Response by soil nematode populations and the soil microbial biomass to a rain episode in the hot, dry Negev Desert

Steinberger, Yosef; Sarig, S.

doi:10.1007/bf00361406

Cited by 63 publications

(35 citation statements)

References 15 publications

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“…Freckman et al (1987) reported that densities of total nematodes, fungivores, bacterivores, and omnivores were not affected by long-term irrigation treatment (one year), while the density of phytophage nematodes increased. In a more short-term study, Steinberger & Sarig (1993) showed that total nematode density increased significantly after single bouts of irrigation, and that density increased with the amount of added water. Fungal-and bacterial-feeding nematodes were the main groups responsible for this increase.…”

Section: Discussionmentioning

confidence: 95%

Long-term experimental manipulation of moisture conditions and its impact on moss-living tardigrades

Jönsson¹

2007

J Limnol

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Section: Discussionmentioning

confidence: 95%

Long-term experimental manipulation of moisture conditions and its impact on moss-living tardigrades

Jönsson¹

2007

J Limnol

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“…The changes in patch-size heterogeneity are proposed as increasing in proportion to the decrease in soil water availability, where soil moisture availability is known to determine primary production (Saleska et al, 1999), nitrogen and carbon mineralization (Leiros et al, 1999;Savin et al, 2001), and soil organism distribution and activity (Steinberger & Sarig, 1993). On the other hand, temperature, as one of the principal environmental agents determining soil biotic activity, has been found to be no less influential than soil moisture (Wagai et al, 1998;Uvarov, 2003).…”

Section: Discussionmentioning

confidence: 99%

“…The nematodes from each sample were collected and identified according to order, family, and genus using a compound microscope. Nematodes were classified according to known feeding habitats or stoma and esophageal morphology (Steinberger & Sarig, 1993;Pen-Mouratov et al, 2004) into the following trophic groups (Yeates et al, 1993): (1) bacteria-feeding; (2) fungi-feeding; (3) plant-parasites; and (4) omnivore-predators. The total number of nematodes was counted and adjusted to 100 g dry soil.…”

Section: Laboratory Analysismentioning

confidence: 99%

“…The characteristics of the nematode communities were described using the following indices: (1) absolute abundance of individuals adjusted to 100 g -1 dry soil TNEM (total number of free-living nematodes); (2) abundance of omnivore-predator (OP), plant-parasitic (PP), fungi-feeding (FF) and bacteria-feeding (BF) nematodes (trophic structure) (Steinberger & Loboda, 1991;Steinberger & Sarig, 1993;Liang et al, 2000); (3) WI=(FF+BF)/PP (Wasilewska, 1994); (4) fungivore/bacterivore (F/B) ratio, F/B=FF/BF (Twinn, 1974); (5) trophic diversity (T), T=1/∑P i 2 , where P i is the proportion of the i-th trophic group (Heip et al, 1988); (6) Simpson's dominance index (λ), λ=∑P i 2 (Simpson, 1949); (7) Shannon-Weaver index (H'), H'=-∑Pi I (lnPi I ), where p is the proportion of individuals in the i-th taxon (Shannon & Weaver, 1949); (8) maturity index (MI), MI=∑υ ί fi/n, where υ ί , is the c-p value assigned by Bongers (1990Bongers ( , 1999 of the i-th genus in the nematode, fi is the frequency of family i in sample and n is the total number of individuals in a sample (Neher & Darby, 2005). The c-p values describe the nematode life strategies, and range from 1 (colonizers, tolerant to disturbance) to 5 (persisters, sensitive to disturbance); (9) plant-parasite index (PPI) (Bongers, 1990); (10) maturity modification index (MMI), including plant-feeding nematodes (Yeates, 1994); (11) evenness (J'), J'=H'/ln(S), where S is the number of taxa (Yeates & King, 1997); (12) species richness, SR=(S-1)/ln(N), where S is the number of taxa and N is the number of individuals identified (Yeates & King, 1997); (13) basal index (BI) = 100  (b/(b + e + s)); (14) structure index (SI) = 100 x (s/(s + b)), where b = 0.8 x (Fu2+Ba2); s = 0.8 x Ca2 + 1.8 x Σ(X3) + 3.2 x Σ(X4) + 5.0 x Σ(X5); e = 3.2 x Ba1 + 0.8 x Fu2; and (15) enrichment index (EI) = 100 x (e/(e + b)) (Ferris et al, 2001;Hohberg, 2003;Ferris et al, 2004;Liang et al, 2005).…”

