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  • 1
    Electronic Resource
    Electronic Resource
    The influence of channelisation on riparian plant assemblages (2005)
    Oxford, UK : Blackwell Science Ltd
    Freshwater biology 50 (2005), S. 0 
    Details
    ISSN: 1365-2427
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: 1. A comparative study of species diversity and assemblage patterns of herbaceous ground-flora communities in riparian areas was performed along natural mid-sized lowland streams and their channelised counterparts. The areas had open vegetation and were positioned along 18 similar-sized third to fourth order stream reaches.2. Alpha diversity was significantly higher along natural streams both at the sample plot and reach scale. Sample plot diversity peaked at intermediate distance from the natural stream reaches, whereas it increased with increasing distance from the channelised reaches. Both gamma diversity, measured and estimated from species-area curves, and beta diversity, which is a measure of the change in diversity between areas, was similar along the two types of streams.3. Alpha diversity correlated with several of the measured and calibrated environmental variables. The positive correlation between bank slope and alpha diversity indicates that flooding plays a key role in maintaining high levels of diversity along natural streams.4. Species composition varied significantly between the two stream types. A cluster analysis identified four clusters of which two clusters (one and three) primarily included species associated with sample plots in areas along natural streams. Most cluster one and three species were also identified as indicator species for this stream type.5. Canonical correspondence analysis revealed that cluster one species were less productive species associated with high total soil carbon and nitrogen contents, whereas cluster three species were highly productive species associated with high soil moisture levels, probably partly resulting from flooding. Our results suggest that distance from the stream channel imposes a probabilistic gradient that sustains co-occurrence of these two communities in riparian areas along natural mid-sized lowland streams.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2427.2005.01383.x
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Effect of wave exposure on vegetation abundance, richness and depth distribution of shallow water plants in a New Zealand lake (2003)
    Oxford, UK : Blackwell Science Ltd
    Freshwater biology 48 (2003), S. 0 
    Details
    ISSN: 1365-2427
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: SUMMARY 1. The effects of physical disturbance in terms of wave exposure, shore slope and substrate mobility on the presence, species richness, cover and depth limits of the low-growing, shallow water macrophyte community (called the low mixed community) were examined at 41 shore sites in Lake Wanaka, South Island, New Zealand.2. Wave exposure at a site was described by the previous year's maximum depth of sediment motion and maximum vertical extension of waves, determined from a computer wave model. Shore slope at each site was recorded from −1 to 0 m depth, and sediment stability was assessed as the cover of small gravel.3. The low mixed community was only present on sites where the previous year's maximum depth of sediment motion was 〈8 m, maximum wave run-up was 〈0.3 m, shore slope 〈0.12 m m−1, and small gravel cover 〈78%.4. Species richness, cover and depth limits of the low mixed community decreased with increasing disturbance on the sites. Sixty-two percentage of the variation in species richness could be explained by physical disturbance variables when all sites were included (N=41). When only sites with a low mixed community were included (N=22), only 18% of the variation was explained. Species richness within sites supporting a low mixed community is thus poorly explained by physical disturbance, whereas presence or absence is better explained. There was no evidence to support the intermediate disturbance hypothesis in this study.5. Disturbance as a result of waves explained 86% of the variation in cover among sites with a low mixed community and accounted for 68 and 58% of the variation in upper and lower depth limit of the low mixed community, respectively.6. The models obtained in this study can be used as predictive models for the low mixed community in New Zealand lakes in relation to natural physical disturbance on the shore. By integrating these results with previous studies on the effect of water level fluctuation, we describe a generalised optimum physical habitat for the low mixed community in New Zealand lakes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2427.2003.00974.x
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Macrophyte diversity and composition in relation to substratum characteristics in regulated and unregulated Danish streams (1999)
    Oxford, UK : Blackwell Science Ltd
    Freshwater biology 42 (1999), S. 0 
    Details
    ISSN: 1365-2427
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: 1. The objective of the present study was to examine how the physical stream environment in regulated and unregulated lowland streams affects the diversity and distribution of macrophyte communities. We analysed the abundance, distribution and composition of macrophytes, together with physical parameters, in seven regulated and seven unregulated unshaded Danish stream reaches.2. Total macrophyte coverage was similar in the regulated and unregulated streams, but species richness and Shannon diversity were higher in the unregulated streams. Overall, we found fifty-two different species in the regulated stream reaches and sixty-two in the unregulated stream reaches. The spatial distribution of macrophytes on the stream bottom was more heterogeneous in the unregulated streams.3. We found positive correlations between the coverage and diversity of macrophytes and the coverage of coarse-textured substratum types on the stream bottom, as well as between macrophyte coverage and diversity and substratum heterogeneity. We also found that the macrophytes were more heterogeneously distributed where substratum heterogeneity was greater.4. The species growing both submerged and emergent were more abundant in the regulated streams, whereas species growing only submerged were more abundant in the unregulated streams. Species growing submerged, species growing both submerged and emergent, and species only growing emergent segregated differently in a canonical correspondence analysis ordination. The submerged species were primarily associated with coarser-textured substrata, whereas species growing both submerged and emergent, and species growing only emergent were associated with finer-textured substrata.5. The most abundant species in the regulated streams, Sparganium emersum, accounting for almost one-third of the total macrophyte coverage, was primarily associated with clay and sandy bottom substrata, whereas the most abundant species in the unregulated streams, Batrachium peltatum, was primarily associated with gravel and stony substrata.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2427.1999.444487.x
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Historical changes in species composition and richness accompanying perturbation and eutrophication of Danish lowland streams over 100 years (2001)
    Oxford, UK : Blackwell Science Ltd
    Freshwater biology 46 (2001), S. 0 
    Details
    ISSN: 1365-2427
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: 1. European lowland streams have experienced increased perturbation and eutrophication during the past 100 years. We use archive information from 27 Danish stream sites around 1896 and new data from 208 stream sites in 1996 to evaluate the accompanying changes in stream vegetation. Among the stream sites, 13 were both studied in 1896 and 1996. 
