Document Detail

Reproductive isolating mechanisms and molecular phylogenetic relationships among Palearctic and Oriental brown frogs.
MedLine Citation:
PMID:  12777828     Owner:  NLM     Status:  MEDLINE    
Crossing experiments were made among various brown frog species and populations collected from Japan, China, Russia and Taiwan. The main purpose of these experiments was to confirm the existence of reproductive isolating mechanisms among Rana pirica from Japan, R. chensinensis from China and R. chensinensis from Russia, and between these three taxa and the other brown frogs distributed in the Palearctic and Oriental regions. It was found that there was no or a slight gametic isolation among the three taxa. While there was a nearly equal number of male and female offspring in the control groups, the hybrid frogs were all males, and completely sterile upon attaining sexual maturity. Thus, each of the Japanese R. pirica and the Russian R. chensinensis is a valid species, distinct from the Chinese R. chensinensis. The phylogenetic tree based on nucleotide sequence data from the mitochondrial 12S and 16S rRNA genes of the Palearctic and Oriental brown frogs showed that the three taxa are included in a cluster together with the other species with 2n=24 chromosomes. The present crossing experiments and molecular data support the hypothesis that each of them is a separate but closely related species.
Masayuki Sumida; Hiroaki Ueda; Midori Nishioka
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Zoological science     Volume:  20     ISSN:  0289-0003     ISO Abbreviation:  Zool. Sci.     Publication Date:  2003 May 
Date Detail:
Created Date:  2003-06-02     Completed Date:  2003-09-29     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  8702287     Medline TA:  Zoolog Sci     Country:  Japan    
Other Details:
Languages:  eng     Pagination:  567-80     Citation Subset:  IM    
Institute for Amphibian Biology, Graduate School of Science, Hiroshima University, Higashihiroshima, Japan.
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MeSH Terms
DNA Primers
Evolution, Molecular
Genetic Variation
Polymerase Chain Reaction
RNA, Ribosomal / genetics*
RNA, Ribosomal, 16S / genetics
Ranidae / classification*,  genetics*
Testis / anatomy & histology
Reg. No./Substance:
0/DNA Primers; 0/RNA, Ribosomal; 0/RNA, Ribosomal, 16S

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