DDiissttrriibbuuttiioonn aanndd AAbbuunnddaannccee ooff UUmmppqquuaa CChhuubb iinn SSoouutthh UUmmppqquuaa RRiivveerr aanndd CCooww CCrreeeekk,, OOrreeggoonn DDaavviidd CC.. SSiimmoonn && DDoouuggllaass FF.. MMaarrkkllee OOrreeggoonn SSttaattee UUnniivveerrssiittyy Outline • Introduction • Review the description of Umpqua chub • Review of 1987 and 1998 status surveys • Methods: 2006 plan of study • Results • Notes on other species Introduction… • Small cyprinid formerly recognized as O. crameri • Described as new species O. kalawatseti in 1991 (Markle et al.) • Umpqua Basin endemic • Lives in moderate to no flow habitats in several rivers and stream • Considered “sensitive-vulnerable” by ODFW Introduction… • Carl Bond (unpubl.) noted the species had different habitat requirements • Long (1984) indicated that the differences might be subspecific Slightly different mouth position Oregon chub (terminal mouth) Umpqua chub (slightly subterminal mouth) Breast scalation pattern Oregon chub: fully scaled breast Umpqua chub: naked or partially scaled breast Breast scalation pattern PCA of 12 measurements Umpqua chub Oregon chub Reproduction Spawning substrates (aquaria): -Oregon chub always chose vegetation -Umpqua chub always chose rocks or hard surfaces Spawning behavior (aquaria): -Umpqua chub males more aggressive than Oregon chub males Field validation -Oregon chub choose vegetation in the wild. -No observations on Umpqua chub Genetic differences? (Starch gel electrophoresis—21 enzymes, 88 specimens) Umpqua chub Most specimens had a unique muscle lactate dehydrogenase (LDH-A) Oregon chub LDH-A allele rare Suggestive of species-level differences and more recent work by Phil Harris and Bill Ardren corroborate genetic differences.