2. The species richness of submerged plants has declined profoundly over the 100-year period, particularly among the large group of Potamogeton species. This is evident both from the direct comparison of the 13 stream reaches included in both studies, and from the general comparison of all stream reaches included in the two studies. 
3. The Potamogeton vegetation has become less diverse, and is now dominated by species resistant to frequent disturbance through a high dispersal capacity. Potamogeton species, adapted to eutrophic conditions, have also increased relative to species more typical of oligotrophic conditions over this period. The dominant submerged species in the contemporary stream vegetation generally show a high capacity for dispersal and regrowth of detached shoots. 
4. The decline of species richness in Danish streams can be partly explained by a decline in the species richness in lakes in the stream system. The rich vegetation observed downstream of lakes in the past has mostly disappeared due to loss of the vegetation in the now eutrophic lakes and increasing turbidity downstream. 
5. The overall decline in richness, and the directional change in dominance patterns among stream species, can thus be explained by the loss of suitable habitats and the strong anthropogenic impacts, which have driven several European aquatic species close to extinction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2427.2001.00656.x
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    Paper (German National Licenses)
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  • 5
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    Stream water chemistry and landscape characteristics in Zackenberg Valley, NE Greenland summer 2021 (2023)
    PANGAEA
    Details
    Publication Date: 2024-03-22
    Description: The data contains water chemistry and spectral catchment NDVI for 14 streams in Zackenberg Valley in Northeast Greenland, sampled summer 2021 from 10th July to 15th September. We collected water samples for measuring water chemistry, and we determined landscape parameters using GIS based tools. The data was collected at three sampling periods in summer 2021 in the Zackenberg Research Station (74°28'N, 20°34'W). The area has a polar tundra climate with mean annual air temperature of -9.1 °C. Water chemistry (i.e. dissolved and particulate nitrogen, phosphorus, carbon; dissolved iron and silicate) and catchment characteristics (i.e. catchment area, altitude, slope, aspect, NDVI, snow cover) was measured for each of the 14 stream sites. Water chemistry samples were collected and analyzed using standard methods, and landscape characteristics were determined using GIS resources. The data was collected in order to study relationships between landscape characteristics and stream water chemistry. The water samples were collected by a team of two people, and the detailed methods are given below.
    Keywords: A; Ammonium; Ammonium/Nitrogen, inorganic, dissolved ratio; Arctic; Aspect; Calcium/Magnesium ratio; Calculated; Carbon, organic, dissolved; Catchment area; Conductivity, specific; Conductivity Meter, WTW, ProfiLine Cond 3110; Date/Time of event; Discharge; Elevation of event; Event label; G; Greening; Inductively Coupled Plasma - Mass Spectrometry (ICP-MS), PerkinElmer Instruments, Optima 2000 DV; Iron; J1; J2; KA; KC; Lachat QuickChem 8500 flow injection autoanalyser; Latitude of event; Longitude of event; LT; Month; MULT; Multiple investigations; Nitrate; Nitrate/Ammonium ratio; Nitrate/Nitrogen, inorganic, dissolved ratio; Nitrogen; Nitrogen, inorganic, dissolved; Nitrogen, inorganic, dissolved/Nitrogen, organic, dissolved ratio; Nitrogen, inorganic, dissolved/Nitrogen, total, dissolved ratio; Nitrogen, organic, dissolved; Nitrogen, total dissolved; Normalized Differenced Vegetation Index, median; Normalized Difference Vegetation Index; P; Potassium/Silicon ratio; rivers; Silicon; Site; Slope; Snow coverage; streams; Sum cations; T; Temperature, water; Total organic carbon analyzer(TOC-VCPH/TNM-1), Shimadzu; W1; W2; W3; W4; W5; water chemistry; Zackenberg_AugA; Zackenberg_AugG; Zackenberg_AugJ1; Zackenberg_AugJ2; Zackenberg_AugKA; Zackenberg_AugKC; Zackenberg_AugLT; Zackenberg_AugP; Zackenberg_AugT; Zackenberg_AugW1; Zackenberg_AugW5; Zackenberg_JulyA; Zackenberg_JulyG; Zackenberg_JulyJ1; Zackenberg_JulyJ2; Zackenberg_JulyKA; Zackenberg_JulyKC; Zackenberg_JulyLT; Zackenberg_JulyP; Zackenberg_JulyT; Zackenberg_JulyW1; Zackenberg_JulyW2; Zackenberg_JulyW3; Zackenberg_SeptA; Zackenberg_SeptG; Zackenberg_SeptKA; Zackenberg_SeptKC; Zackenberg_SeptKC2; Zackenberg_SeptT; Zackenberg_SeptW1; Zackenberg_SeptW2; Zackenberg_SeptW3; Zackenberg_SeptW4; Zackenberg_SeptW5; Zackenberg, Northeast Greenland
    Type: Dataset
    Format: text/tab-separated-values, 950 data points
