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UBC Theses and Dissertations
Biomechanical assessment of adaptive radiation in threespine sticklebacks: (gasterosteus spp.) Law, Tara
Abstract
This study compares the morphological characteristics and swimming performances of a sympatric species pair of threespine stickleback in order to gain an understanding of the processes involved in their divergence. The fishes are young (13,000 years old), morphologically distinct, and inhabit different niches in the lake (Paxton Lake, Texada Island, British Columbia). Experiments were conducted to compare the steady swimming and escape fast-start performances of these fishes. I tested predictions of two hypotheses: 1) Selection has acted on the steady swimming ability of limnetics, and therefore I predicted that limnetics have greater steady swimming performance than benthics. 2) The specialization for steady swimming has compromised the fast-start performance of limnetics; consequently I predicted that benthics have greater fast-start performance than limnetics. As predicted, limnetics had greater steady swimming performance than benthics. The mean regression of the logarithm of fatigue time (F.T.) on swimming speed (U, in body lengths/second) for limnetics [Log (ET.) = 5.24 - 0.46U] was significantly higher (p
Item Metadata
Title |
Biomechanical assessment of adaptive radiation in threespine sticklebacks: (gasterosteus spp.)
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Creator | |
Publisher |
University of British Columbia
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Date Issued |
1994
|
Description |
This study compares the morphological characteristics and swimming performances
of a sympatric species pair of threespine stickleback in order to gain an understanding of the
processes involved in their divergence. The fishes are young (13,000 years old),
morphologically distinct, and inhabit different niches in the lake (Paxton Lake, Texada
Island, British Columbia). Experiments were conducted to compare the steady swimming
and escape fast-start performances of these fishes. I tested predictions of two hypotheses: 1)
Selection has acted on the steady swimming ability of limnetics, and therefore I predicted
that limnetics have greater steady swimming performance than benthics. 2) The
specialization for steady swimming has compromised the fast-start performance of limnetics;
consequently I predicted that benthics have greater fast-start performance than limnetics.
As predicted, limnetics had greater steady swimming performance than benthics. The
mean regression of the logarithm of fatigue time (F.T.) on swimming speed (U, in body
lengths/second) for limnetics [Log (ET.) = 5.24 - 0.46U] was significantly higher (p
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Extent |
1141709 bytes
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Genre | |
Type | |
File Format |
application/pdf
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Language |
eng
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Date Available |
2009-02-26
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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 |
10.14288/1.0087532
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URI | |
Degree | |
Program | |
Affiliation | |
Degree Grantor |
University of British Columbia
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Graduation Date |
1994-05
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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.