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The effects of hydrologic alteration...

Gatlin, Michael R.

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The effects of hydrologic alteration on stream fish community structure in Lee Creek, Oklahoma.

Record Type:	Electronic resources : Monograph/item
Title/Author:	The effects of hydrologic alteration on stream fish community structure in Lee Creek, Oklahoma./
Author:	Gatlin, Michael R.
Description:	96 p.
Notes:	Source: Masters Abstracts International, Volume: 52-03.
Contained By:	Masters Abstracts International52-03(E).
Subject:	Aquatic sciences. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=1547051
ISBN:	9781303478666

The effects of hydrologic alteration on stream fish community structure in Lee Creek, Oklahoma.
Gatlin, Michael R.

The effects of hydrologic alteration on stream fish community structure in Lee Creek, Oklahoma. - 96 p.

Source: Masters Abstracts International, Volume: 52-03.

Thesis (M.S.)--Oklahoma State University, 2013.

Streams are influenced by human activities which can alter those ecosystems and jeopardize their ability to support a diverse array of organisms. In an attempt to mitigate these effects, states, including Oklahoma, enacted laws that preserve select rivers (i.e. scenic rivers) in their free flowing condition. However, these streams may still be vulnerable to perturbations. To determine the effects of anthropogenic impacts on the stream fish community structure in Lee Creek, a scenic river in Oklahoma, I developed and pursued two objectives: 1) determine the current community structure of fishes in relation to habitat and pre-dam fish assemblage and 2) determine to what extent Lee Creek's hydrology has changed since impoundment as well as determine the cause of those changes. Fish were sampled during the summer of 2011, spring 2012, and summer 2012 using backpack electrofishing and gillnets from riffles, runs, glides, and pools. Concurrent with fish sampling, environmental parameters were collected at 5 uniformly-distributed points at each sample site. Relationships between fish and their environments were assessed using canonical correspondence analysis. The pre-impoundment fish community was determined from historic Lee Creek collections. Comparisons between pre- and post-impoundments were made using the Jaccard similarity index. The hydrology in Lee Creek, OK was assessed using Indicators of Hydrologic (IHA) software for pre- (1970-1991) and post-impoundment (1992-2013) periods. Land cover and precipitation patterns within the Lee Creek watershed were investigated to elucidate changes in hydrology. The fish community in Lee Creek, OK has been moderately impacted since impoundment with most species occurring pre- and post-impoundment. Changes in community structure are likely the result of the barrier effect. Furthermore, Lee Creek's hydrology has become flashier and flood events are occurring earlier in the year since impoundment. The altered streamflow appears to be driven by long-term changes in precipitation (i.e., increased rain-event magnitude coupled with decreased rain-event frequency) rather than by land cover or direct effects of the impoundment. The continued influence of the barrier effect, coupled with altered hydrology and precipitation, may have a profound effect on the stream fish community structure in Lee Creek, Oklahoma into the future.

ISBN: 9781303478666Subjects--Topical Terms:

3174300
Aquatic sciences.

The effects of hydrologic alteration on stream fish community structure in Lee Creek, Oklahoma.
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245 1 4 $a The effects of hydrologic alteration on stream fish community structure in Lee Creek, Oklahoma.
300 $a 96 p.
500 $a Source: Masters Abstracts International, Volume: 52-03.
500 $a Adviser: James M. Long.
502 $a Thesis (M.S.)--Oklahoma State University, 2013.
520 $a Streams are influenced by human activities which can alter those ecosystems and jeopardize their ability to support a diverse array of organisms. In an attempt to mitigate these effects, states, including Oklahoma, enacted laws that preserve select rivers (i.e. scenic rivers) in their free flowing condition. However, these streams may still be vulnerable to perturbations. To determine the effects of anthropogenic impacts on the stream fish community structure in Lee Creek, a scenic river in Oklahoma, I developed and pursued two objectives: 1) determine the current community structure of fishes in relation to habitat and pre-dam fish assemblage and 2) determine to what extent Lee Creek's hydrology has changed since impoundment as well as determine the cause of those changes. Fish were sampled during the summer of 2011, spring 2012, and summer 2012 using backpack electrofishing and gillnets from riffles, runs, glides, and pools. Concurrent with fish sampling, environmental parameters were collected at 5 uniformly-distributed points at each sample site. Relationships between fish and their environments were assessed using canonical correspondence analysis. The pre-impoundment fish community was determined from historic Lee Creek collections. Comparisons between pre- and post-impoundments were made using the Jaccard similarity index. The hydrology in Lee Creek, OK was assessed using Indicators of Hydrologic (IHA) software for pre- (1970-1991) and post-impoundment (1992-2013) periods. Land cover and precipitation patterns within the Lee Creek watershed were investigated to elucidate changes in hydrology. The fish community in Lee Creek, OK has been moderately impacted since impoundment with most species occurring pre- and post-impoundment. Changes in community structure are likely the result of the barrier effect. Furthermore, Lee Creek's hydrology has become flashier and flood events are occurring earlier in the year since impoundment. The altered streamflow appears to be driven by long-term changes in precipitation (i.e., increased rain-event magnitude coupled with decreased rain-event frequency) rather than by land cover or direct effects of the impoundment. The continued influence of the barrier effect, coupled with altered hydrology and precipitation, may have a profound effect on the stream fish community structure in Lee Creek, Oklahoma into the future.
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