title: Effects of heavy metal accumulation on some reproductive characters in Armadillidium granulatum Brandt (Crustacea, Isopoda, Oniscidea).
abstract: The impact of heavy metal bioaccumulation on reproduction of the isopod Armadillidium granulatum was studied by exposing the animals to food contaminated with various sub-lethal concentrations of cadmium, lead and zinc salts over a period of three weeks. The analysis carried out by atomic absorption spectrometry on whole body and on isolated female and male genital systems highlighted that, although metal's bioaccumulation was always concentration-dependent, it varies considerably depending on the metal (Cd>Zn>Pb) as pointed out by the respective values of the concentration factor. The heavy metals bioaccumulation has influenced in different ways the reproductive characters observed; while no significant difference was found with regard to the length of the incubation period and the number of broods--A. granulatum has an iteroparous reproductive strategy--the onset and the length of the reproductive season were negatively affected by the increase in concentration of the tested metals, in particular of Cd. The rate of gravid females, instead, was negatively affected by the bioaccumulation of Cd and Zn while in the groups treated with the highest concentrations of Pb all females produced at least one brood. The number of juveniles released from the brood pouch at the end of incubation resulted considerably higher and it was always positively correlated to the increase of the concentration of each metal, except for the highest Pb concentration. The explanation of this result, apparently anomalous, could be the object of a future research.
authors.affiliation: Department of Biological, Geological and Environmental Sciences, University of Catania, Via Androne 81, 95124, Catania, Italy. Electronic address: vmazzei@unict.it.
authors.forename: V
authors.initials: V
authors.lastname: Mazzei
authors.forename: G
authors.initials: G
authors.lastname: Longo
authors.forename: M V
authors.initials: MV
authors.lastname: Brundo
authors.forename: C
authors.initials: C
authors.lastname: Copat
authors.forename: G
authors.initials: G
authors.lastname: Oliveri Conti
authors.forename: M
authors.initials: M
authors.lastname: Ferrante
mesh_terms: D000818:Animals; D019256:Cadmium Chloride / Q000378:metabolism / Q000633:toxicity; D002712:Chlorides / Q000378:metabolism / Q000633:toxicity; D004784:Environmental Monitoring; D004785:Environmental Pollutants / Q000378:metabolism* / Q000633:toxicity; D005260:Female; D033321:Isopoda / Q000187:drug effects / Q000378:metabolism / Q000502:physiology*; D007854:Lead / Q000378:metabolism / Q000633:toxicity; D008297:Male; D019216:Metals, Heavy / Q000378:metabolism* / Q000633:toxicity; D012098:Reproduction; D012621:Seasons; D017967:Zinc Compounds / Q000378:metabolism / Q000633:toxicity
chemical_list: D002712:Chlorides; D004785:Environmental Pollutants; D019216:Metals, Heavy; D017967:Zinc Compounds; D007854:Lead; C029891:lead chloride; C016837:zinc chloride; D019256:Cadmium Chloride
keywords: Atomic absorption spectrometry; Cadmium; Concentration factor (CF); Lead; Reproductive parameters; Zinc