scholarly journals Freshwater molluscs in mountain lakes of the Eastern Alps (Austria): relationship between environmental variables and lake colonization

2007 ◽  
Vol 66 (2) ◽  
pp. 160 ◽  
Author(s):  
Robert STURM
Keyword(s):  
Environmental Variables ◽  
Eastern Alps ◽  
Mountain Lakes ◽  
Freshwater Molluscs

scholarly journals Diatom response to environmental gradients in the high mountain lakes of the Colombia’s Eastern Range

2021 ◽  
Vol 84 (1) ◽  
Author(s):  
Claudia Liliana Muñoz-López ◽  
Carlos A. Rivera-Rondón
Keyword(s):  
Environmental Variables ◽  
Environmental Gradients ◽  
Weighted Average ◽  
Quantitative Information ◽  
Mountain Lakes ◽  
Biological Data ◽  
Physical Factors ◽  
High Mountain ◽  
High Mountain Lakes ◽  
Wide Range

AbstractA survey of 60 high mountain lakes of Colombia’s Eastern Range was performed to evaluate the response of surface-sediment diatoms to environmental variables. In each one of these lakes, water samples were taken for physical and chemical characterization, and diatoms were collected from the superficial bottom sediment at the deepest part. Multivariate statistical analyses were made to determine the relationships between environmental and biological data, specifically which environmental variables explain the diatom distribution. For each of these significant environmental variables, optima and ecological tolerances were calculated using the weighted-average method, which allowed for the classification of the species according to their environmental preferences. The lakes showed a wide range of environmental gradients in variables such as pH, alkalinity, and nutrients. In addition, the depth of the lakes was a direct determinant of the light environment of the water column. A total of 339 diatom taxa were identified belonging mainly to the genera Eunotia and Pinnularia. Variables related to pH-alkalinity gradient, trophic condition (nitrates and phosphorus), and physical factors (radiation at the bottom) had a significant effect on diatom composition. Despite the fact that the total organic carbon environmental range was high, the effect of this variable on diatom species composition was not significant. In conclusion, the diatoms of the studied lakes showed a significant ecological relationship with environmental variables which are potentially important in environmental reconstruction. Diatoms in the study sites can provide useful and independent quantitative information to investigate the recent impacts of global change on tropical high mountain ecosystems.

scholarly journals A new European record of Diadesmis fukushimae and its transference to Humidophila genus (Bacillariophyta)

2015 ◽  
Vol 74 (2) ◽  
pp. 245-252
Author(s):  
Csilla Kövér ◽  
János Korponai ◽  
Sándor Harangi ◽  
Krisztina Buczkó
Keyword(s):  
National Park ◽  
Eastern Alps ◽  
European Population ◽  
Mountain Lakes ◽  
New Combination ◽  
High Mountain ◽  
High Mountain Lakes ◽  
Shenandoah National Park ◽  
Established Genus ◽  
Scanning Electron

Abstract Diadesmis fukushimae, a rare oligotraphenic diatom, was found in some high mountain lakes of Romania. Its occurrence in the Parâng and Retezat Mountains is the second European record of the species. To date D. fukushimae has been known only from the type locality (Shenandoah National Park, Virginia, USA) and from a spring (Grotta Guernica, Dolomiti Bellunesi National Park (south-eastern Alps, Italy). Investigation by scanning electron microscopy showed that this species should be transferred to the recently established genus Humidophila. A new combination is proposed, Humidophila fukushimae. The morphological details of the European population are also presented.

Littoral benthic macroinvertebrates of mountain lakes in the Tatra Mountains (Slovakia, Poland)

Biologia ◽  
2006 ◽  
Vol 61 (18) ◽  
Author(s):  
Il’ja Krno ◽  
Ferdinand Šporka ◽  
Joanna Galas ◽  
Ladislav Hamerlík ◽  
Zuzana Zaťovičová ◽  
...  
Keyword(s):  
Benthic Macroinvertebrates ◽  
Environmental Variables ◽  
Diversity Index ◽  
Mountain Lakes ◽  
Tatra Mountains ◽  
High Concentration ◽  
Small Catchment ◽  
Macroinvertebrate Assemblages ◽  
Acidified Lakes ◽  
The Tatra Mountains

AbstractLittoral benthic macroinvertebrates of 45 mountain lakes in the Tatra Mountains were sampled using a semi-quantitative method in September 2000. A total of 32,852 specimens were identified to 93 taxa belonging to 14 higher taxonomic groups. Multivariate statistics (CCA, RDA) and nine biotic metrics (AQEM/STAR) were used to explain relationships between macroinvertebrate assemblages and environmental variables. Up to 57% of the ecological position of littoral macroinvertebrate assemblages were explained by variance of environmental variables divided into chemical, trophic, physical, catchment and location. Five types of Tatra lakes were recognized using CCA: A — strongly acidified lakes (small catchment, low pH, high concentration of TP, DOC, highest amount of POM in littoral); B — alpine acidified lakes (low amount of POM, low values of biotic metrics); C — alpine non-acidified lakes (high value of diversity index, predominance of Diptera); D — subalpine acidified lakes (high values of biotic metrics: number of families, proportion of crenal and rhithral taxa/total taxa); E — subalpine non-acidified lakes (high values of biotic metrics: number of families, number of genera, BMWP score, number of taxa and abundance of EPT taxa). RDA was used to design five levels of macroinvertebrate taxa acidification tolerance. The Tatra Acidification Index (TAI) was established to assess the acidification status of the lakes in the Tatra Mts.

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