Abstract
Both abiotic and biotic factors govern distributions of estuarine vegetation, and experiments can reveal effects of these drivers under current and future conditions. In upper San Francisco Estuary (SFE), increased salinity could result from sea level rise, levee failure, or water management. We used mesocosms to test salinity effects on, as well as competition between, the native Stuckenia pectinata (sago pondweed) and invasive Egeria densa (Brazilian waterweed), species with overlapping distributions at the freshwater transition in SFE. Grown alone at a salinity of 5, E. densa decreased fivefold in biomass relative to the freshwater treatment and decomposed within 3 weeks at higher salinities. In contrast, S. pectinata biomass accumulated greatly (~4× initial) at salinities of 0 and 5, doubled at 10, and was unchanged at 15. When grown together in freshwater, S. pectinata produced 75 % less biomass than in monoculture and significantly more nodal roots (suggesting increased nutrient foraging). At a salinity of 5, a decline in E. densa performance coincided with a doubling of S. pectinata shoot density. Additional experiments on E. densa showed elevated temperature (26 and 30 °C) suppressed growth especially at higher salinities (≥5). We conclude that salinity strongly influences distributions of both species and that competition from E. densa may impose limits on S. pectinata abundance in the fresher reaches of SFE. With a salinity increase of 5, S. pectinata is likely to maintain its current distribution while spreading up-estuary at the expense of E. densa, especially if increased temperature also reduces E. densa biomass.






Similar content being viewed by others
References
Anderson LWJ., 1990. Aquatic weed problems and management in the western United States and Canada. In Pieterse AH, Murphy KJ, Aquatic weeds: the ecology and management of nuisance aquatic vegetation pp 371–pp 391. Oxford: Oxford University Press
Barko J.W., and M.R. Smart. 1981. Comparative influences of light and temperature on the growth and metabolism of selected submersed freshwater macrophytes. Ecological Monographs 51: 219–236.
Becerra, L. 2011. Egeria densa Control Program 2011 Report. State of California Department of Boating and Waterways. Retrieved November 15, 2013 from http://www.dbw.ca.gov/PDF/Reports/EDCP-2011_Annual_Report.pdf.
Borgnis, E. 2013. Predicting impacts of salinity and temperature on native and invasive submerged aquatic vegetation in the San Francisco Estuary. Master’s thesis, San Francisco State University, San Francisco.
Boyer K.E., J.T. Lewis, W.J. Thornton, and R.S. Schneider. 2012. San Francisco Bay expanded inventory of submerged aquatic vegetation. Maps: available at http://online.sfsu.edu/katboyer/Boyer_Lab/Pondweeds!.htmlFinal Report for National Oceanographic and Atmospheric Administration Southwest Fisheries.
Cloern J.E., and A.D. Jassby. 2012. Drivers of change in estuarine-coastal ecosystems: discoveries from four decades of study in San Francisco Bay. Reviews of Geophsyics 50: 397–430.
Cohen A.N., and J.T. Carlton. 1998. Accelerating invasion in a highly invaded estuary. Science 279: 555.
Connell J.H. 1972. Community interactions on marine rocky intertidal shores. Annual Review of Ecology and Systematics 3: 169–192.
Contra Costa Water District Water Resources. 2009. Historical freshwater and salinity conditions in the western Sacramento-San Joaquin Delta and Suisun Bay. Retrieved November 27th, 2013 from http://www.ccwater.com/salinity/HistoricSalinityhighlights.pdf.
Crain C.M., B.R. Silliman, S.L. Bertness, and M.D. Bertness. 2004. Physical and biotic drivers of plant distribution across estuarine salinity gradients. Ecology 85: 2539–2549.
Dunson W.A., and J. Travis. 1991. The role of abiotic factors in community organization. The American Naturalist 5: 1067–1091.
Enright C., and S.D. Culberson. 2009. Salinity trends, variability, and control in the northern reach of the San Francisco Estuary. San Francisco Estuary and Watershed Science 7: 1–29.
Gibson D.J., J. J. Connolly, D.C. Bartnett, and D. Weidenhamer. 1999. Designs for greenhouse studies of interactions between plants. Journal of Ecology 87: 1–16.
Hall L.W., R.D. Anderson, and M.S. Ailstock. 1997. Chronic toxicity of atrazine to sago pondweed at a range of salinities: implications for criteria development and ecological risk. Environmental Contamination and Toxicology 33: 261–267.
Haramoto T., and I. Ikusima. 1988. Life cycle of Egeria densa Planch., an aquatic plant naturalized in Japan. Aquatic Botany 30: 389–403.
Harper J.L. 1977. Population biology of plants. Population biology of plants.
Hauenstein E., and C. Ramirez. 1986. The influence of salinity on the distribution of Egeria densa in the Valdivia river basin, Chile. Arch. Hydrobiol 107: 511–519.
Hershner C., and K.J. Havens. 2008. Managing invasive aquatic plants in a changing system: strategic consideration of ecosystem services. Conservation Biology 22: 544–550.
