caa a22 4500 445384182 CHVBK 20180317143027.0 cr unu---uuuuu 170323e20110801xx s 000 0 eng 10.1007/s10021-011-9446-6 doi (NATIONALLICENCE)springer-10.1007/s10021-011-9446-6 The Role of Abandoned Channels as Refugia for Sustaining Pioneer Riparian Forest Ecosystems [Elektronische Daten] [John Stella, Maya Hayden, John Battles, Hervé Piégay, Simon Dufour, Alexander Fremier] In disturbance-prone ecosystems, organisms often persist in spatial refugia during stressful periods. A clear example is the colonization of abandoned river channels by pioneer riparian trees. Here, we examine the prominence of this establishment pathway for a foundation tree species (Fremont cottonwood, Populus fremontii) within the riparian corridor of a large river, the Sacramento River in central California. We quantified the total proportion of forest that initiated as a result of channel abandonment for a 160-km reach, analyzed concurrent patterns of tree establishment with floodplain accretion and sedimentation history, and developed a conceptual model of biogeomorphic evolution of abandoned channels. Historical air photo analysis indicated that stands associated with abandoned channels comprised more than 50% of the total extant cottonwood forest area. Tree-ring evidence showed that cottonwood stands commonly developed immediately following abandonment, and the recruitment window ranged from 4 to 40years, but was less than 10years at most sites. Rates of floodplain rise and fine sediment accumulation were high in young sites and decreased logarithmically over time. Together, these results suggest that abandoned channels are an important refuge for cottonwood recruitment, that the greatest opportunity for colonization occurs within a short period after the cutoff event, and that sedimentation processes influence the duration of the colonization window. On rivers where tree recruitment along the active channel is severely limited by hydrologic regulation and/or land management, abandoned channel refugia may play an even more important role in sustaining an ecologically functional riparian corridor. Preserving bank erosion, active meander corridors and forest regeneration zones created by cutoff events are therefore key conservation measures on shifting rivers. Springer Science+Business Media, LLC, 2011 abandoned channel nationallicence cottonwood nationallicence Salicaceae nationallicence floodplain nationallicence recruitment refugia nationallicence riparian nationallicence Sacramento River nationallicence dendrochronology nationallicence oxbow nationallicence persistence strategy nationallicence Stella John Department of Forest and Natural Resources Management, State University of New York College of Environmental Science and Forestry, One Forestry Drive, 13210, Syracuse, New York, USA aut Hayden Maya Department of Environmental Science, Policy, and Management, University of California, 94720, Berkeley, California, USA aut Battles John Department of Environmental Science, Policy, and Management, University of California, 94720, Berkeley, California, USA aut Piégay Hervé CNRS UMR 5600 EVS/Site ENS Lyon, University of Lyon, 15 Parvis René Descartes, BP 7000, 69342, Lyon Cedex 07, France aut Dufour Simon COSTEL-CNRS LETG UMR 6554, Département de Géographie, Université Rennes 2, Place du Recteur Henri Le Moal, 35043, Rennes Cedex, France aut Fremier Alexander Department of Fish and Wildlife Resources, University of Idaho, Box 441136, 83844-1136, Moscow, Idaho, USA aut Ecosystems Springer-Verlag 14/5(2011-08-01), 776-790 1432-9840 14:5<776 2011 14 10021 https://doi.org/10.1007/s10021-011-9446-6 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10021-011-9446-6 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Stella John Department of Forest and Natural Resources Management, State University of New York College of Environmental Science and Forestry, One Forestry Drive, 13210, Syracuse, New York, USA aut NATIONALLICENCE 700 1- Hayden Maya Department of Environmental Science, Policy, and Management, University of California, 94720, Berkeley, California, USA aut NATIONALLICENCE 700 1- Battles John Department of Environmental Science, Policy, and Management, University of California, 94720, Berkeley, California, USA aut NATIONALLICENCE 700 1- Piégay Hervé CNRS UMR 5600 EVS/Site ENS Lyon, University of Lyon, 15 Parvis René Descartes, BP 7000, 69342, Lyon Cedex 07, France aut NATIONALLICENCE 700 1- Dufour Simon COSTEL-CNRS LETG UMR 6554, Département de Géographie, Université Rennes 2, Place du Recteur Henri Le Moal, 35043, Rennes Cedex, France aut NATIONALLICENCE 700 1- Fremier Alexander Department of Fish and Wildlife Resources, University of Idaho, Box 441136, 83844-1136, Moscow, Idaho, USA aut NATIONALLICENCE 773 0- Ecosystems Springer-Verlag 14/5(2011-08-01), 776-790 1432-9840 14:5<776 2011 14 10021 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer