The search for hybrids between Myriophyllum sibiricum and M. spicatum (Haloragaceae) in North Eurasia allowed to clarify their morphological differences and distribution

Myriophyllum sibiricum and M. spicatum are sympatric in large part of their vast ranges in Eurasia and North America and have different habitat preferences only in East Europe and Siberia. Such absence of both geographic and ecological isolation should trigger extensive hybridization between these s...

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Bibliographic Details
Published in:Aquatic botany 2024-03, Vol.191, p.103741, Article 103741
Main Authors: Volkova, Polina A., Ivanova, Maria O., Bobrov, Alexander A.
Format: Article
Language:English
Subjects:
Aquatic plants
artificial habitats
Barcoding
botany
China
chloroplast DNA
climate
cpDNA
Disturbed habitats
Eurasia
geographical distribution
Glaciations
habitats
hybridization
hybrids
intergenic DNA
ITS
Myriophyllum sibiricum
North America
ribosomal DNA
Siberia
species
sympatry
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Summary:Myriophyllum sibiricum and M. spicatum are sympatric in large part of their vast ranges in Eurasia and North America and have different habitat preferences only in East Europe and Siberia. Such absence of both geographic and ecological isolation should trigger extensive hybridization between these species that is indeed observed in North America. The hybrid could be reliably documented only with genetic markers, and in Eurasia this was done only in China. Using genetic markers (ITS2 region of nuclear ribosomal DNA and trnL-trnF intergenic spacer of cpDNA) we documented hybrids between M. sibiricum and M. spicatum on the North Asian Pacific islands with dynamic geological history and climate (Commander and the southern Kuril islands). The hybrid also originated in East Europe (Ivanovo Region) as a result of ecological isolation break due to rapid artificial habitat change. Using genetically verified material throughout temperate Eurasia we clarified morphological characters discriminating M. sibiricum and M. spicatum and, basing on them, refined the species distribution. For the first time we provide a full morphological characteristic of the hybrid between M. sibiricum and M. spicatum and suggest a name for it, M. × hybridum. •Hybrids between Myriophyllum sibiricum and M. spicatum were documented in Eurasia.•They were found on the North Asian Pacific islands and in East Europe.•We used genetic markers (nuclear ITS2 and plastid trnL-trnF) for documentation.•A name M. × hybridum was suggested for the hybrid.•Diagnostic characters for M. sibiricum and M. spicatum were clarified.
ISSN:0304-3770
1879-1522
DOI:10.1016/j.aquabot.2023.103741