Hofstra D.E., J. Clayton, J.D. Green, and M. Auger. 1999. Competitive performance of Hydrilla verticillata in New Zealand. Aquatic Botany 63: 305–324.
Hussner A., and R. Lösch. 2005. Alien aquatic plants in a thermally abnormal river and their assembly to neophyte-dominated macrophyte stands. Limnologica 35: 18–30.
Jackson M.B. 1990. Hormones and developmental-change in plants subjected to submergence or soil waterlogging. Aquatic Botany 38: 49–72.
Jiang Z., J. Liu, J. Chen, Q. Chen, X. Yan, J. Xuan, and J. Zeng. 2014. Responses of summer phytoplankton community to drastic environmental changes in the Changjiang (Yangtze River) estuary during the past 50 years. Water Research 54: 1–11.
Johnson, D., M. Carlock., and T. Artz 2006. Egeria densa Control Program second addendum to 2001 Environmental Impact Report with five-year program review and future operations plan. State of California Department of Boating and Waterways Open-File Report.
Kaplan Z. 2002. Phenotypic plasticity in Potamogeton (Potamogetonaceae). Folia Geobontanica 37: 141–170.
Keddy P., L.H. Fraser, and I.C. Wisheu. 1998. A comparative approach to examine competitive response of 48 wetland plant species. Journal of Vegetation Science 9: 777–786.
Kimmerer W.J. 2002. Physical, biological, and management responses to variable freshwater flow into the San Francisco Estuary. Estuaries 25: 1275–1290.
Knowles N., and D.R. Cayan. 2002. Potential effects of global warming on the Sacramento/San Joaquin watershed and the San Francisco estuary. Geophysical Research Letters 29: 1891.
Lund J., E. Hanak, W. Fleenor, R. Howitt, J. Mount, and P. Moyle. 2007. Envisioning futures for the Sacramento-San Joaquin Delta. San Francisco: Public Policy Institute.
Marin H.H., A. Tironi, L.E. Delgado, M. Contreras, F. Novoa, M. Torres-Gomez, R. Garreaud, I. Vila, and I. Serey. 2009. On the sudden disappearance of Egeria densa from a Ramsar wetland site of southern Chile: a climatic event trigger model. Ecological Modelling 220: 1752–1763.
McCollough C.D. 1997. A review of the aquatic macrophyte family Hydrochartitaceae (Agiospermae) in New Zealand. Tane 26: 181–195.
McGowan M., and A. Marchi. 1998. Fishes collected in submerged aquatic vegetation, Egeria densa in the delta. Interagency Ecological Program Newsletter 11: 9–11.
Najjar R.G., C.R. Pyke, M.B. Adams, D. Breitburg, C. Hershner, M. Kemp, R. Howarth, M.R. Mulholland, M. Paolisso, D. Secor, K. Seliner, D. Wardrop, and R. Wood. 2010. Potential climate-change impacts on the Chesapeake Bay. Estuarine, Coastal and Shelf Science 86: 1–20.
Nichols F.H., J.E. Cloern, S.N. Luoma, and D.H. Peterson. 1986. The modification of an estuary. Science 231: 567–573.
Nobriga M., F. Feyrer, R. Baxter, and M. Chotkowski. 2005. Fish community ecology in an altered river delta: spatial patterns in species composition, life history strategies, and biomass. Estuaries 28: 776–785.
Odum W.E. 1988. Comparative ecology of tidal freshwater and salt marshes. Annual Review of Ecology and Systematics 19: 147–176.
Paine R.T. 1974. Intertidal community structure. Oceologia 15: 93–120.
Pilon J., and L. Santamaria. 2002. Clonal variation in the thermal response of the submerged aquatic macrophyte Potamogeton pectinatus. Journal of Ecology 90: 141–152.
Purer E.A. 1942. Plant ecology of the coastal salt marshlands of San Diego County, California. Ecological Monographs 12: 81–111.
Riis T., C. Lambertini, B. Olesen, J.S. Clayton, H. Brix, and B.K. Sorrell. 2010. Invasion strategies in clonal aquatic plants: are phenotypic differences cased by phenotypic plasticity or local adaptation?. Annals of Botany 106: 813–822.
Rybicki N.B., D.G. McFarland, H.A. Ruhl, J.T. Reel, and J.W. Barko. 2001. Investigations of the availability and survival of submersed aquatic vegetation propagules in the tidal Potomac River. Estuaries 24: 407–424.
Santos M.J., W.A. Lars, and S.L. Ustin. 2011. Effects of invasive species on plant communities: an example using submersed aquatic plants at the regional scale. Biological Invasions 13: 443–457.
Scavia D., J.C. Field, D.F. Boesch, R.W. Buddemeier, V. Burkett, D.R. Cayan, M. Fogarty, M.A. Harwell, R.W. Howarth, C. Mason, D.J. Reed, T.C. Royer, A.H. Sallenger, and J.C. Titus. 2002. Climate change impacts on U.S. coastal and marine ecosystems. Estuaries 25: 149–164.
