scholarly journals Comparison of the effectiveness of kick and sweep hand net and Surber net sampling techniques used for collecting aquatic macroinvertebrate samples

2017 ◽  
Vol 69 (2) ◽  
pp. 233-238 ◽  
Author(s):  
Bojana Tubic ◽  
Natasa Popovic ◽  
Maja Rakovic ◽  
Аna Petrovic ◽  
Vladica Simic ◽  
...  
Keyword(s):  
Quantitative Method ◽  
Ecological Status ◽  
Sampling Techniques ◽  
Aquatic Macroinvertebrate ◽  
Routine Monitoring ◽  
The Status ◽  
Status Assessment ◽  
Macroinvertebrate Metrics ◽  
Assessment Sensitivity ◽  
The Eu

The objective of this work is to analyze the effectiveness of two widely used methods for collecting aquatic macroinvertebrate samples: the semiquantitative kick and sweep (K&S) and quantitative Surber net (SN) techniques. Based on our data, the methods were fully comparable as regards analysis of the macroinvertebrate metrics most often used in ecological status assessment (sensitivity/tolerance parameters), while K&S was found to be more successful in the evaluation of biodiversity. Thus, both methods could be used for routine monitoring of the status of water bodies, according to the recommendation of the EU Water Framework Directive, while for research, K&S is more advanced. K&S is also more effective timewise for material collecting. SN sampling is a quantitative method and could thus be used in studies of aquatic ecosystem productivity.

Disentangling the multiple stressors acting on stream ecosystems to support restoration priorities

2015 ◽  
Vol 72 (2) ◽  
pp. 293-302 ◽  
Author(s):  
A. Azzellino ◽  
S. Canobbio ◽  
S. Çervigen ◽  
V. Marchesi ◽  
A. Piana
Keyword(s):  
Multiple Stressors ◽  
Ecological Status ◽  
Relative Weight ◽  
Stream Ecosystems ◽  
Cost Ratio ◽  
The Status ◽  
Regression Techniques ◽  
Good Ecological Status ◽  
Economic Considerations ◽  
The Eu

Stream ecosystems may suffer from the effects of multiple stressors. Planning restoration actions without knowing the relative weight of each stressor might lead to disproportionately costly or ecologically meaningless measures. This is particularly relevant under the EU Water Framework Directive where economic considerations play a role in justifying exemptions from the overarching aim of the directive of achieving the good ecological status in all the EU water bodies by 2015. In this study, we correlated the status of macroinvertebrate assemblages with many environmental variables at 120 monitoring stations (surveyed in 2009–2011) in the streams of Lombardy, Italy. We used a combination of regression techniques to disentangle the effects of the different stressors. Furthermore, different profiles of ecological quality were associated with the dominant stressors. Finally, examples are given about how these study findings provide elements to identify restoration scenarios that maximize the effectiveness/cost ratio.

scholarly journals Indicator-based status assessment of commercial fish species in the North Sea according to the EU Marine Strategy Framework Directive (MSFD)

2013 ◽  
Vol 70 (3) ◽  
pp. 694-706 ◽  
Author(s):  
Wolfgang Nikolaus Probst ◽  
Matthias Kloppmann ◽  
Gerd Kraus
Keyword(s):  
North Sea ◽  
Fish Species ◽  
Marine Strategy Framework Directive ◽  
Commercial Fish ◽  
Fish Stocks ◽  
The North ◽  
The Status ◽  
Status Assessment ◽  
The North Sea ◽  
The Eu

Abstract Probst, W. N., Kloppmann, M., and Kraus, G. Indicator-based status assessment of commercial fish species in the North Sea according to the EU Marine Strategy Framework Directive (MSFD). – ICES Journal of Marine Science, 70: 694–706. The EU Marine Strategy Framework Directive (MSFD) is structured into eleven descriptors of good environmental status (GES). For each descriptor the current status of the marine environment should be assessed against its GES using ecosystem criteria and indicators. Within Descriptor 3 (D3) the MSFD addresses the status of exploited fish stocks according to three criteria (exploitation rate, stock size and size structure). This study performed an MSFD-compliant assessment of exploited fish stocks in the North Sea by aggregating data from analytical stock assessments and scientific research surveys to calculate indicator metrics for each criterion within each stock time-series. A stock achieved GES, when each indicator for each criterion had a good status. Of 43 assessed fish stock suggested by the EU Data Collection Framework, 63% (27) achieved GES. Though the MSFD explicitly demands that all exploited fish stocks achieve GES, this demand may be challenged by reality, because the status of exploited stocks depends not only on fishing impacts, but also on environmental conditions and ecological interactions. Therefore an alternative approach based on binomial distributions is presented to define limits for GES at the descriptor level. The implications and pitfalls of the applied assessment methods are discussed.

