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MetaData for 2006 Oregon Chub Investigations Progress Reports 2006
2006 Oregon Chub Investigations Progress Reports 2006
Identification Information
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Citation
- Originator: Scheerer, P.D., P.S. Kavanagh, B.L. Bangs and S. E. Jacobs
- Publish Date: 2007
- Online Link: None
- BPA Project #:
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Contact Information
- Agency: Oregon Department of Fish and Wildlife
- Name: Cedric Cooney
- Job Position: Natural Resources Data and Systems Manager
- Telephone: 503-947-6094
- E-Mail Address: cedric.x.cooney@odfw.oregon.gov
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Description
- Abstract: Oregon chub Oregonichthys crameri, small minnows endemic to the Willamette Valley,
were federally listed as endangered under the Endangered Species Act in 1993. Factors
implicated in the decline of this species include changes in flow regimes and habitat
characteristics resulting from the construction of flood control dams, revetments, channelization,
diking, and the drainage of wetlands. The Oregon chub is further threatened by predation and
competition by non-native species such as largemouth bass Micropterus salmoides, crappies
Pomoxis sp., sunfishes Lepomis sp., bullheads Ameiurus sp., and western mosquitofish
Gambusia affinis. We continued surveys initiated in 1991 in the Willamette River drainage to
quantify the abundance of known Oregon chub populations, search for unknown populations,
evaluate potential introduction sites, and monitor introduced populations as part of the
implementation of the Oregon Chub Recovery Plan.
We sampled a total of 103 sites in 2006. No new populations of Oregon chub were
discovered. Thirty-five of the 103 sites were new locations that were sampled for the first time
in 2006. Sixty-eight sites, sampled on at least one occasion between 1991-2005, were
revisited.
We confirmed the continued existence of Oregon chub at 33 locations. These included
23 naturally occurring and 10 introduced populations. Locations of naturally occurring
populations were: Santiam drainage (Geren Island, Santiam I-5 Side Channels, Santiam
Conservation Easement, Stayton Public Works Pond, Green’s Bridge Backwater, Pioneer Park,
Santiam Conservation Easement, and Gray Slough), Mid-Willamette drainage (Finley Gray
Creek Swamp), McKenzie drainage (Shetzline Pond and Big Island), Coast Fork Willamette
drainage (Coast Fork Side Channels and Lynx Hollow), and the Middle Fork Willamette
drainage (two Dexter Reservoir alcoves, East Fork Minnow Creek Pond, Shady Dell Pond,
Buckhead Creek, two Elijah Bristow State Park sloughs and an island pond, Barnhard Slough,
and Hospital Pond). Introduced populations were located in the Middle Fork Willamette
(Wicopee Pond and Fall Creek Spillway Ponds), Santiam (Foster Pullout Pond), McKenzie
(Russell Pond), Coast Fork Willamette (Herman Pond), and Mid-Willamette drainages (Dunn
Wetland, Finley Display Pond, Finley Cheadle Pond, Ankeny Willow Marsh, and Jampolsky
Wetlands).
We did not find Oregon chub at 14 locations where they were collected on at least one
occasion between 1991-2005 (Jasper Park Slough, Wallace Slough, East Ferrin Pond, Dexter
East Alcove, Hospital Impoundment Pond, Rattlesnake Creek, Elijah Bristow Large Gravel Pit,
Elijah Bristow Small Gravel Pit, Little Muddy Creek tributary, Bull Run Creek, Camas Swale,
Barnhard Slough, Camous Creek, and Dry Muddy Creek). Nonnative fish were collected at
most of these locations.
We obtained abundance estimates of naturally occurring populations of Oregon chub at
18 locations in the Middle Fork Willamette (East Fork Minnow Creek Pond, Shady Dell Pond,
Elijah Bristow State Park Sloughs and Island Pond, Hospital Pond, Dexter Reservoir Alcoves,
Haws Pond, and Buckhead Creek), Santiam (Geren Island, Gray Slough, Stayton Public Works
Pond, Pioneer Park Pond, and Santiam I-5 Side Channels), McKenzie (Big Island and Shetzline
Pond), and Mid-Willamette drainages (Finley Gray Creek) (Table 1).
We obtained abundance estimates for 10 introduced populations of Oregon chub,
located in Fall Creek Spillway Ponds, Wicopee Pond, Dunn Wetland Ponds, Finley Display
Pond, Finley Cheadle Pond, Ankeny Willow Marsh, Jampolsky Wetlands, Foster Pullout Pond,
Herman Pond, and Russell Pond. The three largest populations in 2006 were introduced
populations. In addition, we evaluated eleven potential Oregon chub introduction sites in the
Willamette River drainage.
We introduced Oregon chub into the South Stayton Pond, a recently restored site
located on ODFW property in the Santiam drainage, from Stayton Public Works Pond and
Pioneer Park Pond.
The Oregon Chub Recovery Plan (U.S. Fish and Wildlife Service 1998) set recovery
criteria for downlisting the species to “threatened” and for delisting the species. The criteria for
downlisting the species are: 1) establish and manage 10 populations of at least 500 adult fish,
2) all of these populations must exhibit a stable or increasing trend for five years, and 3) at least
three populations meeting criterion 1 and 2 must be located in each of the three recovery areas
(Middle Fork Willamette River, Santiam River, and Mid-Willamette River tributaries). In 2006,
there were 18 populations totaling 500 or more individuals (Table 1). Thirteen of these
populations also met the second criteria. Of the 13 populations meeting criteria 1 and 2, eight
were located in the Middle Fork Willamette drainage, three were located in the Mid-Willamette
drainage, and two were located in the Santiam drainage. With the addition of one more stable
population in the Santiam drainage, the downlisting criteria will be met.
Findings to date indicate that Oregon chub remain at risk due to the loss of suitable
habitat and the continued threats posed by the proliferation of non-native fishes, illegal water
withdrawals, accelerated sedimentation, and potential chemical spills or careless pesticide
applications. Their status has improved in recent years, resulting primarily from successful
introductions and the discovery of previously undocumented populations.
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- Purpose:
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- Time Period of Content:
- Geographic Extent: Santiam, Mid-Willamette, Middle Fork Willamette, McKenzie, and Coast Fork Willamette
- Status: Final
- Use Constraints:
- Format: PDF File
Data Quality Information
- Lineage-Source:
Data Information
- No data information was supplied.
Entity and Attribute Information
- Attributes Description:
Is a physical copy maintained for reference at Headquarters?
Yes
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Chub2006.pdf
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