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Opinions and Suggestions on Nematode Faunal Analysis

Howard Ferris

Howard Ferris

Department of Entomology and Nematology, University of CaliforniaDavis, USA
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Ferris, Howard
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Ingrid Varela Benavides

Ingrid Varela Benavides

Instituto Tecnológico de Costa RicaSan Carlos, Costa Rica
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Benavides, Ingrid Varela
  
24 dic 2024
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Categoria dell'articolo: Review
Pubblicato online: 24 dic 2024
Ricevuto: 08 lug 2024
DOI: https://doi.org/10.2478/jofnem-2024-0049
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© 2024 Howard Ferris et al., published by Sciendo
This work is licensed under the Creative Commons Attribution 4.0 International License.

Figure 1:

A: Nematode Faunal Analysis Model per Ferris et al., 2001) with sample data for four locations; B: Components of an Herbivore Index; C: Emended Faunal Analysis Model with Herbivore Index incorporated with sample data for four locations.
A: Nematode Faunal Analysis Model per Ferris et al., 2001) with sample data for four locations; B: Components of an Herbivore Index; C: Emended Faunal Analysis Model with Herbivore Index incorporated with sample data for four locations.

Figure 2:

A: Effect on Enrichment Index of resource diminution over 9 months (data from Ferris and Matute, 2003); B: Succession in the Enrichment and Structure Footprint for 2 years following resource amendment. Based on a field trial by Dr. James Downer, Hansen Research and Extension Center, Ventura County, California.
A: Effect on Enrichment Index of resource diminution over 9 months (data from Ferris and Matute, 2003); B: Succession in the Enrichment and Structure Footprint for 2 years following resource amendment. Based on a field trial by Dr. James Downer, Hansen Research and Extension Center, Ventura County, California.

Figure 3:

A: Hypothetical effects of primary forest clearing; letters indicate expected locations of the intersection of enrichment and structure trajectories after the disturbances, W: residual primary forest, X: secondary forest, Y: tree plantation, Z: pasture; B: Actual Faunal Analysis of residual primary forest, secondary forest, tree plantation and pasture.; C: Hypothetical auto-regeneration of enrichment and structure indicator components of the soil food web after a major disturbance, note time scale differences; D: Consistency of c-p 4 and 5 taxa 3 to 30 years after a disturbance as a percentage of those in primary forest. Data from Varela-Benavides et al. (2022).
A: Hypothetical effects of primary forest clearing; letters indicate expected locations of the intersection of enrichment and structure trajectories after the disturbances, W: residual primary forest, X: secondary forest, Y: tree plantation, Z: pasture; B: Actual Faunal Analysis of residual primary forest, secondary forest, tree plantation and pasture.; C: Hypothetical auto-regeneration of enrichment and structure indicator components of the soil food web after a major disturbance, note time scale differences; D: Consistency of c-p 4 and 5 taxa 3 to 30 years after a disturbance as a percentage of those in primary forest. Data from Varela-Benavides et al. (2022).

Sample calculation of Herbivore Index, HI = (100 (Σ hci ni) / (hc6 Σ ni) for integration with Emended Nematode Faunal Analysis Model – Figs_ 1 B,C)

Genus Functional Class Sample Abundance ni Weight hci Weighted. Abundance hci*ni
Tylenchorhynchus hc2 Migratory ectoparasites 54 0.008 0.432
Pratylenchus hc3 Migratory endoparasites 13 0.581 42.423
Belonolaimus hc4 Sedentary ectoparasites 73 0.656 7.872
Rotylenchulus hc5 Semi-endoparasites 12 0.128 1.664
Meloidogyne hc6 Sedentary endoparasites 45 34.942 1572.39
Total Abundance (Σ ni) 197
Total Weighted Abundance (Σ hci ni) 1624.77
Herbivore Index (100 (Σ hci ni) / (hc6 Σ ni)) 23.60

Herbivore impact channel in Nematode Faunal Analysis with damage potential based on the average body mass of adult females in each h-c category (Fig_ 1B) (Body mass data from Nemaplex accessed June 2024)_

h-c category Female Body Mass μg hci Number of observations
1. Root hair feeders 0.031 483
2. Migratory ectoparasites 0.008 274
3. Migratory endoparasites 0.581 350
4. Sedentary ectoparasites 0.656 1012
5. Semi-endoparasites 0.128 412
6. Sedentary endoparasites 34.942 606
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