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Rights Statements InC/1.0 , Open Access
Journal article
Factors affecting the success of California poppy (Eschscholzia californica) introduced into western Washington state
Northwest science., Vol.72(3), pp.180-189
1998
Handle:
https://hdl.handle.net/2376/1212
Abstract
California poppies (Eschscholzia californica), native to Californian grasslands, have been introduced to the south Puget Sound region and apparently persist along roadbanks and as volunteers in gardens, where the biomass of other vegetation is relatively low. Whether poppies can successfully invade other areas from these source populations may depend on the ability of poppies to withstand the abiotic environment and/or to compete with the established vegetation. To examine the potential for competition to limit California poppy success, I tested the effects of competition with perennial ryegrass (Lolium perenne), soil type, and wintering regime in a factorial experiment. Single poppy plants were grown outside in pots with from 0 to 32 ryegrass plants, either previously established or simultaneously seeded, in relatively dry or moist soil. Half these pots were harvested in the fall; the rest were overwintered outside or inside the greenhouse. Competition with established ryegrass prevented successful establishment of almost all poppy plants. Competition with simultaneously-seeded ryegrass caused mortality of poppy plants only at the highest densities; however, vegetative biomass, fruit number, and seed mass all decreased with increasing ryegrass biomass. Poppies were bigger and produced more fruits and seeds in moist soil, but soil type did not alter the intensity of competition. Poppy winter survival outside depended heavily on ryegrass competition from existing vegetation may relegate California poppies to sites where vegetation is sparse because of drought, low abundance; competition with ryegrass significantly decreased survival of the plants wintered outside. These results suggest that nutrients, or disturbance
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Details
- Title
- Factors affecting the success of California poppy (Eschscholzia californica) introduced into western Washington state
- Creators
- H. Elizabeth Kirkpatrick (Author)
- Publication Details
- Northwest science., Vol.72(3), pp.180-189
- Academic Unit
- Northwest Science
- Publisher
- WSU Press
- Identifiers
- 99900502143301842
- Copyright
- In copyright ; openAccess ; http://rightsstatements.org/vocab/InC/1.0/ ; http://purl.org/eprint/accessRights/OpenAccess
- Language
- English
- Resource Type
- Journal article