Section: Ecological Indices and Statistical Analysismentioning

confidence: 99%

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Effect of sand-dune slope orientation on soil free-living nematode abundance and diversity

Pen-Mouratov

Hu²,

Hindin

et al. 2010

Helminthologia

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179 SummaryThe spatial and temporal dynamics and composition of a soil free-living nematode community were studied in order to determine the impact of slope orientation on the community on the xeric south-and the mesic north-facing sand-dune slopes. A significant effect of sampling location on organic matter, total number of free-living nematodes, and trophic diversity was found. Although soil moisture had a significant effect on separate nematode trophic groups and on most of the applied ecological indices, no differences in soil moisture were observed between slopes. Organic matter was found to have a significant effect on the fungivore nematodes. The obtained results indicate that the south-facing slope is more favorable for the observed free-living nematodes than the other sampling sites. Twenty-four of the 77 nematode species that were found in the observed area showed dependence on dune slope orientation. The fungibacteria ratio, Simpson's dominance index, and basal index were useful tools for determining slope differences.

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“…The recovered organisms were counted using a compound microscope and preserved in formalin. The nematodes from each sample were collected and classified according to known feeding habitats or stoma and esophageal morphology [8,24]. The total number of nematodes (Tnem) was recalculated and expressed as the number of individuals per 100 g dry soil.…”

Section: Biotic Parametersmentioning

confidence: 99%

Changes in soil free-living nematode communities and their trophic composition along a climatic gradient

Levi¹,

Sherman²,

Pen-Mouratov³

et al. 2012

OJE

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Ambiguity exists concerning the effects of climate on soil nematode-community composition. In this study, we examined the free-living nematode communities in soil along a climatic gradient representing humid-Mediterranean, Mediterranean, semi-arid, and arid climate types. The relationships between abiotic soil characteristics (organic carbon, soil moisture (SM), water-holding capacity) and nematode parameters, such as abundance, trophic group composition, and diversity indices, were explored in the context of climate and seasonality. Nematode abundance was lowest at the arid site. At the humidMediterranean and Mediterranean locations, nematode abundance reached its peak in winter, while at the semi-arid and arid sites, an almost opposite trend was observed, with lowest abundances in winter, presumably due to a nutrient washout from the soil profile during the rainy season. On the trophic level, one trophic group demonstrated a positive correlation with SM and one trophic group demonstrated a negative one at each location, while the other two groups remained constant. Fungi-feeding nematodes were found to be unaffected by SM at the humidMediterranean and Mediterranean locations, while at the semi-arid and arid sites their proportion increased in correlation with decreasing SM. Bacteria-feeders increased with SM at the arid site, were unaffected at the semi-arid location, and decreased with SM at the humid-Mediterranean and Mediterranean sites. Plant-parasites were associated with SM only at the humidMediterranean site. Omnivores-predators were positively affected by SM at the two middle locations, staying constant at the humid-Mediterranean and arid sites. These findings point to the strong linkage existing between nematode trophic behavior and climatic factors, demonstrating distinctive communal fingerprints for each climate type.

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Response by soil nematode populations and the soil microbial biomass to a rain episode in the hot, dry Negev Desert

Cited by 63 publications

References 15 publications

Long-term experimental manipulation of moisture conditions and its impact on moss-living tardigrades

Long-term experimental manipulation of moisture conditions and its impact on moss-living tardigrades

Effect of sand-dune slope orientation on soil free-living nematode abundance and diversity

Changes in soil free-living nematode communities and their trophic composition along a climatic gradient

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