caa a22 4500 60622694X CHVBK 20210128101155.0 cr unu---uuuuu 210128e20150601xx s 000 0 eng 10.1007/s10641-015-0377-5 doi (NATIONALLICENCE)springer-10.1007/s10641-015-0377-5 Movement patterns and feeding behavior of juvenile salmon ( Oncorhynchus spp.) along armored and unarmored estuarine shorelines [Elektronische Daten] [Sarah Heerhartz, Jason Toft] Estuarine nearshore environments are important habitats for many organisms, including juveniles of several Pacific salmon species (Oncorhynchus spp.). These habitats provide shallow water and high prey productivity, but are increasingly modified by anthropogenic activity including shoreline armoring, which disrupts connectivity between aquatic and terrestrial realms and artificially steepens the shore. Such effects may have adverse consequences for juvenile salmon, particularly Chinook (O. tshawytscha) and chum (O. nerka), which are known to rely on shallow, productive nearshore habitats for foraging and refuge from predators during their outmigration from natal streams to the sea. We developed snorkel methods to quantify feeding rates, movement rates, and path complexity of juvenile salmon along armored and unarmored shorelines in Puget Sound, WA, USA. We found that juvenile salmon had relatively high feeding rates along all shoreline types, but that path straightness and movement rates showed some variation between armored and unarmored sites. Feeding fish swam in more complex paths and were observed in larger schools than non-feeding fish, and path straightness and movement rate were negatively correlated with proportion of time feeding. Feeding behavior, school size, and movement rates also showed variation by species. Shoreline type (armored or unarmored) influenced juvenile salmon distribution, and unarmored shorelines appear to accommodate a greater diversity of movement patterns than armored shorelines. Our results show that juvenile salmon feed at high rates along armored and unarmored estuarine shorelines, thus decreased prey availability or altered prey resources are likely the most detrimental foraging effects of armoring in estuarine nearshore ecosystems. Springer Science+Business Media Dordrecht, 2015 Juvenile salmon nationallicence Shoreline armoring nationallicence Snorkel survey nationallicence Feeding rates nationallicence Estuarine nearshore nationallicence Movement rates nationallicence Heerhartz Sarah School of Aquatic and Fishery Sciences, University of Washington, Box 355020, 98195, Seattle, WA, USA aut Toft Jason School of Aquatic and Fishery Sciences, University of Washington, Box 355020, 98195, Seattle, WA, USA aut Environmental Biology of Fishes Springer Netherlands 98/6(2015-06-01), 1501-1511 0378-1909 98:6<1501 2015 98 10641 https://doi.org/10.1007/s10641-015-0377-5 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s10641-015-0377-5 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Heerhartz Sarah School of Aquatic and Fishery Sciences, University of Washington, Box 355020, 98195, Seattle, WA, USA aut NATIONALLICENCE 700 1- Toft Jason School of Aquatic and Fishery Sciences, University of Washington, Box 355020, 98195, Seattle, WA, USA aut NATIONALLICENCE 773 0- Environmental Biology of Fishes Springer Netherlands 98/6(2015-06-01), 1501-1511 0378-1909 98:6<1501 2015 98 10641