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NEMATODE COMMUNITIES AS BIOINDICATORS OF ANTROPOGENIC INFLUENCE IN AGROECOSYSTEMS

NEMATODE COMMUNITIES AS BIOINDICATORS OF ANTROPOGENIC INFLUENCE IN AGROECOSYSTEMS. Mirjana BRMEZ, Marija IVEZIC, Emilija RASPUDIC, Vesna TRIPAR, Renata BALICEVIC University of J.J. Strossmayer in Osijek, Faculty of Agriculture in Osijek, Croatia. Nematodes as bioindicators.

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NEMATODE COMMUNITIES AS BIOINDICATORS OF ANTROPOGENIC INFLUENCE IN AGROECOSYSTEMS

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  1. NEMATODE COMMUNITIES AS BIOINDICATORS OF ANTROPOGENIC INFLUENCE IN AGROECOSYSTEMS Mirjana BRMEZ, Marija IVEZIC, Emilija RASPUDIC, Vesna TRIPAR, Renata BALICEVIC University of J.J. Strossmayer in Osijek, Faculty of Agriculture in Osijek, Croatia

  2. Nematodes as bioindicators • they occur in almost every habitat (terrestrial, aquatic and marine), • they occure with many species per sample or habitat, • they respond quickly to environmental changes, • they show specific respond to various types of pollution or disturbances, • they are in close contact with dissolved compounds in free soil water,

  3. they are easily sampled and extacted from the soil, the sampling can be done in any time of the year, storage of the samples requires little space Analyses of nematode community structure can be related to feeding types (trophic group), c-p groups from 1-5, absolute abundances, number of genera, Maturity index, Plant parasitic index etc. Nematodes as bioindicators

  4. “Persisters” long life-cycle sensitive to disturbances low reproduction rate they hardly fluctuate in number over the year never belong to dominant species in the sample have few small gonads, and produced large eggs “Colonizers” short life cycle tolerance to disturbances high reproductive rate high colonization ability have voluminous gonads, release large numbers of small eggs, and are often viviparous C-p groups (1-5)

  5. Maturity index (Bongers, 1990) • v(i) – (c-p) value assigned to family(i) • f(i) - the frequency of family (i) in a sample • Lower index reflect disturbance

  6. Aim The objective of this investigation was to determine if the nematode communities in the soil could serve as bioindicators of anthropogenic activities in agroecosystems.

  7. MATERIAL AND METHODS • TREATMENTS: • Poplar forest, • Arable land with standard tillage regimes – wheat, • Arable land with standard tillage regimes – corn. • Sampling: in spring period 2001, in the 4 replicates, using sonda Ø 2 cm, on the depth of 20 cm

  8. MATERIAL AND METHODS • Extaction of nematodes – 100 g of soil - Seinhorst method (1956) • Identification – genus level

  9. Total number of nematodes and number of genera 3000 25 2500 20 2000 15 No. of nematodes in 100 ml of soil number of genera 1500 10 1000 5 500 0 0 poplar wheat corn total no. of nematodes number of genera RESULTS

  10. Trophic structure % 60 50 40 30 20 10 0 poplar wheat corn Bacterial feeders Fungal feeders Omnivorous Predators Plant feeders RESULTS

  11. RESULTS

  12. CONCLUSION On the base of this investigations we can conclude that nematode communities could serve as a very bood bioindicator of antropogenic influence in agroecosystem.

  13. Acknowledgement The investigations are suported by the Ministry of Science and Technology in Croatia (Project- 079024).

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