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Ground nesting in recultivated forest habitats - a study with artificial nests

100%

Purger J. J., Meszaros L. A., Purger D.

Acta Ornithologica

2004

tom 39

nr 2

The study was carried out in the outskirts of the town of Pécs (southern Hungary) in a recultivated former coal mine. Bordered by Turkey Oak forests, this open area forms a wedge-shaped clearing in that woodland. Since trees and taller shrubs are rare in the area, it is mainly ground nesting bird species that occur in the clearing. In order to discover whether it is more advantageous to nest in the recultivated area (clearing) than in the nearby forest or at its edges, 150 artificial ground nests were constructed. On 7 May 2002, one quail egg and a plasticine egg of similar size were placed in each of the artificial nests. After a week it was found that 24% of nests in the clearing, 30% of those in the forest edge, and 44% of the ones inside the forest had suffered depredation. The proportions of damaged plasticine and quail eggs inside the forest and at the forest edge were similar, whereas the quail eggs in the clearings were significantly less damaged than plasticine eggs. Of all the experimental eggs, significantly more plasticine eggs (29%) were damaged than quail eggs (17%), which suggests that small-bodied predators are unable to break the quail eggs. 18% of the plasticine eggs attacked, and 72% of the quail eggs attacked were removed from the nest by the predator. Among the predators, small mammals were dominant in the clearing and inside the forest, and birds at the forest edge. Based on the predation of quail eggs, the survival chances of ground nests in the clearing are greater than at the forest edge or inside the forest.

Nest survival in a large river valley: an experiment using artificial nests on an island and bank of Vistula River (Poland)

80%

Zmihorski M., Lewtak J., Brzezinski M., Romanowski J.

Polish Journal of Ecology

2010

tom 58

nr 1

Predation pressure, which varies among habitats, is important factor for selection of nesting sites by birds. We investigated artificial nest depredation on an island 23 ha in size and on the river bank covered by willow-poplar forest and meadows in the middle Vistula river valley, in the spring and autumn 2006. We used polyurethane thrush-size nests placed at three heights (ground, bush and tree) with one quail egg. Each nest was checked twice, 7 and 14 days after the beginning of the experiment, in total 381 nest-inspections was included. Additionally, we live-trapped rodents (data from 510 trapnights included) which are potential predators of broods. We found that the survival rate of artificial nests was higher on the island as compared to the bank. Artificial nests placed on the ground revealed the higher survival rate than the nests placed on trees and bushes. Nest survival rate was higher in the autumn than in the spring. Repeatability of the results (survived vs. depredated) for the first and second 7-day period was high but lower on the island as compared to the bank. The abundance of rodents was higher on the bank during the spring, but no difference was recorded in the autumn. Rodents were also more abundant in the autumn than in the spring. This may indicate that survival rates of nests were not affected by rodents directly.

Ograniczanie wyników

1 Acta Ornithologica

1 Polish Journal of Ecology

1 Brzezinski M.

1 Lewtak J.

1 Meszaros L. A.

1 Purger D.

1 Purger J. J.

1 Romanowski J.

1 Zmihorski M.

1 2010

1 2004

Wyniki wyszukiwania

Ground nesting in recultivated forest habitats - a study with artificial nests

Nest survival in a large river valley: an experiment using artificial nests on an island and bank of Vistula River (Poland)