Open Access. Powered by Scholars. Published by Universities.®

Life Sciences Commons

Open Access. Powered by Scholars. Published by Universities.®

Articles 1 - 7 of 7

Full-Text Articles in Life Sciences

Movement Ecology Of An Intercontinental Migratory Bird During Spring Stopover, Emily Beth Cohen Dec 2011

Movement Ecology Of An Intercontinental Migratory Bird During Spring Stopover, Emily Beth Cohen

Dissertations

Movement ecology is a component of nearly all aspects of animal behavior and an animal’s decision to move is likely influenced by a complex combination of exogenous and endogenous factors. Therefore, an examination of the causes and consequences of organismal movement provides a conceptual framework for understanding complex behavioral strategies. My dissertation research is focused on the movement ecology of an intercontinental migratory songbird during spring migration. I adopted experimental approaches to study the factors influencing how a songbird migrant, red-eyed vireos (Vireo olivaceus), makes decisions in unfamiliar landscapes from the initiation of spring stopover.

I simulated the arrival ...


Rocky Mountain Birds: Birds And Birding In The Central And Northern Rockies, Paul A. Johnsgard Nov 2011

Rocky Mountain Birds: Birds And Birding In The Central And Northern Rockies, Paul A. Johnsgard

Zea E-Books

“The Rocky Mountain region has fascinated me ever since I traveled to Glacier and Yellowstone National Parks as a teenager, and saw for the first time such wonderful birds as ospreys, American dippers, and Lew­is’s woodpeckers.”

This book is in part based on the author’s earlier Birds of the Rocky Moun­tains (1986, revised 2009), but over a third of the original text has been eliminated. The rest has been updated, expanded and modified to be less technical and more useful to birders in the field. Bird enthusiasts will find viewing loca­tions and updated contact information ...


Determinants Of Local And Migratory Movements Of Great Lakes Double-Crested Cormorants, Alban Guillaumet, Brian S. Dorr, Guiming Wang, Jimmy D. Taylor Ii, Richard B. Chipman, Heidi Scherr, Jeff Bowman, Kenneth F. Abraham, Terry J. Doyle, Elizabeth Cranker Jun 2011

Determinants Of Local And Migratory Movements Of Great Lakes Double-Crested Cormorants, Alban Guillaumet, Brian S. Dorr, Guiming Wang, Jimmy D. Taylor Ii, Richard B. Chipman, Heidi Scherr, Jeff Bowman, Kenneth F. Abraham, Terry J. Doyle, Elizabeth Cranker

Brian S Dorr

We investigated how individual strategies combine with demographic and ecological factors to determine local and migratory movements in the double-crested cormorants (Phalacrocorax auritus). One hundred and forty-five cormorants were captured from 14 nesting colonies across the Great Lakes area and fitted with satellite transmitters. We first tested the hypotheses that sexual segregation, density-dependent effects, and the intensity of management operations influenced home range size during the breeding season. The influence of these factors appeared to be limited in part due to random variability in foraging and dispersal decisions at individual and colony levels. We also designed a statistical framework to ...


A Nebraska Bird-Finding Guide, Paul A. Johnsgard Apr 2011

A Nebraska Bird-Finding Guide, Paul A. Johnsgard

Zea E-Books

Nebraska lies in the transition zone between North American eastern and western avifaunas and is home to more than 200 breeding and 150 migrant species. This definitive guide to Nebraska birdwatching by the state’s preeminent ornithologist includes a county-by-county rundown of the best sites, a calendar of migrations, an annotated checklist of regularly occurring Nebraska birds, and recommendations for optical equipment, publications and reference materials, and contact information for conservation and ornithological groups. It features 48 maps as well as photographs and drawings by the author.

Paul Johnsgard, Foundation Professor Emeritus of Biological Sciences at the University of Nebraska ...


The Future Of Blue-Winged And Golden-Winged Warblers In Connecticut, Robert A. Askins Apr 2011

The Future Of Blue-Winged And Golden-Winged Warblers In Connecticut, Robert A. Askins

Biology Faculty Publications

No abstract provided.


Distribution Of Bird Reservoir Hosts For West Nile Virus In Montana, Billy Mcelroy Apr 2011

Distribution Of Bird Reservoir Hosts For West Nile Virus In Montana, Billy Mcelroy

Life and Environmental Sciences Undergraduate Theses

West Nile virus (WNv) is an arthropod-borne flavivirus that was first detected in the United States in 1999. By 2004 it had spread to 48 states and, to date, it has been the source of greater than 29,000 cases of human infection. WNv is maintained through an avian-mosquito transmission cycle, with birds serving as the primary vertebrate hosts for the amplification of the virus. Previous studies have shown Passeriform birds to be some of the most virulent competent hosts for the virus, producing adequate viremia counts for continuation of the transmission cycle. Associations were analyzed between mosquito populations and ...


A Comparison Of Ecological Conditions And Relationships In An Altered Wetland And An Unaltered Wetland, Mark Kiyoshi Hurst Jan 2011

A Comparison Of Ecological Conditions And Relationships In An Altered Wetland And An Unaltered Wetland, Mark Kiyoshi Hurst

Graduate Theses and Dissertations

The purpose of the study is to identify and quantify the hydrologic and ecologic differences between two adjacent sections of Colt Creek; one section unaltered and one section altered by clearing and drainage. These differences were measured by monitoring water levels, groundcover vegetation in each of the two areas, and monitoring numbers and species of birds utilizing the two areas. Surface water levels were measured in three locations: in the historic Colt Creek flow way, in the ditch draining the creek, and in an adjacent wetland strand. In addition, a shallow monitor well in the creek was used to measure ...