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  1. 17 Acta Ornithologica

  2. 13 Przyroda Polska

  3. 11 Notatki Ornitologiczne

  4. 9 Łowiec Polski

  5. 5 Wszechświat

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  1. 4 Zawadzka D.

  2. 3 Gorski W.

  3. 3 Jadczyk P.

  4. 3 Kotlarz B.

  5. 3 Trost C. H.

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  1. 2 2019

  2. 1 2018

  3. 1 2017

  4. 3 2015

  5. 3 2014

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1

Krukowate

100%
Wedzinski A.
Zachodni Poradnik Łowiecki. Kwartalnik Wojewódzkiego Sejmiku Łowieckiego w Poznaniu
|
2009-2010
|
nr 3[31]
2

Zagrożenie ze stron krukowatych

100%
Kaluzinski J.
Zachodni Poradnik Łowiecki. Kwartalnik Wojewódzkiego Sejmiku Łowieckiego w Poznaniu
|
2008-2009
|
nr 1[25]
3

Reproductive success of Yellow-billed Magpies Pica nuttalli in central coastal California

86%
Reynolds M. D., Koenig W. D.
Acta Ornithologica
|
1997
|
tom 32
|
nr 1
99-109
Yellow-billed Magpies in central coastal California had significant variation in laying date of first egg and clutch size within and among years. The length of the breeding season was shorter than for other magpies, but timing of breeding varied widely among years. Early breeders laid larger clutches and, for successful nests, fledged more young than later breeders. Breeding coincided with peak food abundance and breeding early, relative to a particular year's food peak, resulted in higher reproductive success. However, variation in annual reproductive success was not correlated with precipitation or temperature. First-year and mixed-age pairs laid later and smaller clutches than older pairs. First-year females fledged fewer young than older females. Heavier females laid eggs earlier than lighter females. Number of breeding attempts was the most important determinant of reproductive success among years.
4

Indywidualne znakowanie wron amerykanskich [Corvus brachyrynchos] poprzez odbarwianie pior

86%
Romanowski J., Reed L., Caccamise D. F., Stouffer P.
Notatki Ornitologiczne
|
1993
|
tom 34
|
nr 1-2
157-161
5

Spadek liczebnosci srodpolnych ptakow krukowatych Corvidae w poludniowo-zachodniej Polsce

86%
Tomialojc L.
Chrońmy Przyrodę Ojczystą
|
2009
|
tom 65
|
nr 6
415-422
Po wzroście liczebności w połowie XX wieku potem w południowo-zachodniej Polsce polne ptaki krukowate Corvidae (w przeciwieństwie do miejskich) silnie zmniejszyły swoje populacje. W niniejszej pracy porównano nieliczne konkretne dawne dane ze stanem obecnym. Liczebność wrony siwej Corvus cornix na trzech dolnośląskich powierzchniach próbnych badanych w latach 1960. lub 1970. oraz ostatnio (2008–2009) zmniejszyła się ponad 30-krotnie, z 7–53 p do 0–2 par. Obserwacje z pociągu (wzdłuż ok. 1250 km tras) potwierdziły obecną niską jej liczebność na rozległym obszarze południowo- zachodniej Polski, jak również sugerują obecną niską liczebność gawronów C. frugilegus, kawek C. monedula i śródpolnych srok Pica pica. Przyczynami jest prawdopodobnie splot dwóch czynników: a) zastąpienie niskotrawiastych pastwisk oraz upraw buraka cukrowego i ziemniaków przez wysokotrawiaste łąki oraz wielkopowierzchniowe uprawy zbóż ozimych, rzepaku i kukurydzy; b) pojawienie się i wzrost liczebności kruka Corvus corax. Dwa rodzaje obserwacji oraz test wokalny sugerują, że zniknięcie z krajobrazu rolniczego bardzo widocznych gniazd wron i srok, może być spowodowane drapieżnictwem gniazdowym kruków
6

Smiertelnosc ptakow krukowatych Corvidae na noclegowisku zimowym w Siedlcach w sezonie 2000/2001

