Successional trends in the characteristics of soil nematode communities in cropped and fallow lands in Senegal (Sonkorong) |
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| Institution: | 1. Laboratoire de biopédologie, BP 1386 IRD Bel Air, Dakar (Senegal);2. UMR-CNRS 5558 -BGBP, Bâtiment 741, Université Claude Bernard-Lyon I, 43, bd du 11 novembre 1918, 69 622 Villeurbanne Cedex, France;3. Laboratory of Nematology, Wageningen University, PB 8123 NL, 6700ES Wageningen, The Netherlands;1. Department of Radiology and Nuclear Medicine, Radboud University Medical Center, Nijmegen, The Netherlands;2. Division of Genitourinary Radiology, Ghent University Hospital, Ghent, Belgium;3. Department of Radiology and Biomedical Imaging, Yale School of Medicine, New Haven, CT, USA;1. Unite Graduate School of Agriculture, Tokyo University of Agriculture & Technology, 3-21-1 Ami, Ibaraki 300-0393, Japan;2. National Institute for Agro-Environmental Sciences, 3-1-3 Kannondai, Tsukuba, 305-8604, Japan;3. College of Agriculture, Ibaraki University, 3-21-1 Ami, Ibaraki 300-0393, Japan;4. Soil Ecology Research Group, Yokohama National University, 79-7 Tokiwadai, Hodogaya, Yokohama 240-8501, Japan |
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| Abstract: | Soil nematode communities in the 0–15 cm soil layer are used as indicators for describing the processes of fallow succession in the semi-arid zone of West Africa (Senegal). Abundance of plant feeding nematodes, non-plant feeding nematodes, plant parasite index (PPI), species richness and Shannon evenness of plant parasitic nematodes were measured at five stages of succession: fields, early (1–3 years), intermediate (8–10 years), old (18–20 years) fallows, and forest stage. These nematological indexes were analyzed simultaneously by multivariate analysis to show the indicative properties of nematode communities. Overall, changes in abundance of nematode groups, PPI and diversity, show continuous trends from early fallow to mature stages of the succession; these trends parallel theoretical trends in secondary succession. In addition, soil nematode parameters were meaningful and expressed interactions of various uncontrolled factors with successional processes, such as environmental conditions or cropping history. During the 3 years of the survey, the structure of nematode communities, described by index analysis, showed little temporal change and supported the use of nematodes as stable indicators. |
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