Doctoral theses
Current Record: 2137 of 2443
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| Identifier |
000326649 |
| Title |
Συζευτική δραστηριότητα του δάκου της ελιάς Bactrocera oleae (Rossi) (Diptera:Tephritidae): Χρόνος, διάρκεια σε σχέση με φωτοπερίοδο και θερμοκρασία. Άγρια έντομα, έντομα μακροχρόνιας εργαστηριακής εκτροφής |
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Author
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Ρεμπουλάκης, Πολυχρόνης
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Thesis advisor
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Οικονομόπουλος, Αριστείδης
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| Abstract |
The olive fruit fly is the single insect key pest for olive culture, in the majority of the areas where this is practiced, causing major economic loss during favourable for the insect periods of the year. So far, main control measures against this insect include chemical insecticides, with all the adverse side effects on the produce and the environment.
Experiments related with the sterile insect technique, showed that a considerable degree of mating isolation occurs between wild and laboratory mass-reared insects, due to differential mating time within the day. This could result in failure of this particular methodology. In nature, Bactrocera species mate at the end of the natural photophase, during dusk.
The present thesis aimed at investigating the environmental factors which affect the time of mating activity of the olive fruit fly. Laboratory and wild populations of the insect were studied under various photoperiodic and temperature regimes. Experiments were also conducted in order to clarify the influence of environmental conditions on timing and duration of copulation, and to explore the speed of adaptation in new photoperiods. The inheritance of circadian copulation pattern was also studied.
The present results indicated that:
1) Both wild and laboratory strains of the olive fruit fly mate towards the end of photophase, with the activity of wild flies occurring mostly within 1 ½ - 2 hours before the onset of darkness, while the mating activity of lab insects expanded over 4 ½ hours before the onset of scotophase, respectively.
2) Under long daylight photophase regime, the initiation of copulations tends to occur earlier within the photophase.
3) The duration of copulation (time in copula) increases with that of photophase.
4) Temperature was found to affect strongly the timing and duration of copulations. The combination of temperature with photophase duration affected even stronger the timing of copulation.
5) The above findings apply to both laboratory and wild olive fly strains.
6) Insects adapted their mating timing to a new photoperiodic regime within 24 hours. This makes difficult an absolute synchronization of released and wild population mating activities in SIT methodologies.
7) Ten generations of selection of laboratory strain to early or late within photophase copulation, resulted in no difference when compared with the standard strain mating timing.
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| Language |
Greek |
| Issue date |
2008-03-19 |
| Collection
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School/Department--School of Sciences and Engineering--Department of Biology--Doctoral theses
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Type of Work--Doctoral theses
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| Permanent Link |
https://elocus.lib.uoc.gr//dlib/c/b/b/metadata-dlib-user1214976526-26521.tkl
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| Views |
335 |
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