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Effects of fish on aquatic and terre...

Warmbold, Jerry.

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Effects of fish on aquatic and terrestrial ecosystems.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Effects of fish on aquatic and terrestrial ecosystems./
Author:	Warmbold, Jerry.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2016,
Description:	76 p.
Notes:	Source: Masters Abstracts International, Volume: 55-06.
Contained By:	Masters Abstracts International55-06(E).
Subject:	Ecology. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10131561
ISBN:	9781339893532

Effects of fish on aquatic and terrestrial ecosystems.
Warmbold, Jerry.

Effects of fish on aquatic and terrestrial ecosystems. - Ann Arbor : ProQuest Dissertations & Theses, 2016 - 76 p.

Source: Masters Abstracts International, Volume: 55-06.

Thesis (M.S.)--University of South Dakota, 2016.

Fish predation on larval insects can extend to terrestrial ecosystems by controlling the flux of insects as they emerge to winged adults which can have strong implications for terrestrial insectivores. Until recently, it has been assumed that changes in insect emergence are simply extensions of the benthic insect community. To directly test the effects of fish on aquatic and terrestrial ecosystems, I used experimental enclosures containing various fish densities and foraging strategies and compared them to a fishless control and an ambient control in a backwater of the Missouri River. In controlled fish treatments fish density did not affect insect biomass for either system. However, when compared to the more predator abundant ambient backwater there was a >89% increase in benthic and emerging insects in the enclosures. To test for the effects of fish foraging strategy, fish enclosures were compared to the fishless control. Benthic feeding fish reduced benthic insect biomass by over 90%, which caused a 75% reduction in insect emergence. In contrast, water-column feeders increased benthic biomass by 33%, but caused a 60% decrease in insect emergence. When both species were combined, benthic and emergence biomass was reduced by 55 and 62%, respectively. Both benthic and emerging insect biomass were reduced by >90% compared to the ambient control (with the full fish community). These results support the hypothesis that insect emergence is not always an extension of benthic insect biomass. When only a single fish foraging strategy was present the magnitude difference between insect biomass in either system varied, but when more than one foraging strategy was present, changes in benthic and emerging insects were indifferent. Further understanding of how fish foraging strategies and assemblages impact benthic and emerging insects is crucial in predicting how aquatic and terrestrial ecosystem will be affected.

ISBN: 9781339893532Subjects--Topical Terms:

516476
Ecology.

Effects of fish on aquatic and terrestrial ecosystems.
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245 1 0 $a Effects of fish on aquatic and terrestrial ecosystems.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2016
300 $a 76 p.
500 $a Source: Masters Abstracts International, Volume: 55-06.
500 $a Adviser: Jeff Wesner.
502 $a Thesis (M.S.)--University of South Dakota, 2016.
520 $a Fish predation on larval insects can extend to terrestrial ecosystems by controlling the flux of insects as they emerge to winged adults which can have strong implications for terrestrial insectivores. Until recently, it has been assumed that changes in insect emergence are simply extensions of the benthic insect community. To directly test the effects of fish on aquatic and terrestrial ecosystems, I used experimental enclosures containing various fish densities and foraging strategies and compared them to a fishless control and an ambient control in a backwater of the Missouri River. In controlled fish treatments fish density did not affect insect biomass for either system. However, when compared to the more predator abundant ambient backwater there was a >89% increase in benthic and emerging insects in the enclosures. To test for the effects of fish foraging strategy, fish enclosures were compared to the fishless control. Benthic feeding fish reduced benthic insect biomass by over 90%, which caused a 75% reduction in insect emergence. In contrast, water-column feeders increased benthic biomass by 33%, but caused a 60% decrease in insect emergence. When both species were combined, benthic and emergence biomass was reduced by 55 and 62%, respectively. Both benthic and emerging insect biomass were reduced by >90% compared to the ambient control (with the full fish community). These results support the hypothesis that insect emergence is not always an extension of benthic insect biomass. When only a single fish foraging strategy was present the magnitude difference between insect biomass in either system varied, but when more than one foraging strategy was present, changes in benthic and emerging insects were indifferent. Further understanding of how fish foraging strategies and assemblages impact benthic and emerging insects is crucial in predicting how aquatic and terrestrial ecosystem will be affected.
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