A biométrie study was carried out on the winged Trichoptera fauna of the entire Italian peninsula... more A biométrie study was carried out on the winged Trichoptera fauna of the entire Italian peninsula. It covered 191 taxa from five families: Rhyacophilidae (33 taxa), Glossosomatidae (11), Hydrophilidae (36), Hydropsychidae (19) and Limnephilidae (92). The specimens examined are in the "GP Moretti Collection", which, at present, represents 90% of the Italian taxa.
The Chiascio River (central Italy) macrobenthic invertebrate community is analysed in relation to... more The Chiascio River (central Italy) macrobenthic invertebrate community is analysed in relation to the management of a recently constructed reservoir located about halfway along the watercourse. The dam was originally planned for irrigation purposes, but since 2005 has only been used to regulate the minimum flow of the river, with partial filling in spring and total discharge in autumn. Seasonal sampling surveys, conducted from 1996 to 1999 at 13 stations along the river, yielded 45,744 specimens of benthic macroinvertebrates belonging to 109 taxa. The functional feeding analysis revealed a zone of discontinuity downstream of the dam, with high values of shredders and low values of collectors. The discontinuity is probably due to the reintroduction, in autumn, of the stored particulate organic matter. This altered the trophic structure of the benthic community just downstream of the dam, moving it towards a facies of lower stream order.
Morphometric characters of 961 adult caddisflies, belonging to 327 taxa of the Italian Trichopter... more Morphometric characters of 961 adult caddisflies, belonging to 327 taxa of the Italian Trichopteran fauna were observed and measured. Sexual dimorphism is reflected in the smaller mean size of males, with mean differences in body length of 12.57%. For the order Trichoptera, regressions of the relationships among body dimensions have been used to estimate the value of exponent b and coefficient a of the allometric function y = a * x b , a power function that describes these relationships very well. The lengths (forewing, head-wing, metafemur, and head) versus body length relationships displayed a high degree of isometry among species, with head-wing and forewing having the highest correlation values (especially in males). The results show that most of the variance depends on isometric size variation and not on allometric shape variation among the different species. For adult caddisflies, this demonstrates constancy of the morphological model in the Italian Trichoptera.
The developmental stages of the larvae of Libellula depressa were investigated for three years in... more The developmental stages of the larvae of Libellula depressa were investigated for three years in permanent freshwater pools in central Italy. Eleven instars (F-0 -F-10) of L. depressa were discriminated by size and scatter plot. Scatter plots were constructed using the following measurements: labium length, head width, metafemur length, forewing-pad length, and total larval body length. Prolarvae instar was derived by Dyar's law. The mean growth rate coefficient values were about 0.77 for isometric parameters and 0.51 for the forewing-pad allometric parameter. L. depressa appeared to be a 'spring species', as defined by Corbet, and the population we studied had a mainly semivoltine life history and, probably, a small proportion of the larvae a univoltine cycle. Eggs showed direct development.
A study was undertaken to define the benthic populations, the environmental-ecological variabilit... more A study was undertaken to define the benthic populations, the environmental-ecological variability and trophic aspects according to the functional feeding groups in the upper reaches of the Nera River, a tributary of the Tiber, in central Italy. A total of 12 681 individuals was collected and 83 taxa were identified; 11 proved to be endemic for Italy, 7 of them typical of the central Apennines. The greatest number of taxa (58), and the highest values of diversity were recorded at the lowest sampling station, 37 km from the source. A dendrogram constructed by the UPGMA method based on values of similarity revealed two main clusters, one identified with crenon (at the source) and the other with rhithron (the downstream stations) fluvial typology. Correspondence analysis on the environmental matrix parameters confirmed this finding. Taxa abundance was evaluated by grouping the individuals collected into classes using semi-quantitative sampling. The results of trophic-functional analysis, calculated on the basis of the estimated abundance and tested with statistical methods, agreed with fauna composition analysis clusters for the filtering collector and shredder categories. The zonal and clinal patterns reveal that there may be a weak upstream to downstream gradient within a single fluvial zone and almost discontinuity in contiguous tracts when the abiotic gradient changes suddenly.
The aim of this study is the characterization of the distribution of Ephemeroptera and Plecoptera... more The aim of this study is the characterization of the distribution of Ephemeroptera and Plecoptera along the Chiascio River (tributary of the Tiber River, Central Italy) in response of the dam's building. Thirteen taxa of Ephemeroptera and seven taxa of Plecoptera were identified. ...
ShyacopMla sp. (gr. meyeri Me Lachlan) 10364 A Piemonte, sorgente i s.l.m.1180-04/08/64 Val Viu'-... more ShyacopMla sp. (gr. meyeri Me Lachlan) 10364 A Piemonte, sorgente i s.l.m.1180-04/08/64 Val Viu'-a destra Rio Civrarì 2 , Vigano' Moretti ShyacopMla sp. (gr. occidentals Me Lachlan) 5979 A Liguria, ruscello-16/10/82 M. S. Giorgio 1 Ravizza Moretti ShyacopMla sp. (gr, pallida Mosely) 6048 A Sardegna, ruscello Poggiolu-20/05/80 M. Limbara 1. Azara Moretti ShyacopMla pallida ? Mosely 448 A Sardegna, ruscello Ballili m s.1.1.400-02/05/86 M. Sarrabus 1. Gerecke Moretti ShyacopMla praemorsa (var, ?) Me Lachlan 10299 A Liguria, torrente i s,1.1.1360-17/08/64 Triora-Monesi 1 Moretti Vigano' Moretti ShyacopMla sp. (simuiatrix Me Lachlan ?
