Abstract
Playas undergo dynamic environmental changes throughout the growing season, resulting in the need for a persistent seed bank for plants to respond to these changes. Therefore, we investigated seasonal germination patterns of species found in seed banks of playa wetlands. We used the seedling-emergence technique to determine recruitment patterns from seed banks of eight playas. In the greenhouse, seed-bank samples were subjected to two treatments, drawdown or flooded, over a 210-day duration divided into seven 30-day time periods. In both treatments, seedling emergence differed among time periods and species but was similar among playas. Approximately 52% of drawdown seedlings and 44% of seedlings occuring in the flooded treatment germinated in the first 30 days. Plants occuring in playa seed banks had variable germination strategies. Three patterns for common (>5% occurrence) species were identified in the drawdown treatment: (1) early germinators (those species that germinated rapidly after exposure to treatments with low germination during the remainder of time periods), (2) late germinators (those that germinate after specific environmental conditions have existed for some time), and (3) continous germinators (those with even germination rates throughout submersion). Two patterns were found for common species in the flooded treatment: (1) early germinators and (2) continuous germinators. Germination throughout the period of suitable environmental conditions was the dominant strategy for persistence in the unpredictable playa environment. With only a few exceptions, species persisting in seed banks of playas do not show germination for all available seeds upon creation of suitable environmental conditions but rather use viable dormant seeds as a hedge against the unpredictable environment.
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Literature cited
Baskin, J. M. and C. C. Baskin. 1985. The annual dormancy cycle in buried weed seeds: a continuum. BioScience 35:492–498.
Bliss, S. A. and P. H. Zedler. 1998. The germination process in vernal pools: sensitivity to environmental structure conditions and effects on community structure. Oecologia 113:67–73.
Brock, M. A. and M. T. Casanova. 1997. Plant life at the edge of wetlands: ecological responses to wetting and drying patterns. p. 181–192. In N. Klomp and I. Lunt (eds.) Frontiers in Ecology: Building the Links. Elsevier Science, Oxford, England.
Correll, D. S. and M. C. Johnston. 1979. Manual of the Vascular Plants of Texas. University of Texas at Dallas Press, Richardson, TX, USA.
Freas, K. E. and P. R. Kemp. 1983. Some relationships between environmental reliability and seed dormancy in desert annual plants. Journal of Ecology 71:211–217.
Godfrey, R. K. and J. W. Wooten. 1981. Aquatic Plants of Southeastern United States: Dicotyledons. University of Georgia Press. Athens, GA, USA.
Haag, R. W. 1983. Emergence of seedlings of aquatic macrophytes from lake sediments. Canadian Journal of Botany 61:148–156.
Harris, R. J. 1975. A Primer of Multivariate Statistics. Academic Press, New York, NY, USA.
Haukos, D. A. and L. M. Smith. 1993. Seed bank composition and predictive ability of field vegetation in playa lakes. Wetlands 13: 32–40.
Haukos, D. A. and L. M. Smith. 1994. The importance of playa wetlands to biodiversity of the Southern High Plains. Landscape and Urban Planning 28:83–98.
Haukos, D. A. and L. M. Smith. 1997. Common Flora of Playa Lakes. Texas Tech University Press. Lubbock, TX, USA.
Leck, M. A. and R. L. Simpson. 1987. Seed bank of a freshwater tidal wetland: turnover and relationship to vegetation change. American Journal of Botany 74:360–370.
Leck, M. A. and R. L. Simpson. 1995. Ten-year seed bank and vegetation dynamics of a tidal freshwater marsh. American Journal of Botany 82:1547–1557.
Luo, H. R., L. M. Smith, B. L. Allen, and D. A. Haukos. 1997. Effects of sedimentation on playa wetland volume. Ecological Applications 7:247–252.
Luo, H. R., L. M. Smith, D. A. Haukos, and B. L. Allen. 1999. Sources of recently deposited sediments in playa wetlands. Wetlands 19:176–181.
Neitsch, C. L. and D. A. Blackstock. 1978. Soil Survey of Floyd County, Texas. U.S. Department of Agriculture Report, U.S. Government Printing Office, Washington, DC, USA.
Pederson, R. L. 1983. Abundance, distribution, and diversity of buried seed populations in the Delta Marsh, Manitoba, Canada. Ph. D. Dissertation. Iowa State University, Ames, IA, USA.
Pederson, R. L. and L. M. Smith. 1988. Implications of wetland seed bank research: a review of Great Basin and prairie marsh studies. p. 81–95. In D. A. Wilcox (ed.) Interdisciplinary Approaches to Freshwater Wetlands Research. Michigan State University Press, East Lansing, MI, USA.
Poiani, K. A. and W. C. Johnson. 1988. Evaluation of the emergence method in estimating seed bank composition of prairie wetlands. Aquatic Botany 32:91–97.
Rosenzweig, M. L. 1996. Species Diversity in Space and Time Cambridge University Press, New York, NY, USA.
Smith, L. M. 1990. Waterfowl habitat management and research in North America. International Union of Game Biologists Congress 19:468–476.
Smith, L. M. and J. A. Kadlec. 1983. Seed banks and their role during drawdown of a North American marsh. Journal of Applied Ecology 20:673–684.
Smith, L. M. and J. A. Kadlec. 1985. The effects of disturbance on marsh seed banks. Canadian Journal of Botany 63:2133–2137.
van der Valk, A. G. and C. B. Davis. 1978. The role of seed banks in the vegetation dynamics of prairie glacial marshes. Ecology 59: 322–335.
Welling, C. H., R. L. Pederson, and A. G. van der Valk. 1988. Temporal patterns in recuitment from the seed bank during drawdowns in a prairie wetland. Journal of Applied Ecology 25:999–1007.
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Haukos, D.A., Smith, L.M. Temporal emergence patterns of seedlings from playa wetlands. Wetlands 21, 274–280 (2001). https://doi.org/10.1672/0277-5212(2001)021[0274:TEPOSF]2.0.CO;2
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DOI: https://doi.org/10.1672/0277-5212(2001)021[0274:TEPOSF]2.0.CO;2