Data di Pubblicazione:
2006
Citazione:
Thoracic horn structure in Orthocladiini pupae (Diptera: Chironomidae: Orthocladiinae) / L. Marziali, B. Rossaro. - In: STUDI TRENTINI DI SCIENZE NATURALI - ACTA BIOLOGICA. - ISSN 0392-0542. - 2005:82(2006), pp. 69-76.
Abstract:
The pupal thoracic horn in Chironomidae is a respiratory organ specialized for oxygen adsorption and the horn surface was suggested as a measure of a species’ oxygen requirements. This structure was analyzed in 31 species belonging to the tribe Orthocladiini within the genera
Cricotopus, Eukiefferiella, Orthocladius and Tvetenia. Optima for dissolved oxygen and water temperature were calculated for each
taxon using information from a large database. The species with extensive horn are the most resistant to low oxygen levels and
high temperature, and no significant correlation was detected between horn surface and species optima. The species of the genus
Cricotopus, characterized by reduced thoracic horn, tolerate lower oxygen levels then Orthocladius: it is suggested that higher
tolerance is bound to more frequent respiratory undulations. At taxonomic levels below tribes behavioural and physiological
adaptations more than morphological ones may explain the results
Tipologia IRIS:
01 - Articolo su periodico
Keywords:
pupal stage ; oxygen depletion ; species tolerance ; respiratory movements ; Italian rivers
Elenco autori:
L. Marziali, B. Rossaro
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