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Article Dans Une Revue Marine Micropaleontology Année : 2018

Benthic foraminiferal ultrastructural alteration induced by heavy metals

Résumé

Heavy metals are known to cause deleterious effects on biota because of their toxicity, persistence and bioac-cumulation. Here, we briefly document the ultrastructural changes observed in the miliolid foraminifer Pseudotriloculina rotunda (d'Orbigny in Schlumberger, 1893) and in the perforate calcareous species Ammonia parkinsoniana (d'Orbigny, 1839) induced by exposure to one of three heavy metals (zinc, lead, or mercury). The exposure of these two benthic foraminiferal species to the selected heavy metals appears to promote cytological alterations and organelle degeneration. These alterations include a thickening of the inner organic lining, an increase in number and size of lipid droplets, mitochondrial degeneration, and degradation vacuoles and residual body proliferation. Some of these alterations, including the thickening of the inner organic lining and the proliferation of lipids, might represent defense mechanisms against heavy metal-induced stress.
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hal-02442500 , version 1 (13-12-2022)

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Paternité - Pas d'utilisation commerciale - Pas de modification

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Fabrizio Frontalini, Maria Pia Nardelli, Daniele Curzi, Ana Martín González, Anna Sabbatini, et al.. Benthic foraminiferal ultrastructural alteration induced by heavy metals. Marine Micropaleontology, 2018, 138, pp.83-89. ⟨10.1016/j.marmicro.2017.10.009⟩. ⟨hal-02442500⟩
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