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oai:drum.lib.umd.edu:1903/82462016-03-29T06:55:03Zcom_1903_11810com_1903_12com_1903_19654com_1903_2col_1903_2749col_1903_19655col_1903_3

Koch, Evamaria Davison, Ian Jordan, Terry Lynn Digital Repository at the University of Maryland University of Maryland (College Park, Md.) Marine-Estuarine-Environmental Sciences 2008-06-20T05:39:23Z 2008-06-20T05:39:23Z 2008-05-12 http://hdl.handle.net/1903/8246 I examined the physiological response of two marine macrophytes, the brown alga Saccharina latissima and the angiosperm Zostera marina, to water flow in nature and in controlled experiments. Limitation of photosynthesis of both species by the availability of dissolved inorganic carbon (DIC) was increased under low current velocities. Physiological acclimation to low water flow occurred via upregulation of DIC uptake mechanisms in both S. latissima and Z. marina. Both species increased their ability to generate CO2 in the boundary layer by increasing external carbonic anhydrase and in Z. marina by also increasing proton extrusion and photosynthetic capacity. Changes in the xanthophyll-cycle in low-flow grown S. latissima increased non-photochemical quenching, thus reducing photodamage when photosynthesis was limited by DIC uptake. Water flow also affected root length in Z. marina but root length and below ground biomass were also significantly affected by sediment type, an indirect effect of water flow. 864265 bytes application/pdf en_US Acclimation of marine macrophytes (Saccharina latissima and Zostera marina) to water flow Thesis Biology, Plant Physiology carbonic anhydrase carbon uptake Zostera marina Saccharina latissma water flow open.access