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Titolo:
Age- and sex-related variation in sensitivity to the pyrethroid cypermethrin in the marine copepod Acartia tonsa Dana
Autore:
Medina, M; Barata, C; Telfer, R; Baird, DJ;
Indirizzi:
Univ Stirling, Inst Aquaculture, Environm Grp, Stirling FK9 4LA, Scotland Univ Stirling Stirling Scotland FK9 4LA Grp, Stirling FK9 4LA, Scotland
Titolo Testata:
ARCHIVES OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY
fascicolo: 1, volume: 42, anno: 2002,
pagine: 17 - 22
SICI:
0090-4341(200201)42:1<17:AASVIS>2.0.ZU;2-H
Fonte:
ISI
Lingua:
ENG
Soggetto:
POLYCYCLIC AROMATIC-HYDROCARBONS; ACUTE TOXICITY; MEIOBENTHIC-COPEPOD; EGG-PRODUCTION; CADMIUM; INVERTEBRATES; REPRODUCTION; TRIBUTYLTIN; ELIMINATION; SURVIVAL;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Life Sciences
Citazioni:
43
Recensione:
Indirizzi per estratti:
Indirizzo: Medina, M Univ Stirling, Inst Aquaculture, Environm Grp, Stirling FK9 4LA,Scotland Univ Stirling Stirling Scotland FK9 4LA ling FK9 4LA, Scotland
Citazione:
M. Medina et al., "Age- and sex-related variation in sensitivity to the pyrethroid cypermethrin in the marine copepod Acartia tonsa Dana", ARCH ENV C, 42(1), 2002, pp. 17-22

Abstract

Acute effects of cypermethrin, a pesticide used to treat ectoparasite infestations of salmon, were assessed using the calanoid copepod Acartia tonsa. A. tonsa has been widely used for hazard assessment of chemicals in the marine environment using acute toxicity tests, but only with randomly selected adults, assuming a sex ratio of 1:1. The present study assesses the environmental hazard of cypermethrin by exposing nauplii and adult males and females, separately. Our results showed that the naupliar stages were 28 timesmore sensitive to cypermethrin than adults after 96 h of exposure, with LC(50)s of 0.005 mug L-1 and 0.142 mug L-1, respectively. Significant differences in sensitivity between sexes were only found during the first 24 h of exposure, with males being approximately twice as sensitive as females. Theresults of age-related variation in sensitivity are supported by studies with other species of copepods and toxicants, where the increased capacity of the adults for detoxification, the allometric differences in weight and size, and the molting process are given as explanations. Variation in sensitivity between sexes is discussed in terms of faster depuration rates in females through egg production and implications of feeding rate changes after 24 h of exposure. Our results suggested that standard toxicity test methodsusing A. tonsa are unsatisfactory because the most sensitive life stage isnot included and sex-related differences in tolerance are not taken into account. We also found that cypermethrin caused significant mortality in Acartia at exposures concentrations from one to three orders of magnitudes lower than the recommended field treatment concentration for copepodic infestations.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 19/01/20 alle ore 20:35:27