PNW 98 Session - Full Abstracts
Full Abstract
1) Contact Author: Caren J. Crandell
2) Institution:University of Washington
3) Mailing Address: Center for Urban Horticulture, University of Washington, Box 354115, Seattle, WA 98195
4) Phone #:(206) 543-4426
5) Email: crandell@u.washington.edu
6) Presenter: Caren J. Crandell
7) Paper or Poster: poster
8) Equipment needs other than standard slide and overhead projector: easel
9) Contributed session 1st choice:Restoration
10) Contributed session 2nd choice:Wildlife
11) Do you want your oral or poster presentation judged for a student award (yes or no)?: Yes
12) Would you like to be a judge for Student Awards (yes or no)?:No
13) Keywords:grazing, Canada geese, wetland restoration
14) Authors:
15) Affiliation/institution:
(1) University of Washington
16) Abstract Title:
The effect of grazing by Canada geese on
_Carex lyngbyei_ at a restoration site in
the Duwamish River Estuary, Seattle,
Washington
17) Abstract Text:
Wetland restoration efforts in the Duwamish River Estuary and elsewhere have been thwarted by the grazing behavior of Canada geese (_Branta canadensis_). In 1995, _Carex lyngbyei_ (Cyperaceae), an intertidal sedge, was planted at a restoration site in the Duwamish River, Seattle, Washington. Sixty-eight percent of those plants protected with goose exclosures survived contrasted to 0% of those plants in the control (unprotected) group. The following year, 1-year-old plants were exposed to grazing by Canada goose populations naturally occurring in the area. Preliminary results indicate that grazing has a significant and negative impact on the fitness of 1-year-old _C. lyngbyei_ plants as measured by shoot density, standing crop (aboveground biomass), belowground biomass, and rhizome production. Implications for restoration efforts in areas where Canada geese occur include
1) the necessity of protecting newly planted shoots to ensure survival of some portion of the plants, and 2) the necessity of protecting plants for at least 2 years to allow them to develop to the degree that they can withstand some level of grazing pressure.
18) Comments/Requests:
I will need an easel for my poster only if there
is no other system for displaying them.