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Titolo:
COMPARATIVE TOXICANT SENSITIVITY OF SEXUAL AND ASEXUAL REPRODUCTION IN THE ROTIFER BRACHIONUS-CALYCIFLORUS
Autore:
SNELL TW; CARMONA MJ;
Indirizzi:
GEORGIA INST TECHNOL,SCH BIOL ATLANTA GA 30332 UNIV VALENCIA,AREA ECOL E-46100 BURJASSOT SPAIN
Titolo Testata:
Environmental toxicology and chemistry
fascicolo: 3, volume: 14, anno: 1995,
pagine: 415 - 420
SICI:
0730-7268(1995)14:3<415:CTSOSA>2.0.ZU;2-V
Fonte:
ISI
Lingua:
ENG
Soggetto:
RESTING EGGS; PLICATILIS ROTIFERA; POPULATION; ZOOPLANKTON; FERTILITY; SALINITY; DAPHNIA;
Keywords:
LIFE CYCLE; SEXUAL; REPRODUCTION; ROTIFERS; TOXICITY TEST;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
29
Recensione:
Indirizzi per estratti:
Citazione:
T.W. Snell e M.J. Carmona, "COMPARATIVE TOXICANT SENSITIVITY OF SEXUAL AND ASEXUAL REPRODUCTION IN THE ROTIFER BRACHIONUS-CALYCIFLORUS", Environmental toxicology and chemistry, 14(3), 1995, pp. 415-420

Abstract

Cyclically parthenogenetic zooplankters like rotifers are important tools for assessing toxicity in aquatic environments. Sexual reproduction is an essential component of rotifer life cycles, but current toxicity tests utilize only asexual reproduction. We compared the effects of four toxicants on a sexual and sexual reproduction of the rotifer Brachionus calyciflorus. Toxicants has a differential effect on sexual and asexual reproduction, with sexual reproduction consistently the most sensitive. Concentrations of 0.2 mu g/ml PCP (sodium pentachlorophenate) had no effect on the asexual reproductive rate, but significantlyreduced sexual reproduction. Likewise, chlorpyrifos concentrations of0.3 mu g/ml had no significant effect on asexual reproduction, but sexual reproduction was significantly reduced. There was no difference in NOECs, LOECs, and chronic values for asexual and sexual reproductionfor cadmium and naphthol tests. However, comparison of toxicant effect levels revealed that sexual reproduction was more strongly reduced at each toxicant concentration. The four toxicants tested inhibited sexual reproduction 2 to 68 times more than asexual reproduction at the lowest observed effect concentrations. Toxicants inhibited sexual reproduction in its initial step: sexual female production. Because sexual reproduction is more sensitive, toxicity tests based exclusively on asexual reproduction may not be protective of rotifer life cycles.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 03/12/20 alle ore 20:15:45