The life cycle of Onychogomphus uncatus (Charpentier, 1840) (Odonata: Gomphidae) in the Sierra Morena Mountains (southern Spain): an example of protracted larval development in the Mediterranean basin
Ferreras-Romero, Manuel; Atienzar, M. Dolores; Corbet, Philip S.
Archiv für Hydrobiologie Volume 144 Number 2 (1999), p. 215 - 228
published: Jan 22, 1999
ArtNo. ESP141014402003, Price: 29.00 €
The life cycle of the dragonfly Onychogomphus uncatus was studied for three consecutive years, mainly by systematic sampling of larvae, in a permanent upland stream in southern Spain, towards the southern part of this species' range. During larval development a hatching cohort divides into 'fast' and 'slow' components which respectively complete development in two and three years and correspond in their mode of seasonal regulation to summer and spring species (sensu Corbet 1954). In these respects the life cycle resembles closely that of certain other Odonata near the northern limit of their distribution in the United Kingdom and Sweden. Advanced metamorphosis (in the last larval instar) and emergence were confined to spring and summer respectively, but unusually low autumn temperatures correlated with the appearance in autumn, rather than in winter or spring, of intrastadial changes foreshadowing metamorphosis.