Wyniki wyszukiwania

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Low incidence of polygyny revealed in a long term study of the Sedge Warbler Acrocephalus schoenobaenus in natural wetlands of the S Poland

100%

Zajac T., Solarz W.

Acta Ornithologica

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2004

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tom 39

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nr 1

In 1996-2002, 227 breeding attempts were studied in a colour-ringed Sedge Warbler population. Although 11% of males in this population resumed singing in order to mate with another female after their first females had laid eggs, only two polygynous males (i.e. 0.6%) were recorded. This is a very low value in comparison to other studies (ca. 7% on average). The low level of polygyny is attributable to the low food abundance in a natural floodplain, as the nestlings in this population were fed on predominantly small food items. Both polygynous males were recorded in 2002; this year was unusual, because flooding in early June (around the hatching date) destroyed most of the broods. This could have led to an influx of new females into the study area, a change in the operational sex ratio, and new mating opportunities for males.

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Polygamic system of the Great white pelican (Pelecanus onocrotalus L.) in the Poznan Zoological Garden

100%

Cwiertnia P., Bereszynski A.

Animal Science. Scientific Papers of Agricultural University of Poznan

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2003

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tom 05

3

Do permanently mixed colonies of wood ants (Hymenoptera: Formicidae) really exist?

80%

Czechowski W., Radchenko A.

Annales Zoologici

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2006

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tom 56

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nr 4

We describe the composition of two colonies of wood ants (FM-1 and FM-2) from southern Finland, identified on the basis of morphological investigations of workers (for FM-1, also of alate gynes and males) as mixed colonies comprising individuals with phenotypes typical of Formica aquilonia Yarr., F. polyctena Först, and F. rufa L. The prevailing species (phenotypes) were F. polyctena in FM-1, and F. rufa in FM-2. Colony FM-1 was observed every year in the period 1996-2006, almost from the moment it was formed. A first tentative investigation in 1999 revealed that it was already a mixed one and was probably also polygynous. Systematic follow-up investigations from 2002 to 2006 demonstrated relative stability of the proportions of individual species (phenotypes). A possible origin of this permanently mixed colony is postulated and discussed.

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Polyterritoriality and the first record of polygyny in the Red-breasted Flycatcher Ficedula parva in primeval forest

80%

Mitrus C., Socko B.

Acta Ornithologica

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2005

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tom 40

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nr 2

170-172

Territoriality in Red-breasted Flycatchers was studied in the Białowieża Forest of Eastern Poland during five consecutive breeding seasons (2000-2004). In total 99 males were individually marked, and evidence of polyterritoriality was found in 10% of them. The proportion of polyterritorial males varied from 0% (in 2003) to 13.6% (in 2001). The mean distance between the first and second territories was 278 m (± 179.37, n = 10). The rate of polyterritoriality was not related to age class, as older males defended dual territories that were, on average, not more distantly separated than those of younger males. One case of polygyny was recorded. To our knowledge, this is the first evidence for polyteritoriality and polygyny in male Red-breasted Flycatchers.

Ograniczanie wyników

2 Acta Ornithologica

1 Animal Science. Scientific Papers of Agricultural University of Poznan

1 Annales Zoologici

1 Bereszynski A.

1 Cwiertnia P.

1 Czechowski W.

1 Mitrus C.

1 Radchenko A.

1 Socko B.

1 Solarz W.

1 Zajac T.

1 2006

1 2005

1 2004

1 2003

Low incidence of polygyny revealed in a long term study of the Sedge Warbler Acrocephalus schoenobaenus in natural wetlands of the S Poland

Polygamic system of the Great white pelican (Pelecanus onocrotalus L.) in the Poznan Zoological Garden

Do permanently mixed colonies of wood ants (Hymenoptera: Formicidae) really exist?

Polyterritoriality and the first record of polygyny in the Red-breasted Flycatcher Ficedula parva in primeval forest