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  1. AU="Němejcová, Denisa"
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  1. Article ; Online: Unexplored freshwater communities in post‐mining ponds: effect of different restoration approaches

    Poláková, Martina / Straka, Michal / Polášek, Marek / Němejcová, Denisa

    Restoration Ecology. 2022 Nov., v. 30, no. 8 p.e13679-

    2022  

    Abstract: Many studies examining plant and terrestrial invertebrate communities have revealed the high conservation potential of spoil heaps. On the other hand, the freshwater communities inhabiting post‐mining ponds within these human‐made habitats are almost ... ...

    Abstract Many studies examining plant and terrestrial invertebrate communities have revealed the high conservation potential of spoil heaps. On the other hand, the freshwater communities inhabiting post‐mining ponds within these human‐made habitats are almost unexplored. We focused on aquatic macroinvertebrate, zooplankton, and phytoplankton communities in the littoral zones of 24 ponds situated on spoil heaps created after lignite mining in the Czech Republic. We compared environmental factors, taxa richness, and conservation value (number of threatened aquatic macroinvertebrate species) in the ponds, based on the type of restoration approach applied, that is, technical reclamation, spontaneous succession, and their combination (semi‐spontaneous succession). While macroinvertebrate and zooplankton taxa richness did not differ significantly between the three types of pond, the phytoplankton community did, with the highest taxa richness recorded in technically established ponds. From a nature conservation point of view, the spontaneously developed ponds hosted almost twice as many threatened macroinvertebrates as the other ponds; nevertheless, even the technically constructed ponds hosted considerable populations of rare species, e.g. the regionally extinct beetle Limnebius nitidus (Marsham, 1802), and contributed to the overall conservation value of the spoil heaps. The most significant driver structuring post‐mining pond freshwater communities was the percentage of vegetation in the littoral zone.
    Keywords Coleoptera ; ecological restoration ; freshwater ; lignite ; littoral zone ; macroinvertebrates ; natural resources conservation ; phytoplankton ; rare species ; vegetation ; zooplankton ; Czech Republic
    Language English
    Dates of publication 2022-11
    Publishing place Wiley Periodicals, Inc.
    Document type Article ; Online
    Note JOURNAL ARTICLE
    ZDB-ID 914746-9
    ISSN 1526-100X ; 1061-2971
    ISSN (online) 1526-100X
    ISSN 1061-2971
    DOI 10.1111/rec.13679
    Database NAL-Catalogue (AGRICOLA)

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    In stock of ZB MED Bonn / Germany

    Z 6111: Show issues

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  2. Article ; Online: Climatically promoted taxonomic homogenization of macroinvertebrates in unaffected streams varies along the river continuum.

    Zhai, Marie / Bojková, Jindřiška / Němejcová, Denisa / Polášek, Marek / Syrovátka, Vít / Horsák, Michal

    Scientific reports

    2023  Volume 13, Issue 1, Page(s) 6292

    Abstract: Biotic homogenization appears to be a global consequence of anthropogenic change. However, the underlying environmental factors contributing to homogenization are difficult to identify because their effects usually interact and confound each other. This ... ...

    Abstract Biotic homogenization appears to be a global consequence of anthropogenic change. However, the underlying environmental factors contributing to homogenization are difficult to identify because their effects usually interact and confound each other. This can be the reason why there is very little evidence on the role of climate warming in homogenization. By analysing macroinvertebrate assemblages in 65 streams that were as close to natural conditions as possible, we avoided the confounding effects of common anthropogenic stressors. This approach resulted in revealing a significant effect of increased temperature (both summer and winter) on changes in macroinvertebrate compositional over the past two decades. However, homogenization was significant only at opposite ends of the river continuum (submontane brooks, low-altitude rivers). Surprisingly, species of native origin predominated overall, increasing in frequency and abundance ("winners"), while only a minority of species declined or disappeared ("losers"). We hypothesise that undisturbed conditions mitigate species declines and thus homogenization, and that the temperature increase has so far been beneficial to most native species. Although we may have only captured a transitional state due to extinction debt, this underscores the importance of maintaining ecological conditions in stream to prevent species loss due to climate change.
    MeSH term(s) Animals ; Invertebrates ; Ecosystem ; Rivers ; Environmental Monitoring/methods ; Climate Change
    Language English
    Publishing date 2023-04-18
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2615211-3
    ISSN 2045-2322 ; 2045-2322
    ISSN (online) 2045-2322
    ISSN 2045-2322
    DOI 10.1038/s41598-023-32806-y
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article: Recognition of stream drying based on benthic macroinvertebrates: A new tool in Central Europe

    Straka, Michal / Polášek, Marek / Syrovátka, Vít / Stubbington, Rachel / Zahrádková, Světlana / Němejcová, Denisa / Šikulová, Lenka / Řezníčková, Pavla / Opatřilová, Libuše / Datry, Thibault / Pařil, Petr

    Ecological indicators. 2019 Nov., v. 106

    2019  

    Abstract: Many streams in the extensive Central European region have an intermittent flow regime. Conventional hydrological methods used to identify zero-flow conditions, and in particular drying events, have limited use when assessing large areas dominated by low- ...

    Abstract Many streams in the extensive Central European region have an intermittent flow regime. Conventional hydrological methods used to identify zero-flow conditions, and in particular drying events, have limited use when assessing large areas dominated by low-order streams. We developed a novel multimetric index to recognise antecedent stream drying based on the analysis of benthic macroinvertebrate communities. The data used to develop the index were collected in pristine streams with different flow permanence regimes between 2012 and 2014, using standard sampling methods for ecological status assessment. The data include 64 perennial, 19 near-perennial and 27 intermittent benthic macroinvertebrate samples. Metrics considered for the index included variables based on (i) the occurrence of indicator taxa, (ii) the proportion of biological and ecological traits, and (iii) structural community metrics. Linear discriminant analysis identified the metric combinations that best discriminated among the three flow permanence categories. Different metrics were used in the final multimetric index calculation for the autumn and spring season that followed stream drying. In both seasons, the index included the proportion of indicator taxa and the proportion of taxa with high body flexibility. In addition, the autumn index included the proportion of taxa with a preference for organic substrates, whereas in spring the index included total abundance. Independent data from regulatory monitoring activity were used to validate the accuracy of the index. The correct classification of independent samples was 92% and 96% for samples from perennial and non-perennial sites, respectively. The index can be calculated using data collected by routine monitoring programmes used to assess ecological status and provides information about stream intermittence where conventional hydrological monitoring is limited. As intermittent streams increase in extent in global regions including Central Europe, the tool may be of particular interest to those who use invertebrates to monitor or manage these ecosystems.
    Keywords autumn ; data collection ; discriminant analysis ; drying ; ecosystems ; environmental indicators ; ephemeral streams ; hydrology ; indicator species ; macroinvertebrates ; monitoring ; sampling ; spring ; Central European region
    Language English
    Dates of publication 2019-11
    Publishing place Elsevier Ltd
    Document type Article
    ZDB-ID 2036774-0
    ISSN 1872-7034 ; 1470-160X
    ISSN (online) 1872-7034
    ISSN 1470-160X
    DOI 10.1016/j.ecolind.2019.105486
    Database NAL-Catalogue (AGRICOLA)

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    In stock of ZB MED Bonn / Germany

    Z 7436: Show issues

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