Overview

Comprehensive Description

Biology

Inhabits fast rocky riffles.
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Distribution

endemic to a single state or province

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National Distribution

United States

Origin: Native

Regularity: Regularly occurring

Currently: Present

Confidence: Confident

Type of Residency: Year-round

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Global Range: (5000-20,000 square km (about 2000-8000 square miles)) Range includes only the Umpqua River drainage, Oregon (Page and Burr 2011). The drainage basin encompasses approximately 12,000 square kilometers.

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Range Description

Range includes only the Umpqua River drainage, Oregon (Page and Burr 2011). The drainage basin encompasses approximately 12,000 square kilometres.
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North America: Umpqua River drainage in Oregon, USA.
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Oregon, U.S.A.
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Physical Description

Size

Length: 12 cm

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Maximum size: 110 mm TL
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Max. size

11.0 cm TL (male/unsexed; (Ref. 5723))
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Type Information

Paratype for Rhinichthys evermanni Snyder
Catalog Number: USNM 126494
Collection: Smithsonian Institution, National Museum of Natural History, Department of Vertebrate Zoology, Division of Fishes
Collector(s): Cramer & Otaki
Locality: Ore: Umpqua River Roseburg (Ledger Erroneously Says Willamette River), Oregon, United States, North America
  • Paratype: Snyder, J. O. 1908. Bulletin of the United States Bureau of Fisheries. 27 (for 1907): 178, fig. 4.
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Ecology

Habitat

Habitat Type: Freshwater

Comments: Habitat includes fast rocky riffles (Page and Burr 2011).

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Habitat and Ecology

Habitat and Ecology
Habitat includes fast rocky riffles (Page and Burr 2011).

Systems
  • Freshwater
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Environment

demersal; freshwater
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Migration

Non-Migrant: Yes. At least some populations of this species do not make significant seasonal migrations. Juvenile dispersal is not considered a migration.

Locally Migrant: No. No populations of this species make local extended movements (generally less than 200 km) at particular times of the year (e.g., to breeding or wintering grounds, to hibernation sites).

Locally Migrant: No. No populations of this species make annual migrations of over 200 km.

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Trophic Strategy

Comments: Probably similar to R. CATARACTAE which feeds on benthic invertebrates.

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Population Biology

Number of Occurrences

Note: For many non-migratory species, occurrences are roughly equivalent to populations.

Estimated Number of Occurrences: 6 - 20

Comments: Lee et al. (1980) mapped 11 collection locations that are well scattered throughout much of the drainage basin..

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Global Abundance

10,000 - 100,000 individuals

Comments: Total adult population size is unknown but presumably exceeds 10,000. This species appears to be moderately abundant throughout its range (Howe 1978).

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Life History and Behavior

Reproduction

Spawns in spring.

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Conservation

Conservation Status

National NatureServe Conservation Status

United States

Rounded National Status Rank: N3 - Vulnerable

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NatureServe Conservation Status

Rounded Global Status Rank: G3 - Vulnerable

Reasons: Occurs in the Umpqua River drainage, Oregon, where common; stable; not significantly threatened.

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IUCN Red List Assessment


Red List Category
LC
Least Concern

Red List Criteria

Version
3.1

Year Assessed
2013

Assessor/s
NatureServe

Reviewer/s
Smith, K. & Darwall, W.R.T.

Contributor/s

Justification
This species has a somewhat small extent of occurrence, but it is listed as Least Concern in view of the fairly large number of subpopulations and locations, lack of evidence of a substantial decline, and apparent lack of major threats.
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Global Short Term Trend: Relatively stable (=10% change)

Comments: Distribution and abundance appear to be stable (Howe 1978; D. Loomis, pers. comm., 1997).

Global Long Term Trend: Relatively stable (=10% change)

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Population

Population
Lee et al. (1980) mapped 11 collection locations that are well scattered throughout much of the drainage basin.

Total adult population size is unknown but presumably exceeds 10,000. This species appears to be moderately abundant throughout its range (Howe 1978).

Distribution and abundance appear to be stable (Howe 1978; D. Loomis, pers. comm., 1997).

Population Trend
Stable
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Threats

Comments: No currently recognized threats; protective measures already taken; potential threats include poisoning during control projects, logging, and habitat alteration through channelization, dams, and altered stream flow (Howe 1978).

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Major Threats
No currently recognized threats; protective measures already taken; potential threats include poisoning during control projects, logging, and habitat alteration through channelization, dams, and altered stream flow (Howe 1978).
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Not Evaluated
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Management

Biological Research Needs: Investigate life history and ecology (Howe 1978).

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Conservation Actions

Conservation Actions
Currently, this species is of relatively low conservation concern and does not require significant additional protection or major management, monitoring, or research actions.
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Wikipedia

Umpqua dace

Umpqua dace (Rhinichthys evermanni) is a species of ray-finned fish in the genus Rhinichthys.

References

  1. ^ Froese, Rainer, and Daniel Pauly, eds. (2006). "Sinibrama evermanni" in FishBase. April 2006 version.


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