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  • 1
    Electronic Resource
    Electronic Resource
    Reversal of eutrophication in Lake Geneva: evidence from the oligochaete communities (1992)
    Oxford, UK : Blackwell Publishing Ltd
    Freshwater biology 28 (1992), S. 0 
    Details
    ISSN: 1365-2427
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: 1. In Lake Geneva (Switzerland), total phosphorus concentrations have decreased from 90 mg m−3 in 1979 to 55 mg m−3 in 1990.2. To assess the effects of this improvement, tubificid and lumbriculid communities were sampled in 1982 and in 1991 in the same areas, at a depth of 40 m.3. Abundance of mesotrophic species (mostly Potamothrix vejdovskyi) and of eutrophic species (mostly Potamothrix hammoniensis) was lower in 1991 than in 1982; in contrast, oligotrophic species (mostly Peloscolex velutinus) were more abundant in 1991 than in 1982.4. The changes recorded in 1991 were the same as those associated with a decrease of organic sedimentation.5. Mean relative abundance of oligotrophic species increased from 17% in 1982 to 41% in 1991. According to these values, Lake Geneva was mesoeutrophic in 1982, but mesotrophic in 1991.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2427.1992.tb00571.x
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  • 2
    Electronic Resource
    Electronic Resource
    Colonisation d'une population d'Oscillatoria rubescens (Cyanophyceae) par une bacterie epiphyte (1989)
    Springer
    Aquatic sciences 51 (1989), S. 59-66 
    Details
    ISSN: 1420-9055
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The presence of unknown bacteria upon filaments of the CyanophyteOscillatoria rubescens was observed in the Lake Leman (Lake of Geneva) during Autumn 1985. Conditions of this colonization and the morphology of the association are described. These bacteria probably belong to theCaulobacter group. To explain this colonization we suggest that bacteria respond chemotactically to Cyanophyte exudates.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00877781
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  • 3
    Electronic Resource
    Electronic Resource
    Water quality in rivers of western Switzerland: Application of an adaptable index based on benthic invertebrates (1989)
    Springer
    Aquatic sciences 51 (1989), S. 224-234 
    Details
    ISSN: 1420-9055
    Keywords: Benthos ; index ; invertebrates ; rivers ; Switzerland ; water quality
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Water quality was estimated from 205 samples of benthic invertebrates collected between 1982 and 1986 in 51 rivers of western Switzerland (canton of Vaud). Each sample consisted of the combined list of taxa resulting from one spring sample pooled with one summer sample. Water quality was indicated by total number of taxa and number of taxa intolerant of pollution: i. e. Heptageniidae, Plecoptera, and Trichoptera with a case. Six classes of values were delimited for each of these two variables by cluster analysis. Values from zero to five were attributed to each class. The index of water quality was computed by adding these two values in each sample. According to this index, good water quality was indicated by 42% of samples. This index can be adapted to other rivers because its components are easily modified.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00877744
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  • 4
    Electronic Resource
    Electronic Resource
    An improved index of environmental quality for Swiss rivers based on benthic invertebrates (1995)
    Springer
    Aquatic sciences 57 (1995), S. 172-180 
    Details
    ISSN: 1420-9055
    Keywords: Benthos ; environmental quality ; index ; invertebrates ; river ; water quality
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A total of 1424 samples of benthic invertebrates, collected in 56 rivers of western Switzerland (canton of Vaud), was used to improve the RIVAUD (Rivers of Vaud) index of environmental quality. This index, described for the first time in 1989, was based on total number of taxa and on number of taxa intolerant of pollution (Plecoptera, Heptageniidae, and Trichoptera with a case). The 1995 version of RIVAUD, called RIVAUD 95, presented a larger range of values (0–20) than the previous one (0–10), to describe more precisely the variations of environmental quality. According to RIVAUD 95, the environmental quality of Swiss rivers increased with the altitude of sampling sites because anthropogenic impacts decreased along the same gradient. This altitudinal pattern was used to define classes of environmental quality which can be adapted to the rivers of other regions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00877385
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  • 5
    Electronic Resource
    Electronic Resource
    Empirical relationships between diversity of invertebrate communities and altitude in rivers: Application to biomonitoring (1993)
    Springer
    Aquatic sciences 55 (1993), S. 188-196 
    Details
    ISSN: 1420-9055
    Keywords: benthos ; biodiversity ; biomonitoring ; empirical relationships ; rivers ; water quality
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The relationships between the diversity of invertebrate communities and the altitude of sampling sites were analysed in 438 benthic samples, collected between 1982 and 1991, in 56 rivers of western Switzerland. Diversity, estimated from total number of taxa (genus or family) and from number of taxa intolerant of pollution, was positively correlated with increasing altitude. In contrast, density of human population and the level of organic pollution were negatively correlated with increasing altitude. Therefore, the upstream increase of invertebrate diversity was attributed to the decrease of human population which is the main source of organic pollution. In this study, altitude was used, instead of organic pollution, to predict diversity. Empirical relationships between diversity and altitude were applied to surveys of water quality to describe the general altitudinal pattern characteristic for each region and to single out anomalous sites and rivers. In addition, changes in the altitudinal patterns of diversity can be used to monitor the recovery of rivers from pollution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00877448
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  • 6
    Electronic Resource
    Electronic Resource
    Les fibrilles deCoelastrum cambricum (chlorophycées) (1974)
    Springer
    Archives of microbiology 95 (1974), S. 181-186 
    Details
    ISSN: 1432-072X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Résumé La microscopie, photonique et électronique, révèle qu'une couronne de fibrilles orne la paroi deCoelastrum cambricum var.intermedium (Bohlin) G. W. West. Ces fibrilles, composées de sous-unités, ne comportent pas de striations transversales comme celles deScenedesmus strain 614 par exemple. Elles sembleraient être partiellement à l'origine du mucilage qui entoure la cellule.
