Use this URL to cite or link to this record in EThOS:
Title: Thermal evolution in Drosophila melanogaster
Author: Barrie, Brian D.
Awarding Body: University of Edinburgh
Current Institution: University of Edinburgh
Date of Award: 1993
Availability of Full Text:
Access from EThOS:
Full text unavailable from EThOS. Please try the link below.
Access from Institution:
The experiments reported in this thesis examined the effects of laboratory thermal selection on a range of characters in two sets of three replicate lines of Drosophila melanogaster, maintained at 16.5°C and 25°C for over four years. The duration of developmental stages in males and females from both selection regimes was greater when reared at 16.5oC than when reared at 25oC. An evolutionary response of development times to temperature was also evident. Times to pupariation of 25oC selected larvae were longer than those of 16.5oC selected larvae, when reared at 16.5oC or 25oC. Times to adult eclosion were longer for 25oC selected lines compared to 16.5oC selected lines, when both were reared at 16.5oC, but the situation was reversed at 25oC. Pre-adult survival was higher in selected lines when they were reared at their own selection temperature. This is clear evidence of rapid thermal evolution and adaptation in the selected lines. Larval growth patterns were also examined. Larvae from both selection regimes reached a higher weight, and took almost twice as long to develop, when reared at 16.5oC rather than 25oC. At both growth temperatures, 16.5oC selected larvae had higher mean weights at almost all sampling intervals in comparison to 25oC selected larvae. Starvation experiments showed that larvae from the thermally selected lines had higher critical weights for pupariation when reared at the temperature at which they had been selected compared to larvae from the other selection regime reared at the same temperature. Results suggested that 16.5oC selected lines may be allocating more nutrients to growth as opposed to somatic maintenance.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available