Wyniki wyszukiwania

1

Application of the photographic tree-crowns gains measure method in ecological researches

100%

Borowski J., Gospodarczyk A.

Annals of Warsaw Agricultural University. Horticulture (Landscape Architecture)

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2004

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tom 25

2

The issue of the evolution of ecological systems

84%

Lastowski K.

Seria Biologiczna. Uniwersytet im. Adama Mickiewicza w Poznaniu

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2005

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tom 72

3

Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik

Hydrologiczne i hydroekologiczne problemy Ukrainskiego Polesia

67%

Kowalczuk I., Chilczewski W.

Acta Agrophysica

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2002

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tom 68

73-88

4

Changes in species richness and community productivity during succession on the Loess Plateau (China)

67%

Wang K., Shao R., Shangguan Z.

Polish Journal of Ecology

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2010

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tom 58

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nr 3

We investigated changes in species richness, community biomass, and productivity during secondary forest succession in Ziwuling area of the Loess Plateau of China. Species richness(number of taxa) increased as the succession proceeds, and peaked at the climax forest community, but the richness growth gradually slowed down as the succession advanced. Community biomass rapidly increased from the herbaceous stage to the shrub stage and declined slightly in the climax forest stage. The maximum community biomass occurred in the pioneer forest stage. Community productivity followed an unimodal curve in the succession, and the maximum productivity occurred in the shrub community at the middle succession stage, and the communities maintained a low and stable productivity at the later succession stages. The herb and shrub species together determined community diversity during succession, while the tree species contributed less to diversity in the communities. The herb and shrub layers had a relatively low biomass, but contributed almost half of the productivity of the forest communities. The relationships between species richness, community biomass and productivity were unimodal during succession, but only the relationship between species richness and community biomass was significant.

5

The use of stable isotope analyses in freshwater ecology: current awareness

67%

Grey J.

Polish Journal of Ecology

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2006

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tom 54

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nr 4

Ecological research using stable isotopes has progressed rapidly during the last 20 years and although more studies are including the addition of isotopically labelled compounds at tracer levels, the overwhelming majority rely on measurements of natural abundance ratios. Access to isotope ratio mass spectrometry has increased, spurred on by awareness of the techniques and increasing demand, and consequently cost of sample analysis has dropped. Today stable isotopes of carbon (¹³C/¹²C), nitrogen (¹⁵N/¹⁴N), sulphur (³⁴S/³²S), oxygen (¹⁸O/¹⁶O), and hydrogen (²H/¹H) can be determined routinely. Perhaps one of the most appealing attributes of isotopic signatures is their potential use to find patterns and determine mechanisms across a range of scales from the molecular level through to characterising whole food webs, reconstructing palaeoenvironments, tracing nutrient fluxes between ecosystems and identifying subsidies, or migrations of organisms. Ecologists from every discipline who are unlikely to have been trained as isotope chemists have added stable isotope analysis (SIA) to their “toolbox”, but often increasing use leads to increasing abuse. The usefulness of SIA arises from predictable physical and enzymatic-based discrimination between biological and non-biological materials leading to different isotopic compositions. Without some ecological understanding of these, interpretation of isotope-derived data can often be flawed. Here, I explore how SIA recently has been used for research in aquatic ecology, reviewing how some of these techniques have allowed elucidation of key processes in aquatic systems such as the contribution of allochthony to lake food webs, and discuss the “state of the art”. Included are some thoughts on where our knowledge in aquatic ecology remains deficient and how continued development and future application of SIA and interdisciplinary methodologies may be applied.

6

Izotopy radioaktywne w badaniach ekologicznych

67%

I.V.

Wszechświat

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1957

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nr 04

7

The number and abundance of ichneumonidae (Hymenoptera, Apocrita) subfamilies occurring in apple orchards and on their edges

51%

Piekarska-Boniecka H., Zyprych-Walczak J., Rzanska-Wieczorek M., Dinh D. T., Siatkowski I.

Acta Scientiarum Polonorum. Hortorum Cultus

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2018

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tom 17

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nr 2

Plant communities which form orchard edges are a vital element of ecological infrastructure enriching these agrocenoses. The research was conducted in an orchard environment made up of apple orchards and their edges in the form of agricultural cultivations, tree clumps and a road lined with trees and shrubberies. The study aim was to determine the impact of the orchard edge plant diversity onto the number and abundance of Ichneumonidae subfamilies in the orchards. The study showed that orchard environments made up of an apple orchard and edge plants of various species create better living conditions for Ichneumonidae parasitoids than the environment of an orchard and neighbouring agricultural cultivations. The diversity of orchard edge plants positively influences the abundance of the Ichneumonidae subfamilies rather than the number of subfamilies in the orchard. In the orchard habitat the following dominant subfamilies were found: Campopleginae, Cryptinae, Orthocentrinae and Pimplinae. These entomophages may control the abundance of pests infesting orchards.

Ograniczanie wyników

2 Polish Journal of Ecology

1 Acta Agrophysica

1 Acta Scientiarum Polonorum. Hortorum Cultus

1 Annals of Warsaw Agricultural University. Horticulture (Landscape Architecture)

1 Seria Biologiczna. Uniwersytet im. Adama Mickiewicza w Poznaniu

1 Wszechświat

1 Borowski J.

1 Chilczewski W.

1 Dinh D. T.

1 Gospodarczyk A.

1 Grey J.

1 I.V.

1 Kowalczuk I.

1 Lastowski K.

1 Piekarska-Boniecka H.

1 Rzanska-Wieczorek M.

1 Shangguan Z.

1 Shao R.

1 Siatkowski I.

1 Wang K.

1 Zyprych-Walczak J.

1 2018

1 2010

1 2006

1 2005

1 2004

1 2002