Acute and chronic effects of cadmium on blood homeostasis of an estuarine crab, Chasmagnathus granulata, and the modifying effect of salinity
Braz. j. med. biol. res
;
34(4): 509-18, Apr. 2001. ilus, graf
Article
Dans Anglais
| LILACS
| ID: lil-282616
RESUMO
Whole body oxygen consumption and some hemolymph parameters such as pH, partial pressure of gases, level of ions and lactate were measured in the estuarine crab Chasmagnathus granulata after both acute (96 h) and chronic (2 weeks) exposure to cadmium at concentrations ranging from 0.4 to 6.3 mg/l. In all instances, the crabs developed hemolymph acidosis, but no respiratory (increased PCO2) or lactate increases were evident. Hemolymph levels of sodium and calcium were always increased by cadmium exposure. The chronic toxicity of cadmium was enhanced at 12 0/00 salinity, even causing a significantly higher mortality in comparison with the higher salinity (30 0/00) used. A general metabolic arrest took place at 12 0/00 salinity in the crabs chronically exposed to cadmium, as indicated by decreases of oxygen consumption and PCO2, an increase of PO2, along with no changes in lactate levels. These imbalances were associated with severe necrosis and telangiectasia in the respiratory gills, probably leading to respiratory impairment and finally histotoxic hypoxia and death of the animals
Texte intégral:
Disponible
Indice:
LILAS (Amériques)
Sujet Principal:
Cadmium
/
Chlorure de sodium
/
Hémolymphe
/
Brachyura
/
Homéostasie
Limites du sujet:
Animaux
langue:
Anglais
Texte intégral:
Braz. j. med. biol. res
Thème du journal:
Biologie
/
Médicament
Année:
2001
Type:
Article
/
descriptif de projet
Pays d'affiliation:
Argentine
/
Brésil
Institution/Pays d'affiliation:
Fundação Universidade do Rio Grande do Sul/BR
/
Instituto Antarctico Argentino/AR
/
Universidad de Buenos Aires/AR
Documents relatifs à ce sujet
MEDLINE
...
LILACS
LIS