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Nesting habitat requirements and nestling diet in the Mediterranean populations of Crested Tits Lophophanes cristatus

100%

Atienzar F., Barba E., Holleman L. J. M., Belda E. J.

Acta Ornithologica

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2009

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tom 44

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nr 2

Most bird species show specific habitat requirements for breeding and feeding. We studied the pattern of habitat occupation, nestling diet and breeding performance of Crested Tits Lophophanes cristatus in a "typical" (coniferous) and an "atypical" (Holm Oak Quercus ilex) forest in eastern Spain during 2005-2007. We aimed to determine which microhabitat characteristics in the Holm Oak forest could account for the presence of Crested Tits, and checked whether the nestling diet in the Holm Oak forest resembled that obtained in the pine forest. Vegetation maps were produced using GIS from observations made in the field (tree species, tree and shrub cover). Nestling diet was recorded through video surveillance. Crested Tits bred in mature, low-density areas in the pine forest. Those breeding in the Holm Oak forest built their nests in areas including pine trees and avoided densely forested areas. Birds breeding in the pine forest started laying by mid-April and the average clutch size was 5 eggs. In the Holm Oak forest, birds started laying by the end of April and average clutch size was also 5 eggs. Fledglings weighed around 12 g in both forests. Nestling diet, prey size and feeding frequency by the parents did not vary between the forests. The main prey types consumed were Lepidoptera larvae and Diptera.

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Nestling food of European hole-nesting passerines: do we know enough to test the adaptive hypotheses on breeding seasons?

63%

Cholewa M., Wesolowski T.

Acta Ornithologica

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2011

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tom 46

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nr 2

Hole-nesting passerines constitute a 'model' group for which importance of synchronisation between food availability — mainly caterpillars — and appearance of nestlings is commonly postulated. Is there an adequate set of data allowing one to prove this relationship? The recent climate change could lead to a mis-match between food peaks and nestlings' appearance. Do the data exist that show that the birds have switched to other food sources? We analyse data on nestling food of eleven European hole-nesting passerines (158 papers). The diet of some species is hardly known (< 100 broods observed), there are large gaps in geographical coverage (70% of data from five countries — Germany, Russia, Slovakia/Czech Republic, Poland and Great Britain) and most of studies do not meet the minimum requirement of representativeness (three seasons, > 20 broods/season), which limits their external validity. The majority of investigations were done decades ago, in different conditions and most probably they cannot be treated as representative for the current situation. There is no study in which the past (before warming) and current nestling diet in the same local population have been compared, so, direct empirical support for the 'mismatch' idea is rather weak. Knowledge of nestling diet and its variation is far from adequate and new, properly designed, studies are needed.

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Wykorzystanie budek lęgowych na siedliskach borowych w Puszczy Augustowskiej

63%

Zawadzki G., Zawadzki J., Zawadzka D., Soltys A.

Leśne Prace Badawcze

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2019

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tom 80

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nr 2

Ograniczanie wyników

2 Acta Ornithologica

1 Leśne Prace Badawcze

1 Atienzar F.

1 Barba E.

1 Belda E. J.

1 Cholewa M.

1 Holleman L. J. M.

1 Soltys A.

1 Wesolowski T.

1 Zawadzka D.

1 Zawadzki G.

1 Zawadzki J.

1 2019

1 2011

1 2009

Nesting habitat requirements and nestling diet in the Mediterranean populations of Crested Tits Lophophanes cristatus

Nestling food of European hole-nesting passerines: do we know enough to test the adaptive hypotheses on breeding seasons?

Wykorzystanie budek lęgowych na siedliskach borowych w Puszczy Augustowskiej