caa a22 4500 445892935 CHVBK 20180317145622.0 cr unu---uuuuu 170323e20110301xx s 000 0 eng 10.1007/s10750-010-0570-7 doi (NATIONALLICENCE)springer-10.1007/s10750-010-0570-7 Effects of invasive macrophyte on trophic diversity and position of secondary consumers [Elektronische Daten] [Katya Kovalenko, Eric Dibble] Invasive species are one of the widespread stressors of aquatic ecosystems. Several studies document food web effects of invasive fish, but little information is available on the effects of invasive macrophytes. We studied differences in food chain length as well as trophic position and trophic diversity of fish and odonates in lakes dominated by native plants or invasive Eurasian watermilfoil. Trophic position and food chain length were determined using baseline-adjusted δ15N isotope signatures. Trophic diversity, or isotope niche width, was estimated from convex hull area analysis. Results show that trophic position of secondary consumers was not affected by the invasive macrophyte, whereas trophic diversity was greater in watermilfoil-dominated lakes. The direction of isotopic niche expansion was different in fish and odonates, suggesting potential decoupling in predator-prey interactions. This study shows that dominant non-native macrophytes may cause significant changes in food web structure of invaded ecosystems. Trophic diversity may be a more sensitive indicator of environmental stress than trophic position and has the potential to be used for assessment of invasive species impacts and restoration success. Springer Science+Business Media B.V., 2010 Odonata nationallicence Bluegill nationallicence Largemouth bass nationallicence Stable isotopes nationallicence Exotic nationallicence Myriophyllum spicatum nationallicence Kovalenko Katya Biological Sciences, University of Windsor, N9B 3P4, Windsor, ON, Canada aut Dibble Eric Department of Wildlife, Fisheries and Aquaculture, Mississippi State University, PO Box 9690, 39762, Mississippi State, MS, USA aut Hydrobiologia Springer Netherlands 663/1(2011-03-01), 167-173 0018-8158 663:1<167 2011 663 10750 https://doi.org/10.1007/s10750-010-0570-7 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10750-010-0570-7 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Kovalenko Katya Biological Sciences, University of Windsor, N9B 3P4, Windsor, ON, Canada aut NATIONALLICENCE 700 1- Dibble Eric Department of Wildlife, Fisheries and Aquaculture, Mississippi State University, PO Box 9690, 39762, Mississippi State, MS, USA aut NATIONALLICENCE 773 0- Hydrobiologia Springer Netherlands 663/1(2011-03-01), 167-173 0018-8158 663:1<167 2011 663 10750 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer