Wyniki wyszukiwania

1

How do Common Gulls [Larus canus] pass through Copenhagen on migration?

100%

Pedersen K. T., Fritze E. B., Kharitonov S. P.

The Ring

|

1999

|

tom 21

|

nr 2

2

Site parameters’ variance – a missing dimension in the studies of nest-site selection?

84%

Skorka P., Martyka R., Wojcik J. D., Lenda M.

Polish Journal of Ecology

|

2011

|

tom 59

|

nr 2

In most studies of nest-site selection the data of habitat parameters are treated with analysis of variance. A basic assumption of this test is the homogeneity of variance. Here, we show that the nest-site selection process leads to lower variance of the selected parameters than in the case of random points which generally describe the available average characteristics of the environment. Thus, the variance should be accounted for in studies on nest-site selection and it should be treated not as a problem (as it is usually done), but as a source of additional important information on the selection process. Comparison only of mean values often does not lead to significant differences between nest site parameters and random points which may result from a small effect size (when animals select features similar to the general mean of available characteristics). Deeper insight into variance of the site parameters may elicit important results. We illustrate this issue with real data on nest site (islets and shores of water reservoirs) selection in the Common Gull Larus canus. Four (islet’s area, vegetation height on islets, vegetation cover on shore and distance to nearest shrub or tree on shore) from eight parameters were favored by the birds and, as predicted, their variance values were lower than of those not selected (vegetation cover on islets, distance of the islets to shoreline, vegetation height on shore and distance to water).

3

Habitat and nest site selection in the Common Gull Larus canus in southern Poland: significance of man-made habitats for conservation of an endangered species

67%

Skorka P., Martyka R., Wojcik J. D., Babiarz T., Skorka J.

Acta Ornithologica

|

2006

|

tom 41

|

nr 2

4

The species composition and the age structure of Gulls wintering in the selected places of the Gulf of Gdansk

67%

Meissner W., Nitecki C.

The Ring

|

1999

|

tom 21

|

nr 2

5

Dioksyny i furany [PCDD-Fs] w ptakach morskich z poludniowej czesci Morza Baltyckiego

43%

Falandysz J., Bergqvist P. A., Rappe C.

Bromatologia i Chemia Toksykologiczna

|

1998

|

tom 31

|

nr 1

75-78

Oznaczono stężenie polichlorowanych dibenzo-p-dioksyn (PCDDs) i polichlorowanych dibenzofuranów (PCDFs) w tkankach trzech grup ptaków morskich - wszystkożernych (mewa pospolita Larus canus), rybożernych (nur rdzawoszyi Gavia stellata, alka krzywonosa Alca torda, nurzyk podbielały Uria aalge) i drapieżnych (bielik Haliaeetus albicilla), z części południowej Morza Bałtyckiego. 2,3,4,7,8-penta-CDF i 1,2,3,7,8- penta-CDD wykryto w największym stężeniu, a w mniejszym wiele innych mniej toksycznych PCDDs i PCDFs.

Ograniczanie wyników

2 The Ring

1 Acta Ornithologica

1 Bromatologia i Chemia Toksykologiczna

1 Polish Journal of Ecology

2 Martyka R.

2 Skorka P.

2 Wojcik J. D.

1 Babiarz T.

1 Bergqvist P. A.

1 Falandysz J.

1 Fritze E. B.

1 Kharitonov S. P.

1 Lenda M.

1 Meissner W.

1 Nitecki C.

1 Pedersen K. T.

1 Rappe C.

1 Skorka J.

1 2011

1 2006

2 1999

1 1998

How do Common Gulls [Larus canus] pass through Copenhagen on migration?

Site parameters’ variance – a missing dimension in the studies of nest-site selection?

Habitat and nest site selection in the Common Gull Larus canus in southern Poland: significance of man-made habitats for conservation of an endangered species

The species composition and the age structure of Gulls wintering in the selected places of the Gulf of Gdansk

Dioksyny i furany [PCDD-Fs] w ptakach morskich z poludniowej czesci Morza Baltyckiego