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100 1 a| Twomey, Evan,e| author.?| UNAUTHORIZED;

245 10 a| Reproductive isolation and mimetic divergence in the poison frog Ranitomeya imitator /c| by Evan Twomey.;

264 1 a| [Greenville, N.C.] :b| [East Carolina University],c| 2014.;

300 a| 163 pages :b| illustrations (some color), map;

336 a| textb| txt2| rdacontent;

337 a| computerb| c2| rdamedia;

338 a| online resourceb| cr2| rdacarrier;

347 a| text fileb| PDFc| 5.17Mb2| rda;

538 a| System requirements: Adobe Reader.;

538 a| Mode of access: World Wide Web.;

502 b| Ph.D.c| East Carolina Universityd| 2014.;

500 a| Presented to the faculty of the Department of Biology.;

500 a| Advisor: Kyle Summers.;

500 a| Title from PDF t.p. (viewed March 31, 2015).;

520 3 a| Understanding the process of speciation requires examination of various stages of its progress. This work focuses on the early stages of population divergence, where populations of a single species may show varying levels of incipient reproductive isolation. This work focuses on a species of poison frog, Ranitomeya imitator, that has undergone population divergence in color pattern to mimic different model species. This is an example of a Müllerian mimetic radiation, which has led to the establishment of four distinct morphs of R. imitator occurring in different geographic areas. There are two main goals of this research: (1) to examine to what extent (if any), different mimetic morphs are reproductive isolated, and (2) to examine factors influencing variation in the strength of between-morph reproductive isolation. To do this, the work focuses on sampling across three mimetic transition zones. In Chapter 1, by using a combination of color pattern quantification, landscape genetics, and mate choice experiments, results show that a mimetic shift in R. imitator is likely driving incipient speciation among two of these mimetic morphs. In Chapter 2, two additional mimetic transition zones are studied. Results suggest that these mimetic morphs are strongly differentiated in aspects of the mimetic phenotype, but show little neutral genetic divergence, and random mating with respect to mimetic morph at the transition zones, suggesting that mimetic divergence has failed to generate reproductive isolation in the two transition zones studied in this chapter. It is suggested that multifarious selection on both mimetic color-pattern and body size may be responsible for explaining variation in progress toward speciation. In Chapter 3, variation in mating calls among mimetic morphs is studied. While there are shifts in certain aspects of the mating call across two mimetic transition zones, phonotaxis trials indicate that call differences among morphs may not be responsible for generating reproductive isolation. Overall, the this dissertation work supports the idea that mimicry may be driving speciation in Ranitomeya imitator, and provides a basis for future work examining ecological speciation in this system.;

504 a| Includes bibliographical references.;

650 0 a| Dendrobatidaez| Peru.=| ^A842339;

650 0 a| Mimicry (Biology)z| Peru.=| ^A27572;

650 0 a| Speciesz| Peru.=| ^A26277;

653 a| Biology;

700 1 a| Summers, Kylee| degree supervisor.=| ^A1147486;

710 2 a| East Carolina University.b| Department of Biology.=| ^A637467;

856 40 z| Access via ScholarShipu| http://hdl.handle.net/10342/4713;

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999 a| CLICK ON WEB ADDRESSw| ASISc| 1i| 3716408-2001l| HSLELECm| HSLr| Ys| Yt| HEETDu| 2/4/2015x| ETDz| HERESOURCE;

Reproductive isolation and mimetic divergence in the poison frog Ranitomeya imitator / by Evan Twomey.

Author/creator	Twomey, Evan author.
Other author	Summers, Kyle degree supervisor.
Other author	East Carolina University. Department of Biology.
Format	Theses and dissertations
Publication	[Greenville, N.C.] : [East Carolina University], 2014.
Description	163 pages : illustrations (some color), map
Supplemental Content	Access via ScholarShip
Subjects	Dendrobatidae--Peru. Mimicry (Biology)--Peru. Species--Peru.

Summary	Understanding the process of speciation requires examination of various stages of its progress. This work focuses on the early stages of population divergence, where populations of a single species may show varying levels of incipient reproductive isolation. This work focuses on a species of poison frog, Ranitomeya imitator, that has undergone population divergence in color pattern to mimic different model species. This is an example of a Müllerian mimetic radiation, which has led to the establishment of four distinct morphs of R. imitator occurring in different geographic areas. There are two main goals of this research: (1) to examine to what extent (if any), different mimetic morphs are reproductive isolated, and (2) to examine factors influencing variation in the strength of between-morph reproductive isolation. To do this, the work focuses on sampling across three mimetic transition zones. In Chapter 1, by using a combination of color pattern quantification, landscape genetics, and mate choice experiments, results show that a mimetic shift in R. imitator is likely driving incipient speciation among two of these mimetic morphs. In Chapter 2, two additional mimetic transition zones are studied. Results suggest that these mimetic morphs are strongly differentiated in aspects of the mimetic phenotype, but show little neutral genetic divergence, and random mating with respect to mimetic morph at the transition zones, suggesting that mimetic divergence has failed to generate reproductive isolation in the two transition zones studied in this chapter. It is suggested that multifarious selection on both mimetic color-pattern and body size may be responsible for explaining variation in progress toward speciation. In Chapter 3, variation in mating calls among mimetic morphs is studied. While there are shifts in certain aspects of the mating call across two mimetic transition zones, phonotaxis trials indicate that call differences among morphs may not be responsible for generating reproductive isolation. Overall, the this dissertation work supports the idea that mimicry may be driving speciation in Ranitomeya imitator, and provides a basis for future work examining ecological speciation in this system.
General note	Presented to the faculty of the Department of Biology.
General note	Advisor: Kyle Summers.
General note	Title from PDF t.p. (viewed March 31, 2015).
Dissertation note	Ph.D. East Carolina University 2014.
Bibliography note	Includes bibliographical references.
Technical details	System requirements: Adobe Reader.
Technical details	Mode of access: World Wide Web.

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Reproductive isolation and mimetic divergence in the poison frog Ranitomeya imitator / by Evan Twomey.

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