Heavy-Metal Concentrations in Soft Tissues of the Burrowing Crab Neohelice granulata in Bahía Blanca Estuary, Argentina.
Summary of "Heavy-Metal Concentrations in Soft Tissues of the Burrowing Crab Neohelice granulata in Bahía Blanca Estuary, Argentina."
Copper (Cu), cadmium (Cd), and chromium (Cr) in soft tissues of male and female burrowing crab Neohelice granulate, as well as their eggs, were measured in two different locations in the Bahía Blanca estuary, a moderately polluted ecosystem, from October 2008 to August 2009. Differences between sexes, sites, and seasonality were assessed. Furthermore, metal levels in eggs were compared with metal levels in female crabs. The results showed no significant differences for Cu and Cd between sexes (Student t test p > 0.25 for both sites) and sites (two-way analysis of variance: Cu p = 0.82 and Cd p = 0.29). Nevertheless, seasonality was found, with winter having significantly lower concentrations for both metals. The range of Cu concentrations was between 96.92 and 152.18 μg g(-1) dry weight (dw), and the range of Cd concentrations was between 6.09 and 10.41 μg g(-1) dw. Cr concentrations could not be assessed because most of the values were lower than the detection limit. Although heavy metals in sediments were not measured in this study, a bioaccumulation process may be occurring for Cd because levels found during the entire sampling period were greater than levels in sediment from previous years. For Cu, a regulation process may be occurring considering that this is an essential metal and levels of Cu in N. granulata found in this study were between 1 and 2 orders of magnitude greater than levels in sediments. Finally, Cu and Cd levels in eggs were detectable, but they were lower than levels in female crabs. The importance of these findings is linked to the fact that metal accumulation seems to be occurring before hatch. The presence of heavy metals in soft tissues as well as in eggs of N. granulata is of great importance considering that this is a key species within the Bahía Blanca estuary; therefore, it plays a major role in the transference of pollutants to greater trophic levels.
Área de Oceanografía Química, Instituto Argentino de Oceanografía, CCT-CONICET, Camino La Carrindanga, km 7.5, B8000FWB, Bahía Blanca, Provincia de Buenos Aires, Argentina, email@example.com.
This article was published in the following journal.
Name: Archives of environmental contamination and toxicology
- PubMed Source: http://www.ncbi.nlm.nih.gov/pubmed/21698443
- DOI: http://dx.doi.org/10.1007/s00244-011-9692-9
Medical and Biotech [MESH] Definitions
Therapy of heavy metal poisoning using agents which sequester the metal from organs or tissues and bind it firmly within the ring structure of a new compound which can be eliminated from the body.
The technique of washing tissue specimens with a concentrated solution of a heavy metal salt and letting it dry. The specimen will be covered with a very thin layer of the metal salt, being excluded in areas where an adsorbed macromolecule is present. The macromolecules allow electrons from the beam of an electron microscope to pass much more readily than the heavy metal; thus, a reversed or negative image of the molecule is created.
A heavy, soft, bluish white metal, atomic number 81, atomic weight 204.37, symbol Tl. (From Dorland, 28th ed)
Platinum. A heavy, soft, whitish metal, resembling tin, atomic number 78, atomic weight 195.09, symbol Pt. (From Dorland, 28th ed) It is used in manufacturing equipment for laboratory and industrial use. It occurs as a black powder (platinum black) and as a spongy substance (spongy platinum) and may have been known in Pliny's time as "alutiae".
Heavy Metal Poisoning, Nervous System
Conditions associated with damage or dysfunction of the nervous system caused by exposure to heavy metals, which may cause a variety of central, peripheral, or autonomic nervous system injuries.
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