Classification of the Tatra Mountain lakes (Slovakia) using chironomids (Diptera, Chironomidae)

Biologia ◽  
2006 ◽  
Vol 61 (18) ◽  
Author(s):  
Peter Bitušík ◽  
Marek Svitok ◽  
Peter Kološta ◽  
Marta Hubková
Keyword(s):  
Function Analysis ◽  
Alpine Lakes ◽  
Multiple Regression Model ◽  
Mountain Lakes ◽  
Lake Area ◽  
Taxa Richness ◽  
Chironomid Species ◽  
Species Analysis ◽  
Chironomid Assemblages ◽  
Recovery From Acidification

AbstractChironomid assemblages in thirty-three mountain lakes situated above tree line in the Slovakian part of the Tatra Mountains were studied during 2000–2002. Chironomid species/taxa, collected as pupal exuviae, were correlated with physical, chemical, and lake morphometry variables of 22 lakes. Two-way indicator species analysis (TWINSPAN) was used to classify the lakes into four distinct groups: higher situated alpine lakes, lower situated alpine lakes, subalpine lakes and acidified lakes. Presence/absence of eight taxa was identified as indicative for this classification. In discriminant function analysis, pH, dissolved organic carbon, altitude and lake area were the most significant variables reflecting differences among groups of lakes. This model of four variables allowed 77% success in the prediction of group membership. A multiple regression model with lake area, concentration of magnesium and total phosphorus accounted for 37% of the variance in taxa richness. Lakes with greater area contained more chironomid taxa than smaller ones. Lakes with higher alkalinity and higher trophic status tend to support more taxa. Canonical correspondence analysis (CCA) indicated that most variation in the composition of chironomid assemblages was related to pH and to altitude. The results can be used as reference data for long-term monitoring of the Tatra lakes, especially in connection with a recovery from acidification and global climatic change.

scholarly journals Recent Lake Area Changes in Central Asia

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Haijun Liu ◽  
Yaning Chen ◽  
Zhaoxia Ye ◽  
Yupeng Li ◽  
Qifei Zhang
Keyword(s):  
Central Asia ◽  
Least Squares Method ◽  
Alpine Lakes ◽  
Lake Area ◽  
Interannual Variations ◽  
Study Region ◽  
Moderate Resolution ◽  
Resolution Imaging ◽  
Moderate Resolution Imaging Spectroradiometer ◽  
Global Water

Abstract Using Moderate Resolution Imaging Spectroradiometer (MODIS) 500 m spatial resolution global water product data, Least Squares Method (LSM) was applied to analyze changes in the area of 14 lakes in Central Asia from 2001 to 2016. Interannual changes in lake area, along with seasonal change trends and influencing factors, were studied for the months of April, July and September. The results showed that the total lakes area differed according to interannual variations and was largest in April and smallest in September, measuring −684.9 km2/a, −870.6 km2/a and −827.5 km2/a for April, July and September, respectively. The change rates for the total area of alpine lakes during the same three months were 31.1 km2/a, 29.8 km2/a and 30.6 km2/a, respectively, while for lakes situated on plains, the change rates were −716.1 km2/a, −900.5 km2/a, and −858 km2/a, respectively. Overall, plains lakes showed a declining trend and alpine lakes showed an expanding trend, the latter likely due to the warmer and wetter climate. Furthermore, there was a high correlation (r = 0.92) between area changes rate of all alpine lakes and the lakes basin supply coefficient, although there was low correlation (r = 0.43) between area changes rate of all alpine lakes area and glacier area/lake area. This indicates that lakes recharge via precipitation may be greater than lakes recharge via glacier meltwater. The shrinking of area changes for all plains lakes in the study region was attributable to climate change and human activities.

scholarly journals Temporal Changes and Altitudinal Distribution of Aerobic Anoxygenic Phototrophs in Mountain Lakes

2013 ◽  
Vol 79 (20) ◽  
pp. 6439-6446 ◽  
Author(s):  
Zuzana Čuperová ◽  
Evelyn Holzer ◽  
Ivette Salka ◽  
Ruben Sommaruga ◽  
Michal Koblížek
Keyword(s):  
Altitudinal Gradient ◽  
Alpine Lakes ◽  
Temporal Changes ◽  
Mountain Lakes ◽  
Epifluorescence Microscopy ◽  
Organic Substrates ◽  
Altitudinal Distribution ◽  
Anoxygenic Phototrophs ◽  
Aerobic Anoxygenic Phototrophs ◽  
Low Altitude