    Notes: Summary Light and electron microscopy reveal a crown of bristles on the cell wall ofCoelastrum cambricum var.intermedium (Bohlin) G. W. West. These bristles are composed of subunits, but have no cross-striations, e.g., those inScenedesmus strain 614. The bristles seem partly to be the origin of the mucilage surrounding the cell.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02451759
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  • 7
    Electronic Resource
    Electronic Resource
    La paroi cellulaire de Coelastrum (Chlorophycées) (1975)
    Springer
    Archives of microbiology 102 (1975), S. 95-101 
    Details
    ISSN: 1432-072X
    Keywords: Coelastrum ; Chlorococcales ; Chlorophyta ; Ultrastructure ; Cell Wall ; Tubules ; Bristles ; Polymorphism ; Buoancy ; Taxonomy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Résumé La paroi cellulaire de Coelastrum est généralement composée de trois couches. La couche la plus externe a été plus particulièrement étudiée. Elle est composée de tubules dressées, et porte souvent de longues fibrilles dont le rôle serait de stabiliser l'algue dans son milieu. La morphologie de la paroi cellulaire peut se modifier en fonction du milieu.
    Notes: Abstract The cell wall of Coelastrum is usually composed of three layers. The outermost layer was studied most extensively. It consists of erect tubules which often bear long bristles whose function may be to stabilize the algae in its environment. The cell wall can modify its morphology according to the environment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00428352
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  • 8
    Electronic Resource
    Electronic Resource
    Reversal of eutrophication in four Swiss lakes: evidence from oligochaete communities (1996)
    Springer
    Hydrobiologia 334 (1996), S. 157-161 
    Details
    ISSN: 1573-5117
    Keywords: biomonitoring ; eutrophication ; indicator species ; lake ; oligochaetes ; recovery ; zoobenthos
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Following the limitation of phosphorus inputs, total phosphorus concentrations decreased substantially between 1980 and 1990 in four lakes of western Switzerland. Tubificid and lumbriculid communities of Lakes Geneva and Neuchâtel responded clearly to this decrease. Indeed, mean relative abundance of species typical of oligotrophic conditions (mostly Stylodrilus heringianus and Spirosperma velutinus) doubled in oligochaete communities of both these deep lakes (〉 40 m). These changes indicated that both lakes were meso-eutrophic around 1980, but mesotrophic since 1990. In contrast, oligochaete communities of Lakes Morat and Joux, which consisted mostly of tolerant species (Tubifex tubifex, Potamothrix hammoniensis, and Limnodrilus hoffmeisteri), did not indicate an improvement of environmental conditions between 1980 and 1990. In Lake Joux the ratio of chironomid to oligochaete biomass was a more simple indicator of change than the species present in oligochaete communities.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00017365
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  • 9
    Electronic Resource
    Electronic Resource
    Contrasting responses of oligochaete communities to the abatement of eutrophication in Lake Geneva (1995)
    Springer
    Hydrobiologia 308 (1995), S. 77-82 
    Details
    ISSN: 1573-5117
    Keywords: biomonitoring ; eutrophication ; indicator species ; lake ; recovery ; zoobenthos
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Tubificid and lumbriculid worms were used to monitor, at depths of 150 m, the recovery of Lake Geneva (Switzerland) from eutrophication. As predicted from the decrease of phosphorus concentrations, relative abundance of oligotrophic species was higher from 1988 to 1993 than in 1983, i.e. before the abatement of eutrophication. However, this trend towards oligotrophication can be reversed, as indicated by a decrease of oligotrophic species, recorded in 1993. But this change corresponded to the effects of an increase of water temperature on the abundance of the mesotrophic species Potamothrix vejdovskyi rather than to a deterioration of the profundal. In addition to this short-term setback, oligochaete communities located at a depth of 150 m responded more slowly and less clearly to the decrease of phosphorus concentrations than those located at a depth of 40 m. However, the zoobenthos indicated more clearly the recovery of Lake Geneva than the phytoplankton.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00037789
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  • 10
    Electronic Resource
    Electronic Resource
    Les Stephanodiscus (Diatomées) du Lac Léman: Description d'une nouvelle espèce, Stephanodiscus irregularis; mise au point taxonomique et distributions saisonnières (1987)
    Springer
    Hydrobiologia 148 (1987), S. 79-86 
    Details
    ISSN: 1573-5117
    Keywords: Lake Geneva ; Diatoms ; Stephanodiscus ; morphology ; taxonomy ; ecology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The Stephanodiscus (Diatoms) of Lake Geneva: Taxonomic changes, description of a new species (Stephanodiscus irregularis) and seasonal distributions. Both light and electron microscopy have been used to describe the species of Stephanodiscus collected in the plankton of Lake Geneva (Lac Léman, France-Switzerland) during the last few years. Eight taxa have been identified: S. irregularis nov. sp.; S. alpinus Hustedt = S. astraea var. minutula (Kütz.) Grunow; S. binderianus (Kütz.) Krieger var. binderianus; S. binderianus var. oestrupii (A. Cl.) A. Cl.; S. minutula (Kütz.) Round; S. parvus Stoermer & Hakansson = S. subtilis Van Goor var. subtilis; S. neoastraea Hakansson & Hickel; Cyclostephanos dubius (Fricke) Round = S. dubius (Fricke) Hustedt. Seasonal and interannual variations of some of these species are also presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00018168
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