Étude de la végétation des zones riveraines de l'archipel des Cent-îles du fleuve Saint-Laurent, Québec

Tessier, Claude; Maire, Alain; Aubin, A

doi:10.1139/b81-209

Cited by 11 publications

(20 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Comus stolonifera from group 54 of the lacustrine deposit seems to be a species typical of riparian communities (Tessier et al 1981) which confirms its belonging to the lacustrine deposit. For the same deposit, the group with Scutellaria indicates disturbed open and humid sites mixed with shrubs (Scoggan, 1978-79).…”

Section: Lacustrine and Lateglacial Fluvial Featurementioning

confidence: 54%

The use of understory species as indicators of landform ecosystem type in heavily disturbed forest: an evaluation in the Haut-Saint-Laurent, Quebec

Meilleur¹,

Bouchard

Bergeron

1992

Vegetatio

View full text Add to dashboard Cite

An ecological study of the Municipalit6 R6gionale de Comt6 (MRC) du Haut-Saint-Laurent area, a highly disturbed landscape located south-west of Montr6al (Qu6bec), was carried out. The aim of this study was to establish links between indicator species of ecosystems and geomorphological features in a heavily disturbed background. Analysis to obtain the ecological groups are based on the links of herbaceous plants and shrubs. This approach is defined as a sociological one where grouping is based only on the species' affinity. In order to obtain ecological groups, similarity measures using the chi-square coefficient were calculated on the relative cover values of the 150 retained species from 452 plots. An intermediate linkage cluster analysis was then performed on the similarity matrix thus created. By this procedure, 56 ecological groups were obtained. These groups were then characterized according to abiotic variables, especially the geomorphological data, by the use of binary discriminant analysis. Results indicate that 39 of these 56 groups were significantly associated specifically with one of 10 morphogenic features, while 13 of these 56 groups were associated with 2 or 3 features. The ecological groups which were associated with one specific geomorphological process showed a strong link to one texture and one specific drainage class. On the other hand, the groups which were associated with several features were linked with one drainage class, usually imperfect, and a certain topographic situation. However, ecological groups showing a strong association to more than one feature can be of cartographic use, provided soil texture is analysed to determine the origin of the deposit. Finally, the type of deposit becomes non determinant on vegetation where drainage and topographic variables indicate poorly or very poorly drained sites. Non-significant groups should be used as indicators of drainage and topographical conditions but not as indicators of geomorphological deposits. The ecological groups not associated with morphogenic features demonstrated mostly a heliophilic character. Thus, the ubiquitous character of ecological groups is not exclusive to species taking advantage of disturbances. 14

show abstract

Section: Lacustrine and Lateglacial Fluvial Featurementioning

confidence: 54%

The use of understory species as indicators of landform ecosystem type in heavily disturbed forest: an evaluation in the Haut-Saint-Laurent, Quebec

Meilleur¹,

Bouchard

Bergeron

1992

Vegetatio

View full text Add to dashboard Cite

show abstract

“…The predictions are tested using data from seven populations of Laportea canadensis (stinging wood nettle), a robust clonal perennial forb that dominates the herbaceous stratum of many mesic upland and floodplain forests in North America (e.g., Curtis, 1959;Lindsey et al, 1961;Rogers, 1981;Tessier, Maire and Aubin, 1981;Menges, 1983). Laportea produces one to several stems from a tuberous rootstock (Fig.…”

mentioning

confidence: 99%

Biomass Allocation and Geometry of the Clonal Forest Herb Laportea Canadensis: Adaptive Responses to the Environment or Allometric Constraints?

Menges

1987

American J of Botany

View full text Add to dashboard Cite

Using a conceptual model, I predicted the direction of biomass allocation and geometric responses to several environmental variables for Laportea canadensis, a clonal forb dominating the herbaceous stratum of many North American floodplain and mesic forests. Laportea stems and plants, especially dominant ones, generally (60%) respond as predicted to canopy opening, conspecific leaf area and density, and poor drainage, but are merely reduced in growth when growing on sandier soils. However, allometric relationships explain most of the variation in geometry and allocation. Still, variation in geometry and allocation (as great as among 21 species of herbs studied by Givnish [1982]), helps explain the success of Laportea in a range of microenvironments. In upland forests, stems in canopy gaps are tallest but allocate relatively less biomass to leaves than shaded stems, suggesting that interherb competition is the major problem faced under canopy gaps. Leaf morphology also changes with increasing canopy opening—individual leaves are larger, heavier, and thicker and are displayed on more steeply ascending petioles. Floodplain plants respond to light gaps mainly with changes in leaf morphology and display. With increasing conspecific density and leaf production, Laportea stems in both uplands and floodplains grow taller, allocate relatively more biomass to stems, and display leaves higher on the stem. The allocation and geometry of taller stems are more independent of density, and more closely affected by tree‐canopy opening, than are small stems. Intermediate soil textures in floodplains promote maximum Laportea production; variations in other factors are less important. Poorly drained soils in floodplains (heavy‐textured soils at low elevations) cause decreased Laportea height and absolute leaf weight, but increase relative allocation to leaves and roots, as predicted. On the other hand, Laportea appears poorly adapted to sandier soils. Rather than responding to sandier soils as predicted, Laportea's overall growth is reduced. Geometric responses of Laportea to environment are mediated by allometric realities: an increase in height favored in productive environments produces a concomitant decrease in relative leaf allocation. Although predicted (presumably adaptive) shifts are significant when plant size is accounted for, most of the variation in allocation and geometry is due to allometry.

show abstract

“…More data are available for the upstream delta zone (Pilon et al ., 1981 ;Tessier et al, 1981) . Most contaminants in the lake originate from the Great Lakes, the greater Montreal area (via the St .…”

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

Étude de la végétation des zones riveraines de l'archipel des Cent-îles du fleuve Saint-Laurent, Québec

Cited by 11 publications

References 0 publications

The use of understory species as indicators of landform ecosystem type in heavily disturbed forest: an evaluation in the Haut-Saint-Laurent, Quebec

The use of understory species as indicators of landform ecosystem type in heavily disturbed forest: an evaluation in the Haut-Saint-Laurent, Quebec

Biomass Allocation and Geometry of the Clonal Forest Herb Laportea Canadensis: Adaptive Responses to the Environment or Allometric Constraints?

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

Contact Info

Product

Resources

About