ABSTRACTAerobic anoxygenic phototrophs (AAPs) are bacteriochlorophylla-containing microorganisms that use organic substrates for growth but can supplement their energy requirements with light. They have been reported from various marine and limnic environments; however, their ecology remains largely unknown. Here infrared epifluorescence microscopy was used to monitor temporal changes in AAPs in the alpine lake Gossenköllesee, located in the Tyrolean Alps, Austria. AAP abundance was low (103cells ml−1) until mid-July and reached a maximum of ∼1.3 × 105cells ml−1(29% of all prokaryotes) in mid-September. We compared the studied lake with other mountain lakes located across an altitudinal gradient (913 to 2,799 m above sea level). The concentration of dissolved organic carbon and water transparency seem to be the main factors influencing AAP abundance during the seasonal cycle as well as across the altitudinal gradient. While the AAP populations inhabiting the alpine lakes were composed of intensely pigmented large rods (5 to 12 μm), the lakes below the tree line were inhabited by a variety of smaller morphotypes. Analysis ofpufMdiversity revealed that AAPs in Gossenköllesee were almost exclusivelySphingomonadalesspecies, which indicates that AAP communities inhabiting alpine lakes are relatively homogeneous compared to those in low-altitude lakes.

scholarly journals Consequences of pond management for chironomid assemblages and diversity in English farmland ponds

2018 ◽  
Author(s):  
Leslie P. Ruse ◽  
Helen M. Greaves ◽  
Carl D. Sayer ◽  
Jan C. Axmacher
Keyword(s):  
Open Water ◽  
Low Oxygen ◽  
Pupal Exuviae ◽  
Sediment Removal ◽  
Water State ◽  
Chironomid Species ◽  
Chironomid Assemblages ◽  
Oxygen Conditions ◽  
One Year ◽  
Agricultural Areas

Ponds represent a large potential resource for biodiversity in agricultural areas of lowland Europe though many are lost through natural succession towards damp woodland depressions (terrestrialisation). Managing ponds back towards their former open-water state may result in dramatic increases of biodiversity, even on heavily farmed land. Here, evidence is presented of the effects of terrestrialised farmland pond restoration on chironomid assemblages. Chironomid pupal exuviae were collected from three terrestrialised ponds on intensively-farmed land in North Norfolk, Eastern England. Two of the ponds had trees, scrub and sediment removed, while the third pond remained undisturbed as a control. Pupal exuviae collection resumed after the restoration period. In addition, nine unmanaged farm ponds and two formerly restored ponds were sampled. Nearby, another five restored ponds were also sampled for chironomid pupal exuviae. Water data revealed alkalinity, conductivity and phosphorus decreased while pH and dissolved oxygen increased after pond restoration. Chironomid species diversity, similarity and species compositional change were compared pre- and post-restoration. Assessments were made of chironomid species associated with colonisation of restored ponds as well as ponds without such management. After scrub and sediment removal the earliest colonisation of the ponds was by mud-eating species with rapid colonisation traits such as parthenogenesis, multiple generations in one year and tolerance of low oxygen conditions. Subsequent plant growth due to the opening up of the canopy led to consequent improved oxygenation and habitat structure. Other chironomid species dependent on these conditions were then able to compete with the early colonisers. Restoration also made a significant improvement in the number of chironomid species, as assessed by rarefaction curves.

Benthic invertebrate distributions in the San Joaquin River, California, in relation to physical and chemical factors

1998 ◽  
Vol 55 (5) ◽  
pp. 1051-1067 ◽  
Author(s):  
Harry V Leland ◽  
Steven V Fend
Keyword(s):  
Water Quality ◽  
Community Structure ◽  
Indicator Species ◽  
Large Scale ◽  
Community Response ◽  
Indicator Species Analysis ◽  
Dissolved Solids ◽  
Taxa Richness ◽  
San Joaquin River ◽  
Species Analysis

The invertebrate fauna of nontidal portions of the lower San Joaquin River and its major tributaries is described in relation to water quality and habitat using canonical correspondence analysis, autecological metrics, and indicator species analysis. A large-scale (basin-wide) pattern in community response to salinity (sulfate-bicarbonate type) was detected when standardized, stable substratum was sampled. Community structure, taxa richness, and EPT (ephemeropterans, plecopterans, and trichopterans) richness varied with dissolved solids concentration (55-1700 mg total dissolved solids ·L-1), and distributions of many taxa indicated salinity optima. Distinct assemblages associated with either high or low salinity were evident over this range. Large-scale patterns in community structure were unrelated to pesticide distributions. Structure and taxa richness of invertebrate assemblages in sand substratum varied both with salinity and with microhabitat heterogeneity. The benthic fauna generally was dominated by a taxa-poor assemblage of specialized psammophilous species, contributing to a weaker relationship between community structure and water quality than was observed using standardized substratum. Habitat types and associated dominant species were characterized using indicator species analysis. Species assemblages did not vary substantially with irrigation regime or river discharge, indicating that structure of invertebrate communities was a conservative measure of water quality.

