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Effect of induced anoxia on nematode densities, vertical distribution patterns and recovery at the Gulf of Trieste (Northern Adriatic Sea)

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Slide 1 Effect of induced anoxia on nematode densities, vertical distribution patterns and recovery at the Gulf of Trieste (Northern Adriatic Sea) Mehrshad Taheri1,2, Mateja Grego3, Bettina Riedel4, Magda Vincx1 and Jan Vanaverbeke1 1. Ghent University, Biology Department, Marine Biology Research Group, Krijgslaan 281, S8, 9000 , Ghent, Belgium. E-mail: [email protected] 2. Iranian National Institute for Oceanography. 9 Etemadzadeh Ave, West Fatemi Str, Tehran. Iran. 3. Marine Biology Station Piran, National Institute of Biology, Fornace 41, 6330 Piran, Slovenia. 4. Department of Limnology and Oceanography, University of Vienna, Althanstrasse 14, 1090, Vienna, Austria. Introduction v 0 – 0.5 cm 0.5 – 1 cm 1 – 1.5 cm 1.5 – 2 cm 2 – 3 cm 3 – 4 cm 4 – 5 cm Increasing oxygen stress in the gulf: • a semi-enclosed • shallow depth with a fine-grained substrate • a high riverine input • high productivity (marine snow events) • long water residence in summer/autumn Normoxia 1 9 days anoxia 9 days recovery Normoxia 2 1 month anoxia 1 month recovery 10 months anoxia 3 months recovery Material and Method Induced anoxia Three replicates Making slides Identification Results Anoxia Recovery duration of the experimental anoxia and recovery Total density till 5 cm Total density till 2 cm Total species number till 5 cm Total species number till 2 cm Higest in normoxia and lowest in anoxia 10 months Vertical density till 5 cm Vertical density till 2 cm Total shannon diversity till 5 cm Total shannon diversity till 2 cm Higest in normoxia and lowest in anoxia1 and 10 months Total evenness till 5 cm Total evenness till 2 cm No significant differences Anoxia 10 months >normoxia >anoxia1 month Data analysis till 5 cm with 1 cm interval till 2 cm with 0.5 cm interval Total density till 5 cm Total density till 2 cm Total species number till 5 cm Total species number till 2 cm No significant differences Total shannon diversity ti

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