Relationships between flow variability and macroinvertebrate assemblage composition: data from four Australian dryland rivers

2006 ◽  
Vol 22 (2) ◽  
pp. 219-238 ◽  
Author(s):  
Fran Sheldon ◽  
Martin C. Thoms
Keyword(s):  
Assemblage Composition ◽  
Flow Variability ◽  
Composition Data ◽  
Macroinvertebrate Assemblage ◽  
Dryland Rivers

Multinomial regression for analyzing macroinvertebrate assemblage composition data

2012 ◽  
Vol 31 (3) ◽  
pp. 681-694 ◽  
Author(s):  
Song S Qian ◽  
Thomas F Cuffney ◽  
Gerald McMahon
Keyword(s):  
Multinomial Regression ◽  
Assemblage Composition ◽  
Composition Data ◽  
Macroinvertebrate Assemblage

Flow variability in dryland rivers: boom, bust and the bits in between

2006 ◽  
Vol 22 (2) ◽  
pp. 179-186 ◽  
Author(s):  
Stuart E. Bunn ◽  
Martin C. Thoms ◽  
Stephen K. Hamilton ◽  
Samantha J. Capon
Keyword(s):  
Flow Variability ◽  
Dryland Rivers

Biological indicators of stream health using macroinvertebrate assemblage composition: a comparison of sensitivity to an urban gradient

2006 ◽  
Vol 57 (1) ◽  
pp. 37 ◽  
Author(s):  
Christopher J. Walsh
Keyword(s):  
Small Area ◽  
Ecosystem Health ◽  
Human Impacts ◽  
Biological Indicators ◽  
Assessment System ◽  
Biotic Index ◽  
Urban Gradient ◽  
Assemblage Composition ◽  
Management Objectives ◽  
Macroinvertebrate Assemblage

Biological indicators are increasingly being used as integrative measures of ecosystem health in streams, particularly indicators using macroinvertebrate assemblage composition. Several indicators of this type have been advocated, including biotic indices based on taxa sensitivities, richness indices and ratios of observed to expected taxa from models predicting assemblage composition in streams with little human impact (O/E scores). The present study aimed to compare the sensitivity of indicators of each of these types (all used for legislated objectives for stream protection in Victoria, Australia) to a gradient of urban disturbance in 16 streams in a small area in eastern Melbourne. The biotic index SIGNAL and number of Ephemeroptera, Plecoptera or Trichoptera families were the most sensitive indicators, whereas total number of families and O/E scores from Australian river assessment system (AUSRIVAS) models were least sensitive. Differences in sensitivity were not the result of sampling or taxonomic inadequacies. AUSRIVAS and similar models might be improved by using only predictor variables that are not affected by human impacts and by sounder approaches to model selection. Insensitivities of indicators and misclassification of sites by the Victorian objectives show that assessment of indicators against disturbance gradients is critical for setting management objectives based on biological indicators.

Protection of in-stream biota from urban impacts: minimise catchment imperviousness or improve drainage design?

2004 ◽  
Vol 55 (3) ◽  
pp. 317 ◽  
Author(s):  
Christopher J. Walsh
Keyword(s):  
Urban Gradient ◽  
Assemblage Composition ◽  
Explanatory Variables ◽  
Urban Impacts ◽  
Macroinvertebrate Assemblage ◽  
Impervious Area ◽  
Drainage Connection ◽  
Drainage Design ◽  
Urban Catchments ◽  
Stream Biota

Urbanisation is a looming global threat to in-stream biodiversity, but the best approaches to mitigation are unclear. This paper asks if the protection of in-stream biota, in particular macroinvertebrate assemblages, is dependent on the sequestration of catchments from urbanisation, or if protection in urbanised catchments can be achieved through better drainage design. In-stream macroinvertebrate assemblage composition was assessed for 16 catchments spanning a rural–urban gradient. Catchment imperviousness and drainage connection (the proportion of impervious area directly connected to streams by stormwater pipes), together with other possible driving factors, were assessed as explanatory variables of macroinvertebrate assemblage composition. The proportion of variance explained independently and jointly by each variable was assessed by hierarchical partitioning. Assemblage composition was strongly explained by the gradient of urban density (i.e. a large proportion of variance was jointly explained by variables correlated with the urban gradient; imperviousness, connection, longitude and elevation). However, drainage connection was the strongest independent correlate. Most sensitive taxa were absent from sites with >20% connection. Thus the connection of impervious surfaces to streams by pipes is a more likely determinant of taxa loss than the impervious areas themselves. Low-impact urban design approaches that reduce drainage connection are postulated as the most effective management solution to the protection of stream biota in urban catchments.

Towards a European Food Composition Data Interchange Platform

2012 ◽  
Vol 82 (3) ◽  
pp. 209-215 ◽  
Author(s):  
Simone Bell ◽  
Heikki Pakkala ◽  
Michael P. Finglas
Keyword(s):  
Nutrient Content ◽  
Food Composition ◽  
Consumer Information ◽  
Health Claims ◽  
Composition Data ◽  
European Committee ◽  
Food Properties ◽  
Data Interchange ◽  
Food Composition Data ◽  
Definition Of

Food composition data (FCD) comprises the description and identification of foods, as well as their nutrient content, other constituents, and food properties. FCD are required for a range of purposes including food labeling, supporting health claims, nutritional and clinical management, consumer information, and research. There have been differences within and beyond Europe in the way FCD are expressed with respect to food description, definition of nutrients and other food properties, and the methods used to generate data. One of the major goals of the EuroFIR NoE project (2005 - 10) was to provide tools to overcome existing differences among member states and parties with respect to documentation and interchange of FCD. The establishment of the CEN’s (European Committee for Standardisation) TC 387 project committee on Food Composition Data, led by the Swedish Standards Institute, and the preparation of the draft Food Data Standard, has addressed these deficiencies by enabling unambiguous identification and description of FCD and their quality, for dissemination and data interchange. Another major achievement of the EuroFIR NoE project was the development and dissemination of a single, authoritative source of FCD in Europe enabling the interchange and update of data between countries, and also giving access to users of FCD.

Magnetic Field Binning and Display of Ion Composition Data.

1995 ◽  
Author(s):  
Dennis E. Delorey ◽  
Paul N. Pruneau ◽  
John R. Palys
Keyword(s):  
Magnetic Field ◽  
Ion Composition ◽  
Composition Data
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