Title Page
 Table of Contents
 List of Tables
 Study areas and methods
 Conclusion and conservation...
 Biographical sketch

Title: Abundance, movement and habitat use of Swainson's hawks in their wintering grounds, Argentina
Full Citation
Permanent Link: http://ufdc.ufl.edu/UF00100685/00001
 Material Information
Title: Abundance, movement and habitat use of Swainson's hawks in their wintering grounds, Argentina
Physical Description: Archival
Language: English
Creator: Canavelli, Sonia Beatriz, 1968- ( Dissertant )
Tanner, George ( Thesis advisor )
Sieving, Kathryn ( Reviewer )
Meyer, Kenneth ( Reviewer )
Publisher: University of Florida
Place of Publication: Gainesville, Fla.
Publication Date: 2000
Copyright Date: 2000
Subjects / Keywords: Wildlife Ecology and Conservation thesis, M.S   ( lcsh )
Dissertations, Academic -- Wildlife Ecology and Conservation -- UF   ( lcsh )
Genre: government publication (state, provincial, terriorial, dependent)   ( marcgt )
bibliography   ( marcgt )
theses   ( marcgt )
non-fiction   ( marcgt )
Abstract: Knowledge of habitat use by a particular species is necessary in developing species conservation plans. Large-scale mortality of Swainson's hawks (Buteo swainsoni) in Argentina during austral summer 1995-96 identified the need to address several questions about relationships between hawks and their wintering ground environment. In 1996, an international and interdisciplinary research project involving numerous institutions and agencies was initiated to understand causes of Swainson's hawk mortality and to prevent future mortality events. A research component addressed questions about the patterns of abundance, movement and habitat use of Swainson's hawks in particular wintering areas. In this study, population abundances, individual movements and habitat use, both at population and individual levels of resolution, were analyzed at a landscape scale in two study areas. These areas were located in La Pampa and Santa Fe provinces of Argentina and the study was conducted in 1996-97 and 1997-98 austral summers. Field methods included systematic surveys, conventional radio tagging of individual hawks and focal observations. Densities of hawks varied between 4.40 and 5.02 hawks/km2 in La Pampa and 3.51 hawk/km2 in Santa Fe, with high variations in these values through the season. Hawks widely dispersed at regional level (far away from the limits of the study area) and used a defined study area with a random pattern, without constituting tight groups or flocks. Finally, both at population and individual levels, hawks selected permanent pastures (for foraging), plowed fields (for sunbathing/resting and sometimes for foraging) and woodlands (for roosting), but their clustered spatial distribution was not associated with the abundance of these selected habitat types. These results reflected similarities in the pattern of habitat use with the breeding areas, and they could be expected from adaptations of a migratory raptor to the dynamic changes of heterogeneous agricultural landscapes, especially in relation to food availability. Patterns of habitat use showed a combination of risk factors that made hawks susceptible to pesticide applications in their wintering ground. In addition, values of population abundance found in this study as well as patterns of movement gave a baseline for the development of conservation measures directed to explore and prevent the incidence of agricultural practices, such as pesticide applications and changes in land use, on populations of Swainson's hawks wintering in the Argentinean pampas.
Subject: Swainson's hawk, Buteo swainsoni, Argentina, habitat use, movement, abundance, wintering grounds, mortalities, migration
Thesis: Thesis (M.S.)--University of Florida, 2000.
Bibliography: Includes bibliographical references (p. 108-118).
System Details: System requirements: World Wide Web browser and PDF reader.
System Details: Mode of access: World Wide Web.
Statement of Responsibility: by Sonia Beatriz Canavelli.
General Note: Title from first page of PDF file.
General Note: Document formatted into pages; contains xiii, 119 p.; also contains graphics.
General Note: Vita.
 Record Information
Bibliographic ID: UF00100685
Volume ID: VID00001
Source Institution: University of Florida
Holding Location: University of Florida
Rights Management: All rights reserved by the source institution and holding location.
Resource Identifier: oclc - 45840324
alephbibnum - 002639306
notis - ANA6132


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Table of Contents
    Title Page
        Page i
        Page ii
        Page iii
        Page iv
        Page v
        Page vi
    Table of Contents
        Page vii
        Page viii
    List of Tables
        Page ix
        Page x
        Page xi
        Page xii
        Page xiii
        Page 1
        Page 2
        Page 3
        Page 4
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        Page 9
        Page 10
        Page 11
        Page 12
        Page 13
        Page 14
        Page 15
    Study areas and methods
        Page 16
        Page 17
        Page 18
        Page 19
        Page 20
        Page 21
        Page 22
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    Conclusion and conservation applications
        Page 102
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    Biographical sketch
        Page 119
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