Determining appropriate management techniques for Willamette ...

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ERDE Management Progress Report, 2012 Demography and Management of Willamette Daisy (Erigeron decumbens) Table 1. Table of the number of plants, survivorship and flowering plants at each site. Data collected July 2011 (approximately 3 months after outplanting) and June 2012. Corvallis West Finley Eugene West Fern Ridge Field 8 Field 29 Applegate Kirk Number outplanted in 2011 450 450 360 356 2011 Number (%) survival 426 (94.7%) 428 (95.1%) 342 (95.0%) 327 (91.9%) 2011 Number flowering 2 6 1 0 2011 Average size (cm 2 ) 67 81 31 45 2012 Number (%) survival (2011-2012) 347 (81.4%) 365 (85.2%) 144 (42.1%) 198 (60.5%) 2012 Number flowering 195 (56.2%) 240 (65.8%) 60 (41.7%) 86 (43.4%) 2012 Average size (cm 2 ) 249 239 158 211 Treatment Effects on Willamette Daisy Survivorship Survivorship varied by site, however there were no significant treatment effects on the survivorship of Willamette daisy. In the Eugene West Recovery Zone, survivorship ranged from 32-72% and in the Corvallis West from 63-94%. The lack of treatment effects on survival of Willamette daisy can be interpreted as an indication that though endangered, Willamette daisy can handle aggressive management treatments without any significant detrimental effects. Monitoring in 2013-2015 will track longer term effects on the daisies that may not yet be evident. Additionally, burning did not occur at the Eugene West sites until the fall of 2012 so the effects of Burn + Glyphosate treatment in the Eugene West Recovery Zone are still unknown. 8
ERDE Management Progress Report, 2012 Demography and Management of Willamette Daisy (Erigeron decumbens) Figure 6. Percent survivorship from 2011-2012 at the Eugene West and Corvallis West Recovery Zones. Survivorship was higher overall at the Corvallis West sites. There was not a significant effect of treatment on survival. Reproductive Success Initial monitoring in 2012 indicates that only one treatment at one site had a significant effect on the reproductive success of Willamette daisy: the Burn + Glyphosate treatment at Finely, Field 29 (Corvallis West Recovery Zone), had significantly more flowers than the control (Figure 6). 9
Page 1 and 2: Demography and Management of Willam
Page 3 and 4: ERDE Management Progress Report, 20
Page 13: ERDE Management Progress Report, 20
Page 21 and 22: Mowing ERDE Management Progress Rep
Page 23 and 24: Status reporting ‘13 -‘14 Phase
Page 35 and 36: Macroplot design at Applegate, Fern
Page 37 and 38: Macroplot design at Kirk East, Fern
Page 39: Layout of blocks and treatment plot

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