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Loss of Forest Cover Leads to Population Isolation in an Imperiled, Headwater-Specialist Fish.

Record Type:	Language materials, manuscript : Monograph/item
Title/Author:	Loss of Forest Cover Leads to Population Isolation in an Imperiled, Headwater-Specialist Fish./
Author:	Culley, Alexis.
Description:	1 online resource (74 pages)
Notes:	Source: Masters Abstracts International, Volume: 85-06.
Contained By:	Masters Abstracts International85-06.
Subject:	Biology. -
Online resource:	click for full text (PQDT)
ISBN:	9798381176100

Loss of Forest Cover Leads to Population Isolation in an Imperiled, Headwater-Specialist Fish.
Culley, Alexis.

Loss of Forest Cover Leads to Population Isolation in an Imperiled, Headwater-Specialist Fish. - 1 online resource (74 pages)

Source: Masters Abstracts International, Volume: 85-06.

Thesis (M.S.)--Austin Peay State University, 2023.

Includes bibliographical references

The imperiled Kentucky Arrow Darter (KAD), Etheostoma spilotum, is endemic to first and second order streams in the upper Kentucky River system and has experienced substantial declines in occurrence and population size over the past several decades. Declines are attributed to extensive habitat degradation, particularly from mining activities and deforestation. To evaluate the potential effects of surface mining and other landscape variables on population connectivity, we performed isolation by resistance and distance models using genetic distance calculated from eleven microsatellite loci and resistance mapping of multiple landscape variables. We created multiple resistance surfaces from landscape variables that are known to influence KAD occurrence, including elevation, presence of dams, stream order, and percent landcover (agriculture, urbanization, forest cover, and surface mining). We created a cumulative resistance surface from the individual surface layers to calculate cumulative resistance among populations using the R package gdistance; resistance values for each variable were assigned from the literature. Cumulative resistance was correlated with FST values using a linear mixed effects model in R package corMLPE. FST values indicated a high level of genetic fixation between KAD populations. Analysis of single and multi-surface resistance modeling showed that decreased forest cover is linked to high genetic differentiation, suggesting that land use practices leading to deforestation, such as surface mining, agriculture, and urbanization, contribute to genetic isolation of KAD populations.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2024

Mode of access: World Wide Web

ISBN: 9798381176100Subjects--Topical Terms:

599573
Biology.
Subjects--Index Terms:

ConservationIndex Terms--Genre/Form:

554714
Electronic books.

Loss of Forest Cover Leads to Population Isolation in an Imperiled, Headwater-Specialist Fish.
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520 $a The imperiled Kentucky Arrow Darter (KAD), Etheostoma spilotum, is endemic to first and second order streams in the upper Kentucky River system and has experienced substantial declines in occurrence and population size over the past several decades. Declines are attributed to extensive habitat degradation, particularly from mining activities and deforestation. To evaluate the potential effects of surface mining and other landscape variables on population connectivity, we performed isolation by resistance and distance models using genetic distance calculated from eleven microsatellite loci and resistance mapping of multiple landscape variables. We created multiple resistance surfaces from landscape variables that are known to influence KAD occurrence, including elevation, presence of dams, stream order, and percent landcover (agriculture, urbanization, forest cover, and surface mining). We created a cumulative resistance surface from the individual surface layers to calculate cumulative resistance among populations using the R package gdistance; resistance values for each variable were assigned from the literature. Cumulative resistance was correlated with FST values using a linear mixed effects model in R package corMLPE. FST values indicated a high level of genetic fixation between KAD populations. Analysis of single and multi-surface resistance modeling showed that decreased forest cover is linked to high genetic differentiation, suggesting that land use practices leading to deforestation, such as surface mining, agriculture, and urbanization, contribute to genetic isolation of KAD populations.
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