemesi3
1Department of Fisheries, Faculty of Agriculture, University of Port Harcourt Choba, Nigeria.
2Department of Animal and Environmental Biology, University of Port Harcourt Choba, Nigeria.
3Department of Fisheries and Aquatic Resources Management, Michael Okpara University of Agriculture, Umudike. Nigeria.
Abstract
This study was carried out to examine modelling the effects of environmental gradients on bloom-forming Cyclotella species. Plankton samples were collected with a 20 µm mesh plankton net. The physicochemical characteristics were determined in situ, and the nutrients were analyzed in the laboratory using the APHA 2012. The highest mean cell density of 355.43±49.55 Cells L-1 was recorded in station 4, and the lowest of 63.33±17.02 Cells L-1 in station 2 for C. antiqua. In contrast, 360.81±70.05 Cells L-1 was recorded in station 3, with the lowest of 204.67±61.67 Cells L-1 in station 2 for C. meneghiniana spp. respectively. Principal component analysis revealed that TDS, DO, PO4, NO3 and NO2.
In contrast, a positive relationship, while pH and salinity had a negative relationship with C. antiqua. Nitrite, TDS, and DO show a positive relationship, while salinity, phosphate, temperature, and pH negatively correlated with C. meneghiniana across stations. TDS, DO, and NO2 were the most used forecast predictors for Cyclotella spp., which were positively correlated. The observed data were compared with the simulated result. Cyclotella antiqua and meneghiniana increased with a rise in TDS and NO2 as the forecast predictors to ascertain its effect on the predicted species. The increasing human-induced anthropogenic pressure is primarily influencing the eutrophication of water. With an increase in nutrients (TDS and NO2), that species may form a bloom. There is a need for best management practices to address nutrient discharge in the central Bonny estuary.       
Keywords
Cyclotella species; algal species; forecast; correlation; environmental gradient; Bonny estuary
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