Vegetation–environment relationships in irrigation channel systems of southern Argentina

Sabbatini, Mario Ricardo; Murphy, K. J.; Irigoyen, J. H.

doi:10.1016/s0304-3770(97)00086-7

Cited by 29 publications

(14 citation statements)

References 18 publications

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“…Several studies have shown that ammonium concentrations and phosphates in water affect the composition in aquatic plant communities and ammonium ion is the preferred nitrogen source for plant growth (Bornette & Puijalon 2011). Electrical conductivity (Ferreira et al 1998;Sabbatini et al 1998;Dorotovičová 2013;Manolaki & Papastergiadou 2015) and water pH (Ferreira et al 1998) are often discussed as other chemical variables influencing the occurrence of aquatic plants. An intensive application of pesticides, sewage and industrial effluents from towns and cities are the main sources of organic pollution.…”

Section: Discussionmentioning

confidence: 99%

The relationship between macrophyte assemblages and environmental variables in drainage and irrigation canals in Slovakia

Baláži

Hrivnák

2016

Biologia

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Our study provides new knowledge about macrophyte assemblages and environmental variables of Slovak drainage and irrigation canals. The canal system, comprising ca. 15% of all flows in Slovakia, is one of the oldest in Central Europe. This information represents a first step toward exploitation of macrophytes as an obligatory biological quality element for the assessment of ecological potential according to the requirements of the Water Framework Directive. Among 61 canals studied, a total of 85 aquatic plant species (35 hydrophytes, 16 amphiphytes and 34 helophytes) were recorded during the years 2012-2014, including three neophytes and 18 threatened species. Physico-chemical variables explained the highest proportion of species variability, whilst hydromorphological variables and landscape variables were much less significant. Chemical oxygen demand, ammonium nitrogen, electrical conductivity, water pH, flow velocity and water depth were identified as most important drivers of species composition of aquatic macrophytes and explained 21.1% of the variability. The CCA results revealed differences in species composition of canals reflecting the geographical origin and environmental conditions as well, relating to South-Eastern and South-Western Slovakia. In conclusion, macrophytes in drainage and irrigation canals are able to reflect several environmental variables and might provide valuable information for bioindication in assessing the ecological potential.

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Section: Discussionmentioning

confidence: 99%

The relationship between macrophyte assemblages and environmental variables in drainage and irrigation canals in Slovakia

Baláži

Hrivnák

2016

Biologia

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“…Temperature, conductivity and pH were recorded using a Schott Handylab pH/LF 12 meter. Underwater light (as photosynthetically active radiation: PAR lmol s -1 m -2 ) was measured using a Skye SKP210 PAR meter to determine values of light attenuation [k, m -1 : calculated according to Moss, 1988], euphotic depth [Z eu , m] (calculated as 3% of surface light, for submerged macrophytes), and ratio of Z eu :D an indication of whether light reaches the bed of the stream (Sabbatini et al, 1998). Mean % shade was used to quantify the reduction in incoming light caused by terrestrial bankside vegetation.…”

Section: Study Areas and Sampling Sitesmentioning

confidence: 99%

Environmental drivers, life strategies and bioindicator capacity of bryophyte communities in high-latitude headwater streams

Lang

Murphy

2011

Hydrobiologia

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This study reports an investigation of the bryophyte ecology of minimally impacted high-latitude headwater streams, to assess the hypothesis that underlying geology, water physico-chemistry, current velocity and substrate morphology are significant environmental drivers of the species distribution, community composition and abundance of bryophyte vegetation in these naturally highly stressed and disturbed upland ecosystems. Our secondary aim was to determine whether there is evidence that the assemblage and functional attributes of the species present have potential as indicators of water quality and habitat biointegrity in high-latitude headwater streams. The methodology involved repeated intensive surveys, during 2005-2006, at nine sites located on three streams of contrasting underlying geology, within latitudes 56°-58°N, in upland Scotland. Using a stratified random sampling design, quantitative assessments were made of 5 stream vegetation parameters and 52 environmental variables potentially influencing the target sites. TWINSPAN classification, supported by CCA ordination, of the dataset identified four stream bryophyte community types, plus a fifth sample group (characterized by unstable habitat conditions) devoid of bryophytes. The environmental drivers of the vegetation community were primarily associated with streambed stability (flow, substrate composition) and water chemistry (e.g. pH, conductivity, Ca 2? ), which were products of the prevailing underlying geology. The abundance of stream bryophytes was generally a function of predominant growth morphology and life strategy of the species present. Two bryophyte assemblages were identified as characterizing either upland oligotrophic stream habitats of acid-sensitive and base-poor waters (indicators: Scapania undulata, Hygrohypnum ochraceum), or calcareous and mineral-rich streamwaters (indicators: Chiloscyphus polyanthus, Hygrohypnum luridum). The results support the incorporation of bryophytes into river biomonitoring schemes, for use in high-latitude upland streams.

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“…Once established, disturbances that can fragment plants, such as harvesting, mowing, chaining, or the rapid rise and fall of water level, will favour the growth and spread of this species. Myriophyllum aquaticum is tolerant to mechanical disturbances and the repeated occurrence of these events favours dominance in canals (Sabbatini et al. , 1998).…”

Section: Introductionmentioning

confidence: 99%

Comparative effects of water level variations on growth characteristics of Myriophyllum aquaticum

Wersal

Madsen

2011

Weed Research

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Wersal RM & Madsen JD (2011). Comparative effects of water level variations on growth characteristics of Myriophyllum aquaticum. Weed Research 51, 386–393. Summary Myriophyllum aquaticum is a non‐native aquatic plant that has invaded a range of habitats in the United States and Europe. Myriophyllum aquaticum reduces native species richness at local scales, water quality, habitat quality for fish and wildlife and impacts on human uses. Despite the submersed leaf form, M. aquaticum is not typically a weed problem as water level increases, although little data exist describing basic biological and ecological mechanisms affecting growth. The objective of this study was to quantify changes in M. aquaticum growth as water levels increase from 0 (representing shoreline habitat) to 137 cm under controlled mesocosm conditions. Total biomass at 0 cm was 96% greater than plants grown at a depth of 137 cm. Biomass of emergent shoots, stolons and roots were also greater when M. aquaticum was grown at the 0 cm water level. Submersed shoot biomass was on average 99% greater between 37 and 77 cm. Submersed shoots comprised a small fraction, 0.1–12% of total biomass, depending on water level. Total plant length was 25% greater when plants were grown at water levels from 0 to 77 cm, compared with plants grown at 97, 117 or 137 cm. Nuisance growth is dependent upon plants emerging from the water column; as water levels increase, this becomes more difficult for plants, as a result of the reduced photosynthetic ability of submersed leaves. These results can be used to identify optimal areas for M. aquaticum growth and possibly predict areas of new infestations.

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Vegetation–environment relationships in irrigation channel systems of southern Argentina

Cited by 29 publications

References 18 publications

The relationship between macrophyte assemblages and environmental variables in drainage and irrigation canals in Slovakia

The relationship between macrophyte assemblages and environmental variables in drainage and irrigation canals in Slovakia

Environmental drivers, life strategies and bioindicator capacity of bryophyte communities in high-latitude headwater streams

Comparative effects of water level variations on growth characteristics of Myriophyllum aquaticum

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