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Titolo:
Effect of primary producers on the heterotrophic metabolism of a stream biofilm
Autore:
Romani, AM; Sabater, S;
Indirizzi:
Univ Barcelona, Dept Ecol, Fac Biol, E-08028 Barcelona, Spain Univ Barcelona Barcelona Spain E-08028 ac Biol, E-08028 Barcelona, Spain
Titolo Testata:
FRESHWATER BIOLOGY
fascicolo: 4, volume: 41, anno: 1999,
pagine: 729 - 736
SICI:
0046-5070(199906)41:4<729:EOPPOT>2.0.ZU;2-X
Fonte:
ISI
Lingua:
ENG
Soggetto:
TRANSPORT SYSTEM ACTIVITY; MEDITERRANEAN STREAM; ALGAL; COMMUNITY; BACTERIA; DECOMPOSITION; RESPONSES; EPILITHON; WATER;
Keywords:
algae; bacteria; chlorophyll-a; colonization; ectoenzymes;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
33
Recensione:
Indirizzi per estratti:
Indirizzo: Sabater, S Univ Barcelona, Dept Ecol, Fac Biol, Avgda Diagonal 645, E-08028 Barcelona, Spain Univ Barcelona Avgda Diagonal 645 Barcelona Spain E-08028 pain
Citazione:
A.M. Romani e S. Sabater, "Effect of primary producers on the heterotrophic metabolism of a stream biofilm", FRESHW BIOL, 41(4), 1999, pp. 729-736

Abstract

1. The influence of benthic algae on heterotrophic metabolism in a forested Mediterranean stream was investigated. Bacterial density and ectoenzymatic activities, as well as algal biomass (chlorophyll-a) and metabolism (the rate of C-14 incorporation), were measured during colonization over 60 daysof artificial substrata (clay tiles) under light and dark conditions.2. Chlorophyll-a and the rate of C-14 incorporation were significantly higher in light-grown than in dark-grown biofilms. Bacterial density and ectoenzymatic activity (especially beta-glucosidase) were also significantly higher in light-grown biofilms.3. Regressions of chlorophyll-a and C-14 incorporation values on the ectoenzymatic activities were significant. The slopes of regression lines obtained for dark-grown biofilms were significantly higher than those obtained for light -grown biofilms.4. The differences in the slope (of the regression lines) between dark andlight-grown biofilms suggest that the response of the heterotrophs is faster in biofilms with low algal biomass accrual and slows down when algal biomass is increased.5. It is concluded that algal accumulation in the epilithic biofilm influences the use of organic matter by the heterotrophic community by increasingthe amount of organic substrate available for bacteria.

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Documento generato il 02/12/20 alle ore 15:15:08