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Title Estimates of hybridization between two species of catostomids in the Columbia River
Creator/Author Dauble, D.D. ; Buschbom, R.L.
Publication Date1981 Jan 01
OSTI IdentifierOSTI ID: 5103567
Other Number(s)Journal ID: CODEN: COPAA
Resource TypeJournal Article
Resource RelationJournal: Copeia; (United States); Journal Volume: 4
Research OrgBattelle Pacific Northwest Labs., Richland, WA
Subject59 BASIC BIOLOGICAL SCIENCES; FISHES; POPULATION DYNAMICS; AQUATIC ECOSYSTEMS; COLUMBIA RIVER; COMPARATIVE EVALUATIONS; ECOLOGY; GENETICS; HABITAT; MORPHOLOGY; REGIONAL ANALYSIS; ANIMALS; AQUATIC ORGANISMS; BIOLOGY; ECOSYSTEMS; RIVERS; STREAMS; SURFACE WATERS; VERTEBRATES
Description/Abstract Extent of hybridization is described between two sympatric catostomids, Catostomus macrocheilus and C. columbianus, from the Hanford Reach of the Columbia River, southeastern Washington state. Estimated percentage of hybrids based on presence of intermediate meristic characters ranged from 12.4 to 14.6% of the total sucker population. Discriminant function analysis reduced subjective variability and lowered estimates of hybridization to 3.0 to 7.1%. Principal component analysis also provided evidence that the suspected hybrids were intermediate between populations of C. macrocheilus and C. columbianus. Meristic characters contributed most to all methods of treatment, with number of lateral line scales the best single criterion for species separation. Any analysis of closely related species would benefit from examination of offspring from artificial crosses and from knowledge of allopatric population characteristics. Breakdown of isolating mechanisms leading to C. macrocheilus X C. columbianus crosses may result from overlap in spawning time and incomplete habitat segregation. Morphological and coloration differences at spawning may provide a basis for species recognition, thus providing some degree of ethological isolation.
Country of PublicationUnited States
LanguageEnglish
FormatSize: Pages: 802-810
System Entry Date2007 May 21

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