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Global-scale drivers of ploidy state in aquatic macrophytes
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  • Tatiana Lobato-de Magalhães,
  • Kevin Murphy,
  • Andrey Efremov,
  • Victor Chepinoga,
  • Thomas Davidson,
  • Eugenio Molina-Navarro
Tatiana Lobato-de Magalhães
Autonomous University of Queretaro
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Kevin Murphy
University of Glasgow
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Andrey Efremov
Ul'anovskij gosudarstvennyj pedagogiceskij universitet imeni I N Ul'anova
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Victor Chepinoga
Central Siberian Botanical Garden SB RAS
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Thomas Davidson
Aarhus Universitet
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Eugenio Molina-Navarro
University of Alcalá Research and Learning Resources Center
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Abstract

To determine potential drivers of the global distribution of ploidy in aquatic macrophyte species we allocated ploidy state to 1572 species occurring in 238 10 × 10° gridcells worldwide. Analysis of the relationship of 16 global-scale spatial, landscape, environmental, and biotic variables with ploidy state using Boosted Regression Trees revealed temperature variables and evapotranspiration as the strongest predictors. There were contrasting latitudinal patterns between haploid/diploid and polyploid species, while species richness measures also influenced ploidy state. Polyploid species occupied larger geographical ranges than haploid/diploid species. Mixed ploidy species showed the highest latitudinal range size and maximum latitude of species occurrence. Our findings suggest that increased chromosome number is associated with tolerance of a wider range of environmental conditions in macrophyte species. Mixed ploidy could reflect adaptability to expand geographical occurrence via chromosome number change, with such species predominantly occupying a latitude range intermediate between haploid/diploid and polyploid macrophyte dominance.