Degree Type

Thesis

Date of Award

2007

Degree Name

Master of Science

Department

Natural Resource Ecology and Management

First Advisor

David Otis

Abstract

Contaminants, habitat degradation, and the pathogen Batrachochytrium dendrobatidis (Bd) are among suspected culprits for worldwide amphibian declines, however; little field research has been done to examine these factors in the Midwestern US. In 2006 I conducted amphibian surveys at 29 wetlands in north-central Iowa, a region dominated by intensive row crop agriculture. I utilized three survey techniques to document amphibians and used the information-theoretic approach to choose models that best estimated relationships between successful reproduction and species richness, and the parameters: pesticides, nutrients, wetland density, proportion cropland in the landscape, and fish. I collected swab samples from Rana pipiens and tested them for the presence of Bd. Alachlor, phosphate, and fish were negatively associated with successful reproduction of Rana pipiens and alachlor and fish were negatively associated with reproductive success of Pseudacris triseriata. Fish were negatively associated with anuran species richness. I detected Bd on samples from 23% of sites.

DOI

https://doi.org/10.31274/rtd-180813-16009

Publisher

Digital Repository @ Iowa State University, http://lib.dr.iastate.edu/

Copyright Owner

Jennifer Loda

Language

en

Proquest ID

AAI1447551

OCLC Number

213358160

ISBN

9780549335528

File Format

application/pdf

File Size

101 pages

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