2005
DOI: 10.1007/s10661-005-3966-5
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Determining Ecoregions for Environmental and GMO Monitoring Networks

Abstract: A representative environmental monitoring network at the regional scale cannot use raster-based or random sampling designs, but requires a stratified sampling procedure integrating different information layers, and it has to occur in ecologically differing homogeneous regions (ecoregions). These we have determined using a set of spatial strata with ecological variables which we analysed with classification and regression trees (CART). We present a framework for environmental monitoring, that covers different s… Show more

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Cited by 26 publications
(20 citation statements)
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“…Para Graef et al (2004), a unidade territorial propícia para efetuar o monitoramento nestas situações é a ecorregião, em função da existência de uma certa homogeneidade florística e faunística em sua composição. Tais autores salientam as dificuldades de identificação dos riscos e benefícios potenciais da liberação ambiental de cultivares transgênicos devido à complexidade dos ecossistemas, sendo que os impactos ambientais variam espacial e temporalmente de acordo com as características agroambientais, do cultivar e da sua modificação genética, além das práticas agrícolas adotadas.…”
Section: Resultsunclassified
“…Para Graef et al (2004), a unidade territorial propícia para efetuar o monitoramento nestas situações é a ecorregião, em função da existência de uma certa homogeneidade florística e faunística em sua composição. Tais autores salientam as dificuldades de identificação dos riscos e benefícios potenciais da liberação ambiental de cultivares transgênicos devido à complexidade dos ecossistemas, sendo que os impactos ambientais variam espacial e temporalmente de acordo com as características agroambientais, do cultivar e da sua modificação genética, além das práticas agrícolas adotadas.…”
Section: Resultsunclassified
“…This can help to guide the selection of boundaries for the environmental sampling. A classification of ecoregions for environmental and GMO monitoring networks has been proposed by Graef et al (2005). These authors suggest that a variety of ecological data should be combined with socio-economic data (such as land use), to help integrate spatial and temporal complexity and heterogeneity of ecosystems being surveyed and thus provide more reliable, accurate and reproducible data.…”
Section: Discussionmentioning
confidence: 99%
“…Rather than random sampling, in such an approach, sampling is a stratified procedure integrating different layers of information. The authors also highlight that GMO monitoring networks must be integrated with agricultural data and might also require adaptation and improvement with regards to its implementation over long periods of time and large areas, such as in many agriculture-based regions or countries (Graef et al 2005). …”
Section: Discussionmentioning
confidence: 99%
“…Additionally, GMP EM should take place in areas exposed to GMP, preferably cultivated fields and their environment, but should include also regions with no or unknown GMP exposure as reference areas. On a case-by-case basis depending on the GMP characteristics, the selected indicators, checkpoints and related analytical methods should consider relevant different spatial and temporal scales (Graef et al 2005;VDI 2006). The number of monitoring sites and regions needs to be sufficient to support statistical analysis of results based on good scientific practice (Büh-ler 2006;Stein and Ettema 2003).…”
Section: Selection Of Representative Gmp Monitoring Sites By Help Of mentioning
confidence: 99%
“…For Europe and Germany, ecological land classifications were calculated by means of multivariate statistics and based on digital maps depicting the spatial patterns of ecologically relevant land characteristics. For both, Germany and some federal states, ecoregions were calculated by applying CART and using surface maps on climate, altitude, soil, and potential natural vegetation (Graef et al 2005;Schröder et al 2006aSchröder et al , 2006b). The according maps have a spatial resolution of 2 × 2 km² and 1 × 1 km², respectively.…”
Section: Selection Of Representative Gmp Monitoring Sites By Help Of mentioning
confidence: 99%