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4
Content available Jaki to ptak? 80: Skowronek Alauda arvensis
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EN
The breeding populations of the Skylark Alauda arvensis, Yellowhammer Emberiza citrinella, Corn Bunting Miliaria calandra, Yellow Wagtail Motacilla flava, Whinchat Saxicola rubetra, and Red-backed Shrike Lanius collurio were censused by the mapping method on 315 ha of intensive farmland in W Poland. Results obtained in 2006 and 2007 were compared with previously published data from 1987 to 1997. Changes in habitat structure, mainly the decline of margin habitats, and the intensification of agricultural production, which both occurred between the two study periods, affected breeding bird populations; M. flava showed drastic long-term decreasing trends, and M. calandra increased significantly in number. The other four species showed yearto-year variation rather than directional trends. Numbers of A. arvensis declined from 1987 to the late 1990s and subsequently increased. Generally, population trends of the studied species were similar to those in other long-term study plots in Poland but differed from trends in Western Europe.
EN
We describe and discuss species of Plasmodium with four nuclei arranged in doublets or forming a maltese cross and loose, residual cytoplasm, described from Passer hispaniolensis in Algeria. The following species are described: Plasmodium rouxi from Alauda arvensis, from France Plasmodium mohammedi sp. nov. from Passer domesticus biblicus and Plasmodium pachysomum sp. nov. from Anthus campestris, from Israel, Plasmodium pfefferi sp. nov. from Pica pica and Plasmodium sergentorum sp. nov. from Alauda arvensis and Pica pica from France and Plasmodium stellatum sp. nov. from Muscicapa striata from Israel. All species vary in the spatial position of their four nuclei and the presence or absence of refractile, blue-staining globules. All of the described species differ from P. vaughani Novy et Mac Neal, 1904 and its siblings (example: P. vaughani merulae Corradetti et Scanga, 1973) in their number of merozoites (always four versus four to eight in the latter) and their spatial arrangement in the schizont.
11
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EN
Two study areas, 210 ha (A) and 120 ha (B), have been selected. Arable grounds dominated (92%) in the study area A, while meadows (63% in 1989 and 47% in 2003) - in the study area B. The changes in land use in both study areas have occurred in 2003 comparatively with 1989. In the study area A, an increase of the area with maize (from 1.1 ha to 38.4 ha) and oat (from 5.6 to 28.4 ha), and decrease in area of the rape (from 41.3 to 0.3 ha) and root plants (from 16.7 to 6.4 ha) have been recorded, while the clover and broad bean have totally disappeared as cultivated plants. In the study area B, a conversion of some dry meadows into arable grounds and an abandonment of more than half of the remaining area of meadows has been carried out. The landscape in the study area A was more fragmented in 1989 than in 2003, while in the study area B the reverse was true. On average, cereal areas increased - especially wheat (from 1.5 to 2.4 ha), maize (from 0.6 to 3.8 ha) and oat (from 0.6 to 1.9 ha), while rape areas decreased (from 2.0 to 0.3 ha). The mapping method has been employed to show the effect of these changes on breeding bird community in both years (1989 vs. 2003). In the study area A, density (pairs x 100[^-1] ha) of the Skylark Alauda arvensis (28.1 vs. 17.1) and Marsh Warbler Acrocephalus palustris (12.9 vs. 2.4) has significantly decreased; while that of Corn Bunting Miliaria calandra (1.4 vs. 8.1) and gallinaceous birds (2.9 vs. 8.1) has significantly increased over the last 14 years. The most numerous species in the group of gallinaceous birds, the Common Quail Coturnix coturnix, probably benefits from the enlargement of oat and barley cultivations. The Skylark was negatively affected by the enlargement of study areas with cultivated plants, especially with the wheat and maize. The Corn Bunting has been, probably, positively affected by the enlargement of maize and barley cultivations, as well as from the warming effect. The decline of the Marsh Warbler could have been caused by the decrease of the area with rape cultivations but it may also reflect short-term fluctuations. In the study area B, only densities of the Chaffinch Fringilla coelebs and Blackbird Turdus merula have significantly increased, and no statistically significant declines were recorded. These increases can be linked to changes in the age structure of tree and shrub stands in the existing small forests, clumps and hedgerows, but these species show probably a general increase in numbers over large areas of farmlands in Poland and possibly in some other European countries.
EN
Species richness and density of bird communities on intensively cultivated acres in relation to habitat characteristics were studied on the basis of counts in 15 fields (5-69 ha) situated on Dravsko Polje (46°25’N, 15°45'E), North-eastern Slovenia. There were three groups of fields: those covered with wheat, sugar-beet and maize. On average, ten bird species bred on intensive cultivated areas. Six of these occurred in all three field groups. The density of bird population ranged from 0 to 11.6 pairs/10 ha, averaging 2.93 pairs/10 ha. Only two species (Alauda arvensis and Saxicola torquata) were amongst the dominants in all three kinds of fields. The highest densities were on wheat fields but the differences among field categories were not significant (Kruskal-Wallis test). The number of species and bird population density did not dependent on the area of a particular field or nor relative edge length.
