Ceratopogonid midges, referred to Forcipomyia paludis, were recorded from five dragonfly species ... more Ceratopogonid midges, referred to Forcipomyia paludis, were recorded from five dragonfly species in Sardinia, Italy. All ceratopogonids were females and almost all were in the last phase of the gonotrophic cycle (gravid females). Although a parasitic association cannot be excluded, no evidence was obtained of the midge biting activity, neither by direct observation nor indirectly, by detecting the expected lesions on the host cuticle. The attachment to dragonflies of F. paludis (perhaps an autogenous species) might fit well with the hypothesis of a phoretic association which would favour the long range dispersal of the gravid females.
This PDF includes better resolution graphs than the original printed paper, and colour pictures i... more This PDF includes better resolution graphs than the original printed paper, and colour pictures instead of black and white
Literature and personal information on the distribution of I. hastata and other odon. spp. in the... more Literature and personal information on the distribution of I. hastata and other odon. spp. in the Azores is reported. I. hastata and I. pumilio are recorded for the first time from the islands of Corvo and Sao Jorge, respectively. I. hastata appears the most common and abundant sp. and its population is formed by only ♀ ♀ (no ♂ ♂ were ever recorded). The asexual reproduction of these populations was demonstrated by means of laboratory rearing during several generations. The dispersal ability of this sp. and the possible origin of parthenogenesis after its colonisation of the Azores are briefly discussed. The possible causes of threat are identified and the need for conservation measures is outlined.
A new site for L. tetraphylla from Sardinia and 4 from Tuscany are put on record. Some of these a... more A new site for L. tetraphylla from Sardinia and 4 from Tuscany are put on record. Some of these apparently harbour reproductive populations. Selysiothemis nigra is for the first time recorded from Tuscany. Introduction The sites and material examined
Populations of Ischnura hastata found in the Azores archipelago represent the only known example ... more Populations of Ischnura hastata found in the Azores archipelago represent the only known example of parthenogenesis in the order Odonata. In this paper, we present results from fieldwork done on the islands of São Miguel, Pico, Santa Maria, and Graciosa, aimed at characterizing population ecology and habitat preferences of this species. Sampling of several ponds in the islands of São Miguel and Pico showed that I. hastata occurred in oligotrophic ponds, but was absent from all eutrophic ponds sampled, many of which have ...
Ceratopogonid midges, referred to Forcipomyia paludis, were recorded from five dragonfly species ... more Ceratopogonid midges, referred to Forcipomyia paludis, were recorded from five dragonfly species in Sardinia, Italy. All ceratopogonids were females and almost all were in the last phase of the gonotrophic cycle (gravid females). Although a parasitic association cannot be excluded, no evidence was obtained of the midge biting activity, neither by direct observation nor indirectly, by detecting the expected lesions on the host cuticle. The attachment to dragonflies of F. paludis (perhaps an autogenous species) might fit well with the hypothesis of a phoretic association which would favour the long range dispersal of the gravid females.
This PDF includes better resolution graphs than the original printed paper, and colour pictures i... more This PDF includes better resolution graphs than the original printed paper, and colour pictures instead of black and white
Literature and personal information on the distribution of I. hastata and other odon. spp. in the... more Literature and personal information on the distribution of I. hastata and other odon. spp. in the Azores is reported. I. hastata and I. pumilio are recorded for the first time from the islands of Corvo and Sao Jorge, respectively. I. hastata appears the most common and abundant sp. and its population is formed by only ♀ ♀ (no ♂ ♂ were ever recorded). The asexual reproduction of these populations was demonstrated by means of laboratory rearing during several generations. The dispersal ability of this sp. and the possible origin of parthenogenesis after its colonisation of the Azores are briefly discussed. The possible causes of threat are identified and the need for conservation measures is outlined.
A new site for L. tetraphylla from Sardinia and 4 from Tuscany are put on record. Some of these a... more A new site for L. tetraphylla from Sardinia and 4 from Tuscany are put on record. Some of these apparently harbour reproductive populations. Selysiothemis nigra is for the first time recorded from Tuscany. Introduction The sites and material examined
Populations of Ischnura hastata found in the Azores archipelago represent the only known example ... more Populations of Ischnura hastata found in the Azores archipelago represent the only known example of parthenogenesis in the order Odonata. In this paper, we present results from fieldwork done on the islands of São Miguel, Pico, Santa Maria, and Graciosa, aimed at characterizing population ecology and habitat preferences of this species. Sampling of several ponds in the islands of São Miguel and Pico showed that I. hastata occurred in oligotrophic ponds, but was absent from all eutrophic ponds sampled, many of which have ...
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Papers by C. Utzeri