“…2) The classifi cation of trophic groups based on known feeding habits or stoma and esophageal morphology was assigned to: a) Bacterial feeders (BF), b) Fungal feeders (FF), c) Plant feeders (PF), and d) Omnivores-predators (Bongers, 1990;Yeates et al, 1993). 3) The classifi cation of nematode colonizer-persister (cp) values based on life strategies according to Bongers (Bongers, 1990;Bongers & Bongers, 1998;Bongers, 1999). 4) Diversity index: a) Shannon-Weaver index (H'): PPI =∑υi fi ', where vi is the c-p value for the plant-parasitic nematodes to the i-th nematode genus and fi is the proportion of genus in the plant-parasitic nematode community (Bongers 1990, Bongers et al 1997, b) Maturity index (MI): MI = ∑υi fi , where vi is the c-p value for free-living nematodes to the i-th nematode genus and fi ' is the proportion of the genus in the free-living nematode community (Bongers, 1990;Bongers, 1999), (Bongers et al 1997), d) ∑MI = ∑υi Pi, modifi ed maturity index, where vi is the c-p value for free-living and plant parasitic nematodes to the i-th nematode genus and pi is the proportion of the genus in the whole nematode community (Yeates, 1994).…”