Benthic diatom flora in relation to chemical and physical factors in high mountain lakes in the Rila Mountains (southwestern Bulgaria)

2009 ◽  
Vol 62 ◽  
pp. 153-166
Author(s):  
Nadja Ognjanova-Rumenova ◽  
Ivan Botev ◽  
Martin Kernan
Keyword(s):  
Mountain Lakes ◽  
Benthic Diatom ◽  
Physical Factors ◽  
High Mountain ◽  
High Mountain Lakes ◽  
Diatom Flora

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 Responses of Benthic Macroinvertebrate Communities of Two Tropical, High-Mountain Lakes to Climate Change and Deacidification

Diversity ◽  
2021 ◽  
Vol 13 (6) ◽  
pp. 243
Author(s):  
Javier Alcocer ◽  
Luis A. Oseguera ◽  
Diana Ibarra-Morales ◽  
Elva Escobar ◽  
Lucero García-Cid
Keyword(s):  
Climate Change ◽  
Species Richness ◽  
Water Temperature ◽  
Water Level ◽  
Environmental Changes ◽  
Mountain Lakes ◽  
High Mountain ◽  
Macroinvertebrate Communities ◽  
High Mountain Lakes ◽  
La Luna

High-mountain lakes are among the most comparable ecosystems globally and recognized sentinels of global change. The present study pursued to identify how the benthic macroinvertebrates (BMI) communities of two tropical, high mountain lakes, El Sol and La Luna, Central Mexico, have been affected by global/regional environmental pressures. We compared the environmental characteristics and the BMI communities between 2000–2001 and 2017–2018. We identified three principal environmental changes (the air and water temperature increased, the lakes’ water level declined, and the pH augmented and became more variable), and four principal ecological changes in the BMI communities [a species richness reduction (7 to 4), a composition change, and a dominant species replacement all of them in Lake El Sol, a species richness increase (2 to 4) in Lake La Luna, and a drastic reduction in density (38% and 90%) and biomass (92%) in both lakes]. The air and water temperature increased 0.5 °C, and lakes water level declined 1.5 m, all suggesting an outcome of climate change. Contrarily to the expected acidification associated with acid precipitation, both lakes deacidified, and the annual pH fluctuation augmented. The causes of the deacidification and the deleterious impacts on the BMI communities remained to be identified.

scholarly journals Using a morpho-functional approach to assess phytoplankton dynamics in two adjacent high-mountain lakes: a 10-year survey

2014 ◽  
Vol 73 (3) ◽  
Author(s):  
Renata Trevisan ◽  
Marco Picarella ◽  
Frank B. Dazzo ◽  
Stefano Bona ◽  
Giuseppe Morabito ◽  
...  
Keyword(s):  
Functional Approach ◽  
Mountain Lakes ◽  
High Mountain ◽  
Phytoplankton Dynamics ◽  
High Mountain Lakes

scholarly journals Trapping of Organochlorine Compounds in High Mountain Lakes

2001 ◽  
Vol 1 ◽  
pp. 609-611 ◽  
Author(s):  
Joan O. Grimalt ◽  
Pilar Fernandez ◽  
Rosa M. Vilanova
Keyword(s):  
Atmospheric Transport ◽  
Mountain Lakes ◽  
Organochlorine Compounds ◽  
High Mountain ◽  
High Latitudes ◽  
High Mountain Lakes ◽  
Mountain Areas ◽  
Persistent Pollutants

High mountain areas have recently been observed to be polluted by organochlorine compounds (OC) despite their isolation. These persistent pollutants arrive at these remote regions through atmospheric transport. However, the mechanisms involving the accumulation of these compounds from the atmospheric pool to the lacustrine systems still need to be elucidated. These mechanisms must be related to the processes involving the transfer of these pollutant from low to high latitudes[1] as described in the global distillation effect[2].

scholarly journals Perspectives for an integrated understanding of tropical and temperate high-mountain lakes

2016 ◽  
Vol 75 (s1) ◽  
Author(s):  
Jordi Catalan ◽  
John C. Donato Rondón
Keyword(s):  
Global Change ◽  
Freshwater Ecosystems ◽  
Mountain Lakes ◽  
Molecular Techniques ◽  
Mountain Lake ◽  
Tropical Lakes ◽  
High Mountain ◽  
Essential Difference ◽  
High Mountain Lakes ◽  
High Mountain Lake

<p>High mountain lakes are extreme freshwater ecosystems and excellent sentinels of current global change. They are likely among the most comparable ecosystems across the world. The largest contrast occurs between lakes in temperate and tropical areas. The main difference arises from the seasonal patterns of heat exchange and the external loadings (carbon, phosphorus, metals). The consequence is a water column structure based on temperature, in temperate lakes, and oxygen, in tropical lakes. This essential difference implies that, in tropical lakes, one can expect a more sustained productivity throughout the year; a higher nutrient internal loading based on the mineralization of external organic matter; higher nitrification-denitrification potential related to the oxyclines; and a higher metal mobilization due to the permanently reduced bottom layer. Quantifying and linking these and other biogeochemical pathways to particular groups of organisms is in the current agenda of high-mountain limnology. The intrinsic difficulties of the taxonomic study of many of the organisms inhabiting these systems can be now overcome with the use of molecular techniques. These techniques will not only provide a much less ambiguous taxonomic knowledge of the microscopic world, but also will unveil new biogeochemical pathways that are difficult to measure chemically and will solve biogeographical puzzles of the distribution of some macroscopic organism, tracing the relationship with other areas. Daily variability and vertical gradients in the tropics are the main factors of phytoplankton species turnover in tropical lakes; whereas seasonality is the main driver in temperate communities. The study of phytoplankton in high-mountain lakes only makes sense in an integrated view of the microscopic ecosystem. A large part of the plankton biomass is in heterotrophic, and mixotrophic organisms and prokaryotes compete for dissolved resources with eukaryotic autotrophs. In fact, high-mountain lake systems are excellent model ecosystems for applying an investigation linking airshed to sediments functional views. Additionally, the study of the mountain lakes districts as functional metacommunity units may reveal key differences in the distribution of organisms of limited (slow) dispersal. We propose that limnological studies at tropical and temperate high mountain lakes should adhere to a common general paradigm. In which biogeochemical processes are framed by the airshed-to-sediment continuum concept and the biogeographical processes in the functional lake district concept. The solid understanding of the fundamental limnological processes will facilitate stronger contributions to the assessment of the impacts of the on-going global change in remote areas.</p>

Photoreactivity of Dissolved Organic Matter from High-Mountain Lakes of Sierra Nevada, Spain

2001 ◽  
Vol 33 (4) ◽  
pp. 426 ◽  
Author(s):  
I. Reche ◽  
E. Pulido-Villena ◽  
J. M. Conde-Porcuna ◽  
P. Carrillo
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Sierra Nevada ◽  
Mountain Lakes ◽  
High Mountain ◽  
High Mountain Lakes

Zooplankton advective losses may affect chlorophyll-a concentrations in fishless high-mountain lakes

Limnetica ◽  
2019 ◽  
Vol 38 (1) ◽  
pp. 55-65
Author(s):  
Rafael Morales-Baquero ◽  
Carmen Pérez-Martínez ◽  
Eloísa Ramos-Rodríguez ◽  
Pedro Sánchez-Castillo ◽  
Manuel Villar-Argaiz ◽  
...  
Keyword(s):  
Chlorophyll A ◽  
Mountain Lakes ◽  
High Mountain ◽  
High Mountain Lakes
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