Aqueous lead exposure of chub (Leuciscus cephalus) experimentally infected with the parasite Pomphorhynchus laevis resulted in a rapid accumulation of this metal in the intestinal acanthocephalans, reaching concentrations which were significantly greater than in the host muscle, liver, and intestine and approximately 1000 times higher than the exposure con centration. Parasitized chub accumulated significantly less lead in their intestinal wall than their uninfected conspecifics (Mann-Whitney U test, P = 0.05). From in vitro studies it was shown that lead uptake of P. laevis cystacanths clearly increases by adding 1% eel bile to a commercial RMPI-1640 medium containing 0.1 microg ml(-1) Pb(2+) compared to the controls, which were maintained in RMPI-1640 medium containing lead at the same concentration but without bile. It is therefore most likely that P. laevis in chub absorb bile-bound lead from the host intestine and thus reduce its reabsorption by the intestinal wall, thereby interrupting the hepatic-intestinal cycling of the metal. This is the first example of a beneficial impact of a parasite on its host.
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http://dx.doi.org/10.1006/expr.1999.4437 | DOI Listing |
Mol Biol Rep
January 2025
Division of Animal Biotechnology, Faculty of Veterinary Sciences & Animal Husbandry, SKUAST-K, Srinagar, India.
Background: The identification of helminth parasites in Schizothorax spp. from Kashmir, including Schyzocotyle acheilognathi, Pomphorhynchus kashmirensis, and Adenoscolex oreini, is hindered by morphological limitations and high intraspecific variation. While previous studies have relied on morphological diagnosis, a comprehensive molecular characterization is lacking.
View Article and Find Full Text PDFHelminthologia
March 2023
Department of Agroecology and Environmental Protection, Faculty of Plant Protection and Agroecology, Agricultural University - Plovdiv, 12 Mendeleev Blvd, Plovdiv, 4000, Bulgaria.
A total of 72 specimens of (Kessler, 1857), (Pallas, 1814), and (Pallas, 1814) from four sampling sites along the Bulgarian section of the Danube River (Kudelin, Novo selo, Koshava, and Kutovo), Northwestern Bulgaria were submitted to ecologohelminthological investigation. During the examination 6 species of helminths have been identified from 3 classes: Trematoda ( (Iwanitzky, 1928) Dollfus, 1960), Acanthocephala ( (Müller, 1780) Lühe, 1911; (Müller, 1776) Lühe, 1911; (Zoega in Müller, 1776) Porta, 1908) and Nematoda ( sp., Jägerskiöld, 1909).
View Article and Find Full Text PDFSci Total Environ
June 2023
Department of Environmental and Prevention Sciences, University of Ferrara, St. Borsari 46, Ferrara 44121, Italy.
Per- and polyfluoroalkyl substances (PFAS) are resistant to breakdown and are now considered ubiquitous and concerning contaminants. Although scientific and legislative interest in these compounds has greatly increased in recent decades, our knowledge about their environmental fate and their effects on organisms is still incomplete, especially those of the new generation PFAS. In this study, we analysed the level of PFAS contamination in the fish fauna of the Po River, the most important waterway in Italy, to evaluate the influence of different factors (such as fish ecological traits and parasitism) on the accumulation of 17 PFAS.
View Article and Find Full Text PDFEnviron Sci Pollut Res Int
April 2023
Department Aquatic Ecotoxicology, Goethe University of Frankfurt, Max-von-Laue-Straße 13, D-60438, Frankfurt am Main, Germany.
Parasitology
April 2023
Karlsruhe Institute of Technology (KIT), Zoological Institute, Karlsruhe, Germany.
Anthropogenic interference is a major driver of ecological change in freshwater ecosystems. Pollution and the introduction of new species not only alter macrozoobenthic community structures, but can also affect their respective parasite communities. The ecology of the Weser river system experienced a drastic decline in biodiversity over the past century due to salinization caused by the local potash industry.
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