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  E-mail Message: I thought you might be interested in this item at http://www.worldcat.org/oclc/104566374 Title: Rana pipiens complex: mating call structure and taxonomy. Publisher: ISBN/ISSN: 0036-8075 OCLC:104566374

  
  

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Rana pipiens complex: mating call structure and taxonomy.

Author:	MJ Littlejohn; RS Oldham
Edition/Format:	Article : English
Publication:	Science (New York, N.Y.) 1968 Nov 29; 162(3857): 1003-5
Database:	From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
Summary:	Geographic variability in call structure indicates that four largely allopatric populations of leopard frogs are present in the central United States. These forms appear to maintain their distinctness in narrow zones of sympatry, and most adult males can be separated morphologically. It is suggested that the four forms represent distinct species and that the idea of gradual clinal variability in one wide-ranging species is wrong.  Read more...
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