The Potential Use of the South African River Crab, Potamonautes warreni, as a Bioindicator Species for Heavy Metal Contamination View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2001-06

AUTHORS

P.-Manuela M. Schuwerack, John W. Lewis, Peter Jones

ABSTRACT

In 1995, preliminary water and sediment analyses of the river bed and burrow sediments from 9 locations along the Mooi River, NW Province, South Africa had shown cadmium concentrations up to 0.009 mg l-1 +/- 0.003 and up to 0.33 and 0.89 weight % with scanning electron microscopy (SEM) and x-ray microanalysis. Samples of the adult river crab (Potamonautes warreni) were collected from the Mooi River at Noordbrug (26 degrees 40'S/27 degrees 05'E), 1 km north of Potchefstroom Town, and exposed to 0.2 or 2.0 mg Cd2+ l-1 in situ to determine tolerance, uptake and bioaccumulation of cadmium. Using flame atomic absorption spectroscopy (FAAS) the gills, haemolymph and digestive gland of naturally exposed P. warreni showed wet mass values of 0.74 +/- 0.27 microgram Cd2+ g-1, 0.007 +/- 0.007 microgram ml-1 and 0.12 +/- 0.09 microgram g-1 respectively. The tolerance of crabs to aqueous Cd reached its limit (ET50 = 42 hours) at 2.0 mg l-1 aqueous Cd exposure. At an exposure to 0.2 mg Cd2+ l-1 for 21 days, the greatest Cd (n = 11; 9.99 +/- 5.09 micrograms g-1 wet mass) and Cu concentrations (n = 11; 17.90 +/- 4.66 micrograms g-1 wet mass) were associated with the gills, and to a lesser extent the digestive gland (n = 11; 0.38 +/- 0.20 microgram g-1 wet mass), whereas concentrations of Zn were variable in both organs. In the haemolymph Cd levels were relatively small (n = 11; 0.012-0.006 microgram ml-1) with exposure and time and Cu, Zn concentrations varied. Changes in the uptake of Cd in P. warreni indicated that transport, storage and possibly regulatory mechanisms are likely to operate in adult crabs. The potential of P. warreni as a bioindicator species of pollution is also discussed. More... »

PAGES

159-166

Identifiers

URI

http://scigraph.springernature.com/pub.10.1023/a:1016689810391

DOI

http://dx.doi.org/10.1023/a:1016689810391

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1037939587

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/11383473


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47 schema:description In 1995, preliminary water and sediment analyses of the river bed and burrow sediments from 9 locations along the Mooi River, NW Province, South Africa had shown cadmium concentrations up to 0.009 mg l-1 +/- 0.003 and up to 0.33 and 0.89 weight % with scanning electron microscopy (SEM) and x-ray microanalysis. Samples of the adult river crab (Potamonautes warreni) were collected from the Mooi River at Noordbrug (26 degrees 40'S/27 degrees 05'E), 1 km north of Potchefstroom Town, and exposed to 0.2 or 2.0 mg Cd2+ l-1 in situ to determine tolerance, uptake and bioaccumulation of cadmium. Using flame atomic absorption spectroscopy (FAAS) the gills, haemolymph and digestive gland of naturally exposed P. warreni showed wet mass values of 0.74 +/- 0.27 microgram Cd2+ g-1, 0.007 +/- 0.007 microgram ml-1 and 0.12 +/- 0.09 microgram g-1 respectively. The tolerance of crabs to aqueous Cd reached its limit (ET50 = 42 hours) at 2.0 mg l-1 aqueous Cd exposure. At an exposure to 0.2 mg Cd2+ l-1 for 21 days, the greatest Cd (n = 11; 9.99 +/- 5.09 micrograms g-1 wet mass) and Cu concentrations (n = 11; 17.90 +/- 4.66 micrograms g-1 wet mass) were associated with the gills, and to a lesser extent the digestive gland (n = 11; 0.38 +/- 0.20 microgram g-1 wet mass), whereas concentrations of Zn were variable in both organs. In the haemolymph Cd levels were relatively small (n = 11; 0.012-0.006 microgram ml-1) with exposure and time and Cu, Zn concentrations varied. Changes in the uptake of Cd in P. warreni indicated that transport, storage and possibly regulatory mechanisms are likely to operate in adult crabs. The potential of P. warreni as a bioindicator species of pollution is also discussed.
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