161 research outputs found
Chironomid mouthpart deformities as indicator of environmental quality: a case study in Lake Trasimeno (Italy)
No full textThe aim of the present study was to monitor mouthpart deformities of Chironomus plumosus (Insecta-
Diptera) in Lake Trasimeno (2000–2010) in relation with sediment contamination by heavy metals,
which is one of the main causes of deformity induction. In Lake Trasimeno, concentrations of heavy
metals in the investigated littoral zone were low, in comparison with those of the central area. By
contrast, the incidence of deformities was much higher in the littoral station (2006–2009) than in the
central area. In the littoral zone, the deformities progressively decreased and by 2010 reached values
similar to those observed in the central area (2000–2002, 2010). This decrease was mainly due to the
reduction of severe deformities, thus indicating an environmental quality recovery of this littoral sector.
Chemical analysis revealed that the higher incidence of deformities in the littoral zone was not caused
by heavy metal contamination, unless they may have contributed to a joint action with other toxicants.
The present study on Lake Trasimeno provided additional evidence that chironomid mouthpart
deformities can be used in biomonitoring programs to evaluate sediment contamination by toxicants.
Since mouthpart deformities may also be induced by compounds not included in routine chemical
analyses, they may better reflect sediment quality than chemical analysis alone
Metodologie di analisi della componente bentonica di un corso d'acqua dell'italia centrale (T. Fersinone)
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CHECKLIST E DISTRIBUZIONE DEI LEPIDOTTERI PAPILIONOIDEI IN UMBRIA (ITALIA) (Lepidoptera, Papilionoidea)
No full textChecklist and distribution of Lepidoptera Papilionoidea in Umbria Region (Italy). There is extensive knowledge of the geographical distribution of Italian Papilionoidea Lepidoptera although in Umbria there are still locations to be investigated. The aim of this study is to update the checklist of Papilionidea Lepidoptera in Umbria, giving special attention to Natura
2000 Sites, and to ascertain the distribution of their populations. During this research, carried out over five years (2006-2010), about 2,500 specimens belonging to 121 species and comprising 5
families were collected. In addition, the checklist was supplemented by unpublished data from private collections which brings the number of species to 126. Two species are reported for the first time. Three species, previously reported in Umbria were not found in this survey. Their inclusion
in the checklist of Papilionoidea in Umbria brings the total number of species to 128
la diga sul Fiume Chiascio (Umbria): conseguenze sulla dinamica trofica della comunità macrobentonica
No full textInfluence of fish farming on the spatial patterns and biological traits of river invertebrates in an Appenine stream system (Italy)
No full textIn applied river ecology it is implicitly assumed that community structure is a surrogate for functional properties. To test this hypothesis, 26 sites were sampled for macroinvertebrates in a Central Italian stream system impacted by 13 trout farms (1 upstream and 1 downstream site per facility). We used a fuzzy-coding approach of biological traits combined with species distribution analysis. Trout farm locally impacted the structure of macroinvertebrate communities, but serial disturbances at the stream system scale did not affect the overall regional diversity pattern. Impacted sites had species with large body size, which fed upon microorganisms and fine detritus, and which showed asexual reproduction. Least impact sites hosted small-sized invertebrates showing sexual reproduction, and feeding upon plant material and/or algae
Trichoptera populations in the water system of the Tiber river in Tuscany and Emilia Romagna (Italy).
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