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- Title
Life cycle and seasonal regulation of the Ibero-Maghrebian endemic Onychogomphus costae across an altitudinal gradient (Insecta, Odonata).
- Authors
Samraoui, Boudjéma; Touati, Laïd; Samraoui, Farrah
- Abstract
The emergence and life cycle of the Ibero-Maghrebian endemic Onychogomphus costae Selys, 1885, was studied over an altitudinal gradient of the Seybouse River in northeastern Algeria. The asynchronous and protracted emergence period showed a "summer" pattern, extending from late April to mid-August and lasting about three and a half months. The proportion of the total emergence period, EM50, at sea level was unusually long, varying annually between 44 and 66 days. No differences in emergence sex ratios were observed in 2015, but in 2016 there was a statistically significant deviation from a 1:1 ratio in favour of females. In both years, the body size of female exuviae at emergence was consistently larger than that of males. The long flight and oviposition period of O. costae extends throughout spring and summer and is responsible for the phenotypic plasticity of the larvae and the asynchrony of their development. Larval growth and development of O. costae are consistent with regulated development and a semivoltine life cycle across the entire altitudinal gradient of the Seybouse River. Nevertheless, some voltinistic flexibility is evident at low elevations, with some individuals exhibiting a univoltine life cycle.
- Subjects
ALGERIA; LIFE cycles (Biology); RIB cage; ODONATA; INSECTS; PHENOTYPIC plasticity; SEASONS
- Publication
Hydrobiologia, 2023, Vol 850, Issue 21, p4891
- ISSN
0018-8158
- Publication type
Article
- DOI
10.1007/s10750-023-05269-5