title: The effect of sub-lethal doses of dieldrin on the ventilatory and cardiac activity in two species of shrimps.
abstract: The effect of dieldrin on the heart and ventilatory activity in the shrimps Macrobranchium faustinum and Macrobrachium amazonicum was studied over 4 and 7 day exposure periods, respectively. In M. faustinum, ventilatory rate increased by 43% and heart rate by 14.4%. In M. amazonicum, the ventilatory and heart rates decreased by 21 and 6%, respectively. In M. amazonicum ventilatory reversal frequency, an index of respiratory stress, was 6.7 times higher than the control values. All the changes, except for M. amazonicum heart rate were significant at the 0.01 level of probability.
mesh_terms: D000818:Animals; D033364:Decapoda / Q000187:drug effects* / Q000502:physiology; D004026:Dieldrin / Q000633:toxicity*; D006339:Heart Rate / Q000187:drug effects; D012119:Respiration / Q000187:drug effects; D013045:Species Specificity
chemical_list: D004026:Dieldrin