Fish zonation and indicator species for the evaluation of the ecological status of rivers: example of the Loire basin (France)

2007 ◽  
Vol 23 (8) ◽  
pp. 877-890 ◽  
Author(s):  
Emilien Lasne ◽  
Benjamin Bergerot ◽  
Sovan Lek ◽  
Pascal Laffaille
Keyword(s):  
Indicator Species ◽  
Ecological Status ◽  
Loire Basin

Molluscan indicator species and their potential use in ecological status assessment using species distribution modeling

2018 ◽  
Vol 140 ◽  
pp. 10-17 ◽  
Author(s):  
Manos L. Moraitis ◽  
Irini Tsikopoulou ◽  
Antonios Geropoulos ◽  
Panagiotis D. Dimitriou ◽  
Nafsika Papageorgiou ◽  
...  
Keyword(s):  
Species Distribution ◽  
Indicator Species ◽  
Species Distribution Modeling ◽  
Ecological Status ◽  
Distribution Modeling ◽  
Ecological Status Assessment ◽  
Status Assessment ◽  
Potential Use

scholarly journals Do benthic diatom assemblages reflect abiotic typology: a case study of Croatian streams and rivers

2017 ◽  
Vol 76 (1) ◽  
pp. 80-90
Author(s):  
Koraljka Kralj Borojević ◽  
Marija Gligora Udovič ◽  
Petar Žutinić ◽  
Gábor Várbíró ◽  
Anđelka Plenković-Moraj
Keyword(s):  
Indicator Species ◽  
Ecological Status ◽  
Benthic Diatoms ◽  
Specific Reference ◽  
Running Waters ◽  
Self Organizing Map ◽  
Diatom Assemblages ◽  
Principal Coordinates Analysis ◽  
Principal Coordinates ◽  
Rivers And Streams

Abstract Benthic diatoms are widely used in Europe and worldwide to access ecological status of running waters. One of key goals of Water Framework Directive is to classify rivers and streams using biological quality elements and type specific reference conditions. According to system B which incorporates additional abiotic descriptors, there are 24 water types in Croatia. For biological analyses 92 rivers and streams with 140 sampling points were chosen and sampled for benthic diatoms and water chemistry simultaneously. Self organizing map (SOM) analysis was used to define biotypes from species composition and abundance of benthic diatoms. Grouping of samples in SOM resulted in 10 distinctive groups. Based on their geographical position and site characteristics, groups represent sites with similar properties (as waterbed, catchment size, altitude, size of stream) belonging to different ecoregions in Croatia. Analysis of variance revealed statistically significant differences (p<0.05) among SOM groups concerning ammonia, nitrates and total phosphorus. Indicator species analysis (IndVal) singled out species that were significantly characteristic (p<0.05) for SOM and abiotic types. Compared to abiotic groups, in which 7 out of 24 have no indicator species, all SOM groups have one or several characteristic diatom species, thus indicating diatom assemblages as valuable site descriptors. Canonical analysis of principal coordinates analysis also indicated that SOM grouping of samples is statistically reliable. Grouping of similar sites, although placed into different abiotic types, makes SOM groups with its corresponding representative species an easy tool for water quality assessment and description of reference assemblage.

IDENTIFYING THE MOST SUITABLE AREAS FOR SURFACE FLOW WETLAND CONSTRUCTION IN LITHUANIA

2015 ◽  
Author(s):  
Antanas DUMBRAUSKAS ◽  
Nijolė BASTIENĖ ◽  
Petras PUNYS
Keyword(s):  
Constructed Wetlands ◽  
Ecological Status ◽  
Surface Flow ◽  
Gis Analysis ◽  
Proximity Analysis ◽  
Wetland Construction ◽  
The Mean ◽  
Two Phases ◽  
Terrain Features ◽  
Surface Flow Constructed Wetlands

GIS-based approach to find the suitable sites for surface flow constructed wetlands was employed for the Lithuanian river basins with low ecological status. According to the nature of the analysed criteria the flowchart consists of two phases. Criteria used include hydrographical network, soil properties, terrain features, land use, etc. Some of them have strictly defined values (constraints), and other ranges within certain limits (factors). Limited criteria were analysed using rejection principle and influencing factors using proximity analysis and overlay methods. Selecting the potential sites using standard GIS analysis tools there was estimated about 3286 sites for possible wetlands with the mean area of inflow basin about 4 km2 in the basins of water bodies at risk.

Rapid Assessment Of Taal Volcano Protected Landscape (TVPL) Terrestrial Biodiversity

2017 ◽  
Vol 11 (1) ◽  
Keyword(s):  
Animal Species ◽  
Rapid Assessment ◽  
Ecological Status ◽  
Taal Volcano ◽  
Ecological Barriers ◽  
Floral Diversity ◽  
Forested Areas ◽  
Baseline Information ◽  
Study Sites ◽  
Terrestrial Biodiversity

With the exponential rise of human activities in the past decades, majority of studies conducted in Taal Volcano Protected Landscape (TVPL) are geared towards the conservation and preservation of Lake Taal’s remaining biodiversity. However, the current structure and assemblage of its terrestrial biotic communities remain relatively unstudied. In this study, we conducted biodiversity censuses in the four sites in TVPL to provide baseline information regarding the community structure of the selected study sites. Comparison of the plant diversity in Taal Volcano Crater Island and Romandan Falls within the forested areas of Mataas na Kahoy, Batangas reveal that both sites support remarkably different vegetation, with the former supporting a smaller floral diversity. The fairly small number of animal samples present difficulty in providing conclusive findings to the wildlife structure of the two study sites. However, the presence of 11 animal species exhibit valuable results in determining the ecological status of TVPL. It is deduced that several ecological barriers exist between the sites, which is attributed to their unique terrestrial biota.

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