Journal
COMPARATIVE CYTOGENETICS
Volume 6, Issue 4, Pages 371-377Publisher
PENSOFT PUBLISHERS
DOI: 10.3897/CompCytogen.v6i4.3955
Keywords
Biogeography; chromosome number; cytogeography; cytotaxonomy; Europe; polyploidy
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We compared chromosome number (CN) variation among vascular floras of three different countries with increasing latitude in the Boreal hemisphere: Italy, Slovakia, Poland. Aim of the study was to verify whether the patterns of CN variation parallel the differences in latitudinal ranges. The three datasets comprised 3426 ( Italy), 3493 ( Slovakia) and 1870 ( Poland) distinct cytotypes. Standard statistics ( ANOVA, Kruskal-Wallis tests) evidenced significant differences among the three countries, mean CN increasing together with latitude. On the contrary, an inverse relation ( r = -1) was evidenced among the frequency of odd CNs and latitude. Our results show that the hypothesis of a polyploid increase proportional with distance from the Equator seems to be confirmed, when territories from the same hemisphere are compared.
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