Effects of lead pollution on Ammonia parkinsoniana (foraminifera) : ultrastructural and microanalytical approaches
Giordano, Francesco M.
Bernhard, Joan M.
MetadataShow full item record
The responses of Ammonia parkinsoniana (Foraminifera) exposed to different concentrations of lead (Pb) were evaluated at the cytological level. Foraminifera-bearing sediments were placed in mesocosms that were housed in aquaria each with seawater of a different lead concentration. On the basis of transmission electron microscopy and environmental scanning electron microscopy coupled with energy dispersive spectrometer analyses, it was possible to recognize numerous morphological differences between untreated (i.e., control) and treated (i.e., lead enrichment) specimens. In particular, higher concentrations of this pollutant led to numerical increase of lipid droplets characterized by a more electron-dense core, proliferation of residual bodies, a thickening of the organic lining, mitochondrial degeneration, autophagosome proliferation and the development of inorganic aggregates. All these cytological modifications might be related to the pollutant-induced stress and some of them such as the thickening of organic lining might suggest a potential mechanism of protection adopted by foraminifera.
© The Author(s), 2015. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in European Journal of Histochemistry 59 (2015): 2460, doi:10.4081/ejh.2015.2460.
The following license files are associated with this item:
Except where otherwise noted, this item's license is described as Attribution-NonCommercial 3.0 Unported
Showing items related by title, author, creator and subject.
Combined carbonate carbon isotopic and cellular ultrastructural studies of individual benthic foraminifera : method description Martin, Jonathan B.; Bernhard, Joan M.; Curtis, Jason H.; Rathburn, Anthony E. (American Geophysical Union, 2010-06-11)Carbon isotopes of foraminiferal tests provide a widely used proxy for past oceanographic environmental conditions. This proxy can be calibrated using live specimens, which are reliably identified with observations of cell ...
Combined carbonate carbon isotopic and cellular ultrastructural studies of individual benthic foraminifera : 2. Toward an understanding of apparent disequilibrium in hydrocarbon seeps Bernhard, Joan M.; Martin, Jonathan B.; Rathburn, Anthony E. (American Geophysical Union, 2010-10-22)Numerous previous studies show disequilibrium between stable carbon isotope ratios of foraminiferal calcite and pore water dissolved inorganic carbon in hydrocarbon seeps, calling into question the utility of this widely ...
Studies on the cell wall of dinoflagellate resting cysts : morphological development, ultrastructure, and chemical composition Kokinos, John P. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1994-06)This thesis presents a series of investigations on the specialized cell covering of a dormant stage (the resting cyst) in the life cycle of the marine dinoflagellate Lingulodinium polyedra. These cell walls, along with ...