scholarly journals Macroinvertebrates of inlets and outlets of the Tatra Mountain lakes (Slovakia)

Biologia ◽  
2006 ◽  
Vol 61 (18) ◽  
Author(s):  
Ladislav Hamerlík ◽  
Ferdinand Šporka ◽  
Zuzana Zaťovičová
Keyword(s):  
Cluster Analysis ◽  
Aquatic Invertebrates ◽  
Benthic Communities ◽  
Alpine Lakes ◽  
Mountain Lakes ◽  
The Other ◽  
Subalpine Lakes ◽  
Taxonomic Groups ◽  
Different Altitudes

AbstractThe composition of invertebrates of inlets and outlets of selected West Tatra and High Tatra lakes (Slovakia, 49°10′ N, 20°00′ E) was analyzed. Twenty-seven sampling sites representing 11 inlets and 16 outlets of 19 mountain lakes were investigated. In total, 10,692 aquatic invertebrates from 27 samples were sorted, 7,314 from inlets and 3,378 from outlets. Altogether, 110 zoobenthic taxa (81 in inlets and 85 in outlets) belonging to 12 higher taxonomic groups were identified. The most constant benthic groups found both in lets and outlets, at more than half of all sites, were Oligochaeta (93% of all sites), Chironomidae (78%), Trichoptera (63%), Plecoptera (59%) and Turbellaria (56%). The most abundant groups were Chironomidae (4,697 ind.), Oligochaeta (2,473 ind.) and Turbellaria (2,236 ind.). No statistically significant differences were found between the benthic communities of inlets and outlets. On the contrary, significant differences (P < 0.05) were found in some parameters of benthic communities of inlets situated in different altitudes (< 1800 m a.s.l., 1800–2000 m a.s.l., > 2000 m a.s.l), outlets of different altitudes, and finally, outlets of lakes with different areas (< 5 ha and ≥ 5 ha). Cluster analysis relatively clearly separated outlets of subalpine lakes from the alpine lakes. Also, outlets of lakes with the lowest pH were separated from the other sites. In the case of inlets, West Tatra sites were separated from the High Tatra sites.

scholarly journals Factors of surface thermal variation in high-mountain lakes of the Pyrenees

PLoS ONE ◽  
2021 ◽  
Vol 16 (8) ◽  
pp. e0254702
Author(s):  
Ibor Sabás ◽  
Alexandre Miró ◽  
Jaume Piera ◽  
Jordi Catalan ◽  
Lluís Camarero ◽  
...  
Keyword(s):  
Mountain Lakes ◽  
Maximum Temperature ◽  
High Mountain ◽  
Lake Area ◽  
Degree Days ◽  
High Mountain Lakes ◽  
Temperature Range ◽  
Relevant Effect ◽  
Lake Temperature ◽  
Accumulated Degree Days

Thermal variables are crucial drivers of biological processes in lakes and ponds. In the current context of climate change, determining which factors better constrain their variation within lake districts become of paramount importance for understanding species distribution and their conservation. In this study, we describe the regional and short-term interannual variability in surface water temperature of high mountain lakes and ponds of the Pyrenees. And, we use mixed regression models to identify key environmental factors and to infer mean and maximum summer temperature, accumulated degree-days, diel temperature ranges and three-days’ oscillation. The study is based on 59 lake-temperature series measured from 2001 to 2014. We found that altitude was the primary explicative factor for accumulated degree-days and mean and maximum temperature. In contrast, lake area showed the most relevant effect on the diel temperature range and temperature oscillations, although diel temperature range was also found to decline with altitude. Furthermore, the morphology of the catchment significantly affected accumulated degree-days and maximum and mean water temperatures. The statistical models developed here were applied to upscale spatially the current thermic conditions across the whole set of lakes and ponds of the Pyrenees.

