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Spatiotemporal Response of Fish Communities in the Spring River Basin, Arkansas to Chronic Pasture Land-Use.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Spatiotemporal Response of Fish Communities in the Spring River Basin, Arkansas to Chronic Pasture Land-Use./
作者:	Rezac, Calvin Robert.
面頁冊數:	1 online resource (254 pages)
附註:	Source: Masters Abstracts International, Volume: 82-08.
Contained By:	Masters Abstracts International82-08.
標題:	Ecology. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=28265222click for full text (PQDT)
ISBN:	9798569993352

Spatiotemporal Response of Fish Communities in the Spring River Basin, Arkansas to Chronic Pasture Land-Use.
Rezac, Calvin Robert.

Spatiotemporal Response of Fish Communities in the Spring River Basin, Arkansas to Chronic Pasture Land-Use. - 1 online resource (254 pages)

Source: Masters Abstracts International, Volume: 82-08.

Thesis (M.S.)--University of Central Arkansas, 2021.

Includes bibliographical references

The Spring River, located within the Interior Highlands, supports one of the most biodiverse fish faunas (137 species) within Arkansas. However, threats to the fish communities include chronic pasture land-use and potential fish introductions from farm ponds within the watershed. These threats may degrade instream habitats, shift fish community composition to an alternative stable state, and cause biotic homogenization. Spring River fish collections during the 1970s were repeated at 31 sites using seines to examine fish community change over 40 years. This study aimed to address how pasture land-use may influence fish and stream conditions at multiple spatial scales. We also wanted to examine potential relationships between farm ponds and translocated species.The Spring River watershed had the highest fish community persistence (mean = 0.69; range = 0.49-0.84) and stability (mean = 0.59; range = 0.46-0.75) when compared to several recent stream surveys within the Black River System. Community shift and biotic homogenization were detected at small catchments sites (< 500 km2) based on the results of a NMDS (PerMANOVA; p = 0.018) and a PCoA (PERMDISP; p = 0.007). Communities becoming more similar in composition were attributed to tolerant pool-dwelling fish and intolerant benthic fishes which have appeared to increase during the Contemporary period. Although many species expanded notably (> 20%) at sites between the two periods, only one species experienced a notable contraction. Arkansas Saddled Darter (Etheostoma euzonum) decreased at a substantial number of small catchments sites (-5) but remained stable at large catchments sites (> 500 km2). Of the spatial scales examined, pasture at the two smallest scales (local buffer and 3 km upstream mainstem buffer) explained the most variation and was significantly associated with increasing number of tolerant species, number of tolerant species that expanded, % gravel at site, bank angle, and sorting index. The results of our study also demonstrated that farm ponds might contribute to homogenized fish communities. Number of farm ponds (1000 m radius) was positively associated with expanding number of tolerant species and expanding number of translocated species. Compared to other fish community studies with evidence of biotic homogenization, our system differs because of both tolerant and intolerant species additions. Our study is also the first to examine fish community change in the Spring River watershed, and among the first to demonstrate how farm ponds can influence fish communities.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2023

Mode of access: World Wide Web

ISBN: 9798569993352Subjects--Topical Terms:

516476
Ecology.
Subjects--Index Terms:

Biotic homogenizationIndex Terms--Genre/Form:

542853
Electronic books.

Spatiotemporal Response of Fish Communities in the Spring River Basin, Arkansas to Chronic Pasture Land-Use.
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520 $a The Spring River, located within the Interior Highlands, supports one of the most biodiverse fish faunas (137 species) within Arkansas. However, threats to the fish communities include chronic pasture land-use and potential fish introductions from farm ponds within the watershed. These threats may degrade instream habitats, shift fish community composition to an alternative stable state, and cause biotic homogenization. Spring River fish collections during the 1970s were repeated at 31 sites using seines to examine fish community change over 40 years. This study aimed to address how pasture land-use may influence fish and stream conditions at multiple spatial scales. We also wanted to examine potential relationships between farm ponds and translocated species.The Spring River watershed had the highest fish community persistence (mean = 0.69; range = 0.49-0.84) and stability (mean = 0.59; range = 0.46-0.75) when compared to several recent stream surveys within the Black River System. Community shift and biotic homogenization were detected at small catchments sites (< 500 km2) based on the results of a NMDS (PerMANOVA; p = 0.018) and a PCoA (PERMDISP; p = 0.007). Communities becoming more similar in composition were attributed to tolerant pool-dwelling fish and intolerant benthic fishes which have appeared to increase during the Contemporary period. Although many species expanded notably (> 20%) at sites between the two periods, only one species experienced a notable contraction. Arkansas Saddled Darter (Etheostoma euzonum) decreased at a substantial number of small catchments sites (-5) but remained stable at large catchments sites (> 500 km2). Of the spatial scales examined, pasture at the two smallest scales (local buffer and 3 km upstream mainstem buffer) explained the most variation and was significantly associated with increasing number of tolerant species, number of tolerant species that expanded, % gravel at site, bank angle, and sorting index. The results of our study also demonstrated that farm ponds might contribute to homogenized fish communities. Number of farm ponds (1000 m radius) was positively associated with expanding number of tolerant species and expanding number of translocated species. Compared to other fish community studies with evidence of biotic homogenization, our system differs because of both tolerant and intolerant species additions. Our study is also the first to examine fish community change in the Spring River watershed, and among the first to demonstrate how farm ponds can influence fish communities.
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