Dynamics of sympatric Paratylenchus nanus and Paratrichodorus minor populations in soil under pasture

Abstract Populations of both Paratrichodorus minor and Paratylenchus nanus in a grazed pasture in Waikato, New Zealand were assessed in single 2.5 cm diam. core samples over six successive seasons. Neither seasonal periodicity nor a consistent vertical distribution pattern was observed in the P.mino...

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Bibliographic Details
Published in:Nematology : international journal of fundamental and applied nematological research 2001, Vol.3 (3), p.267-275
Main Authors: Bell, Nigel L, Watson, Richard N
Format: Article
Language:English
Subjects:
ACTIVITY INDEX
Animal and plant ecology
Animal, plant and microbial ecology
Animals
Biological and medical sciences
COMPETITION
Demecology
Fundamental and applied biological sciences. Psychology
Nematoda
Paratrichodorus
Paratylenchus nanus
Protozoa. Invertebrata
RAINFALL
SEASONAL PERIODICITY
TEMPERATURE
VERTICAL DISTRIBUTION
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Summary:Abstract Populations of both Paratrichodorus minor and Paratylenchus nanus in a grazed pasture in Waikato, New Zealand were assessed in single 2.5 cm diam. core samples over six successive seasons. Neither seasonal periodicity nor a consistent vertical distribution pattern was observed in the P.minor population. P.nanus had distinct spring and summer population maxima and was more abundant at 0-10 than 10-20 cm depth. P.minor but not P.nanus abundance was significantly correlated with rainfall and an activity index combining rainfall and soil temperature for the week before sampling. Significant correlations among P.minor, P.nanus and concentrations of some soil nutrients seemed to reflect soil nutrient interactions with other biotic factors such as plant growth. There was no evidence for competition between these two nematodes. Host root resource, spatial aggregation and differences in morphology that indicate niche differences are discussed as possible reasons for the observed lack of competition.
ISSN:1388-5545
1568-5411
1388-5545
DOI:10.1163/156854101750413342