Seasonality of mean flows as a potential tool for the assessment of ecological processes: Mountain rivers, Polish Carpathians

Radecki‐Pawlik, Artur; Wałęga, Andrzej; Młyński, Dariusz; Młocek, Wojciech; Kokoszka, Rafał; Tokarczyk, Tamara; Szalińska, Wiwiana

doi:10.1016/j.scitotenv.2020.136988

Cited by 17 publications

(9 citation statements)

References 81 publications

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“…This observation is supported by the Kolmogorov–Smirnov (K–S) test ( p value < 0.05), high values of skewness, and kurtosis coefficients. Skewness values are larger than 1, which show that distribution asymmetry is right-skewed for all metals [ 48 ]. It is consistent with mean, median, and upper quartile.…”

Section: Resultsmentioning

confidence: 99%

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Comprehensive Evaluation of Metal Pollution in Urban Soils of a Post-Industrial City—A Case of Łódź, Poland

et al. 2020

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The pollution of urban soils by metals is a global problem. Prolonged exposure of habitants who are in contact with metals retained in soil poses a health risk. This particularly applies to industrialized cities with developed transport networks. The aim of the study was to determine the content and spatial distribution of mobile metal fractions in soils of the city of Łódź and to identify their load and sources. Multivariate statistical analysis (principal component analysis (PCA), cluster analysis (CA)), combined with GIS, were used to make a comprehensive evaluation of the soil contamination. Hot-spots and differences between urban and suburban areas were also investigated. Metals were determined by atomic absorption spectrometry (AAS) after soil extraction with 1 mol L−1 HCl. In most sites, the metal content changes in the following order: Zn > Pb > Cu > Ni > Cd. About one-third of the samples are considerably (or very highly) contaminated, (contamination factor, CF > 3) with Cu, Pb, or Zn. In almost 40% of the samples, contaminated soils were found (pollution load index, PLI > 1). All metals have a strong influence on the first principal component (PC1), whereas second principal component (PC2) is related to pH. Polluted soils are located in the downtown, in the south and east part of the city. The distribution of contamination coincides with the urban layout, low emission sources and former industrial areas of Łódź.

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Section: Resultsmentioning

confidence: 99%

“…Kurtosis values are higher than 0 for all metals. It indicates leptokurtic distribution, which is characterized by being more peaked shape than normal [ 17 , 48 , 51 ]. The best fitting for all metals is presented by lognormal distribution (K–S p value > 0.20) [ 8 ].…”

Section: Resultsmentioning

confidence: 99%

Comprehensive Evaluation of Metal Pollution in Urban Soils of a Post-Industrial City—A Case of Łódź, Poland

et al. 2020

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“…Lake‐marsh systems have different structures and functions during the 12 months of a year. Previous studies seek to conduct detailed environmental flow assessment for the 12 months (Artur et al, 2020; Kuriqi et al, 2020; Maihemuti et al, 2020), which could effectively improve the precision of environment flow assessment. However, the importance of environmental flow for each month is different.…”

Section: Discussionmentioning

confidence: 99%

Environmental flow assessment in a lake‐marsh system with reverse seasonal hydrological patterns

Qin

Yin

Qiu

et al. 2021

Hydrological Processes

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Environmental flow (e-flow) assessment is essential for the ecological protection and restoration of lake-marsh systems. Previous studies on e-flow assessment for lakemarsh systems focused on lake-marsh systems with natural seasonal hydrological patterns (i.e., low water level in winter and high water level in summer). However, they have not considered lake-marsh systems with reverse seasonal hydrological patterns (i.e., high water level in winter and low water level in summer). The reverse seasonal hydrological patterns impose seriously negative impacts on waterbirds, because the hydrological patterns could lead to limited plant germination in spring and massive plant death in summer, leaving few plants available as food for waterbirds in winter, and could consequently reduce the sheltering and forageable areas for waterbirds. This study took Hongze Lake Wetland National Nature Reserve in China as the study area. Based on the habitat requirements of waterbirds, the sheltering and forageable areas for waterbirds under different water-depth and aquatic plant distribution scenarios were calculated. By exploring the impacts of reverse seasonal hydrological processes on waterbird habitats, we determined the necessary e-flows for lake-marsh systems with reverse seasonal hydrological patterns to meet the needs of waterbird habitat. The results showed that the water level of Hongze Lake should be controlled to 13.0-13.1 m in March, 12.5-12.6 m in July, and 12.9-13.0 m in October, which can meet the needs of waterbirds for both shelter and foraging.

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“…Importantly, Colwell's P is maximized when environmental phenomenon is constant throughout the year, if the seasonal fluctuation is consistent across all years, or a combination of both (Tonkin et al, 2017). Following Tonkin et al (2017), we calculated seasonality as Colwell's M/P, as it can be applied in a wide range of ecological studies (Tonkin et al, 2017;Radecki-Pawlik et al, 2020;Peek et al, 2021) and provides a measure ranging from 0 to 1, with 1 being highly seasonal, of how the environment or daily flow varies within a single year.…”

Section: Calculating Delta Hydrology Using Functional Flow Metricsmentioning

confidence: 99%

Identifying Functional Flow Linkages Between Stream Alteration and Biological Stream Condition Indices Across California

Peek

Irving

Yarnell

et al. 2022

Front. Environ. Sci.

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Large state or regional environmental flow programs, such as the one based on the California Environmental Flows Framework, rely on broadly applicable relationships between flow and ecology to inform management decisions. California, despite having high flow and bioassessment data density, has not established relationships between specific elements of the annual hydrograph and biological stream condition. To address this, we spatially and temporally linked USGS gage stations and biological assessment sites in California to identify suitable paired sites for comparisons of streamflow alteration with biological condition at a statewide scale. Flows were assessed using a set of functional flow metrics that provide a comprehensive way to compare alteration and seasonal variation in streamflow across different locations. Biological response was evaluated using the California Stream Condition Index (CSCI) and Algal Stream Condition Index (ASCI), which quantify biological conditions by translating benthic invertebrate or algal resources and watershed-scale environmental data into an overall measure of stream health. These indices provide a consistent statewide standard for interpreting bioassessment data, and thus, a means of quantitatively comparing stream conditions throughout the state. The results indicate that indices of biological stream condition were most closely associated with flow alteration in seasonality and timing metrics, such as fall pulse timing, dry-season timing, and wet season timing. Magnitude metrics such as dry-season baseflow, wet season baseflow, and the fall pulse magnitude were also important in influencing biological stream conditions. Development of ecological flow needs in large-scale environmental programs should consider that alteration to any of the seasonal flow components (e.g., dry-season baseflow, fall pulse flow, wet-season baseflow, spring recession flow) may be important in restructuring biological communities.

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Seasonality of mean flows as a potential tool for the assessment of ecological processes: Mountain rivers, Polish Carpathians

Cited by 17 publications

References 81 publications

Comprehensive Evaluation of Metal Pollution in Urban Soils of a Post-Industrial City—A Case of Łódź, Poland

Comprehensive Evaluation of Metal Pollution in Urban Soils of a Post-Industrial City—A Case of Łódź, Poland

Environmental flow assessment in a lake‐marsh system with reverse seasonal hydrological patterns

Identifying Functional Flow Linkages Between Stream Alteration and Biological Stream Condition Indices Across California

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