Establishment from seed is more important for exotic than for native plant species

Climate change has initiated the movement of both native and non-native (exotic) species across the landscape.  Exotic species are hypothesized to establish from seed more readily than comparable native species.  We tested the hypothesis that seed limitation is more important for exotic species than native grassland species.  We compared seed limitation and invasion resistance over three growing seasons between 18 native and 18 exotic species, grown in both monocultures and mixtures in a field experiment.  Half of the plots received a seed mix of the contrasting treatment (i.e. exotic species were seeded into native plots, and native species were seeded into exotic plots), and half served as controls. We found that 1) establishment in this perennial grassland is seed limited, 2) establishment from seed is greater in exotic than native species, and 3) community resistance to seedling establishment was positively related diversity of extant species, but only in native communities.  Native..., Experiment established in 2008 compared all native vs. all exotic plant communities and monocultures, with and without summer irrigation (128 mm per year), called MEND (Maintenance of Exotic vs. Native Diversity).  In October 2016, a seed addition experiment was conducted on this experiment. Number of seedlings were measured in each plot (seeded and controls), number of plant species was recorded over time., , # Establishment from seed is more important for exotic than for native plant species

Four data sets, all csv files.

**CSV File Name - repeated_S_with19.csv.**

Block: October 2007, or March 2008 planting date

Column: Plot location on grid

Row: Plot location on grid

Origin: Native or Exotic

REP: Replicate

Irrig: Irrigated with 128 mm of water or 0 mm of water

Seed: Seeds added or not

draw: Replicate draw

S708: Richness in first week in July, 2008

S1008: Richness in October 2008

S609: Richness in June 2009

S1009: Richness in October 2009

S610: Richness in June 2010

S1010: Richness in October 2010

S1011: Richness in October 2011

S612: Richness in June 2012

S1012: Richness in October 2012

S613: Richness in June 2013

S1013: Richness in October 2013

S614: Richness in June 2014

S1014: Richness in October 2014

S615: Richness in June 2015

S1015: Richness in October 2015, when seed additions were made

S616: Richness in June 2016

S1016: Richness i...