caa a22 4500 467885591 CHVBK 20180406152733.0 cr unu---uuuuu 170328e20060401xx s 000 0 eng 10.1007/s10021-005-0113-7 doi (NATIONALLICENCE)springer-10.1007/s10021-005-0113-7 Ecological Values of Shallow-Water Habitats: Implications for the Restoration of Disturbed Ecosystems [Elektronische Daten] [Cary Lopez, James Cloern, Tara Schraga, Amy Little, Lisa Lucas, Janet Thompson, Jon Burau] A presumed value of shallow-habitat enhanced pelagic productivity derives from the principle that in nutrient-rich aquatic systems phytoplankton growth rate is controlled by light availability, which varies inversely with habitat depth. We measured a set of biological indicators across the gradient of habitat depth within the Sacramento-San Joaquin River Delta (California) to test the hypothesis that plankton biomass, production, and pelagic energy flow also vary systematically with habitat depth. Results showed that phytoplankton biomass and production were only weakly related to phytoplankton growth rates whereas other processes (transport, consumption) were important controls. Distribution of the invasive clam Corbicula fluminea was patchy, and heavily colonized habitats all supported low phytoplankton biomass and production and functioned as food sinks. Surplus primary production in shallow, uncolonized habitats provided potential subsidies to neighboring recipient habitats. Zooplankton in deeper habitats, where grazing exceeded phytoplankton production, were likely supported by significant fluxes of phytoplankton biomass from connected donor habitats. Our results provide three important lessons for ecosystem science: (a) in the absence of process measurements, derived indices provide valuable information to improve our mechanistic understanding of ecosystem function and to benefit adaptive management strategies; (b) the benefits of some ecosystem functions are displaced by water movements, so the value of individual habitat types can only be revealed through a regional perspective that includes connectedness among habitats; and (c) invasive species can act as overriding controls of habitat function, adding to the uncertainty of management outcomes. Springer Science+Business Media, Inc., 2006 restoration nationallicence shallow-water habitat nationallicence pelagic production nationallicence food web nationallicence freshwater ecosystems nationallicence Lopez Cary US Geological Survey, 345 Middlefield Road MS 496, 94025, Menlo Park, California, USA aut Cloern James US Geological Survey, 345 Middlefield Road MS 496, 94025, Menlo Park, California, USA aut Schraga Tara US Geological Survey, 345 Middlefield Road MS 496, 94025, Menlo Park, California, USA aut Little Amy US Geological Survey, 345 Middlefield Road MS 496, 94025, Menlo Park, California, USA aut Lucas Lisa US Geological Survey, 345 Middlefield Road MS 496, 94025, Menlo Park, California, USA aut Thompson Janet US Geological Survey, 345 Middlefield Road MS 496, 94025, Menlo Park, California, USA aut Burau Jon US Geological Survey, Placer Hall, 6000 J Street, 95819, Sacramento, California, USA aut Ecosystems Springer-Verlag; www.springer-ny.com 9/3(2006-04-01), 422-440 1432-9840 9:3<422 2006 9 10021 https://doi.org/10.1007/s10021-005-0113-7 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10021-005-0113-7 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Lopez Cary US Geological Survey, 345 Middlefield Road MS 496, 94025, Menlo Park, California, USA aut NATIONALLICENCE 700 1- Cloern James US Geological Survey, 345 Middlefield Road MS 496, 94025, Menlo Park, California, USA aut NATIONALLICENCE 700 1- Schraga Tara US Geological Survey, 345 Middlefield Road MS 496, 94025, Menlo Park, California, USA aut NATIONALLICENCE 700 1- Little Amy US Geological Survey, 345 Middlefield Road MS 496, 94025, Menlo Park, California, USA aut NATIONALLICENCE 700 1- Lucas Lisa US Geological Survey, 345 Middlefield Road MS 496, 94025, Menlo Park, California, USA aut NATIONALLICENCE 700 1- Thompson Janet US Geological Survey, 345 Middlefield Road MS 496, 94025, Menlo Park, California, USA aut NATIONALLICENCE 700 1- Burau Jon US Geological Survey, Placer Hall, 6000 J Street, 95819, Sacramento, California, USA aut NATIONALLICENCE 773 0- Ecosystems Springer-Verlag; www.springer-ny.com 9/3(2006-04-01), 422-440 1432-9840 9:3<422 2006 9 10021 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer