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dc.contributor.advisorArnold, Keith Alan
dc.creatorTelfair, Raymond Clark
dc.description.abstractThis study includes: 1) arrival, range expansion, seasonal distribution, and migration; 2) nesting habitats; 3) food habits; 4) reproduction; 5) population dynamics; 6) pesticide residues; 7) species interrelations; and 8) economic importance. Cattle Egrets first nested in Texas in 1959. Present breeding populations use 49.8% of Texas heronries occurring within their breeding range. Breeding populations include 34.3% in coastal zones, 33.3% in the Trinity River System, and 27.2% in the Sabine, Neches, Brazos, and Red River systems combined. Heronries occupied by the three associated species determine Cattle Egret breeding distribution. Cattle Egrets are the last species to arrive in Texas heronries. Post-breeding juvenile Cattle Egrets in Texas disperse southward and southwestward. Fall migration is gradual, coastward, mainly along flood plains, then southward as far as El Salvador. Cattle Egrets may have entered Texas from eastern Gulf States rather than Central America and Mexico. Inland heronries contain Cattle Egrets and Little Blue Herons, primarily. On coastal islands, Snowy Egrets and Louisiana Herons usually outnumber Cattle Egrets; Little Blue Herons are usually absent. Nest placement is relatively uniform and approximately unilayered. Cattle Egret late-nesting in Texas heronries synchronizes with accumulative increase of pasture-dwelling insects. Nest sites, materials, and construction resemble those of the three associated native ardeids, but Cattle Egrets exhibit less nest-site preference. Cattle Egret clutches average 3.58; average intervals and periods are: between successive eggs (2.04 days), incubation (24.0 days), and hatching (1.7 days). Cattle Egret chicks show sigmoidal growth pattern curves fitting the logistic equation. Few chicks starve. Heronry breeding successes, high to low, are: coastal islands, inland wooded islands, swamps, and woodlands. Estimated annual productivity for Cattle Egrets and Snowy Egrets is 1.2, for Louisiana Herons 0.9, and for Little Blue Herons 0.8...en
dc.format.extent2 volumes (xxvi, 552 leaves)en
dc.rightsThis 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.subjectMajor wildlife and fisheries sciencesen
dc.subject.classification1979 Dissertation T271
dc.subject.lcshCattle egreten
dc.titleThe African Cattle egret in Texas and its relation to the Little blue heron, Snowy egret, and Louisiana heronen
dc.typeThesisen A&M Universityen of Philosophyen
dc.format.digitalOriginreformatted digitalen
dc.publisher.digitalTexas A&M University. Libraries

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