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If you have any questions on the information presented, or require additional report data or attachments, please contact the
Ministry.
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A comprehensive list of native plant species known to naturally colonize the upper drawdown zone of the
Williston reservoir was developed. The list was created based on personal observations of drawdown zone
vegetation in the reservoir and from plant species lists developed from vegetation surveys as part of
previous BC Hydro vegetation monitoring projects.
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Author: DWB Colsulting Services Ltd.
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Old Reference Number: PEA-F17-W-1306
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Old Reference System: FWCP - Fish Wildlife Compensation Program Peace
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Date Published: Jan 2017
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Report ID: 52337
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Audience: Government and Public
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The initial stage of this project outline in this report had two objectives. The first objective was to identify
candidate flood and drought tolerant native plant species for use in the revegetation of the upper
drawdown zone in the Williston Reservoir. Candidate species were selected from a comprehensive list of
plant species known to naturally colonize the drawdown zone. The second was to assess the potential to
collect seed and propagate seedlings for each of the candidate species. Identifying candidate species and
assessing the potential for seed collection and propagation was conducted using relevant literature and
discussions with native plant seed collectors and propagation experts, revegetation specialists and local
First Nations. These objectives have been developed to support action 2a- of BC Hydros Peace Basin
Riparian and Wetlands Action Plan, which aims to identify flood and drought resistant plant species for
bank stabilization.
A comprehensive list of native plant species known to naturally colonize the upper drawdown zone of the
Williston reservoir was developed. The list was created based on personal observations of drawdown zone
vegetation in the reservoir and from plant species lists developed from vegetation surveys as part of
previous BC Hydro vegetation monitoring projects. Candidate species were selected through a process of
elimination. The process used specific criteria to eliminate species that were either unlikely to tolerate
growing conditions in the upper drawdown zone or were identified as challenging to propagate. To help
further refine the list of candidate plant species, feedback was solicited from select professionals
experienced in the practice of revegetation, native seed collection and nursery propagation as well as with
aboriginal traditional knowledge holders. In addition, an preliminary review of factors related to seed
collection and propagation of seedlings for each of the candidate species was completed utilizing
information from previous revegetation trials, recommendations from relevant literature and feedback
from native plant nurseries.
A total of ten species were identified as candidates for revegetation of the drawdown zone. They include
bluejoint (Calamagrostis Canadensis), common spike-rush (Eleocharis palustris), common horsetail
(Equisetum arvense), swamp horsetail (Equisetum fluviatile), dwarf scouring-rush (Equisetum scirpoides),
lakeshore sedge (Carex lenticularis), water sedge (Carex aquatilis), water smartweed (Persicaria
amphibia), willow (Salix spp.) and hardhack (Spiraea douglasii).
A preliminary review of information in regards to plant propagule collection and propagation for the
candidate species identified some considerations for future efforts. Propagule collection would include
collecting seed or rhizomes; timing for seed collection would be specific (early summer to autumn)
whereas timing for rhizomes for propagation would likely be the most appropriate in the early spring. In
regards to propagation approaches, much of the details of these approaches remain propriety to plant
nurseries and thus details collected are limited.
Future work for this project will work towards the establishment and monitoring of revegetation trials in
the upper drawdown zone of Williston Reservoir. The work will be completed in stages, each building on
the success of the previous stage. Following this initial stage, in which candidate species have been
identified, stage two of the project will aim to collect and/or acquire propagules for each species and
initiate seedling propagation with a native plant nursery. Stage three of the project work towards the
design and implementation of planting trials at a few select locations in the reservoir. Monitoring of the
planting trials will follow with further stages.
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Report Type
Subject
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Region - Peace |
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Vegetation - Plant Ecology |
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