Unveiling the Synthesis of Spirocyclic, Tricyclic and Bicyclic Triazolooxazines From Intramolecular [3+2] Azide-alkyne Cycloadditions With a Molecular Electron Density Theory Perspective

2021 ◽  
Author(s):  
Nivedita Acharjee ◽  
Haydar A Mohammad-Salim ◽  
Mrinmoy Chakraborty
Keyword(s):  
Electron Density ◽  
Reaction Path ◽  
Function Analysis ◽  
Kinetic Control ◽  
Free Energies ◽  
Covalent Interaction ◽  
Species Analysis ◽  
Molecular Electron ◽  
Oxazine Ring ◽  
Molecular Electron Density Theory

Abstract The intramolecular [3+2] cycloaddition (32CA) reactions of azido alkynes leading to spirocyclic, tricyclic and bicyclic triazolooxazines has been studied within the molecular electron density theory (MEDT) at the MPWB1K/6-311G(d,p) level. The Electron localization function (ELF) characterizes the azido alkynes as zwitterionic species. Analysis of the Conceptual DFT indices allows classifying the azide moiety as the electrophilic counterpart and the alkyne as the nucleophilic one. These 32CA reactions are under kinetic control with the activation free energies of 23.4 - 26.7 kcal mol-1. Along the reaction path, the pseudoradical center is created initially at C4, consistent with the Parr function analysis, however the sequence of bond formation is controlled by the energetically feasible formation of the six membered oxazine ring. The intermolecular interactions at the TSs were characterized from the Quantum Theory of Atoms in Molecules (QTAIM) study and the Non covalent interaction (NCI) gradient isosurfaces.

Changes in the δ13C of pelagic food webs: the influence of lake area and trophic status on the isotopic signature of whitefish (Coregonus lavaretus)

2004 ◽  
Vol 61 (8) ◽  
pp. 1485-1492 ◽  
Author(s):  
Marie-Elodie Perga ◽  
Daniel Gerdeaux
Keyword(s):  
Food Web ◽  
Food Webs ◽  
Trophic Status ◽  
Dissolved Inorganic Carbon ◽  
Alpine Lakes ◽  
Coregonus Lavaretus ◽  
Lake Area ◽  
Pelagic Food Web ◽  
Pelagic Food Webs ◽  
Lake Size

We investigated the relationships between the pattern of variation of δ13C in pelagic food webs and various morphologic and trophic characteristics of peri-alpine lakes. We used the δ13C of whitefish (Coregonus lavaretus), a long-lived zooplanktivorous fish, to assess the isotope ratio of dissolved inorganic carbon (DIC) at the origin of the pelagic food web. The δ13C of DIC depends on its origin, which may be the atmosphere or the mineralization of organic matter. A synchronic study of 22 peri-alpine lakes shows that the surface area of the lake accounts for much of the variability of the δ13C in pelagic food webs (r2 = 0.76). The δ13C increases with lake size, which suggests that the origin of the DIC integrated into the pelagic food web depends on lake size. To differentiate the influence of trophic status from morphological effects, a diachronic study was performed on the δ13C of fish scales collected over the 20-year re-oligotrophication of Lake Geneva. The δ13C of whitefish increased with phosphorus concentration (r2 = 0.71). This pattern is related to the growing demand for atmospheric DIC as primary production increases.

Sensory and Cognitive Components of Auditory Processing in Individuals With Tinnitus

2019 ◽  
Vol 28 (4) ◽  
pp. 834-842
Author(s):  
Harini Vasudevan ◽  
Hari Prakash Palaniswamy ◽  
Ramaswamy Balakrishnan
Keyword(s):  
Selective Attention ◽  
Auditory Processing ◽  
Function Analysis ◽  
Event Related Potential ◽  
Oscillatory Activity ◽  
Default Mode ◽  
Auditory Selective Attention ◽  
Cognitive Components ◽  
Mode Function ◽  
Related Potentials

Purpose The main purpose of the study is to explore the auditory selective attention abilities (using event-related potentials) and the neuronal oscillatory activity in the default mode network sites (using electroencephalogram [EEG]) in individuals with tinnitus. Method Auditory selective attention was measured using P300, and the resting state EEG was assessed using the default mode function analysis. Ten individuals with continuous and bothersome tinnitus along with 10 age- and gender-matched control participants underwent event-related potential testing and 5 min of EEG recording (at wakeful rest). Results Individuals with tinnitus were observed to have larger N1 and P3 amplitudes along with prolonged P3 latency. The default mode function analysis revealed no significant oscillatory differences between the groups. Conclusion The current study shows changes in both the early sensory and late cognitive components of auditory processing. The change in the P3 component is suggestive of selective auditory attention deficit, and the sensory component (N1) suggests an altered bottom-up processing in individuals with tinnitus.

Sign in / Sign up

Export Citation Format

Share Document