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The parallel evolution of reproductive isolation in threespine sticklebacks Nagel, Laura Maria
Abstract
Reproductive isolation within and between sympatric populations of threespine stickleback was investigated to find evidence for parallel speciation, which is the independent evolution of the same reproductive isolating mechanisms. One of the requirements of parallel speciation is reproductive isolation between descendant populations of sympatric species. Mate choice tests between benthic and limnetic sticklebacks in two lakes were therefore conducted to examine reproductive isolation between them. Strong reproductive isolation was found. The probability of hybridization between limnetic females and benthic males was affected by the size of both the male and the female. I suggest that reproductive isolation based on body size may have evolved as a by-product of natural selection on body size. Mate choice tests within benthic and limnetic forms were conducted to determine if there was reproductive isolation among benthic and limnetic forms from different lakes. I hypothesized that because each form evolved under similar selective regimes, they would not be reproductively isolated. The results supported this hypothesis, although there was a trend in limnetics to prefer mates from their own population. There was no reproductive isolation between benthics from different lakes. Similar reproductive isolating mechanisms therefore arose independently in several lineages, probably as a by-product of natural selection.
Item Metadata
Title |
The parallel evolution of reproductive isolation in threespine sticklebacks
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Creator | |
Publisher |
University of British Columbia
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Date Issued |
1994
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Description |
Reproductive isolation within and between sympatric populations of threespine
stickleback was investigated to find evidence for parallel speciation, which is the independent
evolution of the same reproductive isolating mechanisms. One of the requirements of parallel
speciation is reproductive isolation between descendant populations of sympatric species.
Mate choice tests between benthic and limnetic sticklebacks in two lakes were therefore
conducted to examine reproductive isolation between them. Strong reproductive isolation was
found. The probability of hybridization between limnetic females and benthic males was
affected by the size of both the male and the female. I suggest that reproductive isolation
based on body size may have evolved as a by-product of natural selection on body size.
Mate choice tests within benthic and limnetic forms were conducted to determine if
there was reproductive isolation among benthic and limnetic forms from different lakes. I
hypothesized that because each form evolved under similar selective regimes, they would not
be reproductively isolated. The results supported this hypothesis, although there was a trend
in limnetics to prefer mates from their own population. There was no reproductive isolation
between benthics from different lakes. Similar reproductive isolating mechanisms therefore
arose independently in several lineages, probably as a by-product of natural selection.
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Extent |
1160071 bytes
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Genre | |
Type | |
File Format |
application/pdf
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Language |
eng
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Date Available |
2009-02-28
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Provider |
Vancouver : University of British Columbia Library
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Rights |
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.
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DOI |
10.14288/1.0087479
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URI | |
Degree | |
Program | |
Affiliation | |
Degree Grantor |
University of British Columbia
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Graduation Date |
1994-11
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Campus | |
Scholarly Level |
Graduate
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Aggregated Source Repository |
DSpace
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Item Media
Item Citations and Data
Rights
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.