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Characterizing the Phenotypic and Ge...

Oliveira, Daniel Rodrigues.

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Characterizing the Phenotypic and Genomic Divergence in Lake-Stream Rainbow Darters (Etheostoma caeruleum).

Record Type:	Electronic resources : Monograph/item
Title/Author:	Characterizing the Phenotypic and Genomic Divergence in Lake-Stream Rainbow Darters (Etheostoma caeruleum)./
Author:	Oliveira, Daniel Rodrigues.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2020,
Description:	81 p.
Notes:	Source: Masters Abstracts International, Volume: 81-12.
Contained By:	Masters Abstracts International81-12.
Subject:	Biology. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=27996925
ISBN:	9798635206034

Characterizing the Phenotypic and Genomic Divergence in Lake-Stream Rainbow Darters (Etheostoma caeruleum).
Oliveira, Daniel Rodrigues.

Characterizing the Phenotypic and Genomic Divergence in Lake-Stream Rainbow Darters (Etheostoma caeruleum). - Ann Arbor : ProQuest Dissertations & Theses, 2020 - 81 p.

Source: Masters Abstracts International, Volume: 81-12.

Thesis (M.S.)--Clark University, 2020.

This item must not be sold to any third party vendors.

In freshwater systems, lake and stream habitats represent heterogeneous environments selecting for population differentiation and increased intraspecific diversity. Continued divergence owing to differential abiotic (flow) and biotic (predation) conditions can lead to the formation of ecotypes. The rainbow darter (Etheostoma caeruleum) is a widespread, stream-inhabiting species of darter that has surprisingly occupied Gull Lake, a glacial lake in Southwest Michigan. To identify whether this represents a uniquely adapted population of rainbow darters, I conducted phenotypic assays and genomic analyses to determine whether this population can be considered a derived ecotype. I used geometric morphometrics to determine broad differences in morphology between lake and stream individuals, while also conducting a standard emergence boldness assay to determine differential behavioral patterns between individuals in each habitat. Finally, I characterized neutral genetic diversity and putatively adaptive outlier loci using restriction site-associated sequencing (RADseq). Gull Lake individuals displayed reduced body depth, an upward-facing mouth, and were less bold compared to their stream counterparts. Although I was unable to determine the exact relationship of the Gull Lake population in this fine-scale landscape, it does appear that there is ongoing gene flow between the lake and the inlet population. Several putatively adaptive outlier loci were identified between Gull Lake and the grouped stream populations, representing potentially ecologically relevant genes under selection. Given the phenotypic and genomic divergence of Gull Lake individuals, it is likely this a progressing case of ecotypic differentiation in rainbow darters. Extrinsic and intrinsic isolating factors are promoting intraspecific and adaptive diversification in this unique lake population of stream-inhabiting fish. Given the understudied potential for intraspecific variation in facilitating speciation across the darter radiation, further genomic and phenotypic studies are needed to test the generality of this ecological divergence across the rainbow darter distribution.

ISBN: 9798635206034Subjects--Topical Terms:

522710
Biology.
Subjects--Index Terms:

Adaptation

Characterizing the Phenotypic and Genomic Divergence in Lake-Stream Rainbow Darters (Etheostoma caeruleum).
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245 1 0 $a Characterizing the Phenotypic and Genomic Divergence in Lake-Stream Rainbow Darters (Etheostoma caeruleum).
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300 $a 81 p.
500 $a Source: Masters Abstracts International, Volume: 81-12.
500 $a Advisor: Foster, Susan A.;Baker, John A.
502 $a Thesis (M.S.)--Clark University, 2020.
506 $a This item must not be sold to any third party vendors.
520 $a In freshwater systems, lake and stream habitats represent heterogeneous environments selecting for population differentiation and increased intraspecific diversity. Continued divergence owing to differential abiotic (flow) and biotic (predation) conditions can lead to the formation of ecotypes. The rainbow darter (Etheostoma caeruleum) is a widespread, stream-inhabiting species of darter that has surprisingly occupied Gull Lake, a glacial lake in Southwest Michigan. To identify whether this represents a uniquely adapted population of rainbow darters, I conducted phenotypic assays and genomic analyses to determine whether this population can be considered a derived ecotype. I used geometric morphometrics to determine broad differences in morphology between lake and stream individuals, while also conducting a standard emergence boldness assay to determine differential behavioral patterns between individuals in each habitat. Finally, I characterized neutral genetic diversity and putatively adaptive outlier loci using restriction site-associated sequencing (RADseq). Gull Lake individuals displayed reduced body depth, an upward-facing mouth, and were less bold compared to their stream counterparts. Although I was unable to determine the exact relationship of the Gull Lake population in this fine-scale landscape, it does appear that there is ongoing gene flow between the lake and the inlet population. Several putatively adaptive outlier loci were identified between Gull Lake and the grouped stream populations, representing potentially ecologically relevant genes under selection. Given the phenotypic and genomic divergence of Gull Lake individuals, it is likely this a progressing case of ecotypic differentiation in rainbow darters. Extrinsic and intrinsic isolating factors are promoting intraspecific and adaptive diversification in this unique lake population of stream-inhabiting fish. Given the understudied potential for intraspecific variation in facilitating speciation across the darter radiation, further genomic and phenotypic studies are needed to test the generality of this ecological divergence across the rainbow darter distribution.
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