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Effect of density on individual size and fertility in two species of weeds: Galinsoga ciliata Blake and Galinsoga parviflora Cav.

100%

Fu Dostatny D.

Polish Journal of Ecology

1999

tom 47

nr 3

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Variability of the reproductive system of Piscicola respirans [Troschel, 1850] [Hirudinea, Piscicolidae]

84%

Bielecki A., Jarosz A., Daczewska M., Saczko J.

Wiadomości Parazytologiczne

2000

tom 46

nr 2

The studies on the reproductive system of P. respirans, based on 115 specimens, have revealed its considerable variability. Two main types of the system can be distinguished: 1) ovaries reaching the first pair of testes, ejaculatory ducts symmetrical, no seminal vesicles (juvenile individuals), 2) ovaries reaching the first pair of testes, ejaculatory ducts symmetrical, seminal vesicles reaching the ends of ovaries (adults individuals). The structure of the reproductive system is correlated with the individual size and age. Because the reproductive system of P. respirans as described by BRUMPT (1900) and SKET ( 1968) based on type specimens designated by them, is found only in a small fraction (c. 4-8%) of specimens, a redescription of the species is necessary, best based on a neotype series.

Impact of young shelterbelts on organic matter content and development of microbial and faunal communities of adjacent fields

67%

Karg J., Kajak A., Ryszkowski L.

Polish Journal of Ecology

2003

tom 51

nr 3

The paper summarizes results of investigations done in 1999-2000 by 'several authors in Wielkopolska region, (western Poland) near Turew in young midfield shelterbelts and adjacent cereal felds. It was found that the soil organic matter content, as well as microbial and faunal biomass decrease gradually from the shelterbelt toward the field centre. The annual increase of carbon was assessed and possible sources of it (wind erosion, leaf fall, input of invertebrate faeces) considered. The results suggest, that excreta contribute significantly to total carbon input. The shelterbelts influence the biomass, density and composition of many soil and above-ground invertebrate taxa and individual size of animals occurring in bordering fields.

Ograniczanie wyników

2 Polish Journal of Ecology

1 Wiadomości Parazytologiczne

1 Bielecki A.

1 Daczewska M.

1 Fu Dostatny D.

1 Jarosz A.

1 Kajak A.

1 Karg J.

1 Ryszkowski L.

1 Saczko J.

1 2003

1 2000

1 1999

Wyniki wyszukiwania

Effect of density on individual size and fertility in two species of weeds: Galinsoga ciliata Blake and Galinsoga parviflora Cav.

Variability of the reproductive system of Piscicola respirans [Troschel, 1850] [Hirudinea, Piscicolidae]

Impact of young shelterbelts on organic matter content and development of microbial and faunal communities of adjacent fields