Effet des bordures de champs sur les populations de Chrysopes en cultures maraîchères

in Phytoprotection (2003), 84(2), 121-128

Both diversity and density of lacewings depend on prey availability but also on plant composition near crops. The impact of field borders vegetation on abundance and diversity of Syrphidae and ... [more ▼]

Both diversity and density of lacewings depend on prey availability but also on plant composition near crops. The impact of field borders vegetation on abundance and diversity of Syrphidae and Coccinellidae is well known but very few studies have been realised to assess its effect on the abundance and diversity of Chrysopidae. In 2000 and 2001, the impact of adjacent habitats on lacewing populations was investigated in both carrot and broad bean open fields. Three types of field borders were selected: (1) set-asides mainly composed by Lolium perenne and Trifolium spp., (2) crops (wheat, beet or other vegetables) and (3) woody areas (mixture of Acer sp., Populus sp. and Salix sp.). Insects were caught using yellow pan traps. Chrysopidae populations were shown to be significantly lower in carrot and broad bean fields bordered with woodland. Lacewing and other Neuroptera species richness were always low and were discussed in relation with their role of pest predators associated with other aphidophagous insects. [less ▲]

L'effet des décisions judiciaires à l'égard des tiers

in Le contentieux interdisciplinaire (1996)

Effet des doses de la fumure azotée sur l'accumulation de l'azote dans le grain du froment d'hiver (Triticum aestivum L.)

Scientific conference (2005)

Effet des inclusions et des carbures dans des aciers et fontes fortement alliés, soumis à des sollicitations mécaniques sévères

Report (2004)

Effet des mesures de gestion sur la stabilité de l'écosystème forestier: mise à blanc et reboisement du bassin versant de la Robinette. Rapport final, mars 2003.

Report (2003)

Effet des mesures de gestion sur la stabilité de l'écosystème forestier: mise à blanc et reboisement extensif. Rapport intermédiaire, novembre 2003.

Report (2003)

Effet des protéines et des fibres alimentaires sur les pertes iléales d'acides aminés endogènes chez le porc.

in Journées de la Recherche Porcine en France (1997), 29

An N-free diet was supplemented with limited but increasing amounts of proteins (30, 60, 90 g/kg diet from a mixture of casein and egg yolk), in order to measure their effect on the ileal endogenous amino ... [more ▼]

An N-free diet was supplemented with limited but increasing amounts of proteins (30, 60, 90 g/kg diet from a mixture of casein and egg yolk), in order to measure their effect on the ileal endogenous amino acid (AA) losses in pigs. The study was conducted at 2 dietary fibre levels: 20 and 80 g/kg, isolated from pea seeds. Compared to the N-free diet, a supply of 30 g proteins was sufficient to obtain a positive N retention and the following supplies allowed a constant and linear increase (0.88 g N retained/g N intake). The same supply induced an increase in ileal endogenous losses, compared to the control (10.7 vs 7.2 g AA/kg DMi for the low fibre diet) but the difference was not significant because of a high variability between the pigs. The supplies of 60 and 90 g proteins did not modify the level of the losses either: 10.2 and 10.6 g AA/kg DMi, respectively. The same trends were observed for the diets with a high fibre level but, in this case, the losses were significantly higher: respectively 14.9, 16.7, 15.7 and 17 g AA/kg DMi. On the other hand, the fraction of the digesta containing the free AA and the small peptides (< 3 kDa), supposed to be mainly of dietary origin, remained independent of the protein level. This suggests a virtually complete digestibility of the dietary proteins. Thus, pea fibres induce a significant increase of the ileal endogenous losses but without disturbing the protein digestion process, as suggested by the N retention. The protein supply probably increased the digestive secretions but the latter could have been highly reabsorbed, due to a lack in dietary factors susceptible to increase the reabsorption. [less ▲]

L'effet dévolutif de l'appel et le sort en degré d’appel des déclinatoires de la compétence du juge siégeant en référé et comme en référé en matière commerciale

in Revue de Droit Commercial Belge [= RDC] = Tijdschrift voor Belgisch Handelsrecht [=TBH] (1999)

L’effet direct horizontal des libertés communautaires et la liberté syndicale

in Revue de la Faculté de Droit de l'Université de Liège (2009), 4

Effet du chargement et de la période de complémentation au pâturage sur les performances de taurillons finis en stabulation

in Annales de Médecine Vétérinaire (1994), 138