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| Content Provider | Springer Nature Link |
|---|---|
| Author | Katsoyans, P. Kontodimas, D. C. Stathas, G. J. |
| Copyright Year | 1997 |
| Abstract | Coccinella septempunctata (Coleoptera: Coccinellidae) in Greece is a multivoltine species. In the lowlands, all instars are abundant in spring becoming scarce from July until the end of the warm period of the year; they are absent in winter. In June, mostC. septempunctata adults migrate to mountainous aestivo-hibernation sites. Measurements of the duration of pre-oviposition period in females taken monthly from the summit of Mount Kitheron in central Greece (1993–1994) and transferred to laboratory conditions of high temperature (25°C), long day (16 hrs light/24 hrs), and presence of aphids, indicated that theC. septempunctata females were in diapause during July and August. The diapause gradually terminated from late August to late October and was followed by a period of quiescence extending from November to March of the following year.During the summer diapause, arrest of ovarian development was indicated by immaturity of the ovaries in all sampled females and the complete absence of vitellogenic resorption signs. Also, adults were found with enlarged fat bodies, and the median duration of preoviposition period in females transferred to the above laboratory conditions was 90 days in early July and 82 days in early August. During the period of winter quiescence, arrest of ovarian development was characterized in most samples by immaturity of the ovaries in all females and, in some samples, by the presence of a few females with signs of vitellogenic resorption. In winter, adults were found containing fat body reserves of different levels, and the median preoviposition period of females transferred to optimal breeding conditions was 29 days in early November and 16 days in mid January. Coccinella septempunctata est une espèce multivoltine en Grèce. Le développement actif de tous les stades de développement se déroule au cours du printemps dans les régions basses. Au cours du reste de l’année, les adultes en grande majorité se trouvent en estivo-hivernation aux sommets des montagnes. L’estivo-hivernation des adultes deC. septempunctata provenant du sommet du Mont Kitheron en Grèce centrale passe, successivement, d’une période de diapause, au cours des mois de juillet et août, qui se termine progressivement entre la fin août et la fin octobre, à une période de quiescence hivernale, à partir du mois de novembre jusqu’au mois de mars de l’année suivante.Au cours de la diapause estivale, l’arrêt du développement ovarien a été mis en évidence à travers l’immaturité des ovaires de toutes les femelles et par l’absence complète de signes de régression. De plus, les adultes ont été trouvés avec beaucoup de réserves de graisses et la période de préoviposition pour 50 % des femelles transférées dans des conditions favorables a été de 90 jours au début de juillet et de 82 jours au début août. Pendant la période de quiescence hivernale, l’arrêt du développement ovarien a été caractérisé dans la plupart des échantillons, par l’immaturité des ovaires de toutes les femelles et dans quelques échantillons, par la présence de signes de régression chez quelques femelles. En hiver, les adultes ont été trouvés avec des réserves de graisses en quantités différentes et la période de préoviposition moyenne des femelles transférées dans des conditions favorables a été de 29 jours au début novembre et de 16 jours à la mi-janvier. |
| Starting Page | 483 |
| Ending Page | 491 |
| Page Count | 9 |
| File Format | |
| ISSN | 00138959 |
| Journal | BioControl |
| Volume Number | 42 |
| Issue Number | 4 |
| e-ISSN | 15738248 |
| Language | French |
| Publisher | Springer Netherlands |
| Publisher Date | 1997-01-01 |
| Publisher Place | Dordrecht |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Coccinella septempunctata Coleoptera aestivo-hibernation summer diapause winter quiescence Entomology Plant Pathology Agriculture Animal Ecology Animal Biochemistry Behavioural Sciences |
| Content Type | Text |
| Resource Type | Article |
| Subject | Plant Science Ecology, Evolution, Behavior and Systematics Agricultural and Biological Sciences |
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