caa a22 4500 445894571 CHVBK 20180317145627.0 cr unu---uuuuu 170323e20110401xx s 000 0 eng 10.1007/s10750-010-0583-2 doi (NATIONALLICENCE)springer-10.1007/s10750-010-0583-2 Fish and land use influence Gammarus lacustris and Hyalella azteca (Amphipoda) densities in large wetlands across the upper Midwest [Elektronische Daten] [Michael Anteau, Alan Afton, Andrea Anteau, E. Moser] Gammarus lacustris and Hyalella azteca (hereafter G. lacustris and H. azteca, respectively) are important components of secondary production in wetlands and shallow lakes of the upper Midwest, USA. Within the past 50years, amphipod densities have decreased while occurrences of fish and intensity of agricultural land use have increased markedly across this landscape. We investigated influences of fish, sedimentation, and submerged aquatic vegetation (SAV) on densities of G. lacustris and H. azteca in semipermanent and permanent wetlands and shallow lakes (n=283) throughout seven eco-physiographic regions of Iowa, Minnesota, and North Dakota during 2004-2005. G. lacustris and H. azteca densities were positively correlated with densities of SAV (P<0.001 and P<0.001, respectively). Both species were negatively correlated with densities of large fish (non-Cyprinidae; P=0.01 and P=0.013, respectively) and with high densities of fathead minnows (Pimephales promelas; P<0.001 and P=0.033, respectively). H. azteca densities also were negatively correlated with densities of small fish (e.g., other minnows [Cyprinidae] and sticklebacks [Gasterosteidae]; P=0.048) and common carp (Cyprinus spp.; P=0.022). G. lacustris densities were negatively correlated with high levels of suspended solids (an index for sedimentation; P<0.001). H. azteca densities were positively correlated with the width of upland-vegetation buffers (P=0.004). Our results indicate that sedimentation and fish reduce amphipod densities and may contribute to the current low densities of amphipods in the upper Midwest. Thus, removing/excluding fish, and providing a thick buffer of upland vegetation around wetlands may help restore amphipod densities and wetland and water quality within this landscape. Springer Science+Business Media B.V. (outside the USA), 2011 Agriculture nationallicence Crustacean nationallicence Pothole nationallicence Predation nationallicence Run-off nationallicence Sedimentation nationallicence Shallow lake nationallicence Anteau Michael School of Renewable Natural Resources, Louisiana State University, 70803, Baton Rouge, LA, USA aut Afton Alan U.S. Geological Survey, Louisiana Cooperative Fish and Wildlife Research Unit, Louisiana State University, 70803, Baton Rouge, LA, USA aut Anteau Andrea U.S. Geological Survey, National Wetlands Research Center, 70506, Lafayette, LA, USA aut Moser E. Department of Experimental Statistics, Louisiana State University, 70803, Baton Rouge, LA, USA aut Hydrobiologia Springer Netherlands 664/1(2011-04-01), 69-80 0018-8158 664:1<69 2011 664 10750 https://doi.org/10.1007/s10750-010-0583-2 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10750-010-0583-2 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Anteau Michael School of Renewable Natural Resources, Louisiana State University, 70803, Baton Rouge, LA, USA aut NATIONALLICENCE 700 1- Afton Alan U.S. Geological Survey, Louisiana Cooperative Fish and Wildlife Research Unit, Louisiana State University, 70803, Baton Rouge, LA, USA aut NATIONALLICENCE 700 1- Anteau Andrea U.S. Geological Survey, National Wetlands Research Center, 70506, Lafayette, LA, USA aut NATIONALLICENCE 700 1- Moser E. Department of Experimental Statistics, Louisiana State University, 70803, Baton Rouge, LA, USA aut NATIONALLICENCE 773 0- Hydrobiologia Springer Netherlands 664/1(2011-04-01), 69-80 0018-8158 664:1<69 2011 664 10750 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer