The role of large rhizome dispersal and low salinity windows in the establishment of common reed,Phragmites australis, in salt marshes: New links to human activities

In spite of its long history,Phragmites australis’ (Cav.) Trin ex Stuedel invasion in tidal marshes defies explanation. Initial establishment in these systems is particularly perplexing, because seedlings and rhizome fragments do not perform well in poorly drained saline environments. We tested the possibility that dispersal and burial of large rhizomes, periods of low salinity, and localized, well-drained areas facilitate initial establishment in brackish marshes. In a greenhouse we exposed large and small rhizomes to two drainage treatments: mimics of poorly-drained, high marsh interiors and mimics of well-drained, mosquito ditch banks. In well-drained treatments we exposed rhizomes to one of three salinity treatments: fresh, natural salinity regime of an invaded brackish water marsh, and a 2-wk freshwater window followed by a natural salinity regime. Small rhizone fragments did not emerge in saline treatments or treatments with high water tables, while emergence was spotty in well-drained freshwater treatments. Large rhizomes emerged only in well-drained, treatments. For large rhizomes, growth, survival, and clonal spread decreased when exposed to the natural salinity regime, but improved with exposure to the 2-wk freshwater window. These results suggest that dispersal and burial of larger rhizomes, well-drained features, and low salinity windows following dispersal improve the chances of successful establishment. These results help explain case-specific historical links between establishment and such human activities as hydrological alterations, construction activities, and lowered salinity.

[1]  J. Lissner,et al.  Effects of salinity on the growth of Phragmites australis , 1997 .

[2]  W. Niering,et al.  Salt marsh vegetation change in response to tidal restriction , 1984 .

[3]  K. Saltonstall,et al.  EXPANSION OF PHRAGMITES AUSTRALIS INTO TIDAL WETLANDS OF NORTH AMERICA , 1999 .

[4]  P. Bushmann,et al.  Common Reed Phragmites australis: Control and Effects Upon Biodiversity in Freshwater Nontidal Wetlands , 2001 .

[5]  R. Brändle.  Kohlehydratgehalte und Vitalität isolierter Rhizome von Phragmites australis, Schoenoplectus lacustris und Typha latifolia nach mehrwöchigem O2-Mangelstreß , 1985 .

[6]  K. Saltonstall,et al.  Cryptic invasion by a non-native genotype of the common reed, Phragmites australis, into North America , 2002, Proceedings of the National Academy of Sciences of the United States of America.

[7]  K. Vogt,et al.  Linking the Success of Phragmites to the Alteration of Ecosystem Nutrient Cycles , 2002 .

[8]  T. J. Headlee.  The Mosquitoes of New Jersey and their Control. , 1945 .

[9]  S. Shumway.  Physiological Integration among Clonal Ramets during Invasion of Disturbance Patches in a New England Salt Marsh , 1995 .

[10]  R. Lathrop,et al.  Effects of Phragmites australis (common reed) invasion on aboveground biomass and soil properties in brackish tidal marsh of the Mullica river, New Jersey , 1999 .

[11]  M. Bertness,et al.  Anthropogenic modification of New England salt marsh landscapes , 2002, Proceedings of the National Academy of Sciences of the United States of America.

[12]  J. Adams,et al.  Growth and photosynthetic performance of Phragmites australis in estuarine waters: a field and experimental evaluation , 1999 .

[13]  David M. Burdick,et al.  Variation in soil salinity associated with expansion of Phragmites australis in salt marshes , 2001 .

[14]  R. Crawford,et al.  Plant Growth and Survival under Strict Anaerobiosis , 1982 .

[15]  J. C. Ambrose,et al.  EFFECTS OF SALINITY AND SULFIDE ON THE DISTRIBUTION OF PHRAGMITES AUSTRALIS AND SPARTINA ALTERNIFLORA IN A TIDAL SALTMARSH , 1998 .

[16]  R. Lathrop,et al.  DoesPhragmites expansion alter the structure and function of marsh landscapes? Patterns and processes revisited , 2003 .

[17]  Kathleen Agosta.  The effect of tidally induced changes in the creekbank water table on pore water chemistry , 1985 .

[18]  J. L. Gallagher,et al.  Effect of oxygen availability and salinity on early life history stages of salt marsh plants. II. Early seedling development advantage of Spartina alterniflora over Phragmites australis (Poaceae) , 1996 .

[19]  R. Crawford,et al.  Rhizome anoxia tolerance and habitat specialization in wetland plants , 1987 .

[20]  W. Nuttle.  The extent of lateral water movement in the sediments of a New England Salt Marsh , 1988 .

[21]  H. Rolletschek,et al.  Effects of NaCl-salinity on amino acid and carbohydrate contents of Phragmites australis , 2001 .

[22]  Wim H. van der Putten,et al.  Die-back of Phragmites australis in European wetlands: an overview of the European Research Programme on Reed Die-back and Progression (1993–1994) , 1997 .

[23]  H. Hemond,et al.  Subsurface flow in salt marsh peat: A model and field study1 , 1982 .

[24]  E. Takahashi,et al.  Salt tolerance of the reed plant Phragmites communis , 1988 .

[25]  Barbara E. M. Keller.  Genetic variation among and within populations of Phragmites australis in the Charles River watershed , 2000 .

[26]  J. L. Gallagher,et al.  The effects of salinity and flooding on Phragmites australis , 1992 .

[27]  F. Montalto,et al.  Phragmites australis invasion and expansion in tidal wetlands: Interactions among salinity, sulfide, and hydrology , 2003 .

[28]  M. Bertness,et al.  CLONAL INTEGRATION AND THE EXPANSION OF PHRAGMITES AUSTRALIS , 2000 .

[29]  J. Hartman,et al.  Environmental determinants of Phragmites australis expansion in a New Jersey salt marsh : an experimental approach , 2000 .

[30]  W. Nuttle,et al.  Salt marsh hydrology: Implications for biogeochemical fluxes to the atmosphere and estuaries , 1988 .

[31]  A. Mauchamp,et al.  Salt tolerance in Phragmites australis populations from coastal Mediterranean marshes , 2001 .

[32]  R. Gerdol,et al.  Reed (Phragmites australis) decline in a brackish wetland in Italy. , 2002, Marine environmental research.

[33]  J. Parlange,et al.  The restoration of tidal marsh hydrology , 2002 .

[34]  J. L. Gallagher,et al.  Effect of oxygen availability and salinity on EARLY LIFE HISTORY STAGES OF SALT MARSH PLANTS. I. Different germination strategies of Spartina alterniflora and Phragmites australis (Poaceae) , 1996 .

[35]  D. Burdick,et al.  Determinants of expansion forPhragmites australis, common reed, in natural and impacted coastal marshes , 2003 .

[36]  J. Grimsby,et al.  Rates, patterns, and impacts ofPhragmites australis expansion and effects of experimentalPhragmites control on vegetation, macroinvertebrates, and fish within tidelands of the lower Connecticut River , 2001 .

[37]  M. Weinstein,et al.  Does the common reed,Phragmites australis, affect essential fish habitat? , 1999 .

[38]  W. Armstrong,et al.  Phragmites die-back: sulphide- and acetic acid-induced bud and root death, lignifications, and blockages within aeration and vascular systems. , 1996, The New phytologist.