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Geographic Variation in Advertisement Calls in a Tree Frog Species: Gene Flow and Selection Hypotheses

BACKGROUND: In a species with a large distribution relative to its dispersal capacity, geographic variation in traits may be explained by gene flow, selection, or the combined effects of both. Studies of genetic diversity using neutral molecular markers show that patterns of isolation by distance (I...

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Autores principales: Jang, Yikweon, Hahm, Eun Hye, Lee, Hyun-Jung, Park, Soyeon, Won, Yong-Jin, Choe, Jae C.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Public Library of Science 2011
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3157349/
https://www.ncbi.nlm.nih.gov/pubmed/21858061
http://dx.doi.org/10.1371/journal.pone.0023297
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author Jang, Yikweon
Hahm, Eun Hye
Lee, Hyun-Jung
Park, Soyeon
Won, Yong-Jin
Choe, Jae C.
author_facet Jang, Yikweon
Hahm, Eun Hye
Lee, Hyun-Jung
Park, Soyeon
Won, Yong-Jin
Choe, Jae C.
author_sort Jang, Yikweon
collection PubMed
description BACKGROUND: In a species with a large distribution relative to its dispersal capacity, geographic variation in traits may be explained by gene flow, selection, or the combined effects of both. Studies of genetic diversity using neutral molecular markers show that patterns of isolation by distance (IBD) or barrier effect may be evident for geographic variation at the molecular level in amphibian species. However, selective factors such as habitat, predator, or interspecific interactions may be critical for geographic variation in sexual traits. We studied geographic variation in advertisement calls in the tree frog Hyla japonica to understand patterns of variation in these traits across Korea and provide clues about the underlying forces for variation. METHODOLOGY: We recorded calls of H. japonica in three breeding seasons from 17 localities including localities in remote Jeju Island. Call characters analyzed were note repetition rate (NRR), note duration (ND), and dominant frequency (DF), along with snout-to-vent length. RESULTS: The findings of a barrier effect on DF and a longitudinal variation in NRR seemed to suggest that an open sea between the mainland and Jeju Island and mountain ranges dominated by the north-south Taebaek Mountains were related to geographic variation in call characters. Furthermore, there was a pattern of IBD in mitochondrial DNA sequences. However, no comparable pattern of IBD was found between geographic distance and call characters. We also failed to detect any effects of habitat or interspecific interaction on call characters. CONCLUSIONS: Geographic variations in call characters as well as mitochondrial DNA sequences were largely stratified by geographic factors such as distance and barriers in Korean populations of H. japoinca. Although we did not detect effects of habitat or interspecific interaction, some other selective factors such as sexual selection might still be operating on call characters in conjunction with restricted gene flow.
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spelling pubmed-31573492011-08-19 Geographic Variation in Advertisement Calls in a Tree Frog Species: Gene Flow and Selection Hypotheses Jang, Yikweon Hahm, Eun Hye Lee, Hyun-Jung Park, Soyeon Won, Yong-Jin Choe, Jae C. PLoS One Research Article BACKGROUND: In a species with a large distribution relative to its dispersal capacity, geographic variation in traits may be explained by gene flow, selection, or the combined effects of both. Studies of genetic diversity using neutral molecular markers show that patterns of isolation by distance (IBD) or barrier effect may be evident for geographic variation at the molecular level in amphibian species. However, selective factors such as habitat, predator, or interspecific interactions may be critical for geographic variation in sexual traits. We studied geographic variation in advertisement calls in the tree frog Hyla japonica to understand patterns of variation in these traits across Korea and provide clues about the underlying forces for variation. METHODOLOGY: We recorded calls of H. japonica in three breeding seasons from 17 localities including localities in remote Jeju Island. Call characters analyzed were note repetition rate (NRR), note duration (ND), and dominant frequency (DF), along with snout-to-vent length. RESULTS: The findings of a barrier effect on DF and a longitudinal variation in NRR seemed to suggest that an open sea between the mainland and Jeju Island and mountain ranges dominated by the north-south Taebaek Mountains were related to geographic variation in call characters. Furthermore, there was a pattern of IBD in mitochondrial DNA sequences. However, no comparable pattern of IBD was found between geographic distance and call characters. We also failed to detect any effects of habitat or interspecific interaction on call characters. CONCLUSIONS: Geographic variations in call characters as well as mitochondrial DNA sequences were largely stratified by geographic factors such as distance and barriers in Korean populations of H. japoinca. Although we did not detect effects of habitat or interspecific interaction, some other selective factors such as sexual selection might still be operating on call characters in conjunction with restricted gene flow. Public Library of Science 2011-08-17 /pmc/articles/PMC3157349/ /pubmed/21858061 http://dx.doi.org/10.1371/journal.pone.0023297 Text en Jang et al. http://creativecommons.org/licenses/by/4.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.
spellingShingle Research Article
Jang, Yikweon
Hahm, Eun Hye
Lee, Hyun-Jung
Park, Soyeon
Won, Yong-Jin
Choe, Jae C.
Geographic Variation in Advertisement Calls in a Tree Frog Species: Gene Flow and Selection Hypotheses
title Geographic Variation in Advertisement Calls in a Tree Frog Species: Gene Flow and Selection Hypotheses
title_full Geographic Variation in Advertisement Calls in a Tree Frog Species: Gene Flow and Selection Hypotheses
title_fullStr Geographic Variation in Advertisement Calls in a Tree Frog Species: Gene Flow and Selection Hypotheses
title_full_unstemmed Geographic Variation in Advertisement Calls in a Tree Frog Species: Gene Flow and Selection Hypotheses
title_short Geographic Variation in Advertisement Calls in a Tree Frog Species: Gene Flow and Selection Hypotheses
title_sort geographic variation in advertisement calls in a tree frog species: gene flow and selection hypotheses
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3157349/
https://www.ncbi.nlm.nih.gov/pubmed/21858061
http://dx.doi.org/10.1371/journal.pone.0023297
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