conservation status and phylogeography of cowhead lake tui chub in the northwestern great basin l.
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Conservation Status and Phylogeography of Cowhead Lake Tui Chub in the Northwestern Great Basin. Yongjiu Chen & Bernie May Genomic Variation Laboratory Department of Animal Science University of California, Davis, CA 95616 Stewart Reid, 2045 East Main St. Ashland, OR 97520. Background.

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conservation status and phylogeography of cowhead lake tui chub in the northwestern great basin

Conservation Status and Phylogeography of Cowhead Lake Tui Chub in the Northwestern Great Basin

Yongjiu Chen & Bernie May

Genomic Variation Laboratory

Department of Animal Science

University of California, Davis, CA 95616

Stewart Reid,

2045 East Main St. Ashland, OR 97520

background
Background
  • Small fish in the minnow family (Cyprinidae).
  • Subspecies, Siphateles bicolor vaccaceps.
  • Cowhead Lake basin, Modoc Co, California.
  • Its genetic relationship is uncertain.
  • Population decline due to increased human activity and natural stochastic events.
  • Proposed for listing under the US ESA in 1998.
questions
Questions
  • Is the Cowhead Lake tui chub distinct from other geographically proximate populations?
  • Which tui chub population is the most closely related?
  • What is the degree of genetic variation remaining in the Cowhead Lake tui chub population?
materials methods
Materials & Methods
  • Two independent tui chub samplings from the Cowhead Lake.
  • Assess genetic variability at the population level.
  • Use 10 microsatellite DNA loci.

High variation within populations

Bi-parentally inherited

slide6

Summer Lake

Catlow Valley

Oregon

NORTH AMERICA

Warner Valley

Goose Lake

Cowhead Lake

Pit River

Nevada

California

Eagle Lake

Sample Localities

slide7

Cowhead Lake Tui Chub

Goose Lake Tui Chub

Gel Image of Cowhead Lake & Goose Lake tui chubs

slide10

Catlow Valley

Summer Lake

Cowhead Lake

Warner Valley

Goose Lake/Pit River

Eagle Lake

Factorial correspondence analysis

slide11

Catlow Valley

Summer Lake

Eagle Lake

Cowhead Lake

Pit River

Warner Valley

Goose Lake

0.1

FST-Based Neighbor-Joining Tree

slide12

Warner Valley(37)

Eagle Lake(33)

Summer Lake(69)

Goose Lake/Pit River(53)

Cowhead Lake(79)

Catlow Valley(15)

Bayesian analysis of individual assignment

conclusions
Conclusions
  • The Cowhead Lake tui chub is distinct from other geographically proximate populations.
  • No substantial differentiation within the remnant Cowhead Lake population.
  • Comprises relatively low degrees of genetic variability.
  • Should be listed as “endangered” under the US ESA.
  • The Warner Valley tui chub may be the most closely related to the Cowhead.
  • Goose Lake and Pit River tui chubs are the most closely related.
future studies
Future Studies
  • Population structure of Cowhead Lake tui chub.
  • Gene flow between Cowhead Lake and Warner Valley tui chub populations.
  • Genetic and taxonomic status of Summer Lake and Eagle Lake tui chubs.
slide15

Acknowledgement

Dr. Douglas Markle, Oregon State University

Dr. Peter Moyle, UC Davis

Genomic Variation Laboratory, UC Davis

California Department of Fish & Game

U. S. Fish & Wildlife Service