scholarly journals The status assessment of Corynandra viscosa subsp. nagarjunakondensis (Magnoliopsida: Cleomaceae), endemic to Nagarjunakonda, Andhra Pradesh, India

2018 ◽  
Vol 10 (9) ◽  
pp. 12210
Author(s):  
Veeravarapu Hanumantha Rao ◽  
Vaidyula Vasudeva Rao ◽  
Anuti Baleeshwar Reddy ◽  
Vatsavaya Satyanarayana Raju
Keyword(s):  
Water Body ◽  
Andhra Pradesh ◽  
Ecological Status ◽  
Threat Assessment ◽  
Southern India ◽  
Flowering Plant ◽  
Area Of Occupancy ◽  
The Status ◽  
Status Assessment ◽  
Plant Taxon

Corynandra viscosa subsp. nagarjunakondensis (Cleomaceae), a flowering plant taxon endemic to Nagarjunkonda of Krishna River Valley, Andhra Pradesh, southern India was assessed for its ecological status.  The distribution of this species was mapped, population estimated and the impending threats ascertained.  The extent of its area of spread is primarily limited by the water body (Nagarjunasagar) created by the impounding waters when a dam was constructed across the River Krishna at the site of its occurrence. The extent of occurrence (EOO) and the area of occupancy (AOO) of this taxon were estimated to be 0.20 km2 and 0.31 km2, respectively.  The threat assessment places the taxon in the Critically Endangered [B1ab(iii)] category. 

In or Out?

2018 ◽  
Author(s):  
Catherine E. De Vries
Keyword(s):  
Public Opinion ◽  
Status Quo ◽  
Data Sources ◽  
Fine Grained ◽  
Alternative State ◽  
Empirical Measurement ◽  
The Status ◽  
People’S Attitudes ◽  
Over Time ◽  
The Eu

This chapter introduces a benchmark theory of public opinion towards European integration. Rather than relying on generic labels like support or scepticism, the chapter suggests that public opinion towards the EU is both multidimensional and multilevel in nature. People’s attitudes towards Europe are essentially based on a comparison between the benefits of the status quo of membership and those associated with an alternative state, namely one’s country being outside the EU. This comparison is coined the ‘EU differential’. When comparing these benefits, people rely on both their evaluations of the outcomes (policy evaluations) and the system that produces them (regime evaluations). This chapter presents a fine-grained conceptualization of what it means to be an EU supporter or Eurosceptic; it also designs a careful empirical measurement strategy to capture variation, both cross-nationally and over time. The chapter cross-validates these measures against a variety of existing and newly developed data sources.

scholarly journals How to Assess the Ecological Status of Highly Humic Lakes? Development of a New Method Based on Benthic Invertebrates

Water ◽  
2021 ◽  
Vol 13 (2) ◽  
pp. 223
Author(s):  
Dāvis Ozoliņš ◽  
Agnija Skuja ◽  
Jolanta Jēkabsone ◽  
Ilga Kokorite ◽  
Andris Avotins ◽  
...  
Keyword(s):  
Ecological Status ◽  
Working Party ◽  
Nutrient Content ◽  
Humic Lakes ◽  
Raised Bog ◽  
Raised Bogs ◽  
Taxa Richness ◽  
Bog Lakes ◽  
Status Assessment

