References of "Vanderpoorten, Alain"
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See detailEtude écosystémique d'une gravière de l'ancien lit majeur du Rhin (Krafft-Erstein, Bas-Rhin, France)
Klein, J. P.; Vanderpoorten, Alain ULg

in Martinia (1999), 15(1), 3-13

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See detailInventaire des plantes aquatiques du lit majeur de la Moselle, France, Luxembourg et Allemagne
Klein, J. P.; Vanderpoorten, Alain ULg

in Willemetia (1999), 3(18), 1-6

The inventory of the aquatic flora found in the Moselle river indicates the state of botanical knowledge at the end of 1999. It includes a total of 48 aquatic macrophytes and 20 bryophytes. Among the ... [more ▼]

The inventory of the aquatic flora found in the Moselle river indicates the state of botanical knowledge at the end of 1999. It includes a total of 48 aquatic macrophytes and 20 bryophytes. Among the recorded species two are protected in France (Luronium natans, Pilularia globulifera) and two in the Lorraine region (Potamogeton gramineus, Vallisneria spiralis). [less ▲]

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See detailA comparative study of the hydrophyte flora from the Alpine Rhine to the Middle Rhine. Application to the conservation of the Upper Rhine aquatic ecosystems
Vanderpoorten, Alain ULg; Klein, J. P.

in Biological Conservation (1999), 87(2), 163-172

A typology of the main channel of the river Rhine according to its aquatic bryophyte and vascular hydrophyte assemblages is presented. The aquatic bryophytes are especially abundant in the main channel ... [more ▼]

A typology of the main channel of the river Rhine according to its aquatic bryophyte and vascular hydrophyte assemblages is presented. The aquatic bryophytes are especially abundant in the main channel, having found stable, rocky habitats with variable water levels in the regulated river, and segregate longitudinally along a gradient of water quality. Conversely, the vascular hydrophytes are restricted to side channels with constant discharges and silt deposits, and segregate laterally along a gradient of connectivity with the main river. The hydrophytes have been affected by water eutrophication which became obvious in the 1960s-1970s. The oligotrophic groundwater-fed side-channels disconnected since the river canalization consequently include a relic reference flora. Important hydraulic works are currently in progress in order to protect the areas located downstream from the canalized Rhine from flooding by retaining the river waters in lateral systems during the discharge peaks and to recreate a functional alluvial floodplain by reconnecting the disconnected side-channels to the main river. The floodpulse caused by the suddent input of surface water in the disconnected brooks will probably wash out most of the hydrophytes and it is very likely that the rare species with their low recolonization strategies will disappear in these conditions. It is highly desirable to preserve from flooding the last oligotrophic brooks with their original hydrophyte assemblages. Those brooks which show a tendency to silt up can be re-dynamized by ecological engineering without disturbing the flowing drains of the watertable. In areas (including flowing drains of the watertable) that have already been designated for flood retention, the hydraulic works should allow, as far as possible, the preservation of the flowing oligotrophy streams by only permitting the input of surface water in the silted-up brooks. The disconnected side-channels could then continue their role as refugia from where the main channel, whose water quality has been improving for a decade, could be recolonized by its primary flora. [less ▲]

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See detailVariations of aquatic bryophyte assemblages in the Rhine Rift related to water quality. 1.The Alsatian Rhine floodplain
Vanderpoorten, Alain ULg; Klein, J. P.; Stieperaere, H. et al

in Journal of Bryology (1999), 21

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See detailCorrelative and experimental investigations on the segregation of aquatic bryophytes as a function of water chemistry in the Walloon hydrographic network
Vanderpoorten, Alain ULg

in Lejeunia (1999), (No. 159), 1-17

The aquatic bryophyte assemblages of the Walloon hydrographic network [Belgium] are significantly correlated to the gradients of water pollution. Experimental cultures showed that Fe and benzopyrene ... [more ▼]

The aquatic bryophyte assemblages of the Walloon hydrographic network [Belgium] are significantly correlated to the gradients of water pollution. Experimental cultures showed that Fe and benzopyrene, which were among the most significantly correlated factors with the changes in the aquatic bryophyte assemblages, did not inhibit the growth of the investigated taxa, at concentrations much higher than those measured in rivers. The correlation of these factors with the floristic assemblages is thus an artefact due to the inter-correlation between the variables. The concentrations of N-NH4+ inducing a growth inhibition varied between 10 mg/litre in a population of Amblystegium tenax and 500 mg/litre in A. riparium. The lethal concentrations are similar to the current annual mean concentrations of this factor in the polluted rivers of this network. This factor is thus directly implied in the segregation of these species along a gradient of water pollution. The populations of A. tenax coming from a heavily polluted area exhibited a tolerance to N-NH4+ five to ten times higher than the populations coming from unpolluted rivers. These result suggest that ecotypes may exist in this species [less ▲]

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See detailAquatic bryophytes for a spatio-temporal monitoring of the water pollution of the rivers Meuse and Sambre (Belgium)
Vanderpoorten, Alain ULg

in Environmental Pollution (1999), 104(3), 401-410

Jaccard's distances between the aquatic bryophyte assemblages recorded in 1972-1973 and in 1997 in nine study sites along the Belgian course of the rivers Meuse and Sambre were correlated with the ... [more ▼]

