2020:groups:g5:start
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2020:groups:g5:start [2020/01/10 15:46] – [Questions & Suggestions] sudbrack | 2020:groups:g5:start [2020/01/11 17:04] – mendes | ||
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**Group 5** | **Group 5** | ||
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- | Invasions of whitefly //B. tabaci// (left imagem, from Wikipedia) destroy plantations in the south of USA, Australia, China, among other countries. Several mechanisms have been isolated and tested in an experimental settings to reveal their contribution to invasion. | + | Invasions of the whitefly //Bemisia |
- | Twelve different biotypes of whitefly have already been distinguished through | + | Twelve different biotypes of whitefly have already been distinguished through |
- | + | ||
- | Interestingly, | + | |
Liu //et al.// detected significant changes in sex ratio in both the indigenous and alien populations in both regions. In China, when populations of either B or ZHJ1 occurred alone, B usually had female | Liu //et al.// detected significant changes in sex ratio in both the indigenous and alien populations in both regions. In China, when populations of either B or ZHJ1 occurred alone, B usually had female | ||
- | ratios of 60~70%, which were higher than the 50~60% female ratios in ZHJ1. Very similar results also happened to AN biotype. This difference was even higher when the two different biotypes coexisted during the invasions. Then, the same group, | + | ratios of 60~70%, which were higher than the 50~60% female ratios in ZHJ1. Very similar results also happened to AN biotype. This difference was even higher when the two different biotypes coexisted during the invasions. Then, the same researchers |
- | Scientists noticed some interference behavior in whiteflies was acting as a mechanism to change sex ratios within biotypes. Although identification of the progeny produced using nuclear DNA markers detected no hybrids, demonstrating reproductive isolation | + | Interestingly, mating experiments |
- | production of female progeny by increasing its frequency | + | |
- | This manipulation happened when two males from different biotypes and a female | + | |
- | The most significant changes occur in the following scenarios (data from Supporting Online Material | + | This manipulation happens, literally, as a third wheel - the different biotype is able to court the female, but not to copulate with her. Moreover, copulation by indigenous individuals is partly blocked by B males that readily attempt to court with females |
- | * (B♂)(B♀): | ||
- | * (B♂)(B♀)(B♂): | ||
- | * (B♂)(B♀)(Z♂): | ||
- | * (Z♂)(Z♀): | + | ===== Assignment ===== |
- | * (Z♂)(Z♀)(B♂): | + | |
- | * (Z♂)(Z♀)(Z♂): | + | |
- | Similar behavior to data occurred with B and AN biotypes, although numbers changed. Moreover, copulation by indigenous individuals is partly blocked by B males that readily attempt | + | Propose |
- | + | ===== Suggested questions | |
- | + | ||
- | ===== Assignment | + | |
- | Propose a mathematical model at the level of populations to investigate the strategy | + | - Which conditions |
- | + | - Which conditions verify the sex ratio shifts, given this mating behavior and the fact that whiteflies are haplodiploid? | |
- | ===== Questions & Suggestions ===== | + | |
- | | + | Further well-grounded questions from the group are welcome. |
- | - Can you reproduce the sex ratio shifts based on mating bahavior and the fact that whiteflies are haploids? | ||
===== References ===== | ===== References ===== | ||
Shu-Sheng Liu, P. J. De Barro, Jing Xu, Jun-Bo Luan, Lian-Sheng Zang, Yong-Ming Ruan, Fang-Hao Wan. **Asymmetric Mating Interactions Drive Widespread Invasion and Displacement in a Whitefly** Science (2007), Vol. 318, Issue 5857, pp. 1769-1772. [[https:// | Shu-Sheng Liu, P. J. De Barro, Jing Xu, Jun-Bo Luan, Lian-Sheng Zang, Yong-Ming Ruan, Fang-Hao Wan. **Asymmetric Mating Interactions Drive Widespread Invasion and Displacement in a Whitefly** Science (2007), Vol. 318, Issue 5857, pp. 1769-1772. [[https:// | ||
2020/groups/g5/start.txt · Last modified: 2024/01/09 18:45 by 127.0.0.1