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Titolo:
Differences in the sensitivity of benthic microalgae to Zn and Cd regarding biofilm development and exposure history
Autore:
Ivorra, N; Bremer, S; Guasch, H; Kraak, MHS; Admiraal, W;
Indirizzi:
Univ Amsterdam, Dept Aquat Ecol & Ecotoxicol, Amsterdam Res Inst Substances Ecosyst, NL-1098 SM Amsterdam, Netherlands Univ Amsterdam Amsterdam Netherlands NL-1098 SM M Amsterdam, Netherlands Univ Barcelona, Fac Biol, Dept Ecol, Barcelona 08028, Spain Univ Barcelona Barcelona Spain 08028 , Dept Ecol, Barcelona 08028, Spain
Titolo Testata:
ENVIRONMENTAL TOXICOLOGY AND CHEMISTRY
fascicolo: 5, volume: 19, anno: 2000,
pagine: 1332 - 1339
SICI:
0730-7268(200005)19:5<1332:DITSOB>2.0.ZU;2-T
Fonte:
ISI
Lingua:
ENG
Soggetto:
HEAVY-METALS; CHLOROPHYLL FLUORESCENCE; PERIPHYTON COMMUNITIES; DIATOM COMMUNITIES; STREAM PERIPHYTON; RIVERS; ZINC; COLONIZATION; POPULATION; PHYSIOLOGY;
Keywords:
metals; biofilm; diatoms; biomass; pulse-amplitude fluorometry;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
49
Recensione:
Indirizzi per estratti:
Indirizzo: Ivorra, N Univ Amsterdam, Dept Aquat Ecol & Ecotoxicol, Amsterdam Res InstSubstances Ecosyst, Kruislaan 320, NL-1098 SM Amsterdam, Netherlands Univ Amsterdam Kruislaan 320 Amsterdam Netherlands NL-1098 SM s
Citazione:
N. Ivorra et al., "Differences in the sensitivity of benthic microalgae to Zn and Cd regarding biofilm development and exposure history", ENV TOX CH, 19(5), 2000, pp. 1332-1339

Abstract

Microbenthic biofilms are consortia of autotrophic and heterotrophic organisms imbedded in a matrix of polymers and panicles. As biofilms develop, internal cycling of materials might predominate, and dependence on external conditions is reduced. The mature biofilm structure may act as a barrier against deleterious effects of metals on microphytobenthos. To validate this hypothesis, biofilms from two lowland streams near the Dutch-Belgian border,the extremely Zn- and Cd-polluted Eindergatloop and the relatively clean Keersop in the River Dommel subsystem, were collected after 2 weeks (young) and 6 weeks (old) of colonization Young and old biofilms from both sites were subsequently exposed in the laboratory to Zn and Cd concentrations mimicking that of the heavily polluted stream for a period of 2 weeks. Diatom composition, chlorophyll a, total carbohydrates, Zn and Cd concentrations, minimal chlorophyll fluorescence, and photon yield demonstrated more pronounced metal effects on the young than on the old reference biofilms. In contrast, colonization time had less effect on the overall response of the extremely polluted biofilms. Therefore, biofilms in an early colonization stage are more vulnerable than mature biofilms to metal exposure, and exposure history determines the response of biofilms to metals.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 03/04/20 alle ore 02:15:26