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    DATA PANGAEA
  • 6
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    N water chemistry from small Arctic streams in relation to vegetation cover (2024)
    PANGAEA
    Details
    Publication Date: 2024-04-27
    Description: In the Arctic, little information is available, especially in terms of N availability and composition (i.e., nitrate, ammonium, and dissolved organic nitrogen) from small, flowing waters. This data set aims to quantify N concentrations across small Arctic streams and explore the link between terrestrial vegetation and stream water N concentration. The data set is the result of a literature study where data on N water chemistry was collected and combined from peer-reviewed, published articles and data sets selected by specific criteria. 20 articles met the selected criteria along with four datasets from databases resulting in a total of 2381 observations on N water chemistry from Arctic flowing waters from 1996 to 2021. Bioclimate subzones, NDVI and phytomass describe vegetation. Data on dissolved organic nitrogen (DON) was scarce: only 161 of the 2381 observations contained DON data. We found that nitrate (NO3-), ammonium (NH4+) and DON ranged undetectable to 1155, 547 and 1587 µg N/l, respectively. We found that sparsely vegetated areas had higher stream water N-concentrations, while barren areas and higher vegetated areas had lower stream water N-concentrations.
    Keywords: Ammonium; Ammonium/Nitrate ratio; Arctic; Arctic_streams; Area/locality; Biomass, aboveground; Category; Country; Date; Description; Identification; LATITUDE; Literature based; LONGITUDE; Month; Name; Nitrate; Nitrogen; Nitrogen, inorganic, dissolved; Nitrogen, inorganic, dissolved/Nitrogen, organic, dissolved ratio; Nitrogen, organic, dissolved; Nitrogen, total dissolved; Normalized Difference Vegetation Index; Organic carbon, soil; Precipitation, annual mean; Reference/source; streams; Subzone; Temperature, air, annual mean; Temperature, air, maximum; Temperature, air, minimum; Temperature, annual mean; Uniform resource locator/link to reference; Water sample; WS; Year of publication; Year of sampling
    Type: Dataset
    Format: text/tab-separated-values, 65302 data points
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    DATA PANGAEA
  • 7
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    Hydrological and environmental variables outperform spatial factors in structuring species, trait composition, and beta diversity of pelagic algae (2018)
    Wiley
    In:  Ecology and Evolution, 8 (5). pp. 2947-2961.
    Details
    Publication Date: 2021-02-08
    Description: There has been increasing interest in algae-based bioassessment, particularly, trait-based approaches are increasingly suggested. However, the main drivers, especially the contribution of hydrological variables, of species composition, trait composition, and beta diversity of algae communities are less studied. To link species and trait composition to multiple factors (i.e., hydrological variables, local environmental variables, and spatial factors) that potentially control species occurrence/abundance and to determine their relative roles in shaping species composition, trait composition, and beta diversities of pelagic algae communities, samples were collected from a German lowland catchment, where a well-proven ecohydrological modeling enabled to predict long-term discharges at each sampling site. Both trait and species composition showed significant correlations with hydrological, environmental, and spatial variables, and variation partitioning revealed that the hydrological and local environmental variables outperformed spatial variables. A higher variation of trait composition (57.0%) than species composition (37.5%) could be explained by abiotic factors. Mantel tests showed that both species and trait-based beta diversities were mostly related to hydrological and environmental heterogeneity with hydrological contributing more than environmental variables, while purely spatial impact was less important. Our findings revealed the relative importance of hydrological variables in shaping pelagic algae community and their spatial patterns of beta diversities, emphasizing the need to include hydrological variables in long-term biomonitoring campaigns and biodiversity conservation or restoration. A key implication for biodiversity conservation was that maintaining the instream flow regime and keeping various habitats among rivers are of vital importance. However, further investigations at multispatial and temporal scales are greatly needed.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1002/ece3.3903
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    OceanRep: Article in a Scientific Journal - peer-reviewed
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