Proceedings of the Third International Conference on Invasive ...

Chapter 2: Spartina Distribution and Spread<strong>Proceedings</strong> <strong>of</strong> <strong>the</strong> <strong>Third</strong> <strong>International</strong> <strong>Conference</strong> on Invasive SpartinaFig.1: Percent seed set vs. %germination <strong>of</strong> self-fertilizedhybrid seeds from CogswellMarsh, Hayward. Averagegermination/seed set rates for selffertilizedS. foliosa and S.alterniflora are 25%/12% and45%/25% respectively. HybridC3-1 represents a transgressiveindividual exceeding both parentsand o<strong>the</strong>r hybrids in germinationand seed set <strong>of</strong> self-fertilized seed.Fig. 2: Temporal variationin seedling recruitment atHayward shoreline.Distribution <strong>of</strong> seedlingsin Spring 2004 (stars)increased >500-fold fromSpring 2003 (triangles).Overlap <strong>of</strong> stars andtriangles suggests survival<strong>of</strong> 2003 seedlings.-96-