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Ecology and breeding behavior of the white-tailed hawk on the northern coastal prairies of Texas
dc.contributor.advisor | Arnold, Keith A. | |
dc.creator | Farquhar, Charles Craig | |
dc.date.accessioned | 2020-09-02T21:04:20Z | |
dc.date.available | 2020-09-02T21:04:20Z | |
dc.date.issued | 1986 | |
dc.identifier.uri | https://hdl.handle.net/1969.1/DISSERTATIONS-21927 | |
dc.description | Typescript (photocopy). | en |
dc.description.abstract | I examined the ecology and breeding biology of a population of white-tailed hawks (Buteo albicaudatus hypospodius; 6 pairs, 1983, 1984; 7 pairs 1985) at the Attwater Prairie Chicken National Wildlife Refuge in Colorado County, Texas. The hawks nested almost exclusively (18/20 nests) in Macartney rose (Rosa bracteata). Incubation periods ranged from 29-32 days (x = 31.2 da.; Mar-Apr) and fledging occurred at 7-7.5 weeks (May-Jun). The fledglings were dependent upon their parents for up to 7 months after leaving the nest. Adults typically chased the immatures away at the onset of the breeding season. Subadult hawks occasionally returned to their natal territories. Utilization distributions (70%), were estimated using sight locations from 10 pairs of adults (1984-1985) and radio locations from 2 of the immatures (1984). Immatures dramatically increased their home ranges over their first 7 months of flight (37 ha-147 ha, x = 59 ha for bird #9; 16 ha-199 ha, x = 72 ha for bird #14). Home ranges of adult males were nearly 3 times larger than those of females during the breeding season (males, x = 33 ha, females, x = 14 ha, 1984; males, x = 34 ha, females, x = 13 ha, 1985). Males increased and females decreased their home ranges after the onset of incubation. All pairs always copulated and always laid eggs. Nesting success was high in 1983 (100%) and 1985 (100%) and lower in 1984 (71%). Breeding adults performed an interesting behavior which may function in courtship or pair bonding, not previously described, involving placing of long woody stems or branches up to 2.5 m in length on nests. I recorded 1 instance of renesting when 1 egg was abandoned early in the season; the pair fledged 2 young later in the season. Time-activity data suggest this species alters the length of its daily incubation sessions, possibly in accordance with temperature. From field observations, I noted distinct intersexual variation in alarm calls which is useful in field-sexing. Prey taxa are variable: biomass is composed chiefly of small mammals, birds, and reptiles. | en |
dc.format.extent | x, 71 leaves | en |
dc.format.medium | electronic | en |
dc.format.mimetype | application/pdf | |
dc.language.iso | eng | |
dc.rights | This thesis was part of a retrospective digitization project authorized by the Texas A&M University Libraries. Copyright remains vested with the author(s). It is the user's responsibility to secure permission from the copyright holder(s) for re-use of the work beyond the provision of Fair Use. | en |
dc.rights.uri | http://rightsstatements.org/vocab/InC/1.0/ | |
dc.subject | Major wildlife and fisheries sciences | en |
dc.subject.classification | 1986 Dissertation F238 | |
dc.subject.lcsh | Hawks | en |
dc.subject.lcsh | Ecology | en |
dc.subject.lcsh | Hawks | en |
dc.subject.lcsh | Reproduction | en |
dc.title | Ecology and breeding behavior of the white-tailed hawk on the northern coastal prairies of Texas | en |
dc.type | Thesis | en |
thesis.degree.grantor | Texas A&M University | en |
thesis.degree.name | Doctor of Philosophy | en |
thesis.degree.name | Ph. D | en |
dc.contributor.committeeMember | Odom, Ted W. | |
dc.contributor.committeeMember | Silvy, Nova J. | |
dc.contributor.committeeMember | Slack, R. Douglas | |
dc.type.genre | dissertations | en |
dc.type.material | text | en |
dc.format.digitalOrigin | reformatted digital | en |
dc.publisher.digital | Texas A&M University. Libraries | |
dc.identifier.oclc | 17963696 |
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