Speciation and Mating Behavior in <i>Eudorina</i>*

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<jats:p><jats:bold>SYNOPSIS. </jats:bold> A comparative morphological study was made of 73 clones of <jats:italic>Eudorina</jats:italic> isoated from 44 natural populations and grown under controlled environmental conditions. Utilizing the information obtained in this study in association with the existing taxonomic and experimental literature concerning <jats:italic>Eudorina</jats:italic> a monographic treatment of the genus was prepared. Nine species and 4 varieties are now recognized.</jats:p><jats:p>Sexual compatibility was investigated with 22 heterothallic pairs, 3 male strains and one female strain representing 4 species and one variety of <jats:italic>Eudorina.</jats:italic> Five partially or completely sexually‐isolated groups were found: 3 groups containing strains of a single species, a fourth group composed of strains of another species, and a fifth group made up of strains of 3 different species. Strains with different zygote arrangements were found generally not to intercross.</jats:p><jats:p>Intraspecific crosses indicated that a single pair of alleles controls the inheritance of mating types and that gene flow occurs between strains representing different natural populations. Interspecific crosses resulted in the formation of polyploid or aneuploid F1 offspring which shewed an abnormal segregation of the mating types. Abnormal mating type segregation was also obtained in F2 crosses involving certain of the hybrid polyploid offspring.</jats:p>

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