Ecological Indicator Values as an Aid in the Interpretation of Ordination Diagrams

1981 ◽  
Vol 69 (1) ◽  
pp. 71 ◽  
Author(s):  
S. Persson
Keyword(s):  
Ecological Indicator ◽  
Indicator Values ◽  
Ecological Indicator Values

scholarly journals Critical multi-stranded approach for determining the ecological values of diatoms in unique aquatic ecosystems of anthropogenic origin

2019 ◽  
Author(s):  
Rafał M. Olszyński ◽  
Ewelina Szczepocka ◽  
Joanna Żelazna-Wieczorek
Keyword(s):  
Surface Waters ◽  
Environmental Conditions ◽  
Aquatic Ecosystems ◽  
Ecological Indicator ◽  
Indicator Values ◽  
Chemical Parameters ◽  
Physical And Chemical Parameters ◽  
Characteristic Species ◽  
Physical And Chemical ◽  
Ecological Indicator Values

Background. The ecological state of surface waters is typically assessed by a multi-aspect approach based on a determination of its chemical and physical parameters, by hydromorphology and the use of indicator organisms such as benthic diatoms. By assigning ecological indicator values, it is possible to create diatom indices which serve as the basic tool in assessing the ecological status of surface waters. These ecological indicator values are set according to classification systems, such as the Van Dam et al. 1994 system, which classifies species of diatoms according to seven different ecological factors. However, recent studies on the autecology of diatoms have shown the need to verify and establish new ecological indicator values. To this end, aquatic ecosystems are good environments to observe the range of tolerance of benthic diatoms to environmental conditions due to their unique physical and chemical parameters. The aim of the present study was to propose the establishment of new, or altered, ecological indicator values, according to Van Dam et al. classification, of species of diatoms characteristic of three post-mining aquatic ecosystems. Methods. In total, 36 species were identified that were characteristic of three waterbodies: a salt aquatic complex (water outflow, a drainage ditch and a pond), a mined iron ore reservoir and a mined lignite reservoir. Their ecological indicator values were calculated using OMNIDIA software, and the environmental conditions prevailing in the studied ecosystems were determined. Of the 36 characteristic species, 16 lacking at least one assigned ecological indicator value were analysed further. The analysis identified three groups of selected characteristic species which showed a correlation, or lack of such, to the tested physical and chemical parameters. Results. Based on this multistage study of the autecology of characteristic diatoms, comprising an analysis of environmental conditions, literature analysis and reference ecological indicator values of other species, it is proposed that 32 ecological indicator values be established or adjusted for 16 species, and that Planothidium frequentissimum be excluded from water quality assessments.

Phytosociological affiliation of Annex II species Tephroseris longifolia subsp. moravica in comparison with two related Tephroseris species with overlapping distribution

Biologia ◽  
2013 ◽  
Vol 68 (5) ◽  
Author(s):  
Katarína Hegedüšová ◽  
Iveta Škodová ◽  
Monika Janišová ◽  
Judita Kochjarová
Keyword(s):  
Related Species ◽  
Environmental Gradients ◽  
Vascular Plant ◽  
Nutrient Content ◽  
Soil Reaction ◽  
Ecological Indicator ◽  
Indicator Values ◽  
Closely Related Species ◽  
Phytosociological Relevés ◽  
Ecological Indicator Values

AbstractThe phytosociological affiliation of Tephroseris longifolia subsp. moravica, species of European importance, was studied in relation to two closely related species of the genus Tephroseris which have overlapping distribution within the Western Carpathian Mts: T. intergrifolia and T. crispa. The main aim was to compare plant communities inhabited by the three taxa, to assess the major environmental gradients responsible for variation in their distribution and to estimate ecological indicator values for Tephroseris longifolia subsp. moravica. T. longifolia subsp. moravica was recorded in nine localities in the Slovakia and Czech Republic where it occurs in very specific site conditions of ecotone habitats. Its phytosociological affiliation is restricted to grasslands of the alliances Bromion erecti and Arrhenatherion elatioris and to the ecotone vegetation between these grasslands and beech forests. T. integrifolia occurs most frequently in the Diantho lumnitzeri-Seslerion, Bromion erecti and Quercion pubescenti-petraeae alliances. T. crispa occurs predominantly in communities of the Calthion palustris alliance and Scheuchzerio-Caricetea fuscae, Mulgedio-Aconitetea and Montio-Cardaminetea classes. The major gradient responsible for variation in species composition of communities inhabited by the studied taxa was associated with moisture and nutrient content. The vascular plant-based ecological indicator values for Tephroseris longifolia subsp. moravica calculated from phytosociological relevés with its occurrence were set for light — 6, temperature — 5, continentality — 4, moisture — 5, soil reaction — 6 and nutrients — 5. We conclude that the studied taxon has intermediate relationship to the most of the studied factors in comparison with two related species, T. crispa and T. integrifolia.

scholarly journals Critical multi-stranded approach to determining the tolerance and ecological values of diatoms in unique aquatic ecosystems of anthropogenic origin

2019 ◽  
Author(s):  
Rafał M. Olszyński ◽  
Ewelina Szczepocka ◽  
Joanna Żelazna-Wieczorek
Keyword(s):  
Surface Waters ◽  
Environmental Conditions ◽  
Aquatic Ecosystems ◽  
Ecological Indicator ◽  
Indicator Values ◽  
Chemical Parameters ◽  
Characteristic Species ◽  
Water Ecosystems ◽  
Physical And Chemical ◽  
Ecological Indicator Values

Background. The ecological state of surface waters is typically assessed by a multi-aspect approach based on a determination of its chemical and physical parameters by hydromorphology and the use of indicator organisms such as benthic diatoms. By assigning ecological indicator values (EIV), it is possible to create diatom indexes which serve as the basic tool in assessing the ecological status of surface waters. These ecological indicator values are set according to classification systems, such as the Van Dam et al. system, which classifies species of diatoms according to seven different ecological factors. However, recent studies on the autecology of diatoms have shown the need to verify and establish new ecological indicator values. To this end, water ecosystems are good environments to observe the range of tolerance of benthic diatoms to environmental conditions due to their unique physical and chemical parameters. The aim of the present study was to propose the establishment of new, or changed, ecological indicator values, according to Van Dam et al., of species of diatoms characteristic of three post-mining aquatic ecosystems Methods. In total, 36 species were identified that were characteristic of three water ecosystems: a salt water complex, a mined iron ore reservoir and a mined lignite reservoir. Their ecological indicator values were calculated using OMNIDIA software, and the environmental conditions prevailing in the studied ecosystems were determined. Of the 36 characteristic species, 16 lacking at least one assigned ecological indicator value were analysed further. The analysis identified three groups of selected characteristic species which showed a correlation, or lack of such, to the tested physical and chemical parameters. Results. Based on this multistage study of the autecology of characteristic diatoms, comprising an analysis of environmental conditions, literature analysis and reference indicator values of other species, it is proposed that 32 ecological indicator values be established or adjusted for 16 species, and that Planothidium frequentissimum be excluded from water quality assessments.

Sign in / Sign up

Export Citation Format

Share Document