Abstract
In a concerted effort to apply epipsammic microalgae indices as a biological indicator of crude oil pollution and natural remediation in a tropical estuarine environment, the direct effect of a recent oil spill on the abundance of microalgae in the coastal shore of the Qua Iboe Estuary was investigated. A significant negative effect of contamination on the salinity, acidity and nutritive salts (CO32−, Cl−, and SO42−) levels of the sandy beach soil was observed. The Biological Index of Pollution (BIP) of the beach soil was raised from the previous slightly polluted level (18%) to 75, 88, 45 and 41% after contamination, at sampling distances of 5.5, 9.5, 11.5 and 15 m from the barrier used for pollution control. These corresponded with increases in the density of microalgae with distance from the barrier. This implies that the effect of oil pollution was more severe on microalgal cells that are close to the barrier. The overall effect was a distance-influenced reduction in the regeneration capabilities of the epipsammic microalgae. Some microalgal species, particularly the cyanobacterial species of Aphanizomenon flos-aquae, Lyngbya majusculata,and a centric diatom Actinoptychus undulatus may have been exposed to contamination levels exceeding normal homeostasis and compensation. They lost their existence in the sandy beach, and their absence is recommended for use as an indicator of the short term effect of oil pollution in coastal sandy beaches in a tropical estuarine environment.
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Essien, J.P., Antai, S.P. Negative effects of oil spillage on beach microalgae in Nigeria. World J Microbiol Biotechnol 21, 567–573 (2005). https://doi.org/10.1007/s11274-004-3910-9
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DOI: https://doi.org/10.1007/s11274-004-3910-9