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Biological plant invasions pose a serious threat to native biodiversity and have received much attention, especially in terrestrial habitats. In freshwater ecosystems impacts of invasive plant species are less studied. We hypothesized an impact on organisms from the water column and from the sediment. We then assessed the impact of three aquatic invasive(More)
Samples issued from intensive sampling in the Netherlands (1992–2001) and from extensive sampling carried out in the context of international campaigns (1998, 2000 and 2001) were revisited. Additional samples from artificial substrates (1992–2003) and other techniques (various periods) were analysed. The combined data provide a global and dynamic view on(More)
The larvae of Issoria lathonia L. feed in natural conditions on several Viola spp., among which are the zinc-accumulating Viola calaminaria (Gingins) Lej. and the nonmetal-accumulating Viola tricolor L. To examine how I. lathonia caterpillars cope with the naturally high foliar zinc concentration of V. calaminaria, we compared the growth of caterpillars(More)
Earthworms were studied at six sites along a gradient of urbanization and their relations with several soil abiotic factors were determined. Concentrations of heavy metals, calcium and magnesium in earthworms and in soils were measured by atomic absorption spectroscopy. Strong negative correlations were detected between earthworm density and soil(More)
This article provides a meta-analysis of quantitative data available in literature regarding the relation between termite numbers and the volume of their mounds for 24 species belonging to 13 genera. The leading question behind this analysis is: “how do the respiratory gas exchanges regulate the size of termite mounds?” This question is answered through the(More)
Coelomic fluid of the Lumbricid Eisenia fetida contains a 42-kDa pattern recognition protein named coelomic cytolytic factor (CCF) that binds microbial cell wall components and triggers the activation of the prophenoloxidase cascade, an important invertebrate defense pathway. Here we report on the sequence characterization of CCF-like molecules of other(More)
The foraging activities of four genera (six species) of grassland ants (Formica rufibarbis, Tapinoma erraticum, Myrmica schenki, M. sabuleti, Tetramorium caespitum andT. impurum) were observed in June–July 1985 at Treignes (Belgium). Foraging activity was assessed by taking sequential records of foragers' fluxes during 30 seconds through the perimeter of(More)
Small lenticular soil mounds are scattered in several African savannahs. At Lamto, Côte d’Ivoire, most of these lenticular mounds house nests of Odontotermes aff. pauperans which have to date been thought to have built them. However, repeated observations made in 2000 and 2015 supply several arguments in favour of another hypothesis, namely that after a(More)
The growth and demography ofCubitermes speciosus mounds were studied in an equatorial forest ecosystem near Kisangani, Zaïre. The mounds were censused and measured on eight occasions from June 1985 to January 1993 on 25 plots of 100 m2. Mounds were found to grow in two ways: either they were enlarged sporadically, leading to a correlation between age and(More)
Le poids frais, le poids sec, la teneur en eau, l'équivalent énergétique et la teneur en cendres ont été mesurées pour la plupart des castes et stades deTrinervitermes geminatus dans la région de Lamto (Côte d'Ivoire). La production de sexués ailés a été estimée d'après les pourcentages de nymphes observés dans des sociétés naturelles, la production des(More)