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<p>The benthic foraminifera are widely used to study marginal coastal environments and assess environmental changes as well as the consequences of pollution. The present study aims to investigate benthic foraminiferal associations in sediments polluted by anthropic activities that increase heavy metal contamination along the northern coast of Sfax City in Tunisia. This work is based on the study of two cores, SC1 (80&#xa0;cm) and SC2 (70&#xa0;cm). A granulometric analysis of the sediments was conducted using the sieving method. The foraminifera associations were the subject of a micropaleontological study. Bibliographic data regarding the distribution of heavy metals in the study area are also considered. The foraminiferal density and diversity are high within the unimpacted interval in the lower units of the cores. However, the heavy metal affected intervals in the middle and especially in the upper units, show a decrease in density and diversity of benthic foraminifera, as well as the presence of deformed tests, especially in <i>Ammonia tepida</i>, <i>Peneroplis planatus</i>, <i>Sorites variabilis</i>, and Miliolids. This study also shows that foraminiferal associations in unimpacted environments affected by heavy metals are dominated by species characteristic of shallow water with sandy sedimentary environments, such as <i>Ammonia parkinsoniana</i>, <i>Elphidium</i> (<i>E. advanum</i>, <i>E. crispum</i>, and<i> E. macellum</i>), <i>Peneroplis planatus</i>, <i>Sorites variabilis</i>, and Miliolids. In contrast, opportunistic species such as <i>Ammonia tepida</i> and <i>Haynesina germanica</i> dominate foraminiferal associations in impacted environments.</p>

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The response of benthic foraminiferal associations to anthropogenic pollution on the northern coast of Sfax (Tunisia)

  • 期刊论文

  • 发表日期：

    2025年4月25日

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  • Soumaya Ben Rouina,
  • Jamel Touir,
  • Ali Lamourou,
  • Nathalie Fagel

摘要

The benthic foraminifera are widely used to study marginal coastal environments and assess environmental changes as well as the consequences of pollution. The present study aims to investigate benthic foraminiferal associations in sediments polluted by anthropic activities that increase heavy metal contamination along the northern coast of Sfax City in Tunisia. This work is based on the study of two cores, SC1 (80 cm) and SC2 (70 cm). A granulometric analysis of the sediments was conducted using the sieving method. The foraminifera associations were the subject of a micropaleontological study. Bibliographic data regarding the distribution of heavy metals in the study area are also considered. The foraminiferal density and diversity are high within the unimpacted interval in the lower units of the cores. However, the heavy metal affected intervals in the middle and especially in the upper units, show a decrease in density and diversity of benthic foraminifera, as well as the presence of deformed tests, especially in Ammonia tepida, Peneroplis planatus, Sorites variabilis, and Miliolids. This study also shows that foraminiferal associations in unimpacted environments affected by heavy metals are dominated by species characteristic of shallow water with sandy sedimentary environments, such as Ammonia parkinsoniana, Elphidium (E. advanum, E. crispum, and E. macellum), Peneroplis planatus, Sorites variabilis, and Miliolids. In contrast, opportunistic species such as Ammonia tepida and Haynesina germanica dominate foraminiferal associations in impacted environments.