caa a22 4500 445890843 CHVBK 20180317145615.0 cr unu---uuuuu 170323e20110601xx s 000 0 eng 10.1007/s10750-011-0640-5 doi (NATIONALLICENCE)springer-10.1007/s10750-011-0640-5 Suspended material availability and filtration-biodeposition processes performed by a native and invasive bivalve species in streams [Elektronische Daten] [Carla Atkinson, Matt First, Alan Covich, Stephen Opsahl, Stephen Golladay] Unionid mussels are among the most threatened group of freshwater organisms globally. They are known for their ability to filter food particles from flowing and standing waters. However, invasive bivalve species, such as the Asian clam (Corbicula fluminea) in North America, have the potential to overlap in feeding and potentially out-compete the native species. Yet, the feeding preferences of unionid mussels and C. fluminea are incompletely understood. We hypothesized that Elliptio crassidens (native) and C. fluminea (invasive) would select for specific organic components present within seston. We examined changes in seston (dry mass and ash-free dry mass) resulting from bivalve feeding activity for three size classes of material that were isolated using gravimetric filtration. The treatments were also sub-sampled for flow cytometry (FC) which separated the suspended materials in the stream water into five categories: detritus, heterotrophic bacteria, picoautotrophs, nanoautotrophs, and heterotrophic nanoeukaryotes. Our results indicated that both species of bivalve showed preferences for organic and living materials. E. crassidens preferentially filtered nanoeukaryotes, whose decreases were associated with an increase in bacteria. In contrast, C. fluminea preferred smaller materials through selective filtration of picoautotrophs. In addition, both species increased the concentration of large materials toward the end of the experiment because of the suspension of their pseudofeces biodeposits. To our knowledge, this study is the first to examine grazing by bivalve species on natural stream particulate matter using FC. Our results suggest that native and non-native mussels have different functional roles, which has important implications for organic matter processing and food webs in streams. Springer Science+Business Media B.V., 2011 Filtration nationallicence Biodeposition nationallicence Flow cytometry nationallicence Unionid nationallicence Corbicula fluminea nationallicence Atkinson Carla Institute of Ecology, Odum School of Ecology, University of Georgia, Athens, GA, USA aut First Matt Department of Marine Sciences, University of Georgia, Athens, GA, USA aut Covich Alan Institute of Ecology, Odum School of Ecology, University of Georgia, Athens, GA, USA aut Opsahl Stephen Joseph W. Jones Ecological Research Center, 3988 Jones Center Drive, Newton, GA, USA aut Golladay Stephen Joseph W. Jones Ecological Research Center, 3988 Jones Center Drive, Newton, GA, USA aut Hydrobiologia Springer Netherlands 667/1(2011-06-01), 191-204 0018-8158 667:1<191 2011 667 10750 https://doi.org/10.1007/s10750-011-0640-5 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10750-011-0640-5 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Atkinson Carla Institute of Ecology, Odum School of Ecology, University of Georgia, Athens, GA, USA aut NATIONALLICENCE 700 1- First Matt Department of Marine Sciences, University of Georgia, Athens, GA, USA aut NATIONALLICENCE 700 1- Covich Alan Institute of Ecology, Odum School of Ecology, University of Georgia, Athens, GA, USA aut NATIONALLICENCE 700 1- Opsahl Stephen Joseph W. Jones Ecological Research Center, 3988 Jones Center Drive, Newton, GA, USA aut NATIONALLICENCE 700 1- Golladay Stephen Joseph W. Jones Ecological Research Center, 3988 Jones Center Drive, Newton, GA, USA aut NATIONALLICENCE 773 0- Hydrobiologia Springer Netherlands 667/1(2011-06-01), 191-204 0018-8158 667:1<191 2011 667 10750 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer