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1
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Assessment of reproductive parameters of privately bred zebra finch (Taeniopygia guttata)

100%
Ostrowski D., Banaszewska D., Biesiada-Drzazga B.
Acta Scientiarum Polonorum. Zootechnica
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2019
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tom 18
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nr 1
2

Influence of habitat urbanisation on time of breeding and productivity of Tawny Owl (Strix aluco)

72%
Gryz J., Krauze-Gryz D.
Polish Journal of Ecology
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2018
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tom 66
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nr 2
An increasing urbanization of habitats in which birds live influences their populations by modifying behaviour, dietary composition, causes of mortality and variables related to breeding. This study aimed to compare breeding periods and productivity among tawny owls, Strix aluco, inhabiting either an urban or an extra-urban area. Studies were conducted in parallel in two locations: central zone of Warsaw – the Polish capital – and the Rogów Forest – ca 70 km west of Warsaw. Number of fledglings and the beginning of the breeding period was assessed by direct observations and listening to calls of juveniles within tawny owl territories. Birds in the urban area were found to start breeding significantly earlier (from 5th February) than those in the extra-urban area (from 17th March). However, the two populations proved to be similarly productive, with 3.2 or 3.4 young per nest on average. The phenomenon of early breeding in city dwelling birds was confirmed in other tawny owl populations as well as other bird species. It can be potentially driven by factors such as higher temperature, artificial light and rich and stable food base.
3
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Content available

Reproductive cycle and the related spatial and temporal distribution of the ninespine stickleback (Pungitius pungitius L.) in Puck Bay

72%
Sokolowska E., Skora K. E.
Oceanologia
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2002
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tom 44
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nr 4
The cycle of gonad development and related changes in the length structure and spatial-temporal distribution of ninespine sticklebacks (Pungitius pungitius L.) in Puck Bay were studied. Observations were carried out in the shallow shore zones, as well as in the deeper epipelagic zone of the Bay. Ninespine sticklebacks reproduce in the brackish environment of Puck Bay, breeding in its warmer, inshore zones. Reproduction takes place in the spring and summer months, from April to July. One female spawns several clutches of eggs during one breeding season. The average length of ninespine sticklebacks in Puck Bay was about 40 mm, and the sex ratio in the population was close to 1:1. However, both length structure and sex ratio were subject to local and periodic variations, resulting from possible breeding-related territorial divisions. Higher gonadosomatic indices in females in early spring represented the transition of fish to the advanced vitelligenous phase. The lowest GSI of males during the breeding season indicated the termination of spermatogenesis. The completion of spawning in August started a new process of gonad restoration to prepare the fish for the next breeding season.
4

Studies on restricted feeding of carnivorous fur animals

72%
Zon A., Niedzwiadek S., Bielanski P., Zajac J.
Zeszyty Naukowe. Przegląd Hodowlany
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1996
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tom 28
5

Life history of Synurella ambulans [F.Muller, 1846] [Amphipoda, Crangonyctidae] from Central Poland

72%
Konopacka A., Blazewicz-Paszkowycz M.
Polskie Archiwum Hydrobiologii
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2000
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tom 47
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nr 3-4
6

Habitat preferences of foraging Rooks Corvus frugilegus during the breeding period in the agricultural landscape of Eastern Poland

72%
Kasprzykowski Z.
Acta Ornithologica
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2003
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tom 38
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nr 1
7

Reproductive characteristics of free-living Calomys venustus [Rodentia, Muridae]

72%
Polop J. J., Provensal M. C., Dauria P.
Acta Theriologica
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2005
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tom 50
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nr 3
Calomys venustus showed a cyclic seasonal pattern of reproductive activity characterized by a period of repose and a variable length of the period of sexual activity between August—September to May—June. The study was done from 1983 to 1999. During this time the population density increased from October—November to the end of autumn and sharply decreased in winter. Three peaks in rate of pregnancy were recognized in the breeding period: spring, summer and late summer. The average litter size was different among the three peaks in rate of pregnancy. The reproductive pattern had a peak at the beginning of the spring produced by overwintering animals, and another peak in summer-autumn caused by the reproductive activity of young born in the same period in which they breed. The spring cohort exhibited the greatest breeding contribution suggesting that this cohort is principally responsible for the yearly peak in abundance.
8

Nestbox use and reproductive parameters of Tree Sparrows Passer montanus: are they affected by the presence of old nests?

58%
Garcia-Navas V., Arroyo L., Sanz J. J.
Acta Ornithologica
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2008
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tom 43
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nr 1
32-42
There is a controversy over the effects of old nest reuse on the breeding biology of hole nesters. Some authors have shown that the presence of old nest material could increase ectoparasite pressure and/or reduce cavity size, whereas others argue that it could facilitate nest-building and serve as an informative cue for breeding birds. However, the possible functions of old nests may not be limited to the reproductive period in burds that perform autumnal courtship or use nest cavities as shelters during the winter season, as is the case with the Tree Sparrow. The importance of the presence of old nest material on nest box choice during the non-breeding period and its implications on the subsequent breeding performance of this multi-brood species are assessed. Occupancy rates and reproductive parameters (such as phenology, clutch size, nestling condition, breeding success) were compared between woodcrete and wooden nest boxes with and without old nest material inside. During the non-breeding period no effect of box type or its content on nest box selection was discovered, but in spring it was found that the strong preference of birds for breeding in woodcrete nest boxes was independent of the presence of old nests. In relation to this latter point, evidence was found that old nest reuse could negatively affect the reproductive output of Tree Sparrows: clutches were laid later, nestlings had longer wings (which presumably fledged earlier) and reproductive success was lower in nest boxes containing old nest material. The results of this study suggest that, taking the non-breeding and breeding seasons as a whole, the accumulation of old nest material seems to be detrimental rather than advantageous to this species.
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