Les facteurs élévation et distance dans la structure et la productivité d'une communauté riveraine de macrophytes

Tessier, Claude; Aubin, A; Chenevier, D.

doi:10.1139/b84-307

Cited by 6 publications

(3 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Given their wide distribution in the fluvial lakes of the St. Lawrence River system, submerged macrophytes offer considerable potential as biological indicators of trace metal 'Author to whom all correspondence should be addressed. lisneria arnericana, the dominant submerged plant of the St. Lawrence River (Gravel and Pageau 1976;Lamoureux and LeSauteur 1982;Pilon et al 1981 ;Tessier et al 1984), suggested concentration frfctors of the order of lo3-lo4 for Cr, Cu, Ni, Pb, and Zn (Environnement Canada 1981). However, neither variations in trace metal concentrations among different species nor possible seasonal changes were evaluated.…”

Section: Introductionmentioning

confidence: 99%

Trace metals in submerged plants of the St. Lawrence River

St-Cyr¹,

Campbell²

1994

Can. J. Bot.

View full text Add to dashboard Cite

ST-CYR, L., and CAMPBELL, P.G.C. 1994. Trace metals in submerged plants of the St. Lawrence River. Can. J. Bot. 72: 429-439. Vallisneria arnericana Michx. (wild celery), a submerged plant ubiquitous in the fluvial lakes St. Louis and St. Pierre of the St.Lawrence River, Quebec, shows potential as a bioindicator species for trace metals in its environment. The Cd, Cr, Cu, Ni, Pb, and Zn concentrations in V. arnericana leaves reflect spatial variations in environmental contamination and represent bioavailable trace metals potentially transferable through the food chain to higher orgaeisms. With the exception of Pb, V. arnericana concentrates trace metals to higher levels in its aboveground tissues than does Potarnogeton richardsonii (A. Bennett) Rydb., another abundant species in the studied lakes, although the two species show the same trend to higher trace metal concentrations at the more contaminated stations. Vallisneria arnericana from Lake St. Pierre shows higher concentrations for all trace metals studied than does the same species from Lake St. Louis (mean concentrations in pg/g dry wt. for Lake St. Pierre versus Lake St. Louis: Cd, 1.62 vs. 0.89; Cr, 3.9 vs. 2.5; Cu, 20.0 vs. 16.5; Ni, 13.1 vs. 5.6; Pb, 3.3 vs. 2.0; Zn, 130 vs. 91). Mean concentrations of Cd, Cr, Ni, and Zn exceed median values of these concentrations for aquatic plants from contaminated sites, as reported in the literature. Key words: Vallisneria arnericana, Potarnogeton richardsonii, bioindicator, trace metals, St. Lawrence River. ST-CYR, L., et CAMPBELL, P.G.C. 1994. Trace metals in submerged plants of the St. Lawrence River. Can. J. Bot. 72 : 429-439. La vallisnCrie amtricaine (Vallisneria urnericann Michx.), une plante submergke omniprksente dans les lacs fluviaux St-Louis et St-Pierre du fleuve St-Laurent, QuCbec, montre un potentiel intiressant en tant qu'espkce bioindicatrice des mCtaux traces dans son environnement. Les concentrations en Cd, Cr, Cu, Ni, Pb et Zn des feuilles reflktent la contamination du milieu et repkentent la partie biodisponible des metaux potentiellement transmissible dans la chaine alimentaire. A I'exception du plomb, la vallisnCrie concentre davantage les mCtaux traces dans ses tissus que le potamot de Richardson (Potarnogeron richardsonii (A. Bennett) Rydb.), autre espkce assez rCpandue dans les lacs CtudiCs, bien que les deux espkces montrent la m&me tendance d'avoir des concentrations plus ClevCes en mCtaux traces aux m&mes stations les plus contaminkes. La vallisnCrie du lac St-Pierre a des concentrations supirieures pour tous les mttaux traces CtudiCs B celle provenant du lac St-Louis (concentrations moyennes, en pg/g poids sec, respectivement, pour les lacs St-Pierre et St-Louis : Cd, 1,62 vs. 0,89; Cr, 3,9 vs. 2,s; Cu, 20 vs. 16,5; Ni, 13,l vs. 5,6; Pb, 3,3 vs. 2,O; Zn, 130 vs. 91). Les concentrations moyennes en Cd, Cr, Ni et Zn sont supCrieures B ce qui est rapport6 dans la IittCrature pour des plantes aquatiques provenant de plans d'eau contaminks. Mots ~1 . 4~ : Vallisneria americana, Potarnogeton...

show abstract

Section: Introductionmentioning

confidence: 99%

Trace metals in submerged plants of the St. Lawrence River

St-Cyr¹,

Campbell²

1994

Can. J. Bot.

View full text Add to dashboard Cite

show abstract

“…2) Semi-quantitative evaluation of the biomass : At 19 stations, individual plants were counted by SCUBA divers in quadrats positioned as for the quantitative evaluation . The conversion of plant density (plants m -2 ) to biomass (g m -2) has already been reported in the literature for selected plant species (Vicars, 1976 ;Adams & Gustafson, 1977 ;Sheldon & Boylen, 1978 ;Tessier et al, 1984) .…”

Section: Field Biomass Datamentioning

confidence: 92%

“…Previous studies dealing with the aquatic vegetation in Lake St. Pierre have been only qualitative (Dery et al, 1983 ;Denis Jacques Enr., 1986) or limited to the productivity of the littoral zone (Tessier et al, 1984) . More data are available for the upstream delta zone (Pilon et al ., 1981 ;Tessier et al, 1981) .…”

Section: Methodsmentioning

confidence: 99%

Evaluation of the role of submerged plant beds in the metal budget of a fluvial lake

1994

View full text Add to dashboard Cite

In a study of a large fluvial lake (Lake St . Pierre, St. Lawrence River system, Quebec), we have determined the biomass of the submerged vegetation (dominated by Vallisneria americana and Potamogeton spp) during the peak seasonal biomass (August) and senescence (October), and have estimated the content of Cd, Cr, Cu, Ni, Pb and Zn in the above-ground portions of these plants . Multispectral remote sensing data (MEIS-II) were used to extrapolate from point measures of biomass (g m_2) to the entire area of the lake (Lavoie et al., 1991). By combining field information (biomass values and metal concentrations) with the more extensive remote sensing data base of biomass values, and by using geostatistical estimation techniques (kriging), we have estimated the seasonal storage of metals in Lake St . Pierre plants to be : 30 kg Cd, 89 kg Cr, 450 kg Cu, 280 kg Ni, 71 kg Pb and 2200 kg Zn . During the seasonal biomass peak, the quantities of Cd, Pb and Zn stored in the plants were higher than those dissolved in the water column, but much lower than those present in the surficial, recent sediments . Mass balance calculations for the summer months indicated that the 'macrophyte' compartment represented only a small proportion of the metals entering the lake : Cu and Ni, <1% ; Cd and Zn, 2% ; Pb, 4% . Senescence and the downstream drifting of plant material noted in October suggested that most of the metals associated with the above-ground parts of the submerged vegetation were not recycled within the lake, but instead were exported at the end of the summer .

show abstract