A biométrie study was carried out on the winged Trichoptera fauna of the entire Italian peninsula... more A biométrie study was carried out on the winged Trichoptera fauna of the entire Italian peninsula. It covered 191 taxa from five families: Rhyacophilidae (33 taxa), Glossosomatidae (11), Hydrophilidae (36), Hydropsychidae (19) and Limnephilidae (92). The specimens examined are in the "GP Moretti Collection", which, at present, represents 90% of the Italian taxa.
The Chiascio River (central Italy) macrobenthic invertebrate community is analysed in relation to... more The Chiascio River (central Italy) macrobenthic invertebrate community is analysed in relation to the management of a recently constructed reservoir located about halfway along the watercourse. The dam was originally planned for irrigation purposes, but since 2005 has only been used to regulate the minimum flow of the river, with partial filling in spring and total discharge in autumn. Seasonal sampling surveys, conducted from 1996 to 1999 at 13 stations along the river, yielded 45,744 specimens of benthic macroinvertebrates belonging to 109 taxa. The functional feeding analysis revealed a zone of discontinuity downstream of the dam, with high values of shredders and low values of collectors. The discontinuity is probably due to the reintroduction, in autumn, of the stored particulate organic matter. This altered the trophic structure of the benthic community just downstream of the dam, moving it towards a facies of lower stream order.
Morphometric characters of 961 adult caddisflies, belonging to 327 taxa of the Italian Trichopter... more Morphometric characters of 961 adult caddisflies, belonging to 327 taxa of the Italian Trichopteran fauna were observed and measured. Sexual dimorphism is reflected in the smaller mean size of males, with mean differences in body length of 12.57%. For the order Trichoptera, regressions of the relationships among body dimensions have been used to estimate the value of exponent b and coefficient a of the allometric function y = a * x b , a power function that describes these relationships very well. The lengths (forewing, head-wing, metafemur, and head) versus body length relationships displayed a high degree of isometry among species, with head-wing and forewing having the highest correlation values (especially in males). The results show that most of the variance depends on isometric size variation and not on allometric shape variation among the different species. For adult caddisflies, this demonstrates constancy of the morphological model in the Italian Trichoptera.
The developmental stages of the larvae of Libellula depressa were investigated for three years in... more The developmental stages of the larvae of Libellula depressa were investigated for three years in permanent freshwater pools in central Italy. Eleven instars (F-0 -F-10) of L. depressa were discriminated by size and scatter plot. Scatter plots were constructed using the following measurements: labium length, head width, metafemur length, forewing-pad length, and total larval body length. Prolarvae instar was derived by Dyar's law. The mean growth rate coefficient values were about 0.77 for isometric parameters and 0.51 for the forewing-pad allometric parameter. L. depressa appeared to be a 'spring species', as defined by Corbet, and the population we studied had a mainly semivoltine life history and, probably, a small proportion of the larvae a univoltine cycle. Eggs showed direct development.
A study was undertaken to define the benthic populations, the environmental-ecological variabilit... more A study was undertaken to define the benthic populations, the environmental-ecological variability and trophic aspects according to the functional feeding groups in the upper reaches of the Nera River, a tributary of the Tiber, in central Italy. A total of 12 681 individuals was collected and 83 taxa were identified; 11 proved to be endemic for Italy, 7 of them typical of the central Apennines. The greatest number of taxa (58), and the highest values of diversity were recorded at the lowest sampling station, 37 km from the source. A dendrogram constructed by the UPGMA method based on values of similarity revealed two main clusters, one identified with crenon (at the source) and the other with rhithron (the downstream stations) fluvial typology. Correspondence analysis on the environmental matrix parameters confirmed this finding. Taxa abundance was evaluated by grouping the individuals collected into classes using semi-quantitative sampling. The results of trophic-functional analysis, calculated on the basis of the estimated abundance and tested with statistical methods, agreed with fauna composition analysis clusters for the filtering collector and shredder categories. The zonal and clinal patterns reveal that there may be a weak upstream to downstream gradient within a single fluvial zone and almost discontinuity in contiguous tracts when the abiotic gradient changes suddenly.
The aim of this study is the characterization of the distribution of Ephemeroptera and Plecoptera... more The aim of this study is the characterization of the distribution of Ephemeroptera and Plecoptera along the Chiascio River (tributary of the Tiber River, Central Italy) in response of the dam's building. Thirteen taxa of Ephemeroptera and seven taxa of Plecoptera were identified. ...
ShyacopMla sp. (gr. meyeri Me Lachlan) 10364 A Piemonte, sorgente i s.l.m.1180-04/08/64 Val Viu'-... more ShyacopMla sp. (gr. meyeri Me Lachlan) 10364 A Piemonte, sorgente i s.l.m.1180-04/08/64 Val Viu'-a destra Rio Civrarì 2 , Vigano' Moretti ShyacopMla sp. (gr. occidentals Me Lachlan) 5979 A Liguria, ruscello-16/10/82 M. S. Giorgio 1 Ravizza Moretti ShyacopMla sp. (gr, pallida Mosely) 6048 A Sardegna, ruscello Poggiolu-20/05/80 M. Limbara 1. Azara Moretti ShyacopMla pallida ? Mosely 448 A Sardegna, ruscello Ballili m s.1.1.400-02/05/86 M. Sarrabus 1. Gerecke Moretti ShyacopMla praemorsa (var, ?) Me Lachlan 10299 A Liguria, torrente i s,1.1.1360-17/08/64 Triora-Monesi 1 Moretti Vigano' Moretti ShyacopMla sp. (simuiatrix Me Lachlan ?
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