86%
Kasprzykowski Z.
Notatki Ornitologiczne
|
2002
|
tom 43
|
nr 1
52-53
7

Wrony siwe [Corvus corone cornix] rozbijaja orzechy zrzucajac je na ziemie

86%
Lorek G., Oleksik I.
Notatki Ornitologiczne
|
1992
|
tom 33
|
nr 3-4
331-332
8

Krukowate - piękne i mądre

86%
Tryjanowski P.
Animal Expert
|
2019
|
nr 5
9
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
Content available

Dwa lęgi pary kruka Corvus corax w jednym sezonie

72%
Stepniewski J., Luczak A.
Ornis Polonica
|
2015
|
tom 56
|
nr 4
10

Wing plumage variation and genetic, relatedness in the European Black-billed Magpie Pica pica

72%
Parrott D.
Acta Ornithologica
|
1997
|
tom 32
|
nr 1
87-92
Black-billed Magpies possess distinctive patterns of black and white on their flight feathers which have been suggested to be family-specific. Such a phenomenon could potentially provide a simple field-method for recognising related or unrelated offspring. Using a combination of wing plumage patterns and multilocus DNA fingerprinting the relationship between plumage variation and genetic relatedness in the European Black-billed Magpie was investigated. The plumage of nestmates was more similar to each other than to young in other nests. However, extra-pair offspring could not be identified from nestmates through plumage differences. Within brood similarity may be explained by full-siblings sharing plumage characteristics through random inheritance, or through a shared rearing environment. Extra-pair offspring may resemble their half-sibs due to shared maternal plumage characteristics and a common rearing environment.
11

Zmiany liczebności wybranych gatunków ptaków w okresie pozalęgowym w centralnej części Niziny Północnopodlaskiej w latach 2000–2011

72%
Jankowiak L., Polakowski M., Kulakowski T., Swietochowski P., Tumiel T., Broniszewska M.
Ornis Polonica
|
2013
|
tom 54
|
nr 2
12

Polska przyroda w opałach

72%
Wedzinski A.
Zachodni Poradnik Łowiecki. Kwartalnik Wojewódzkiego Sejmiku Łowieckiego w Poznaniu
|
2014-2015
|
nr 1[49]
13

On the abundance of the Magpie Pica pica during breeding and winter season in Berlin

72%
Witt K.
Acta Ornithologica
|
1997
|
tom 32
|
nr 1
121-126
Magpie Pica pica is widely distributed over the built-up areas of Berlin. A population increase is observed at least from the 60s up to now. Over about 20 years population changes are documented in different parts of Berlin. Some main lines of increase are shown for two different habitat types: residential district and closed built-up zone of the city. The method of territory mapping was applied including search for nest stands. The population changes are different for both parts (less steep in the residential district). Recent abundances in the central block building districts exceed those from the residential districts, however, the new top number ist 32 p/km² for a high-rise building area. Since 1991, winter birds were censused in different habitats of Berlin since 1991, during the winter periods 1991 and 1992 with varying plot size, and from 1993 to 1995 on 5ha plots. Magpie uses the residential district with high frequency and abundance. There is some concern about comparability of abundances from winter and breeding seasons. The daily range of a roosting winter community of up to 420 birds is estimated at about 12 km², which means an abundance of up to 3,5 ind./10ha rather near to numbers found on 5ha plots, however, exceeding numbers expected from the breeding season. Henceforth, during winter time Magpies may prefer other habitat types than in the breeding season.
14

Zimowe zgrupowanie gawronow Corvus frugilegus w Europie

72%
Jadczyk P., Jakubiec Z.
Przegląd Zoologiczny
|
1995
|
tom 39
|
nr 3-4
297-312
15
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
Content available

Wpływ ptaków krukowatych na szatę roślinną i faunę glebową rezerwatu Las Bielański

72%
Maksym T., Slawska M.
Studia i Materiały Centrum Edukacji Przyrodniczo-Leśnej
|
2011
|
tom 13
|
nr 2[27]
16

