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Titolo:
Delayed effects of embryonic exposure of zebrafish (Danio rerio) to methylmercury (MeHg)
Autore:
Samson, JC; Goodridge, R; Olobatuyi, F; Weis, JS;
Indirizzi:
Rutgers State Univ, Dept Biol Sci, Newark, NJ 07102 USA Rutgers State Univ Newark NJ USA 07102 ept Biol Sci, Newark, NJ 07102 USA
Titolo Testata:
AQUATIC TOXICOLOGY
fascicolo: 4, volume: 51, anno: 2001,
pagine: 369 - 376
SICI:
0166-445X(200102)51:4<369:DEOEEO>2.0.ZU;2-2
Fonte:
ISI
Lingua:
ENG
Soggetto:
FUNDULUS-HETEROCLITUS LARVAE; PREDATOR AVOIDANCE; FEEDING-BEHAVIOR; MUMMICHOG; MERCURY; EMBRYOGENESIS;
Keywords:
Danio rerio; methylmercury; delayed effects; behavior; sublethal; prey capture;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
20
Recensione:
Indirizzi per estratti:
Indirizzo: Samson, JC Rutgers State Univ, Dept Biol Sci, 101 Warren St, Newark, NJ 07102 USA Rutgers State Univ 101 Warren St Newark NJ USA 07102 07102 USA
Citazione:
J.C. Samson et al., "Delayed effects of embryonic exposure of zebrafish (Danio rerio) to methylmercury (MeHg)", AQUAT TOX, 51(4), 2001, pp. 369-376

Abstract

Since previous short-term bioassays of methylmercury (MeHg) indicated no morphological effects in zebrafish (Danio rerio) after embryonic exposures below 20 mug/l MeHg, studies were done to determine whether embryonic exposure to MeHg at lower concentrations would induce behavioral effects. Newly fertilized embryos were exposed to 0, 5, 10 or 15 mug MeHg/l for selected exposure durations: single day, multiple day or continuous exposure from fertilization through hatching. Larvae were maintained in an essential salt solution after hatching. Spontaneous swimming performance and prey capture experiments were conducted. Continuous embryonic exposure to 15 mug/l caused delayed mortality syndrome (DMS). These larvae hatched normally and appearednormal, but beginning at Day 3 post-hatch (ph), general activity was severely reduced and by Day 5 ph, larvae were completely moribund; many had faint heartbeats, severely enlarged body cavities and upward flexures of the spinal cord. Most of these larvae were dead by Day 6 ph. Multi- and single-day embryonic exposures to 15 mug/l caused reduced swimming activity and preycapture ability, and by Day 4 ph, these larvae also began to show signs ofDMS. Continuous embryonic exposure to 10 mug/l significantly reduced spontaneous swimming activity, which did not improve after 5 days in clean water. Similar results were seen in larvae exposed during the last 24 h of embryonic development. Prey capture ability was also impaired in larvae exposed continuously to 10 mug/l, even after 4 days in clean water. Single-day exposures to 10 mug/l did not affect prey capture ability. Larvae from the 5-mug/l exposures were not significantly different from controls for either parameter. This study reinforces the idea that functional impairment is a moresubtle response to developmental toxicants than mortality or the production of morphological defects. (C) 2001 Elsevier Science B.V. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 28/03/20 alle ore 23:10:31