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Studies of feeding activities of cope-pods in Marion Lake, B.C. McQueen, Donald James
Abstract
The standing crop of the copepod G. b. thomasi Forbes in Marion Lake, B. C, has been recorded during 1966 and 1967. These copepods excysted as stage IV copepodids during April and moulted to adults, which produced eggs in May. The new population developed to the copepodid IV stage by mid-summer, when 85 % of the animals returned to the bottom and encysted. The copepodids of stage IV and V and the adults are predators. In the laboratory, six groups of animals were presented separately to the predator, which preyed most efficiently on cyclopoid nauplii and copepodids, diaptomid nauplii and rotifers; and least efficiently on diaptomid copepodids and cladocera. In the lake, the forms least affected by cyclopoid predation were also the diaptomid copepodids and cladocera. There was a correlation between C. b. thomasi encystment and food shortage, which suggests that food shortage may stimulate encystment of stage IV copepodids.
Item Metadata
Title |
Studies of feeding activities of cope-pods in Marion Lake, B.C.
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Creator | |
Publisher |
University of British Columbia
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Date Issued |
1967
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Description |
The standing crop of the copepod G. b. thomasi Forbes in Marion Lake, B. C, has been recorded during 1966 and 1967. These copepods excysted as stage IV copepodids during April and moulted to adults, which produced eggs in May. The new population developed to the copepodid IV stage by mid-summer, when 85 % of the animals returned to the bottom and encysted. The copepodids of stage IV and V and the adults are predators. In the laboratory, six groups of animals were presented separately to the predator, which preyed most efficiently on cyclopoid nauplii and copepodids, diaptomid nauplii and rotifers; and least efficiently on diaptomid copepodids and cladocera. In the lake, the forms least affected by cyclopoid predation were also the diaptomid copepodids and cladocera. There was a correlation between C. b. thomasi encystment and food shortage, which suggests that food shortage may stimulate encystment of stage IV copepodids.
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Genre | |
Type | |
Language |
eng
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Date Available |
2011-06-29
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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 |
10.14288/1.0104253
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URI | |
Degree | |
Program | |
Affiliation | |
Degree Grantor |
University of British Columbia
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Campus | |
Scholarly Level |
Graduate
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Aggregated Source Repository |
DSpace
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Item Media
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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.