Ecosystem Impacts and Space Use of Double-Crested Cormorants in a Southeastern Reservoir System

• Main Author: Moran, Leah L.K.
• Language: EN
• Published: Mississippi State University 2018
• Subjects: Wildlife management
• Online Access: http://pqdtopen.proquest.com/#viewpdf?dispub=10841105

<p> Double-crested Cormorants are expanding their breeding range to historic wintering and migratory regions, such as Guntersville Reservoir in Alabama. This study lends insight into how cormorants breeding in a temperate ecosystem impact plants, trees, soil and bird communities as well as home range and movement of cormorants during the breeding season and whether they reside on this reservoir year-round. Results suggest that breeding cormorants have a negative impact on this ecosystem and do not move far from colony sites. Stable isotopes from cormorants and prey fish suggest that cormorants are migrating from this system after breeding, potentially to a marine source. This study corroborates past studies of negative impacts of cormorant colonies, and provides novel results of how southeastern cormorants use and move on Guntersville Reservoir. This thesis can provide biologists information on how best to control populations and mitigate impacts on this and other similar southeastern systems.</p><p>