Recherches écologiques sur les Chironomides (Diptera) de Camargue. I. Etude faunistique et biogéographique

Abstract

J.-N. TOURENQ (2)-biological observations and ecological notes : adaptations to variations in salinity, to variations in the level of dissolved oxygen, and resistance to drying. Three species have a circum-mediterranean distribution and three species have also been recorded in the Ethiopian region. * La quantité de Cl peut être expimée en gr/1 (Chlorosité) en gr/Kg (Chlorinité). Le terme salinité ne s'emploie que pour désigner la teneur totale en sels et ne s'exprime en aucun cas en NaCl. Dans cette étude a été adoptée la Classification du Symposium de Venise (1958) et les subdivisions plus récemment proposées par les auteurs Scandinaves (

Chironomids (Diptera) of Temporary and Permanent Ponds in Central Italy: a Neglected Invertebrate Group in Pond Ecology and Conservation

“…This resulted in a partial overlap of sites in the N-MDS plot, which has been reported in other ponds (Collinson et al 1995, Downie et al 1998, Bazzanti et al 2003. Typical species of our temporary ponds seem to be Psectrotanypus varius, the larvae of which are widely known to be mobile predators in small, eutrophic, anoxic ponds (Tourenq 1976 (Ducrotoy 1980) where they avoid dessication by synchronizing the larval cycle with wet phase duration (Wiggins et al 1980). The other taxa recorded in our temporary ponds, especially in those with a short wet phase (less than three months), were Procladius spp., Isocladius sylvestris, the Chironomus plumosus group, and the Chironomus thummi group, which were also abundant in permanent ponds.…”

“…These data suggest that the extreme features of temporary ponds tend to favor generalist taxa adapted to very different environmental conditions (in this case, from unstable to stable habitats), where they seem to have a competitive advantage (Wotton and Armitage 1995). In contrast, the most common andlor abundant taxa in our perennial ponds, such as the Orthocladiinae I. sylvestris and Psectrocladius sordidellus, the Tanytarsini Paratanytarsus spp., Tanytarsus spp., and the Cladotanytarsus mancus group, and Pcntaneurini, were usually associated with well oxygenated, more stable mesotrophic waters rich in macrophytes (Tourenq 1976, Ferrarese 1983, Cranston et al 1983, Nocentini 1985, Schleuter 1986, Delettre 1989.…”

Quironómidos de Catalunya (2ª nota)

“…Distribución y ecología. Europa (TOURENQ, 1975). Citada de las marismas del Guadalquivir (LAVILLE & TOURENQ, 1968).…”

“…Especie propia de ríos y del litoral de los lagos y embalses así como en las charcas de la Camarga francesa, donde realiza galerías dentro de los tallos de Potamogetón (LEHMANN, 1970;SHILOVA, 1976;TOURENQ, 1975).…”

“…Especie propia de lagos y embalses e incluso aguas salobres (PALMEN, 1960;LEHMANN, 1971;TOURENQ, 1975;LAVILLE, 1979). Goetghebuer, 1931 Este ejemplar presenta como característica el tener sobre los tubérculos del terguio anal solo 1 seda en cada uno (en los embalses poseían dos y hay señalados casos con más sedas).…”