Chara hispida beds as a sink of nitrogen: Evidence from growth, nitrogen uptake and decomposition

Rodrigo, María A.; Rojo, Carmen; Álvarez‐Cobelas, Miguel; Cirujano, Santos

doi:10.1016/j.aquabot.2007.01.007

Cited by 45 publications

(30 citation statements)

References 21 publications

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“…5A). The annual mean biomass of C. hispida in 2010 was higher than that measured for the same species in a deeper transparent lake in Spain (Rodrigo et al, 2007) and of the same order of magnitude as that found in other shallow lakes possessing abundant charophyte vegetation . C. hispida coverage changed from more than 3,000 Kg DW in summer 2009 to a maximum of greater than 12,000 Kg DW in 2010 and decreased to less than 2,000 Kg DW in June 2012 (Table 1).…”

Section: Resultsmentioning

confidence: 47%

“…The release of organic and inorganic nutrients has been considered a consequence of the senescence of submerged plant communities (Thorén et al, 2004;Rodrigo et al, 2007). In 2009-2011, however, during the autumn decay of the C. hispida meadow, the nutrient concentrations did not increase in a way that would be relevant to this hypothesis.…”

Section: Resultsmentioning

confidence: 99%

“…Moreover, charophytes and microalgae can affect each other through competition via inorganic nutrients and/or allelopathy. Charophytes have been described as a nutrient sink (Kufel and Kufel, 2002), particularly for nitrogen (Rodrigo et al, 2007). Their N uptake is very efficient, and they remove this nutrient from the water column (Rodrigo and Alonso-Guillén, 2008).…”

Section: Resultsmentioning

confidence: 99%

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The role of charophytes in a Mediterranean pond created for restoration purposes

et al. 2015

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Section: Resultsmentioning

confidence: 47%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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The role of charophytes in a Mediterranean pond created for restoration purposes

et al. 2015

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“…It probably also applies to nutrient pressures, since moderate eutrophication in some lakes in the UK has been noted to cause an increase in macrophyte species richness, with further eutrophication causing a decline. Freshwater ecosystems may show significant resilience to ecological pressures } for example, Chara beds can act as important nitrogen sinks (Rodrigo et al, 2007). On the other hand, impacted ecosystems are often relatively fragile and unstable, and may therefore be vulnerable to relatively minor human pressures during the recovery phase.…”

Section: Ecosystem Response To Pressuresmentioning

confidence: 99%

The Hitchhiker's Guide to the Water Framework Directive

Hatton-Ellis

2008

Aquatic Conservation

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In Douglas Adams' comedy novel The Hitchhiker's Guide to the Galaxy, a civilization wanted to know the ultimate answer to life, the universe and everything. They built Deep Thought, an enormous computer that, after seven and a half million years of detailed calculations, produced the answer: 42. The scientists then realized that although Deep Thought had given them the ultimate answer, they did not know the ultimate question.For all scientists, asking and answering the correct questions is fundamental to the development and application of knowledge. However, for conservation scientists there is the additional complication of translating the knowledge gained into effective policy and legislative mechanisms. These rely on effective communication and partnership working.The EC Water Framework Directive (WFD; European Commission, 2000) is an ambitious instrument of Europe-wide legislation that aims to set minimum ecological standards for surface water (including coastal waters) and groundwater by providing a unified policy approach. Unlike almost all previous legislation in the UK and elsewhere, standards are derived with respect to ecological quality rather than physico-chemical thresholds. Individual water bodies are graded into one of five quality classes (high, good, moderate, poor or bad). EU member states are required to ensure that all water bodies reach good ecological status by 2015, and that there is no deterioration from the existing ecological status. Where water bodies are degraded by human activities beyond a level that it is reasonable to expect restoration, they can be designated 'heavily modified'. However, even heavily modified water bodies are required to reach 'maximum ecological potential'.The WFD requires that each member state identify a typology for their water bodies. Types are based on fundamental ecological drivers such as altitude and geology, and their ecological quality is then compared with a 'type-specific reference condition'. Different biological, hydromorphological and physico-chemical 'quality elements' may be used, as appropriate for the habitat type being monitored. A series of generic metrics of environmental quality are identified in the Directive, mainly related to taxon richness and abundance. These are then used to grade the ecological quality of each water body by comparing it with a reference condition using an Ecological Quality Ratio (EQR). The EQR is calculated by dividing the observed metric by the reference value for that metric. The range of EQRs is then divided into five classes ranging from high to bad ecological status. Class status is on a 'one-out, all-out' basis, i.e. the quality element with the worst ecological quality is used to determine ecological class } however, in many water bodies only a single biological quality element } that perceived as being 'most sensitive' to the predominant pressure } needs to be monitored. As a control to ensure that the approach is applied evenly across the EU, an intercalibration process takes place to compare standards of i...

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“…These algae are considered the closest living relatives of land plants (Karol et al 2001). Characeans have important ecological role in aquatic ecosystems as their assemblages are positively correlated with water transparency, they are efficient nutrient sinks and important in nutrient cycling, and they influence zooplankton and phytoplankton biomasses (Coops 2002, Kufel & Kufel 2002, Schwarz et al 2002, van Donk & van de Bund 2002, Rodrigo et al 2007). …”

Section: Introductionmentioning

confidence: 99%

The genera Chara and Nitella (Chlorophyta, Characeae) in the subtropical Itaipu Reservoir, Brazil

Meurer¹,

Bueno²

2012

Braz. J. Bot.

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-(The genera Chara and Nitella (Chlorophyta, Characeae) in the subtropical Itaipu Reservoir, Brazil). The family Characeae, represented by two genera in Brazil, Chara and Nitella, is considered to include the closest living relatives of land plants, and its members play important ecological role in aquatic ecosystems. The present taxonomic survey of Chara and Nitella was performed in tributaries that join to form the Brazilian shore of the Itaipu Reservoir on the Paraná River. Thirteen species were recorded, illustrated, and described: C. braunii var.

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Chara hispida beds as a sink of nitrogen: Evidence from growth, nitrogen uptake and decomposition

Cited by 45 publications

References 21 publications

The role of charophytes in a Mediterranean pond created for restoration purposes

The role of charophytes in a Mediterranean pond created for restoration purposes

The Hitchhiker's Guide to the Water Framework Directive

The genera Chara and Nitella (Chlorophyta, Characeae) in the subtropical Itaipu Reservoir, Brazil

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