Abstract:
:Using laboratory microcosms, we studied direct and indirect interactions among different components of bi- and tritrophic communities. Filamentous cyanobacteria (Phormidium sp.) and autotrophic flagellates (Chlorogonium elongatum) were primary producers. The second trophic level was represented by ciliates Furgasonia blochmanni and Pseudomicrothorax dubius grazing on the filamentous cyanobacteria and two filter feeders, Euplotes octocarinatus and Stylonychia pustulata, feeding on the autotrophic flagellates. An oligochaete, Chaetogaster sp., was used as the top predator. An experiment was carried out for all combinations of two factors: (1) the identity of the cyanobacteria consumer (Furgasonia or Pseudomicrothorax) and (2) the presence or absence of the top predator. Significant effects of the treatments on both the abundance of cyanobacteria and filter feeding ciliates and predator-induced defense in Phormidium and Euplotes were observed in a 36-day experiment. The experiment showed that the substitution of one species (Furgasonia) for another (Pseudomicrothorax) seemingly playing the same ecological role may lead to significant changes in the whole community.
journal_name
FEMS Microbiol Ecoljournal_title
FEMS microbiology ecologyauthors
Fyda J,Nosek J,Wiackowski K,Pajdak-Stós A,Fiałkowska Edoi
10.1111/j.1574-6941.2009.00676.xsubject
Has Abstractpub_date
2009-06-01 00:00:00pages
329-39issue
3eissn
0168-6496issn
1574-6941pii
FEM676journal_volume
68pub_type
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