Orientador: José Marcelo Rocha Aranha / Tese (doutorado) - Universidade Federal do Paraná, Setor de Ciencias Biológicas, Programa de Pós-Graduaçao em Zoologia. Defesa: Curitiba, 2008 / Inclui bibliografia e anexos / Area de concentraçao: Zoologia / The diets of the Burrowing Owl (Athene cunicularia Molina, 1782) and the Barn
Owl (Tyto alba Scopoli, 1769) were analyzed in seven areas in the City of Curitiba and in
the Municipality of Colombo, State of Paraná, Brazil. A total of 77 owl pellets were
analyzed, from which 1891 prey items were identified, with an estimated biomass of
2701.94 g. The identified prey were distributed among 5 classes, 10 order, 11 families, 5
subfamilies and 8 genera. Dietary analyses were based on the number of consumed prey
items, the estimated biomass of each prey item, the frequency of each prey item in the owl
pellets, and the relative importance of each prey item in the diet according to the Relative
Importance Index of Pinkas (1971). The niche breadth of Levins (1968) was also computed
for the trophic niche of the two owl species. The diet of A. cunicularia includes mainly a
large number and variety of insects, as well as rodents and anurans to a lesser extent. In all
five areas where A. cunicularia was studied, the most abundant and important prey items
were orthopterans. Rodents were mostly murids. There was seasonal variation in the diet of
A. cunicularia, with a larger abundance of arthropods in the rainy seasons. The diet of T.
alba was basically composed of rodents, particularly cricetids, with a lower frequency of
anurans and arthropods. This species seems to display a diet that is more adapted to the
subtropical climate of the region. The differences in the diets among areas are discussed in
terms of the characteristics of each area. / The diets of the Burrowing Owl (Athene cunicularia Molina, 1782) and the Barn
Owl (Tyto alba Scopoli, 1769) were analyzed in seven areas in the City of Curitiba and in
the Municipality of Colombo, State of Paraná, Brazil. A total of 77 owl pellets were
analyzed, from which 1891 prey items were identified, with an estimated biomass of
2701.94 g. The identified prey were distributed among 5 classes, 10 order, 11 families, 5
subfamilies and 8 genera. Dietary analyses were based on the number of consumed prey
items, the estimated biomass of each prey item, the frequency of each prey item in the owl
pellets, and the relative importance of each prey item in the diet according to the Relative
Importance Index of Pinkas (1971). The niche breadth of Levins (1968) was also computed
for the trophic niche of the two owl species. The diet of A. cunicularia includes mainly a
large number and variety of insects, as well as rodents and anurans to a lesser extent. In all
five areas where A. cunicularia was studied, the most abundant and important prey items
were orthopterans. Rodents were mostly murids. There was seasonal variation in the diet of
A. cunicularia, with a larger abundance of arthropods in the rainy seasons. The diet of T.
alba was basically composed of rodents, particularly cricetids, with a lower frequency of
anurans and arthropods. This species seems to display a diet that is more adapted to the
subtropical climate of the region. The differences in the diets among areas are discussed in
terms of the characteristics of each area.
| Identifer | oai:union.ndltd.org:IBICT/oai:dspace.c3sl.ufpr.br:1884/14828 |
| Date | January 2008 |
| Creators | Vitule, Jean Ricardo Simões |
| Contributors | Universidade Federal do Paraná. Setor de Ciências Biológicas. Programa de Pós-Graduação em Zoologia, Aranha, Jose Marcelo Rocha |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/doctoralThesis |
| Format | xviii, 143f. : il., grafs., tabs., application/pdf |
| Source | reponame:Repositório Institucional da UFPR, instname:Universidade Federal do Paraná, instacron:UFPR |
| Rights | info:eu-repo/semantics/openAccess |
| Relation | Disponível em formato digital |
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