Analyzing the diet composition of Lake Trout (Salvelinus namaycush) in Upper Priest Lake
Lake Trout (Salvelinus namaycush) were intentionally introduced to the Priest Lake system in 1925 with the intentions of creating a recreational fishery. As the Lake Trout population increased within this system, the native Bull Trout (Salvelinus confluentus) population began to decline. Possible ne...
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fteasuwashington:oai:dc.ewu.edu:theses-1563 2023-11-05T03:44:43+01:00 Analyzing the diet composition of Lake Trout (Salvelinus namaycush) in Upper Priest Lake Jasper, Coty W. 2019-01-01T08:00:00Z application/pdf https://dc.ewu.edu/theses/560 https://dc.ewu.edu/context/theses/article/1563/viewcontent/Jasper_C_2019.pdf unknown EWU Digital Commons https://dc.ewu.edu/theses/560 https://dc.ewu.edu/context/theses/article/1563/viewcontent/Jasper_C_2019.pdf http://creativecommons.org/licenses/by-nc-nd/4.0/ EWU Masters Thesis Collection Aquaculture and Fisheries Biology text 2019 fteasuwashington 2023-10-10T11:34:36Z Lake Trout (Salvelinus namaycush) were intentionally introduced to the Priest Lake system in 1925 with the intentions of creating a recreational fishery. As the Lake Trout population increased within this system, the native Bull Trout (Salvelinus confluentus) population began to decline. Possible negative impacts of Lake Trout on Bull Trout include direct effects such as predation, or indirect effects, such as resource competition. In this study our objective was to estimate the frequency of piscivory of Lake Trout from Upper Priest Lake and document any possible Lake Trout predation upon Bull Trout in the Upper Priest Lake system. We obtained Lake Trout samples from this system during annual gill netting, which is performed to suppress Lake Trout. We then performed stomach dissections to identify incidents of piscivory. Although Mysis shrimp were predominant prey items, 61 of 133 examined stomachs contained partially digested fish tissue. We then extracted DNA from these tissues and used a species DNA barcode located in the cytochrome oxidase 1 gene of the mitochondrion to identify said fragments. Out of a total of 61 samples 63.4% were identified as Lake Trout; 19.0% were identified as Pygmy Whitefish (Prosopium coulteri); 14.2% were identified as Kokanee Salmon (Onchohynchus nerka); and 1.5% were identified as Yellow Perch (Perca flavescens). Therefore, we suggest that the effects of Lake Trout on Bull Trout are not direct effects, but rather indirect effects such as resource competiton. Text Prosopium coulteri Pygmy whitefish Eastern Washington University: EWU Digital Commons |
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Eastern Washington University: EWU Digital Commons |
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fteasuwashington |
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topic |
Aquaculture and Fisheries Biology |
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Aquaculture and Fisheries Biology Jasper, Coty W. Analyzing the diet composition of Lake Trout (Salvelinus namaycush) in Upper Priest Lake |
topic_facet |
Aquaculture and Fisheries Biology |
description |
Lake Trout (Salvelinus namaycush) were intentionally introduced to the Priest Lake system in 1925 with the intentions of creating a recreational fishery. As the Lake Trout population increased within this system, the native Bull Trout (Salvelinus confluentus) population began to decline. Possible negative impacts of Lake Trout on Bull Trout include direct effects such as predation, or indirect effects, such as resource competition. In this study our objective was to estimate the frequency of piscivory of Lake Trout from Upper Priest Lake and document any possible Lake Trout predation upon Bull Trout in the Upper Priest Lake system. We obtained Lake Trout samples from this system during annual gill netting, which is performed to suppress Lake Trout. We then performed stomach dissections to identify incidents of piscivory. Although Mysis shrimp were predominant prey items, 61 of 133 examined stomachs contained partially digested fish tissue. We then extracted DNA from these tissues and used a species DNA barcode located in the cytochrome oxidase 1 gene of the mitochondrion to identify said fragments. Out of a total of 61 samples 63.4% were identified as Lake Trout; 19.0% were identified as Pygmy Whitefish (Prosopium coulteri); 14.2% were identified as Kokanee Salmon (Onchohynchus nerka); and 1.5% were identified as Yellow Perch (Perca flavescens). Therefore, we suggest that the effects of Lake Trout on Bull Trout are not direct effects, but rather indirect effects such as resource competiton. |
format |
Text |
author |
Jasper, Coty W. |
author_facet |
Jasper, Coty W. |
author_sort |
Jasper, Coty W. |
title |
Analyzing the diet composition of Lake Trout (Salvelinus namaycush) in Upper Priest Lake |
title_short |
Analyzing the diet composition of Lake Trout (Salvelinus namaycush) in Upper Priest Lake |
title_full |
Analyzing the diet composition of Lake Trout (Salvelinus namaycush) in Upper Priest Lake |
title_fullStr |
Analyzing the diet composition of Lake Trout (Salvelinus namaycush) in Upper Priest Lake |
title_full_unstemmed |
Analyzing the diet composition of Lake Trout (Salvelinus namaycush) in Upper Priest Lake |
title_sort |
analyzing the diet composition of lake trout (salvelinus namaycush) in upper priest lake |
publisher |
EWU Digital Commons |
publishDate |
2019 |
url |
https://dc.ewu.edu/theses/560 https://dc.ewu.edu/context/theses/article/1563/viewcontent/Jasper_C_2019.pdf |
genre |
Prosopium coulteri Pygmy whitefish |
genre_facet |
Prosopium coulteri Pygmy whitefish |
op_source |
EWU Masters Thesis Collection |
op_relation |
https://dc.ewu.edu/theses/560 https://dc.ewu.edu/context/theses/article/1563/viewcontent/Jasper_C_2019.pdf |
op_rights |
http://creativecommons.org/licenses/by-nc-nd/4.0/ |
_version_ |
1781705361307205632 |