Scheda di dettaglio – i prodotti della ricerca
| Dato | Valore |
|---|---|
| Title | Adaptations of pupae of Chironomidae (Insecta : Diptera) to oxygen-poor habitats |
| Abstract | Morphological, behavioural and physiological adaptations of chironomid pupae to oxygen-poor habitats, such as the profundal zone of lakes, are discussed. Lentic and oxy-regulator species possess developed respiratory organs (thoracic horns) and an extensive anal fringe to perform respiratory movements, whereas in rheophilic and oxy-conformer species these structures are reduced or absent. This led to the hypothesis that the number of thoracic horn branches, the number of anal macrosetae and the body size could consititute a measure of a species' oxygen requirements. These characters were analyzed in 12 species groups collected in 39 Italian lakes. Numbers were correlated to the optimum value of oxygen level, total phosphorus concentration and transparency calculated for each taxon. Taxa with plumose thoracic horns, extensive anal fringe and large body size (Chironomus) inhabited habitats poorer in oxygen than those inhabited by taxa with less extensive respiratory surface and fringe and small body size (Paratendipes, Polypedilum, Microtendipes). Stictochironomus was less tolerant than expected. Further studies are needed into the physiological adaptations of chironomid pupae. |
| Source | Polish Journal of Ecology 54 (4), pp. 687–693 |
| Keywords | lakesmorphologyautoecologyoxygen depletionbiomonitoringthoracic horn |
| Journal | Polish Journal of Ecology |
| Editor | Polish Academy of Sciences. Institute of Ecology. Publishing Office., Dziekanów Lesny, Polonia |
| Year | 2006 |
| Type | Articolo in rivista |
| Authors | Marziali, Laura; Lencioni, Valeria; Rossaro, Bruno |
| Text | 309636 2006 ISI Web of Science WOS 000243236300014 lakes morphology autoecology oxygen depletion biomonitoring thoracic horn Adaptations of pupae of Chironomidae Insecta Diptera to oxygen poor habitats Marziali, Laura; Lencioni, Valeria; Rossaro, Bruno University of Milan; Museo Tridentino Sci Nat Morphological, behavioural and physiological adaptations of chironomid pupae to oxygen poor habitats, such as the profundal zone of lakes, are discussed. Lentic and oxy regulator species possess developed respiratory organs thoracic horns and an extensive anal fringe to perform respiratory movements, whereas in rheophilic and oxy conformer species these structures are reduced or absent. This led to the hypothesis that the number of thoracic horn branches, the number of anal macrosetae and the body size could consititute a measure of a species oxygen requirements. These characters were analyzed in 12 species groups collected in 39 Italian lakes. Numbers were correlated to the optimum value of oxygen level, total phosphorus concentration and transparency calculated for each taxon. Taxa with plumose thoracic horns, extensive anal fringe and large body size Chironomus inhabited habitats poorer in oxygen than those inhabited by taxa with less extensive respiratory surface and fringe and small body size Paratendipes, Polypedilum, Microtendipes . Stictochironomus was less tolerant than expected. Further studies are needed into the physiological adaptations of chironomid pupae. 54 Articolo in rivista Polish Academy of Sciences. Institute of Ecology. Publishing Office. 1505 2249 Polish Journal of Ecology Polish Journal of Ecology Pol. J. Ecol. laura.marziali MARZIALI LAURA |