Jaccard's distances between the aquatic bryophyte assemblages recorded in 1972-1973 and in 1997 in nine study sites along the Belgian course of the rivers Meuse and Sambre were correlated with the differences of concentrations of 13 physico-chemical factors (O2, N-NO2-. N-NH4+, N-NO3-, P-PO43-, K+, pH, Ca++, Fe, Cu, Pb, Zn and Mn) between 1972-1973 and 1996. The strong decrease in heavy metals pollution and the decrease of the trophic level are correlated with the recolonization of the most polluted sites in the 1970s by the pollution-sensitive species present in the valleys at the beginning of the century. Conversely, N-NO2-, N-N03" and K+ have increased between the two surveys. They currently reach much higher concentrations in the Sambre than in the Meuse, as well as N and micro-pollutants such as pyrene and anionic detergents. The different loads of these factors in the studied rivers might explain their different recolonization patterns. Although some species might have developed a tolerance to certain factors, an effort to improve the quality of the effluents coming from industrial areas still remains to be made, especially in the frame of the projects of river flooding of the riverine areas. [less ▲]

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See detailTrophic Response Curves of Aquatic Bryophytes in Lowland Calcareous Streams
Vanderpoorten, Alain ULg; Durwael, L.

in Bryologist (1999), 102(4), 720-728

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See detailMorphologie, distribution et écologie comparées d'Amblystegium tenax et d'A. fluviatile en Belgique
Vanderpoorten, Alain ULg; Empain, Alain ULg

in Belgian Journal of Botany (1999), 132(1), 3-12

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See detailPlatyhypnidium mutatum, a mysterious new moss from Germany
Ochyra, R.; Vanderpoorten, Alain ULg

in Journal of Bryology (1999), 21

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See detailCanonical variables of aquatic bryophyte combinations for predicting water trophic level
Vanderpoorten, Alain ULg; Palm, R.

in Hydrobiologia (1998), 386(1-3), 85-93

A method for predicting water quality by linear regression using aquatic bryophy te canonical variables as predictors is presented. An example of application in the Alsatian Rhine valley is developed. The ... [more ▼]

A method for predicting water quality by linear regression using aquatic bryophy te canonical variables as predictors is presented. An example of application in the Alsatian Rhine valley is developed. The /--squared obtained before and after cross-validation reached 0.68 and 0.58 for the standard deviation of temperatures, 0.55 and 0.46 for the logarithm of the mean concentrations of N-NH4+, 0.52 and 0.43 for the logarithm of the mean concentrations of N-NO3- and 0.38 and 0.31 for the logarithm of the mean concentrations of P-PO43-. Higher r-squared were not expected due to the broad physico-chemical ranges and the low diversity of genuine aquatic bryophytes. The predicted values of the mean concentrations of N-NH4+, P-PO43- and of the standard deviation of temperatures were often greater than the measured ones. The aquatic bryophytes integrate the sudden increase of the trophic level in oligotrophic streams during the floods of the main eutrophic river and testify to a higher trophic level than expected from regular physico-chemical analyses outside the flood period. Aquatic bryophytes are also affected by water quality in the long term and indicate pollutants other than those measured in current water quality. Other factors besides trophic level might influence the aquatic bryophyte assemblages and should be monitored in order to find the precise relationships between water quality and aquatic macrophytes and in order to create a more accurate model of the effects of the flooding of disconnected streams by the Rhine waters (currently in progress in the Upper Rhine) on the aquatic macrophyte assemblages. [less ▲]

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See detailBryological patterns and streamwater acidification in the Vosges mountains (N.E. France): an analysis tool for the survey of acidification processes
Thiebaut, Gabrielle; Vanderpoorten, Alain ULg; Guerold, François et al

in Chemosphere (1998), 36(6), 1275-1289

The relationships between water chemistry and aquatic bryoflora in the Vosges Mountains (Eastern France) were studied in an attempt to survey the processes of acidification. 6 chemical variables (pH, Mg2 ... [more ▼]

The relationships between water chemistry and aquatic bryoflora in the Vosges Mountains (Eastern France) were studied in an attempt to survey the processes of acidification. 6 chemical variables (pH, Mg2+, Ca2+, K+, N03-, Al) were used to explain the segregation of the bryophytic communities concerning 19 species in 31 study sites. Ca2+, Mg2+ and a lesser extend pH and Al are the four variables best explaining the relationships between the bryophytes and the chemical data. Acidophilus species as Marsupella emarginata seem to be sensitive to high cations concentrations. On the contrary neutrophilous species as Rhynchostegium riparioides may be more sensitive to the toxicity of protons or Al than to lacks of cations. The combinations of bryophytes are used to reconstitute the chemical variables and the precision of the modelling is assessed. [less ▲]

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See detailJungermannia paroica (Schiffn.) Grolle in the Vosges, new to France
Vanderpoorten, Alain ULg; Sotiaux, André ULg

in Journal of Bryology (1997), 19

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See detailDeux POHLIA méconnus d'Alsace: P.lutescens (Limpr.) Lindb. et P. lescuriana (Sull.) Andrews
Vanderpoorten, Alain ULg

in Bulletin de la Société d'Histoire Naturelle de Colmar (1997), 63

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