Aspects of the Feeding Ecology of the Bonneville Cisco of Bear Lake, Utah-Idaho
The Bonneville cisco (Prospium gemmiferum), a small planktivorous whitefish, is an important part of the distinctive fish community of Bear Lake, Utah-Idaho. The Bonneville cisco plays a key role in the trophic structure by converting zooplankton to fish biomass and providing a major forage source f...
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ftutahsudc:oai:digitalcommons.usu.edu:etd-5419 2023-06-11T04:17:38+02:00 Aspects of the Feeding Ecology of the Bonneville Cisco of Bear Lake, Utah-Idaho Lentz, David C. 1986-05-01T07:00:00Z application/pdf https://digitalcommons.usu.edu/etd/4398 https://doi.org/10.26076/5d4e-f6ea https://digitalcommons.usu.edu/context/etd/article/5419/viewcontent/1986_Lentz_David.pdf unknown DigitalCommons@USU https://digitalcommons.usu.edu/etd/4398 doi:10.26076/5d4e-f6ea https://digitalcommons.usu.edu/context/etd/article/5419/viewcontent/1986_Lentz_David.pdf Copyright for this work is held by the author. Transmission or reproduction of materials protected by copyright beyond that allowed by fair use requires the written permission of the copyright owners. Works not in the public domain cannot be commercially exploited without permission of the copyright owner. Responsibility for any use rests exclusively with the user. For more information contact digitalcommons@usu.edu. All Graduate Theses and Dissertations Aspects Feeding Ecology Bonneville Cisco Bear Lake Utah-Idaho Aquaculture and Fisheries text 1986 ftutahsudc https://doi.org/10.26076/5d4e-f6ea 2023-05-04T17:38:39Z The Bonneville cisco (Prospium gemmiferum), a small planktivorous whitefish, is an important part of the distinctive fish community of Bear Lake, Utah-Idaho. The Bonneville cisco plays a key role in the trophic structure by converting zooplankton to fish biomass and providing a major forage source for cutthroat and lake trout. Aspects of cisco feeding ecology studied include characterization of the zooplankton community composition and dynamics and cisco feeding habits and prey selection. Composition and seasonal dynamics of the zooplankton community were determined for a fifteen month period during 1981-1982. The community was dominated by a calanoid copepod, Epischura, and a colonial rotifer, Conochilus. Cladocerans, primarily Bosmina and Diaphanosoma, comprised only a minor portion of the community, never exceeding five percent. The diel vertical distribution of the zooplankton was examined during five months in 1981. Zooplankton were concentrated in the epilimnion and metalimnion and no evidence of diel vertical migration was detected with the 10 m depth interval sampling scheme used. Some cladocerans were found to utilize refuges in the epilimnion and hypolimnion to avoid intense predation pressure by cisco. Food habits and prey selection of cisco were examined during five months of 1981. Changes in the zooplankton community were reflected by changes in the food composition of cisco from previously reported studies in 1943. The dominant zooplankter, Epischura, remained an important food item for cisco. Departing from historical information, cladocerans like Diaphanosoma and Daphnia were major food items during periods of seasonal peak abundance. Cladocerans were consistently the most preferred prey items, being utilized in greater proportion than their abundance in the plankton. Also, cladocerans and copepods were nearly always preyed on in size-selective fashion. Cisco were brought into the laboratory to determine feeding modes they used to capture prey. The reactive distance, or the minimum distance at ... Text Copepods Rotifer Utah State University: DigitalCommons@USU |
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Utah State University: DigitalCommons@USU |
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unknown |
topic |
Aspects Feeding Ecology Bonneville Cisco Bear Lake Utah-Idaho Aquaculture and Fisheries |
spellingShingle |
Aspects Feeding Ecology Bonneville Cisco Bear Lake Utah-Idaho Aquaculture and Fisheries Lentz, David C. Aspects of the Feeding Ecology of the Bonneville Cisco of Bear Lake, Utah-Idaho |
topic_facet |
Aspects Feeding Ecology Bonneville Cisco Bear Lake Utah-Idaho Aquaculture and Fisheries |
description |
The Bonneville cisco (Prospium gemmiferum), a small planktivorous whitefish, is an important part of the distinctive fish community of Bear Lake, Utah-Idaho. The Bonneville cisco plays a key role in the trophic structure by converting zooplankton to fish biomass and providing a major forage source for cutthroat and lake trout. Aspects of cisco feeding ecology studied include characterization of the zooplankton community composition and dynamics and cisco feeding habits and prey selection. Composition and seasonal dynamics of the zooplankton community were determined for a fifteen month period during 1981-1982. The community was dominated by a calanoid copepod, Epischura, and a colonial rotifer, Conochilus. Cladocerans, primarily Bosmina and Diaphanosoma, comprised only a minor portion of the community, never exceeding five percent. The diel vertical distribution of the zooplankton was examined during five months in 1981. Zooplankton were concentrated in the epilimnion and metalimnion and no evidence of diel vertical migration was detected with the 10 m depth interval sampling scheme used. Some cladocerans were found to utilize refuges in the epilimnion and hypolimnion to avoid intense predation pressure by cisco. Food habits and prey selection of cisco were examined during five months of 1981. Changes in the zooplankton community were reflected by changes in the food composition of cisco from previously reported studies in 1943. The dominant zooplankter, Epischura, remained an important food item for cisco. Departing from historical information, cladocerans like Diaphanosoma and Daphnia were major food items during periods of seasonal peak abundance. Cladocerans were consistently the most preferred prey items, being utilized in greater proportion than their abundance in the plankton. Also, cladocerans and copepods were nearly always preyed on in size-selective fashion. Cisco were brought into the laboratory to determine feeding modes they used to capture prey. The reactive distance, or the minimum distance at ... |
format |
Text |
author |
Lentz, David C. |
author_facet |
Lentz, David C. |
author_sort |
Lentz, David C. |
title |
Aspects of the Feeding Ecology of the Bonneville Cisco of Bear Lake, Utah-Idaho |
title_short |
Aspects of the Feeding Ecology of the Bonneville Cisco of Bear Lake, Utah-Idaho |
title_full |
Aspects of the Feeding Ecology of the Bonneville Cisco of Bear Lake, Utah-Idaho |
title_fullStr |
Aspects of the Feeding Ecology of the Bonneville Cisco of Bear Lake, Utah-Idaho |
title_full_unstemmed |
Aspects of the Feeding Ecology of the Bonneville Cisco of Bear Lake, Utah-Idaho |
title_sort |
aspects of the feeding ecology of the bonneville cisco of bear lake, utah-idaho |
publisher |
DigitalCommons@USU |
publishDate |
1986 |
url |
https://digitalcommons.usu.edu/etd/4398 https://doi.org/10.26076/5d4e-f6ea https://digitalcommons.usu.edu/context/etd/article/5419/viewcontent/1986_Lentz_David.pdf |
genre |
Copepods Rotifer |
genre_facet |
Copepods Rotifer |
op_source |
All Graduate Theses and Dissertations |
op_relation |
https://digitalcommons.usu.edu/etd/4398 doi:10.26076/5d4e-f6ea https://digitalcommons.usu.edu/context/etd/article/5419/viewcontent/1986_Lentz_David.pdf |
op_rights |
Copyright for this work is held by the author. Transmission or reproduction of materials protected by copyright beyond that allowed by fair use requires the written permission of the copyright owners. Works not in the public domain cannot be commercially exploited without permission of the copyright owner. Responsibility for any use rests exclusively with the user. For more information contact digitalcommons@usu.edu. |
op_doi |
https://doi.org/10.26076/5d4e-f6ea |
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1768376987576958976 |