Rola wskaźnikowa wszystkożernej grupy nicieni glebowych

Wasilewska, Lucyna

doi:ISSN 0013-2969

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Tytuł: Rola wskaźnikowa wszystkożernej grupy nicieni glebowych

Abstrakt:

The following trophic groups can be distinguished among soil nematodes:bacteriophages, mycophages, parasites of higher plants, omnivores and predators.Representatives of all the above groups can be found in all habitats, although thequantitative relations between them differ. The group of omnivores proved to besusceptible to cultivation operations. The author includes in this group representativesof the superfamily Dorylaimoidea (De Man 1876) Thorne 1934, with theexception of the genera Longidorus, Xiphinema and Trichodorus. The numbers ofdorylaimids were greatest in grassland, lower in forests and lowest in cultivatedfields. The author’s own studies show that natural habitats contain greater numbersof this group than is the case with cultivated fields (Tab. I), and also that thehighest percentage in relation to the whole nematode community is formed by theomnivorous group in meadows and pastures, fewer in a forest habitat and by farthe least in cultivated fields (Fig. 1). It may be concluded from comparison of theannual metabolism of this trophic group in several habitats that its significanc e issmall in cultivated fields and far greater in a more natural habitat (Fig. 2). Theauthor also found that the numbers of the omnivorous group were inversel y correlatedwith intensity of fertilization by sheep manure (Fig. 3). It can be assumed that the cause of the reduction in the group of omnivores in cultivated fields incontrary to natural habitats, lies in the cultivatio n operations carried out there.

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