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The Ecology of Nematodes in Manitoba Soils

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For more content, see Nematology.

Fifty-one genera of nematodes were found in three types of soil in southern Manitoba. Butlerius spp., Leptonchus spp., and Pseudhalenchus spp. were newly recorded in Canada. Helicotylenchus spp., Tylenchorhynchus spp. Tylenchus spp., Mesorhabditis spp., Panagrolaimus spp., and Eudorylaimus spp. were most numerous. Clay soils harbored more nematodes than sand. Differences in numbers of nematodes between three selected areas were correlated with differences of nitrogen (N), potassium (K) and soluble salts in the soil solution, and not with soil type. In pot experiments, nematode populations at the same initial density in clay and sand under grass were exposed to different levels of N, phosphorus (P) and K. After approximately 12 weeks, numbers of nematodes were greater in clay than in sand, but the difference may have been due to greater plant growth in clay. Nematode numbers decreased as N content in clay increased, whereas numbers increased with addition of N to sand. Numbers of dorylaimids were similar in clay and sand. Tylenchids were more numerous in clay than in sand, and decreased as N concentrations were increased in clay. In sand, tylenchids increased in number with higher N levels. Numbers of non-stylet bearing (NSB) nematodes were similar in clay and sand. Increased N levels produced no change in NSB populations in clay, but were correlated with larger populations in sand. Nematode biomass was greater in clay than in sand, and decreased steadily in both soils as N increased.

Affiliations: 1: Department of Zoology, University of Manitoba, Winnipeg, Canada


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