Degree Type

Thesis

Date of Award

2008

Degree Name

Master of Science

Department

Natural Resource Ecology and Management

Major

Sustainable Agriculture

First Advisor

James L. Pease

Second Advisor

Stephen J. Dinsmore

Third Advisor

Stephen K. Barnhart

Abstract

Grassland bird populations across the Midwest are experiencing declines due to loss of habitat, which could potentially be replaced with grazing systems. This study measured abundance, nesting, and derived conservation values for a rotational stocking grazing management unit where cool-season grass (CSG) paddocks were grazing in the spring and fall and rested in the summer, and warm-season grass (WSG) paddocks were grazed in the summer and rested in spring an fall. Adjacent ungrazed Conservation Reserve Program lands in CSG and WSG served as control treatments. Dickcissels (Spiza americana ) had bird densities in ungrazed WSG fields (3.8+/-0.29 birds/ha) similar to WSG grazed paddocks (3.3+/-4.60 birds/ha). Grasshopper Sparrows (Ammodramus savannarum) and Eastern Meadowlarks ( Sturnella magna) were primarily in grazed areas, but over 50 percent nest losses resulted from cattle disturbance. The grazing management unit provided limited habitat to grassland birds, but has the potential through further management considerations to provide better habitat.

DOI

https://doi.org/10.31274/rtd-180813-6973

Publisher

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

Copyright Owner

Ryan David Marquardt

Language

en

Proquest ID

AAI1453139

OCLC Number

236869037

ISBN

9780549542094

File Format

application/pdf

File Size

98 pages

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