Soricidae, Sorex cinereus, Sorex haydeni, identification, distribution, morphometrics, Iowa mammals, biogeography
Masked shrews (Sorex cinereus) and Hayden's shrews (S. haydeni) are both reported from Iowa, but the two species are difficult to tell apart and their relative distributions in Iowa have been unclear. We took 13 skull measurements and examined 2 qualitative features on more than 300 specimens of Sorex from Iowa. The vast majority of our specimens could be identified easily by cranial measurements, and more than half could be identified by the relative position of the maxillary plate. We found no evidence for intergradation between the two species. Masked shrews are present throughout most of Iowa, whereas Hayden's shrews are restricted largely to the western half of the state. Although Hayden's shrew is found mainly in areas of Iowa where grasslands predominate, we could not identify any clear habitat associations for the two species. Hayden's shrew may reach the eastern limits of its range in the grassland areas of northeastern Iowa.
Journal of the Iowa Academy of Science
© Copyright 2002 by the Iowa Academy of Science, Inc.
Whidden, Howard P.; Ray, Alison W.; and Bowles, John B.
"Identification and Distribution of Masked and Hayden's Shrews (genus Sorex) in Iowa,"
The Journal of the Iowa Academy of Science: JIAS: Vol. 109:
, Article 5.
Available at: http://scholarworks.uni.edu/jias/vol109/iss1/5