Oregon Silverspot Butterfly Population Supplementation

Project #: 15504  –   Updated: October 22, 2010

Project Summary

In 1998 the Oregon zoo initiated a zoo rearing and release population supplementation program for the Oregon Silverspot butterfly. The Woodland Park Zoo joined the effort soon after. Adult females are received from the field (currently Mt. Hebo) each Fall. They are induced to lay eggs which are hatched and the larvae (caterpillars) are overwintered in refrigerators. The larvae are removed in the early summer and fed through six instars before release at sites on the coast. Several thousand are released each year.

The Oregon Zoo also participates in habitat restoration by raising and...

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Location (by county):
Lane County (OR), Tillamook County (OR)

Watersheds:
Wilson-Trusk-Nestuccu, Alsea, Siletz-Yaquina

Congressional Districts:
OR District 05, OR District 04

Bird Conservation Regions:
Northern Pacific Rainforest

USFWS Regions:
Pacific Region

Project size:
115.04 acres

Public Access

Site Name Publicly Accessible
Site 1 No
Site 3 No
Site 4 Yes
Site 5 Yes
Site 2 Yes

Full Project Description

In 1998 the Oregon zoo initiated a zoo rearing and release population supplementation program for the Oregon Silverspot butterfly. The Woodland Park Zoo joined the effort soon after. Adult females are received from the field (currently Mt. Hebo) each Fall. They are induced to lay eggs which are hatched and the larvae (caterpillars) are overwintered in refrigerators. The larvae are removed in the early summer and fed through six instars before release at sites on the coast. Several thousand are released each year.

The Oregon Zoo also participates in habitat restoration by raising and planting about 10,000 host plants (viola adunca) and nectar plants each fall.

A partnership with Lewis & Clark college has facilitated research on larvae behavior which has been applied to habitat restoration.

Project Assistance & Partnership Opportunities

Volunteers

Funding

Goals and Targets

Primary motivations:

Conservation Mission
Inspiring our community to create a better future for wildlife.

Primary goals:

Increase and sustain existing populations size and genetic health.
Progress:

Population size has increased to near pre-crash levels with population supplementation. No new populations have been established to date.

Consistent with plans:

Nature Conservancy Ecoregional Plan
State Wildlife Action Plan
Conservation Strategy Species
Species Recovery Plan
USFWS listed species

Targeted habitats:

    • Shrublands and Grasslands
      • Grasslands
        • Coastal and Valley Grassland

Targeted species were not provided for this project.

Actions

Project Actions
Reintroduce native species Show/Hide details

Assistance

Direct Funding
Oregon Department of Fish and Wildlife (Federal Government) Show/Hide details
USFWS (Federal Government) Show/Hide details

Outcomes

Is the success of this project's actions being monitored?   Yes

Please describe your monitoring activity.

TNC and USFWS partner to conduct annual population index counts and conduct habitat assessments.

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Organization

Oregon Zoo & Woodland Park Zoo
(Local Government)

Primary Contact

David Shepherdson  (Deputy Conservation Manager)
Oregon Zoo
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Partners

  • The Nature Conservancy
  • Newport Aquarium
  • Oregon Department of Forestry
  • Oregon Department of Fish and Wildlife
  • Lewis & Clark College
  • United States Fish and Wildlife Service
  • Siuslaw National Forest
  • Northwest Zoo & Aquarium Alliance

Project Photos

2007_osb_release_at_cc030_detail

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