gray treefrogs, Hy/a versicolor, Hy/a chrysoscelis, Iowa frogs
Historically, the tetraploid and diploid species pair of gray treefrogs, Hyla versicolor and Hyla chrysoscelis, were mapped collectively in Iowa because no macroscopic morphological characteristics useful in recognizing the two species had been found. The present study reports identification and separation of the species by counts of nucleoli in the palpebral membrane of the eye and by measurement of scanning electron micrographs of toepad epithelial projections. Subsequent morphometric data confirm that the two species are morphologically distinct in Iowa but that overlap in characters continues to make macroscopic morphology unreliable for identifying individuals. H. chrysoscelis is distributed sporadically though all but the northeastern quarter of Iowa, while H. versicolor is found roughly southeast of a diagonal line extending from the northeastern to the southwestern corner of the state. A genetically different population appears to reside in Cherokee Co. Iowa.
Journal of the Iowa Academy of Science
© Copyright 2001 by the Iowa Academy of Science, Inc.
Oberfoell, Catherine E. C. and Christiansen, James L.
"Identification and Distribution of the Treefrogs Hyla versicolor and Hyla chrysoscelis in Iowa,"
Journal of the Iowa Academy of Science: JIAS: Vol. 108:
, Article 4.
Available at: http://scholarworks.uni.edu/jias/vol108/iss3/4