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Auteur Jeremy Biggs
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The freshwater biota of British agricultural landscapes and their sensitivity to pesticides / Jeremy Biggs (2007)
Titre : The freshwater biota of British agricultural landscapes and their sensitivity to pesticides Type de document : texte imprimé Auteurs : Jeremy Biggs ; Penny Williams ; Mericia Whitfield ; Pascale Nicolet ; Colin Brown ; John Hollis ; Dave Arnold ; Tim Pepper Année de publication : 2007 Article en page(s) : pp 137-148 Catégories : Ecoplanète
évaluation des risques ; INVERTEBRE ; MACROPHYTE ; PESTICIDE
Résumé : This study analysed information from national and regional datasets gathered in Great Britain describing the occurrence of aquatic macroinvertebrates and macrophytes in ponds, ditches, streams, rivers and lakes, across 12 agricultural landscape classes and a 13th class comprising non-agricultural land. The study found major differences in the composition of the invertebrate faunas of running and still water. River and stream assemblages had a relatively high proportion of species (20-40%) in groups believed to be sensitive to pesticides (mayflies, stoneflies, amphipod crustaceans). The proportion of these taxa also varied across the landscape with greater numbers of pesticide-sensitive species present in streams in more acid landscape classes. Ponds, in contrast, were dominated by water beetles and water bugs and supported fewer sensitive taxa (ca. 5% of the species present). The proportion of the fauna made up by these two taxonomic groups in ponds varied little between landscape classes. Ditches were intermediate between ponds and streams in both taxonomic composition and their variability across landscape class. Invertebrate species richness and rarity values were highest in rivers and ponds with fewer species in streams and ditches. Ponds typically supported more uncommon invertebrate species than other waterbody types. Plant assemblage data showed that, except for lakes, wetland landscape types (fenlands and valleys) were generally richer in species, with more uncommon taxa, than other landscapes. Ditch floras were often outstanding in these areas. The study findings have applications and implications in areas such as the development of environmentally valid mesocosm studies and for the creation of realistic scenarios in probabilistic risk assessment.
in Agriculture, Ecosystems and Environment > n°122 (2007) . - pp 137-148[article]Morphological and physico-chemical properties of British aquatic habitats potentially exposed to pesticides / Colin David Brown (2006)
Titre : Morphological and physico-chemical properties of British aquatic habitats potentially exposed to pesticides Type de document : texte imprimé Auteurs : Colin David Brown ; Nigel Turner ; John Hollis ; Pat Bellamy ; Jeremy Biggs ; Penny Williams ; Dave Arnold ; Tim Pepper ; Steve Maund Année de publication : 2006 Article en page(s) : pp 307-319 Catégories : Ecoplanète
BASE DE DONNEES ; évaluation de risque ; PAYSAGE ; ZONE HUMIDE
Résumé : Approaches to describe the exposure of non-target aquatic organisms to agricultural pesticides can be limited by insufficient knowledge of the environmental conditions where the compounds are used. This study analysed information from national and regional datasets gathered in the UK describing the morphological and physico-chemical properties of rivers, streams, ponds and ditches. An aggregation approach was adopted, whereby the landscape was divided into 12 hydrogeological classes for agricultural areas and a 13th class that comprised nonagricultural land. The data describe major differences in the abundance, dimensions and chemistry of waterbodies in the different landscapes. There is almost an order of magnitude difference in the total input of pesticide per unit area between the different landscapes. Ditches are shown to be most proximate to arable land, streams and rivers intermediate and ponds the least proximate. Results of the study have implications for the development of standard scenarios for use in protective screening steps within the risk assessment. Data can be used to produce more realistic estimates of the exposure of aquatic systems to pesticides and to examine how that exposure varies across the landscape.
in Agriculture, Ecosystems and Environment > n°113 (2006) . - pp 307-319[article]The National Pond Monitoring Network Proposal for Phase 2 : 2005 to 2007 / WEATHERBY, A. (Janvier 2005)
Titre : The National Pond Monitoring Network Proposal for Phase 2 : 2005 to 2007 Type de document : texte imprimé Auteurs : A. WEATHERBY ; Jeremy Biggs ; S. HOWARDS Année de publication : Janvier 2005 Importance : 12 p. Langues : Français (fre) Catégories : Ecoplanète
Genre de document : Document d'information Descripteur géographique : ROYAUME-UNI