Sen P.K. 1968. Estimates of the regression coefficient based on Kendall’s tau. Journal of the American Statistical Association 63: 1379–1389.
Spencer D.F., and L.W.J. Anderson. 1986. Influence of photoperiod on growth, pigment composition and vegetative propagule formation for Potamogeton nodosus Poir. and Potamogeton pectinatus L. Aquatic Botany 28: 103–112.
Summers J.E., and M.B. Jackson. 1998. Light- and dark-grown Potamogeton pectinatus, an aquatic macrophyte, make no ethylene (ethane) but retain responsiveness to the gas. Australian Journal of Plant Physiology 25: 599–608.
Thiebaut G. 2007. Invasion success of non-indigenous aquatic and semi-aquatic plants in their native and introduced ranges. A comparison between their invasiveness in North America and France. Biological Invasions 9: 1–12.
Teeter J.W. 1965. Effects of sodium chloride on sago pondweed. The Journal of Wildlife Management 29: 838–845.
Titus J.G., R.A. Park, and S.P. Leatherman. 1991. Greenhouse effect and sea level rise: the cost of holding back the sea. Coastal Management 19: 171–204.
Triest L., V. Tran Thi, D. Le Thi, T. Sierens, and A. Van Geert. 2010. Genetic differentiation of submerged plant populations and taxa between habitats. Hydrobiologia 656: 15–27.
Vanderstukken M., N. Mazzeo, W. Van Colen, S. Declerck, and K. Muylaert. 2011. Biological control of phytoplankton by the subtropical submerged macrophytes Egeria densa and Potamogeton illineonsis: a mesocosm study. Freshwater Biology 56: 1837–1849.
Van Wijk R.J. 1988. Ecological studies on Potamogeton pectinatus L. I. General characteristics, biomass production and life cycles under field conditions. Aquatic Botany 31: 211–258.
Van Zandt P.A., M.A. Tobler, E. Mouton, K.H. Hasenstein, and S. Mopper. 2003. Positive and negative consequences of salinity stress for the growth and reproduction of the clonal plant, Iris hexagona. Journal of Ecology 91: 837–846.
Vitousek P.M., C.M. D’Antonio, L. Loope, M. Rejmanek, and R. Westbrooks. 1997. Introduced species: a significant component of human-caused global change. New Zealand Ecological Society 21: 1–16.
Wagner W.R., W. Stacey, L.R. Brown, and M. Dettinger. 2011. Statistical models of temperature in the Sacramento-San Joaquin Delta under climate-change scenarios and ecological implications. Estuaries and Coasts 34: 544–556.
Walther G., E. Post, P. Convey, A. Menzel, C. Parmasean, T. Beebee, J. Fromentin, O. Hoegh-Guldberg, and F. Bairlein. 2002. Ecological responses to recent climate change. Nature 416: 389–395.
Water Resources Department 2010. Historical fresh water and salinity conditions in the western Sacramento-San Joaquin Delta and Suisun Bay. Contra Costa Water District, Technical Memorandum WR10-001.
Wells R.D.S., M.D. de Winton, and J.S. Clayton. 1997. Successive macrophyte invasions within the submerged flora of Lake Tarawera, Central North Island, New Zealand. N Z J Marine Freshwater Resource 31: 449–459.
Wersal R.M., J.D. Madsen, B.R. McMillan, and P.D. Gerard. 2006. Environmental factors affecting biomass and distribution of S. pectinata in the Heron Lake System, Minnesota, USA. Wetlands 26: 313–321.
Wilkerson F.P., R.C. Dugdale, V.R. Hogue, and A. Marchi. 2006. Phytoplankton blooms and nitrogen productivity in San Francisco Bay. Estuaries and Coasts 29: 401–416.
Acknowledgments
Chris Raleigh, Jen Miller, and David Bell provided assistance with water quality monitoring and plant collections. We are grateful for the help with mesocosm experiment setup at the Romberg Tiburon Center by facility staff, especially John Rattana and Scott Kern. Jen Miller, Ace Crow, Rachel Cantor, and Serina Sebilian provided assistance with mesocosm experiment maintenance and data collection. This project was supported by grants to KEB from the CALFED Ecosystem Restoration Program/CA Department of Fish and Wildlife, the Delta Science Program, and the NOAA National Marine Fisheries Service. The Romberg Tiburon Center, Society of Wetland Scientists, Coastal and Estuarine Research Federation, San Francisco State University, and California State University’s Council on Ocean Affairs, Science, and Technology provided additional funding to E. Borgnis.
Author information
Authors and Affiliations
Corresponding authors
Additional information
Communicated by Richard C. Zimmerman
Rights and permissions
About this article
Cite this article
Borgnis, E., Boyer, K.E. Salinity Tolerance and Competition Drive Distributions of Native and Invasive Submerged Aquatic Vegetation in the Upper San Francisco Estuary. Estuaries and Coasts 39, 707–717 (2016). https://doi.org/10.1007/s12237-015-0033-5
Received:
Revised:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s12237-015-0033-5