Journal
MARINE MICROPALEONTOLOGY
Volume 138, Issue -, Pages 83-89Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.marmicro.2017.10.009
Keywords
Protist; Pollution; Miliolid; Ultrastructure; Cytoplasm; Ammonia; Pseudotriloculina
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Funding
- PRIN Ministero dell'Istruzione, dell'Universita e della Ricerca (MIUR) (protocollo RMTLYR)
- Polytechnic University of Marche
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Heavy metals are known to cause deleterious effects on biota because of their toxicity, persistence and bioaccumulation. 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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