Assessing the impact of anthropogenic stressors on water quality, sediment characteristics and benthic macroinvertebrates community in a Coastal Lagoon, Southwest Nigeria-Reference-Cited by-同舟云学术

Assessing the impact of anthropogenic stressors on water quality, sediment characteristics and benthic macroinvertebrates community in a Coastal Lagoon, Southwest Nigeria

Published:2023-01-12 Issue: Volume: Page:
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Author:

Adesakin Taiwo¹,Ehikhamele Isaac²,Ogunrinola Oluwaseun²,Oloyede Oyebayo³,Adedeji Adebukola²,Odufuwa Phebian⁴,Aimienoho Amowie⁵,Adedeji Idowu²,Adewumi Emmanuel⁶

Affiliation:

1. Ahmadu Bello University

2. Obafemi Awolowo University

3. Lehigh University

4. Boise State University

5. University of Koblenz-Landau

6. Federal University of Oye-Ekiti

Abstract

Abstract The aim of this study was to investigate the impact of anthropogenic stressors on environmental variables, sediment properties and benthic macroinvertebrate assemblages of Lagos Lagoon. Four sampling stations were established with respect to their importance/ anthropogenic activities within Lagos Lagoon. Surface water, bottom substrates and benthic macroinvertebrate fauna samples were collected at all sampling stations for a year while samples were analyzed using appropriate standard methods and procedures. The highest pH ranged of 7.96–8.01 (7.98 ± 2.35) was recorded at Site IV while the lowest pH mean value of 6.15 ± 1.14 was observed at Site II. Seasonally, the highest values of temperature, electrical conductivity, nitrate and THB (38.10 ± 3.66°C, 61842.83 ± 11777.45 µs/cm, 6.09 ± 3.70 mg/L and 38174.83 ± 79509.21 cfu/ml) were observed at Site I during dry season. The highest sediment pH ranged of 6.18–9.18 (7.58 ± 0.27 mV/pH) for sediment was recorded at Site I while the lowest mean pH was observed at Site II (6.87 ± 0.19 mV). The mean of sulphate, lead, chromium, cadmium and total coliform counts were higher at Site II during the dry season while nickel was higher in the rainy season. A total number of 26 species of benthic macroinvertebrates were observed during the period of study belonging to 8 classes namely: grastropoda (11), polychaeta (7), malacostraca (3), bivalvia (2), clitellata (1), thecostraca (1) and insecta (1). Gastropoda recorded highest percentage contribution of 39.12% followed by Polychaeta accounting for 30.34%, while Malacostraca contribution was 2.63%. High abundance of macroinvertebrates was recorded at Site I (256 Indiv/m2) followed by Site IV (252 Indiv/m2) and least abundance was observed at Site II (195 Indiv/m2). Low macrobenthos recorded in this study could be due to high tolerate of physico-chemical changes. The encroaching into aquatic environment around the globe often introduce toxic chemicals into waterbodies which has led to loss of certain organisms, destabilization of sediments, and thriving of tolerant benthic macroinvertebrates. Concerned authority should pass a law to stop encroaching into aquatic environment for land reclamation as a result of high urbanization around the world.

Publisher

Research Square Platform LLC

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