Consulta: subjectFacets:"Anthropogenic pressure"
Registros recuperados: 5
Data/hora: 10/06/2024 14:20:27

A Bayesian framework to objectively combine metrics when developing stressor specific multimetric indicator
Provedor de dados: 5
Autores: Drouineau, Hilaire; Lobry, Jeremy; Delpech, C.; Bouchoucha, Marc; Mahevas, Stephanie; Courrat, A.; Pasquaud, S.; Lepage, M.
In the context of the European Water Framework Directive (WFD), monitoring programs and related indicators have been developed to assess anthropogenic impacts on various components of aquatic ecosystems. While great precautions are usually taken when selecting and calculating relevant core metrics, little attention is generally paid to the generation of the multimetric indicator, i.e. the combination of the different core metrics. Indeed, most multimetric indicators are generated by simply averaging or summing metrics, without taking into account their sensitivity and their variability. Moreover, few indicators provide a rigorous estimate of the uncertainty of the assessments, while this estimation is essential for managers. In this context, we developed a...
Tipo: Text
Palavras-chave: Multimetric fish-based indicator; Bayesian method; Pressure-impact models; Water Framework Directive; Anthropogenic pressure; Monitoring program; Transitional waters.
Ano: 2012
URL: http://archimer.ifremer.fr/doc/00049/16037/13572.pdf

The planktonic food web of the Bizerte lagoon (south-western Mediterranean) during summer: I. Spatial distribution under different anthropogenic pressures
Provedor de dados: 5
Autores: Hlaili, A; Grami, B; Niquil, N; Gosselin, M; Hamel, D; Troussellier, Marc; Mabrouk, H.
The structure and the trophic interactions of the planktonic food web were investigated during summer 2004 in a coastal lagoon of southwestern Mediterranean Sea. Biomasses of planktonic components as well as bacterial and phytoplankton production and grazing by microzooplankton were quantified at four stations (MA, MB, MJ and R) inside the lagoon. Station MA was impacted by urban discharge, station MB was influenced by industrial activity, station MJ was located in a shellfish farming sector, while station R represented the lagoon central area. Biomasses and production rates of bacteria (7-33 mg C m(-3); 17.5-35 mg C m(-3) d(-1)) and phytoplankton (80-299 mg C m(-3); 34-210 mg C m(-3) d(-1)) showed high values at station MJ, where substantial...
Tipo: Text
Palavras-chave: Anthropogenic pressure; Spatial distribution; Planktonic food web; Mediterranean lagoon.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/2008/publication-4116.pdf

Anthropogenic pressure on the open ocean: The growth of ship traffic revealed by altimeter data analysis
Provedor de dados: 5
Autores: Tournadre, Jean.
Marine ecosystems are under increasing anthropogenic pressures from marine and terrestrial activities. Ship traffic, the major cause of change in the open ocean, and its temporal evolution are still largely unknown because of lack of data. Altimeter data provide a new powerful tool to detect and monitor the ship traffic through a method of analysis of echo waveform. The archive of seven altimeter missions has been processed to create a two decade database of ship locations. The estimated annual density maps compare well with the ones obtained from Automatic Identification System. The ship traffic analysis shows a global fourfold growth between 1992 and 2012, the largest increase being observed in the Indian Ocean and the Chinese seas reflecting the world...
Tipo: Text
Palavras-chave: Altimetry; Ship traffic; Pollution; Anthropogenic pressure.
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00229/34039/32432.pdf

A fish-based index of estuarine ecological quality incorporating information from both scientific fish survey and experts knowledge
Provedor de dados: 5
Autores: Tableau, Adrien; Drouineau, Hilaire; Delpech, C.; Pierre, M.; Lobry, J.; Le Pape, O.; Breine, J.; Lepage, Mario.
In the Water Framework Directive (European Union) context, a multimetric fish based index is required to assess the ecological status of French estuarine water bodies. A first indicator called ELFI was developed, however similarly to most indicators, the method to combine the core metrics was rather subjective and this indicator does not provide uncertainty assessment. Recently, a Bayesian method to build indicators was developed and appeared relevant to select metrics sensitive to global anthropogenic pressure, to combine them objectively in an index and to provide a measure of uncertainty around the diagnostic. Moreover, the Bayesian framework is especially well adapted to integrate knowledge and information not included in surveys data. In this context,...
Tipo: Text
Palavras-chave: Anthropogenic pressure; Bayesian method; Expert judgement; Multimetric fish-based indicator; Prior information; Water Framework Directive.
Ano: 2013
URL: http://archimer.ifremer.fr/doc/00146/25700/24029.pdf

Editorial: Biogeochemistry and Genomics of Silicification and Silicifiers
Provedor de dados: 5
Autores: Moriceau, Brivaela; Gehlen, Marion; Treguer, Paul; Baines, Stephen; Livage, Jacques; Andre, Luc.
Tipo: Text
Palavras-chave: Silicon cycle; Biogenic silica; Diatom; Isotope; Bolidophycae; Sponge (Porifera); Nanostructured silica; Anthropogenic pressure.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00488/59978/63223.pdf