title: Effects of ulvoid (Ulva spp.) accumulation on the structure and function of eelgrass (Zostera marina L.) bed.
abstract: The objective of this study is to clarify the effect of ulvoid (Ulva spp.) accumulation on the structure and function of an eelgrass bed by the coast of Iwakuni, Seto Inland Sea, Japan. We monitored eelgrass shoot density and volume of ulvoid accumulation in the study site and evaluated effects of the accumulated ulvoid canopy on the percent survival, seedling density, growth rates, photosynthetic photon flux density (PPFD) and carbon contents of eelgrass. Eelgrass shoot density decreased by the accumulation of ulvoid. Also, seedling density decreased by the increase in the ulvoid volumes. Shoot density, seedling density and leaf elongation were negatively correlated with ulvoid volume. Carbon contents in eelgrass decreased by the accumulation of ulvoid (canopy height: 25cm). These results suggest that accumulation of ulvoid bloom has significant negative impacts on the structure and function of eelgrass bed, i.e. decreases in vegetative shoot density, seedling density, shoot height and growth rate.
authors: Hiroshima Environment and Health Association, 9-11, Hirosekitamachi Naka-ku, Hiroshima 730-8631, Japan. kenji.sugimoto@kanhokyo.or.jp
authors: Kenji
authors: K
authors: Sugimoto
authors: Kiyonori
authors: K
authors: Hiraoka
authors: Seiji
authors: S
authors: Ohta
authors: Yoko
authors: Y
authors: Niimura
authors: Toshinobu
authors: T
authors: Terawaki
authors: Mitsumasa
authors: M
authors: Okada
mesh_terms: D002244:Carbon / Q000032:analysis; D017753:Ecosystem; D007564:Japan; D010788:Photosynthesis / Q000502:physiology; D018515:Plant Leaves / Q000737:chemistry / Q000254:growth & development; D018517:Plant Roots / Q000737:chemistry; D018520:Plant Shoots / Q000502:physiology; D011156:Population Density; D027343:Rhizome / Q000737:chemistry; D016019:Survival Analysis; D044445:Ulva / Q000254:growth & development*; D035962:Zosteraceae / Q000502:physiology*
chemical_list: D002244:Carbon