Seasonal dynamics in the community structure and trophic structure of testate amoebae inhabiting the Sanjiang peatlands,Northeast China |
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| Institution: | 1. Department of Environmental Resources and Geohazards, Institute of Geography and Spatial Organization, Polish Academy of Sciences, Twarda 51/55, 00-818 Warszawa, Poland;2. GFZ German Research Centre for Geosciences, Section 5.2–Climate Dynamics and Landscape Evolution, Telegrafenberg, D-14473 Potsdam, Germany;3. Department of Biogeography and Paleoecology, Adam Mickiewicz University, Krygowskiego 10, 61-680 Poznań, Poland;4. Laboratory of Wetland Ecology and Monitoring, Adam Mickiewicz University, Krygowskiego 10, 61-680 Poznań, Poland;5. Department of Invertebrate Zoology and Hydrobiology, University of ?ód?, Banacha 12/16, 90-237 ?ód?, Poland;6. Institute of Geological Sciences, Polish Academy of Sciences, Twarda 51/55, 00-818 Warsaw, Poland;7. Institute of Geology, Faculty of Geographical and Geological Science, Adam Mickiewicz University, Maków Polnych, 16 61-606 Poznań, Poland;8. Institute of Geography, Pedagogical University of Cracow, Podchor??ych 2, 30-084 Kraków, Poland;9. Kujawsko–Pomorski Research Centre, Institute of Technology and Life Sciences in Falenty, Glinki 60, 85-174 Bydgoszcz, Poland;10. Geology and Paleogeography Unit, Faculty of Geosciences, Institute of Marine and Coastal Sciences, University of Szczecin, Mickiewicza 18, 70-383 Szczecin, Poland;11. Department of Geomorphology and Palaeogeography, Faculty of Geographical Sciences, University of ?ód?, ul. Narutowicza 88, PL 90-139 ?ód?, Poland;12. GADAM Centre of Excellence, Department of Radioisotopes, Institute of Physics – CSE, Silesian University of Technology, Konarskiego 22B, 44-100 Gliwice, Poland |
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| Abstract: | Peatlands cover 3% of the earth’s land surface but contain 30% of the world’s soil carbon pool. Microbial communities constitute a crucial detrital food web for nutrient and carbon cycling in peatlands. Heterotrophic protozoans are considered top predators in the microbial food web; however, they are not yet well understood. In this study, we investigated seasonal dynamics in the community and the trophic structure of testate amoebae in four peatlands. Testate amoebae density and biomass in August were significantly higher than those in May and October. The highest density, 6.7 × 104 individual g?1 dry moss, was recorded in August 2014. The highest biomass, 7.7 × 102 μg C g?1 dry moss, was recorded in August 2013. Redundancy analyses showed that water-table depth was the most important factor, explaining over one third of the variance in fauna communities in all sampled seasons. High trophic position taxa dominated testate amoebae communities. The Shannon diversity index and community size structure index declined from August to October in 2013 and from May to October in 2014. These seasonal patterns of testate amoebae indicated the seasonal variations of the peatlands’ microbial food web and are possibly related to the seasonal carbon dynamics in Northeast Chinese peatlands. |
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| Keywords: | Diversity Microbial food web Size structure Testate amoebae Trophic position Wetland |
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