Abstract

A detailed karyotype analysis was carried out on several populations of Bangia atropurpurea (Roth) C. Agardh from marine and freshwater habitats in Italy. All the populations studied had a constant somatic chromosome number of n = 3. A statistical analysis of chromosomal dimensions allowed the recognition of a consistent difference in the size of chromosome 3. Neither marine nor freshwater populations showed significant interpopulation variation in chromosome size and shape; however, comparison of karyotypes between marine and freshwater thalli revealed significant differences. Chromosome 3 of freshwater specimens is significantly shorter than the same chromosome from marine populations, and is possibly metacentric. The results of this study suggest that the proposed con specificity of marine and freshwater populations of Bangia is questionable.

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