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Titolo:
A COMBINED MICROCOSM AND MESOCOSM APPROACH TO EXAMINE FACTORS AFFECTING SURVIVAL AND MORTALITY OF PSEUDOMONAS-FLUORESCENS AG1 IN SEAWATER
Autore:
AHL T; CHRISTOFFERSEN K; RIEMANN B; NYBROE O;
Indirizzi:
ROYAL VET & AGR UNIV,DEPT ECOL & MOLEC BIOL,MICROBIOL SECT,ROLIGHEDSVEJ 21 DK-1958 FREDERIKSBERG C DENMARK ROYAL VET & AGR UNIV,DEPT ECOL & MOLEC BIOL,MICROBIOL SECT DK-1958 FREDERIKSBERG C DENMARK WATER QUAL RES INST,DEPT MICROBIOL DK-2970 HORSHOLM DENMARK UNIV COPENHAGEN,FRESHWATER BIOL LAB DK-3400 HILLEROD DENMARK WATER QUAL RES INST,INT AGCY C14 DETERMINAT DK-2970 HORSHOLM DENMARK
Titolo Testata:
FEMS microbiology, ecology
fascicolo: 2, volume: 17, anno: 1995,
pagine: 107 - 116
SICI:
0168-6496(1995)17:2<107:ACMAMA>2.0.ZU;2-E
Fonte:
ISI
Lingua:
ENG
Soggetto:
LAKE WATER; ESCHERICHIA-COLI; BACTERIA; CULTURABILITY; ECOSYSTEMS; GROWTH;
Keywords:
INTRODUCED MICROORGANISMS; PSEUDOMONAS FLUORESCENS; FACTORS AFFECTING SURVIVAL; MESOCOSMS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
32
Recensione:
Indirizzi per estratti:
Citazione:
T. Ahl et al., "A COMBINED MICROCOSM AND MESOCOSM APPROACH TO EXAMINE FACTORS AFFECTING SURVIVAL AND MORTALITY OF PSEUDOMONAS-FLUORESCENS AG1 IN SEAWATER", FEMS microbiology, ecology, 17(2), 1995, pp. 107-116

Abstract

The survival of Pseudomonas fluorescens Ag1 in seawater of Roskilde Fjord (Denmark) was evaluated by a series of laboratory microcosm and field-based mesocosm experiments. In sterile seawater microcosms, culturability of Ag1 was negatively influenced by high salinity (34 versus 8.5 parts per thousand). In microcosms with 0.2 mu m-filtered seawater, addition of a carbon + nitrogen + phosphorus nutrient mixture was needed to induce proliferation of Ag1. In nutrient-amended microcosms the Ag1 population maintained viability, as determined by the direct viable counts method, at a level dose to 100%. In natural water microcosms, Ag1 decreased by two to three orders of magnitude in three days. Field experiments in 5300-litre seawater enclosures demonstrated a less pronounced decline. The observed average decline rate agreed well withthe calculated average predation potential of heterotrophic nanoflagellates using fluorescence-labelled Ag1 as prey. During the experiment,mesocosms were amended with nutrients as in microcosms to attempt induction of Ag1 cell proliferation in situ, but the decrease rate of Ag1remained unchanged. Viability remained above 25% throughout the experiment, emphasizing that the decline of Ag1 did not result from extensive cell death. The combination of micro and mesocosms proved useful asa test scenario for fate studies of microorganisms introduced into anaquatic environment.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 15/01/21 alle ore 21:48:44