Highly humic lakes are typical for the boreal zone. These unique ecosystems are characterised as relatively undisturbed habitats with brown water, high acidity, low nutrient content and lack of macrophytes. Current lake assessment methods are not appropriate for ecological assessment of highly humic lakes because of their unique properties and differing human pressures acting on these ecosystems. This study proposes a new approach suitable for the ecological status assessment of highly humic lakes impacted by hydrological modifications. Altogether, 52 macroinvertebrate samples from 15 raised bog lakes were used to develop the method. The studied lakes are located in the raised bogs at the central and eastern parts of Latvia. Altered water level was found as the main threat to the humic lake habitats since no other pressures were established. A multimetric index based on macroinvertebrate abundance, littoral and profundal preferences, Coleoptera taxa richness and the Biological Monitoring Working Party (BMWP) Score is suggested as the most suitable tool to assess the ecological quality of the highly humic lakes.

scholarly journals Land-use and agriculture in Denmark around year 1900 and the quest for EU Water Framework Directive reference conditions in coastal waters

AMBIO ◽  
2021 ◽  
Author(s):  
Bent T. Christensen ◽  
Birger F. Pedersen ◽  
Jørgen E. Olesen ◽  
Jørgen Eriksen
Keyword(s):  
Land Use ◽  
Water Framework Directive ◽  
Coastal Waters ◽  
Root Zone ◽  
Reference Conditions ◽  
Ecological Status ◽  
Agricultural Activity ◽  
Eu Water Framework Directive ◽  
Alternative Approach ◽  
The Eu

AbstractThe EU Water Framework Directive (WFD) aims to protect the ecological status of coastal waters. To establish acceptable boundaries between good and moderate ecological status, the WFD calls for reference conditions practically undisturbed by human impact. For Denmark, the nitrogen (N) concentrations present around year 1900 have been suggested to represent reference conditions. As the N load of coastal waters relates closely to runoff from land, any reduction in load links to agricultural activity. We challenge the current use of historical N balances to establish WFD reference conditions and initiate an alternative approach based on parish-level land-use statistics collected 1896/1900 and N concentrations in root zone percolates from experiments with year 1900-relevant management. This approach may be more widely applicable for landscapes with detailed historic information on agricultural activity. Using this approach, we find an average N concentration in root zone percolates that is close to that of current agriculture. Thus, considering Danish coastal waters to be practically unaffected by human activity around year 1900 remains futile as 75% of the land area was subject to agricultural activity with a substantial potential for N loss to the environment. It appears unlikely that the ecological state of coastal waters around year 1900 may serve as WFD reference condition.

Regulating Proxy Advisors Through Transparency: Pros and Cons of the EU Approach

2017 ◽  
Vol 14 (1) ◽  
pp. 1-36 ◽  
Author(s):  
Gaia Balp
Keyword(s):  
Status Quo ◽  
Legislative Process ◽  
European Regulation ◽  
The Us ◽  
The Status ◽  
Pros And Cons ◽  
Proxy Advisors ◽  
Legal Constraints ◽  
The Eu

This article outlines potential pros and cons of a future European regulation of proxy advisory firms, as set forth in the Commission’s Proposal for a Directive amending Directive 2007/36/EC. After summarizing criticisms concerning the proxy advisory industry, and findings regarding its de facto influence on investors’ voting conduct both in the US and in the European context, the article adverts to why the power of proxy advisors appears to be overestimated. Uncertainty on the status quo of the industry’s actual impact on key decisions in listed companies, as well as costs associated with a regulation, need to be considered for assessing the suitability of the rules drafted to ensure adequate levels of independence and quality of voting recommendations. While transparency rules may be preferred to stricter legal constraints or requirements in a first stage, possible shortcomings of the Draft Directive exist that may undermine its effectiveness. Analyzing the amendments to the Proposal adopted by the European Parliament, and the Council’s Presidency compromise text, may suggest a preferable approach as regards single rules still making their way through the European legislative process.

scholarly journals Applicability of diatom metabarcoding in the ecological status assessment of Hungarian lotic and soda pan habitats

2021 ◽  
Vol 130 ◽  
pp. 108105
Author(s):  
Mónika Duleba ◽  
Angéla Földi ◽  
Adrienn Micsinai ◽  
Gábor Várbíró ◽  
Anita Mohr ◽  
...  
Keyword(s):  
Ecological Status ◽  
Ecological Status Assessment ◽  
Status Assessment ◽  
Soda Pan
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