Wyniki wyszukiwania

1

Hyperparasitoids of aphids on maize in Opole region in Poland

100%

Krawczyk A., Hurej M., Jackowski J.

Polish Journal of Entomology

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2009

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tom 78

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nr 2

The studies were carried out on the maize crops grown in monoculture in 2004-2005 on two experimental fields at Łosiów and Wronów in Opole region, Poland. From the aphid mummies collected at both sites secondary parasitoids of the families Pteromalidae, Cynipidae, Megaspilidae, and Encyrtidae were reared. In spring and early summer of 2004, the most abundant were the species of Pteromalidae, with the eudominating species Asaphes suspensus NEES. At the same time of the next year the dominant species were Dendrocerus carpenteri (CURTIS) (Megaspilidae) and Phaenoglyphis villosa (HARTIG) (Charipidae: Alloxistinae). In autumn, the secondary parasitoids occurred only in the second year of the study, 2005. The dominant species at both sites was Phaenoglyphis xanthochroa (FÖRSTER) (Charipidae: Alloxistinae). In the literature available so far there are no data on secondary parasitoids incidence on maize crop in autumn.

2

Body size and the relative abundance of species

84%

Ulrich W.

Ecological Questions

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2008

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tom 10

Existing models of species abundance distributions (SADs) can be divided into those that are based on concepts of common limited niche space (niche apportionment models, neutral models) and those that invoke standard statistical distributions (e. g. log-series, lognormal). While the first type of models assumes that competitive interactions lead to observed SADs, the models of the second type appear to be mainly statistical descriptors of SADs without deeper biological meaning. None of the models explicitly includes species body size as a factor influencing species abundances. Further, with the exception of recent neutral models they are not embedded into basic ecological and evolutionary models to explain local diversity and ecosystem functioning. Here I present a new random walk model of species abundances that is based on two well known ecological distributions, the abundance - body weight distribution and the species - body weight distribution to define long-term upper abundance boundaries (carrying capacities). I show that a simple random walk of species abundances around the carrying capacities not only generates observed SADs but is also able to explain other patterns of community structure like core - satellite distributions, temporal patterns of species turnover, variance - mean ratios, and biomass distributions.

3

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Thrips (Thysanoptera) occurring in ears of Triticum durum Desf. in conditions of different protection level

67%

Hurej M., Twardowski J., Chrzanowska-Drozdz B.

Acta Scientiarum Polonorum. Agricultura

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2010

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tom 09

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nr 1

The objective of this study was to determine the abundance and species composition of thrips collected from ears of Triticum durum Desf. in relation to plant protection intensity. The experiment was set up at the Experimental Research Station of Wrocław University of Environmental and Life Sciences, at Pawłowice (51°09’ N; 17°06’ E), Poland, in 2006-2008. It was conducted on durum wheat plants at three different levels of plant protection intensity and on common winter wheat plants. The samples of thrips were collected from the ears of the plants at the milk maturity stage of the grain. During three years of the research, eight species of thrips were identified from Triticum durum. Most often the eudominants were Haplothrips aculeatus, Limothrips cerealium and L. denticornis. We have demonstrated that there was no statistically significant effect of the plant protection intensity on the thrips abundance. The host species, on the other hand, did not affect the species composition of the studied insects.

4

Similarity between seed bank and herb layer in a natural deciduous temperate lowland forest

67%

Wodkiewicz M., Kwiatkowska-Falinska A. J.

