The Hydrochemistry and Plankton Dynamics of a Closed Eutrophic Tropical Lagoon

Nwankwo, DI; Owoseni, T.I; Usilo, D.A; Obinyan, I; Uche, A.C

doi:10.4314/dai.v20i3-4.48143

Cited by 4 publications

(6 citation statements)

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“…The first issue was an increase in Microcystis, causing a decline in evenness, and the second was death of both green algal species towards the end of the 5-week period, causing a decrease in richness. Chlorophyta and Cyanophyta are impacted by nutrient levels (Nwankwo et al 2008). Nutrient depletion may be a factor that relates to Microcystis causing a decrease in richness and evenness of phytoplankton biodiversity.…”

Section: Discussionmentioning

confidence: 99%

Impacts of Microcystis on algal biodiversity and use of new technology to remove Microcystis and dissolved nutrients

et al. 2012

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Cyanobacteria often dominate eutrophic lakes, outcompeting green algae that are required by fish and zooplankton. This study was undertaken to ascertain the impact of the cyanobacterium, Microcystis, on algal biodiversity. Under laboratory conditions, we found that the presence of Microcystis decreased phyla richness by 58%, phyla evenness by 47%, genera richness by 66% and genera evenness by 51%. Analysis by mixed ANOVAs demonstrated a significant interaction between treatment and time and confirmed a significant reduction in richness and evenness of phyla and genera. We also conducted a phosphate restriction assay on the algae in Mason Lake (Irvine, CA, USA) and found that the threshold needed for algal growth there was 0.02 mg L )1 PO 4 . A pilot study was then conducted to test the effectiveness of the Blue Pro TM water treatment facility in removal of this colonial organism from Mason Lake, in addition to removal of dissolved nutrients required for its growth. We measured a 97% reduction in Microcystis cells, a 72% reduction in chlorophyll-a, and a 96% reduction in phosphate after just one 10 min cycle through the unit. Our study demonstrated that removal of Microcystis colonies may allow green algae to increase in numbers. This may improve algal biodiversity, which will benefit zooplankton and fishes.

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Section: Discussionmentioning

confidence: 99%

Impacts of Microcystis on algal biodiversity and use of new technology to remove Microcystis and dissolved nutrients

et al. 2012

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“…Nigerian waters (Abdul et al, 2016;Nwankwo, et al, 2008;Onyema et al, 2003;Akpata et al, 1993 norvegica (Daday) Jörgensen, Horaella species and Acartia longiremis. Tintinnid ciliates (grazers) played an important role, consuming approximately 30% of the primary annual production of phytoplankton, a value equivalent to that of copepods in the pelagial trophic chain (Capriulo and Carpenter, 1983).…”

Section: Zooplankton Composition Distribution and Abundancementioning

confidence: 99%

“…Although baseline data (Nwankwo, et al, 2008;Emmanuel and Onyema, 2007;Akpata et al, 1993) and recent studies (Abdul et al, 2016;Yakub et al, 2012) on zooplankton for Lagos coastal waters exist, frequent species monitoring in the face of increasing human impacts on the Badagry creek is essential. Furthermore, despite these previous studies, the effects of abiotic variables on zooplankton composition and abundance in Badagry creek in spite of its importance have not been investigated.…”

Section: Introductionmentioning

confidence: 99%

Assessment of zooplankton community in an anthropogenic-disturbance coastal creek, southwest Nigeria

Balogun

Ajani

2021

Arch. Agric. Environ. Sci.

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In order to assess the zooplankton community in an anthropogenic-disturbance Badagry creek, Zooplankton and water samples were collected and analyzed bi-monthly from November 2011 to September 2013 in nine stations representing its three different zones using standard methods. Zooplankton was identified to species-level using relevant texts and counted under a Microstar IV Carl Zeiss binocular microscope calibrated at different magnifications. Diversity was determined using Shannon-Weiner (H), Simpson (1-D) and Evenness (e^H/S) indices. Water samples were analysed for temperature, pH, salinity, conductivity, turbidity, dissolved oxygen, water depth and nitrate. Data were analysed using descriptive statistics, ANOVA, cluster and Canonical correspondence analysis (CCA) at α = 0.05. A total of 56 species comprising 26 species of rotifers, 15 species of arthropoda, 4 species of ciliophora, 3 species of cnidaria, and 2 species of ctenophora, foraminifera, mollusca, protozoa each, with an array of meroplankton / juvenile stages of the order copepod of subphylum crustacea were recorded. Diversity indices were highest (H = 2.20; 1-D = 0.80; e^H/S = 0.27) at station 6 and lowest in station 8 (H = 1.20; 1-D = 0.56) and station 1(e^H/S = 0.14). Salinity/conductivity, nitrate and water depth were significantly different (p < 0.05) among the study stations. CCA revealed salinity/conductivity and nitrate were the most important abiotic factors co-related with the zooplankton abundance in Badagry creek. The moderately low zooplankton communities’ diversity and abundance in Badagry creek point at different natural and anthropogenic factor impacts.

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“…Onyema [8] studied the epiphytic assemblage of a polluted estuarine creek in Lagos. Nwankwo et al [9] observed the hydrochemistry and plankton dynamics of Kuramo Lagoon in Nigeria. Plankton studies in the Lagoon also include those of Olaniyan [10] who investigated the zooplankton, Inyang et al [11] who studied the composition of periphyton community on water hyacinth at Ejirin part of Epe Lagoon , Hendey [12] who studied the phytoplankton and Inyang et al [13] who did a comparative study of periphyton on Eichhornia crassipes and Phytoplankton communities at Ejirin part of Epe Lagoon, Sandison and Hill [14] described the distribution and effect of salinity on the life-cycle of Balamus in Lagos harbor and adjourning creeks.…”

Section: Introductionmentioning

confidence: 99%

Diversity of Phytoplankton in Iragbo Part of Yewa Lagoon, Southwest, Nigeria

Effiong¹

2016

AJBIO

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Abstract:A study of the diversity of phytoplankton in Iragbo part of Yewa Lagoon Lagos was conducted for six months, (December, 2012-May, 2013. The surface water transparency was (≥48.5) and showed direct relationship with phytoplankton abundance. A total of 4875 individuals of 77 phytoplankton species belonging to 6 divisions were identified. Phytoplankton biomass was high in the dry months than wet months. Phytoplankton chlorophyll-a value (0.004) was highest in January. The Centrales diatoms dominated the phytoplankton community. A total of 1475 individuals (30.8%) represents Bacillariophyta, while 635 (13.3%), 15 (0.3%), 2525 (52.8%), 115 (2.4%) and 20(0.4%) represents Chlorophyta, Chrysophyta, Cyanophyta, Euglenophyta, and Pyrrophyta respectively. Cyanophyta were the most abundant (52.8%) while Bacillariophyta had the highest species composition of 28 making up (36.4%) of the total species. Diversity was higher in dry months (≥3.42) than wet months (≤2.99). Chlorophyll-a abundance showed positive correlation with Chemical Oxygen Demand (COD), Dissolved Oxygen (DO) and Iron (Fe).

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The Hydrochemistry and Plankton Dynamics of a Closed Eutrophic Tropical Lagoon

Cited by 4 publications

References 0 publications

Impacts of Microcystis on algal biodiversity and use of new technology to remove Microcystis and dissolved nutrients

Impacts of Microcystis on algal biodiversity and use of new technology to remove Microcystis and dissolved nutrients

Assessment of zooplankton community in an anthropogenic-disturbance coastal creek, southwest Nigeria

Diversity of Phytoplankton in Iragbo Part of Yewa Lagoon, Southwest, Nigeria

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