PL
Łącznie w Dravsko Polje (północno-wschodnia Słowenia) zbadano awifaunę lęgową 15 intensywnie użytkowanych pól uprawnych (agrocenoz) o powierzchni od 5 do 69 ha. Na terenach tych stosowano w bardzo dużych dawkach sztuczne nawożenie i pestycydy. Na siedmiu powierzchniach (łącznie 145 ha) uprawiano pszenicę, na czterech (87,4 ha) kukurydzę i na czterech (71,5 ha) buraki cukrowe. Badane tereny były reprezentatywne dla agrocenoz omawianego regionu (tab. 1). Zastosowano metodę kartograficzną liczeń według Bibby et al. (1992). Każde pole było kontrolowane czterokrotnie — od połowy kwietnia do połowy czerwca w 1997r. Na jednym polu nie stwierdzono gniazdowania ptaków. Na pozostałych 14 wykryto łącznie 10 gatunków lęgowych. Zagęszczenia par lęgowych wynosiły od 0 do 11,6 par/10 ha, średnio 2,93 pary/10 ha. Zagęszczenie to było niskie w porównaniu z analogicznymi danymi, znanymi z agrocenoz środkowej Europy (np. Jermaczek & Tryjanowski 1990, Kujawa 1994). Przy porównaniu tym należy jednak pamiętać, że wymienieni autorzy uwzględniali w swoich wynikach także ptaki, które nie gniazdowały na polach (np. gatunki gniazdujące w żywopłotach). Sześć gatunków (przepiórka, skowronek, pliszka żółta, kląskawka, łozówka i cierniówka) występowało we wszystkich trzech rodzajach upraw. Wśród nich tylko skowronek i kląskawka należały do dominantów (> 5% udziału) we wszystkich typach upraw (tab. 2). Zagęszczenie par lęgowych było najwyższe w uprawach pszenicy, jednakże różnice pomiędzy uprawami nie były istotne statystycznie (Kruskal-Wallis test = 1,37, df = 2, p > 0,05). Zagęszczenia par były także najwyższe na polach bez rowów melioracyjnych, różnice także nie były istotne statystycznie (Mann-Whitney U test = 18,0, p > 0,5). Najwyższą różnorodność gatunkową stwierdzono w uprawach kukurydzy, różnice między rodzajami upraw również nie były istotne statystycznie — Kruskal-Wallis test = 2,36, df = 2, p > 0,05. Różnorodność gatunkowa nie różniła się także statystycznie na terenach otoczonych rowami i na terenach bez tych rowów (Mann-Whitney U test = 11,5, p > 0,05). Według wskaźnika Soerensena (Tomiałojć et al. 1984), wysokie podobieństwa składów gatunkowych stwierdzono w porównaniach upraw pszenicy i buraków cukrowych oraz buraków cukrowych i kukurydzy. Pojemność niszy (Hurlbert 1978) gniazdujących gatunków na badanych powierzchniach wynosiła od 0 do 0,94. Najszerszą niszę miał skworonek (tab. 3).
EN
Two study areas, 210 ha (A) and 120 ha (B), have been selected. Arable grounds dominated (92%) in the study area A, while meadows (63% in 1989 and 47% in 2003) – in the study area B. The changes in land use in both study areas have occurred in 2003 comparatively with 1989. In the study area A, an increase of the area with maize (from 1.1 ha to 38.4 ha) and oat (from 5.6 to 28.4 ha), and decrease in area of the rape (from 41.3 to 0.3 ha) and root plants (from 16.7 to 6.4 ha) have been recorded, while the clover and broad bean have totally disappeared as cultivated plants. In the study area B, a conversion of some dry meadows into arable grounds and an abandonment of more than half of the remaining area of meadows has been carried out. The landscape in the study area A was more fragmented in 1989 than in 2003, while in the study area B the reverse was true. On average, cereal areas increased – especially wheat (from 1.5 to 2.4 ha), maize (from 0.6 to 3.8 ha) and oat (from 0.6 to 1.9 ha), while rape areas decreased (from 2.0 to 0.3 ha). The mapping method has been employed to show the effect of these changes on breeding bird community in both years (1989 vs. 2003). In the study area A, density (pairs × 100⁻¹ ha) of the Skylark Alauda arvensis (28.1 vs. 17.1) and Marsh Warbler Acrocephalus palustris (12.9 vs. 2.4) has significantly decreased; while that of Corn Bunting Miliaria calandra (1.4 vs. 8.1) and gallinaceous birds (2.9 vs. 8.1) has significantly increased over the last 14 years. The most numerous species in the group of gallinaceous birds, the Common Quail Coturnix coturnix, probably benefits from the enlargement of oat and barley cultivations. The Skylark was negatively affected by the enlargement of study areas with cultivated plants, especially with the wheat and maize. The Corn Bunting has been, probably, positively affected by the enlargement of maize and barley cultivations, as well as from the warming effect. The decline of the Marsh Warbler could have been caused by the decrease of the area with rape cultivations but it may also reflect short-term fluctuations. In the study area B, only densities of the Chaffinch Fringilla coelebs and Blackbird Turdus merula have significantly increased, and no statistically significant declines were recorded. These increases can be linked to changes in the age structure of tree and shrub stands in the existing small forests, clumps and hedgerows, but these species show probably a general increase in numbers over large areas of farmlands in Poland and possibly in some other European countries.
EN
The breeding populations of the Skylark Alauda arvensis, Yellowhammer Emberiza citrinella, Corn Bunting Miliaria calandra, Yellow Wagtail Motacilla flava, Whinchat Saxicola rubetra, and Red-backed Shrike Lanius collurio were censused by the mapping method on 315 ha of intensive farmland in W Poland. Results obtained in 2006 and 2007 were compared with previously published data from 1987 to 1997. Changes in habitat structure, mainly the decline of margin habitats, and the intensification of agricultural production, which both occurred between the two study periods, affected breeding bird populations; M. flava showed drastic long-term decreasing trends, and M. calandra increased significantly in number. The other four species showed year-to-year variation rather than directional trends. Numbers of A. arvensis declined from 1987 to the late 1990s and subsequently increased. Generally, population trends of the studied species were similar to those in other long-term study plots in Poland but differed from trends in Western Europe.
16
Content available Ptasi teatr
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