The ecology of the Black-billed Magpie Pica pica sericea in Japan

72%
Eguchi K., Takeishi M.
Acta Ornithologica
|
1997
|
tom 32
|
nr 1
33-37
The Black-billed Magpie, Pica pica sericea, was introduced in Japan from Korea about 400 years ago. It inhabits a restricted area in northern Kyushu, but has relatively high nesting density in some areas (> 20 pairs per km²). Most nests are built in the vicinity of human habitation, even in the midst of cities. Most clutches are laid in March and April. Mean clutch size (6.2) and mean number of hatchlings (4.2) are within the ranges of values for European and North American races. Nesting success is low, with only 18% of clutches surviving to fledge. Predation, mainly by crows, is a major cause of failure, accounting for 81% of clutch loss and 84% of brood loss. Low nesting success may have taken place in recent years. Nests on utility poles are more successful than those in trees. Nesting on utility poles has been increasing, occupying more than 50% of total number of nests. The range of the Black-billed Magpie has been gradually expanding in Japan.
17

Extra-pair copulations in Yellow-billed Magpies Pica nuttalli: preliminary results

72%
Bolen G. M.
Acta Ornithologica
|
1997
|
tom 32
|
nr 1
9-13
The adaptive significance of female extra-pair copulation behavior was investigated in Yellow-billed Magpies, Pica nuttalli, a socially monogamous species. Research was carried out in central coastal California, U.S.A. Observations of female behavior towards extra-pair males during the breeding season suggest that females display a preference for certain extra-pair males. In addition, observations confirm that females can successfully resist male copulation attempts. However, based on a small sample, no significant difference in fledging success was found for nests at which extra-pair visits occurred and those at which they did not. Multilocus DNA fingerprinting analysis is in progress to determine the rate of extra-pair fertilizations. These data will be analyzed for correlations between female behavior towards extra-pair males and those males successfully gaining extra-pair fertilizations, and for differences in fledging success between nests with extra-pair fertilizations and those without extra-pair fertilizations.
18

Numbers and distribution of the Magpie Pica pica in Lvov [Ukraine]

72%
Bokotey A. A.
Acta Ornithologica
|
1997
|
tom 32
|
nr 1
5-7
Research on the Magpie Pica pica was conducted in the limits of urbanized part of Lvov (66.5km2) in the summer of 1994-1995, and the winters of 1993/94 and 1994/95. The work was based on an ecological (landscape mosaic) division of the city. The number of breeding Magpies was estimated to be 520 pairs (0.8 pair/10ha). The highest density of birds was recorded in parks and areas of one family houses (1.2 pair/10ha), less in the modem housing estates (0.7 pair/10ha), and the lowest in the central and industrial districts (0.4 pair/10ha). The number of wintering Magpies in Lvov is about 2000 (3 ind./10ha). The highest density was recorded in rural zones of the town (8.4 ind./10ha), the least in the industrial zones (1.8 ind./10ha). In winter outside of the town Magpies were counted at a communal roost, which gathered up to 1700 individuals.
19

Variation in the wing patches of juvenile Black-billed Magpie Pica pica

72%
Reed L. M., Wang X., Trost C. H.
Acta Ornithologica
|
1997
|
tom 32
|
nr 1
93-97
Variability in morphological features is one mechanism by which recognition of individuals or kin, crucial to many social interactions, can occur. Patches in the remiges of magpie wings (white patches with black tips) contain information regarding the bearer's age and sex. Juvenile wing patches of both Black-billed Pica pica hudsonia and Yellow-billed Magpies Pica nuttalli contain between 10 to 12 feathers with variable lengths of white. Our investigations examine the relationship between wing patch morphology and relatedness. We measured the black tips on the primaries of one wing on 29 fledglings from seven nests. We derived a discriminant function based on the length of black on three inner primaries that successfully assigned 75 % of the birds to their natal nests (random assignment = 14% correct). We also compared the total length of black tips in the wing patches of young from 33 nests. We found less variation in the patch size within than between nests (log transformed ANOVA F = 8.339, p < 0.001; Kruskal-Wallis H = 113.6, p < 0.001). These results suggest that familial resemblance is encoded in juvenal magpie wing patches. Family recognition may be important both to the parents, who provide protection and food for their young, as well as between siblings, who apparently know each other.
20

Liczebnosc populacji legowej gawrona Corvus frugilegus w Agroekologicznym Parku Krajobrazowym kolo Turwi w roku 1995

72%
Tryjanowski P.
Przegląd Przyrodniczy
|
1996
|
tom 07
|
nr 2
55-59
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