DIET SPECIALIZATION AND GENERALIZATION TRADEOFFS IN THE MUSTARD HERBIOVRE SCAPTOMYZA FLAVA
Evolutionary tradeoffs occur when the fixation of a beneficial trait reduces the effectiveness of another one. In a complex environment, a population with a highly variable mixture of traits may increase the mean fitness. Specialists on the other hand, may fix alleles optimal in one environment,...
| Main Author: | |
|---|---|
| Other Authors: | |
| Language: | en_US |
| Published: |
The University of Arizona.
2016
|
| Online Access: | http://hdl.handle.net/10150/612560 http://arizona.openrepository.com/arizona/handle/10150/612560 |
| Summary: | Evolutionary tradeoffs occur when the fixation of a beneficial trait reduces the
effectiveness of another one. In a complex environment, a population with a highly
variable mixture of traits may increase the mean fitness. Specialists on the other
hand, may fix alleles optimal in one environment, and thereby give up the benefit of
thriving in a different environment.
My senior thesis study aims to test whether the maintenance of variable traits is
beneficial when the environment is variable and what, if any, tradeoffs arise as a
result of specialization. I created replicated populations of a drosophilid fly species
called Scaptomyza flava and evolved these in three different environments, two
specialized and one generalized, for 10 generations. Emergence time, survival, and
preference for environment were phenotypically tested for the different populations
of flies in all environment types. Emergence time depended on both the
environment in which they developed and on the population from which they came.
This suggests that tradeoffs exist between specialized and generalized populations
that affect their development on both types of environments. |
|---|