Acta Societatis Botanicorum Poloniae

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2010

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tom 79

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nr 2

157-166

Forest seed banks mostly studied in managed forests proved to be small, species poor and not reflecting aboveground species composition. Yet studies conducted in undisturbed communities indicate a different seed bank characteristic. Therefore we aimed at describing soil seed bank in an undisturbed forest in a remnant of European lowland temperate forests, the Białowieża Forest. We compared similarity between the herb layer and seed bank, similarity of seed bank between different patches, and dominance structure of species in the herb layer and in the seed bank of two related oak-hornbeam communities. We report relatively high values of Sorensen species similarity index between herb layer and seed bank of both patches. This suggests higher species similarity of the herb layer and soil seed bank in natural, unmanaged forests represented by both plots than in fragmented communities influenced by man. Although there was a set of core seed bank species present at both plots, yielding high Sorensen species similarity index values, considerable differences between plots in seed bank size and dominance structure of species were found, indicating spatial variability of studied seed bank generated by edaphic conditions. Dominance structure of species in the herb layer was not reflected in the underlying seed bank. This stresses, that natural forest regeneration cannot rely only on the seed bank, although some forest species are capable of forming soil seed banks. While forest seed banks may not reflect vegetation composition of past successional stages, they may inform on history and land use of a specific plot.

5

Dominacja gatunkow i bioroznorodnosc zbiorowisk agrocenoz ziemniaka doliny Srodkowej Wisly

59%

Skrzyczynska J., Lugowska M.

Zeszyty Problemowe Postępów Nauk Rolniczych

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2008

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tom 530

105-115

Badania składu i struktury agrofitocenoz ziemniaka przeprowadzono w latach 2003-2006 na obszarze Doliny Środkowej Wisły metodą fitosocjologiczną Braun- Blanqueta. Obserwacje wykonano na 143 plantacjach rozmieszczonych w różnych warunkach siedliskowych. Warunki siedliskowe określono wykorzystując mapy glebowo-rolnicze w skali 1 : 5 000 oraz oznaczono pH gleby metodą kolorymetryczną. Ekologiczne wskaźniki dominacji i bioróżnorodności policzono według wzoru Shannona (H’) i Simpsona (SI). Celem przeprowadzonych badań było określenie gatunków dominujących na różnych siedliskach oraz przedstawienie różnorodności florystycznej zbiorowisk zachwaszczających plantacje ziemniaka w oparciu o wskaźniki ekologiczne. W uprawach ziemniaka odnotowano ogółem 202 gatunki chwastów, w tym 126 krótkotrwałych i 76 wieloletnich. Najuboższą florą charakteryzowały się uprawy na glebach kompleksu żytniego bardzo słabego i słabego. Obliczone wskaźniki dominacji gatunków w tych fitocenozach były wysokie, co wynikało z małej bioróżnorodności zbiorowisk oraz udziału gatunków w wysokim stopniu zachwaszczenia. Natomiast najbogatsze fitocenozy wystąpiły na siedliskach żyznych i charakteryzowały się wysokim indeksem bioróżnorodności oraz wysoką średnią liczbą gatunków chwastów.

6

Ecological and phytosociological aspects of the occurrence of phytocoenoses with a dominant Galega officinalis L. in the area of Katowice town [The Silesian Upland]

59%

Blonska A., Brzeg A., Wika S.

Badania Fizjograficzne nad Polską Zachodnią. Seria B

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2007

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tom 56

55-69

7

Benthic and epiphytic fauna of Gastrotricha in littoral of mesotrophic lake in Leczna-Wlodawa Lakeland, Poland

51%

Nesteruk T.

Fragmenta Faunistica

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2004

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tom 47

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nr 1

Ograniczanie wyników

1 Acta Scientiarum Polonorum. Agricultura

1 Acta Societatis Botanicorum Poloniae

1 Badania Fizjograficzne nad Polską Zachodnią. Seria B

1 Ecological Questions

1 Fragmenta Faunistica

1 Polish Journal of Entomology

1 Zeszyty Problemowe Postępów Nauk Rolniczych

2 Hurej M.

1 Blonska A.

1 Brzeg A.

1 Chrzanowska-Drozdz B.

1 Jackowski J.

1 Krawczyk A.

1 Kwiatkowska-Falinska A. J.

1 Lugowska M.

1 Nesteruk T.

1 Skrzyczynska J.

1 Twardowski J.

1 Ulrich W.

1 Wika S.

1 Wodkiewicz M.

2 2010

1 2009

2 2008

1 2007