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Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Effects of insecticide applications on macroinvertebrate density and biomass in rice-fields in the Rhône-delta, France (2000)
Auteurs :	Frank Suhling, Auteur ; Silke Befeld, Auteur ; Matthias Häusler, Auteur ; Katrin Katzur, Auteur ; Sigrit Lepkojus, Auteur ; François Mesléard, Auteur
Type de document :	Article
Dans :	Hydrobiologia (431(1) July, 2000)
Article en page(s) :	69-79
Langues:	Anglais
Mots-clés :	TdV ; Camargue ; rizière ; Odonata ; Insecticide
Mots-clés:	Odonata ; TdV ; alphamethine ; diazinon ; lindane ; macroinvertebrate succession ; rice-fields
Résumé :	The density of 23 macroinvertebrate species and the total macroinvertebrate biomass were compared between rice-fields treated with lindane and diazinon in June and alphamethine in August and untreated controls. The macroinvertebrates could be divided into four groups: (1) Taxa, in which the densities were lower in the insecticide treatment in July and August than in the non-insecticide treatment. (2) The Culicidae which occurred in the insecticide treatment in significantly lower density in July, but in significantly higher density in August. (3) Ischnura elegans (Vander L.) which was found in July after the lindane application in significantly higher numbers in the insecticide treatments, but in significantly lower numbers in the insecticide treatment in August after the application of the pyrethroid. In these three groups, we assumed that direct effects due to the insecticides toxicity were the reason for the differences in density. (4) The fourth group included three taxa in which the densities were significantly higher in the insecticide treatment in July and August than in the control. For this, indirect effects due to reduced biotic interactions may be responsible. The biomass was higher in the insecticide treatments in July, mainly because of a high increase in gastropod density, during the rest of the season it was similar between treatments and controls.
En ligne :	https://doi.org/10.1023/A:1004006422334

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