Ambiguous species boundaries: Hybridization and morphological variation in two closely related Rubus species along altitudinal gradients
| Autor: | Makiko Mimura, Mihoko Suga |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
0106 biological sciences
species identification introgression Introgression Biology 010603 evolutionary biology 01 natural sciences Sinus (botany) 03 medical and health sciences Hybrid zone lcsh:QH540-549.5 morphology Ecology Evolution Behavior and Systematics Original Research 030304 developmental biology Nature and Landscape Conservation Hybrid 0303 health sciences Ecology food and beverages Phenotypic trait biology.organism_classification Evolutionary biology Backcrossing Biological dispersal lcsh:Ecology Rubus hybrid zone |
| Zdroj: | Ecology and Evolution, Vol 10, Iss 14, Pp 7476-7486 (2020) Ecology and Evolution |
| ISSN: | 2045-7758 |
| Popis: | Although hybridization frequently occurs among plant species, hybrid zones of divergent lineages formed at species boundaries are less common and may not be apparent in later generations of hybrids with more parental‐like phenotypes, as a consequence of backcrossing. To determine the effects of dispersal and selection on species boundaries, we compared clines in leaf traits and molecular hybrid index along two hybrid zones on Yakushima Island, Japan, in which a temperate (Rubus palmatus) and subtropical (Rubus grayanus) species of wild raspberry are found. Leaf sinus depth in the two hybrid zones had narrower clines at 600 m a.s.l. than the molecular hybrid index and common garden tests confirmed that some leaf traits, including leaf sinus depth that is a major trait used in species identification, are genetically divergent between these closely related species. The sharp transition in leaf phenotypic traits compared to molecular markers indicated divergent selection pressure on the hybrid zone structure. We suggest that species boundaries based on neutral molecular data may differ from those based on observed morphological traits. We compared clines of leaf morphology and molecular hybrid index at species boundaries of two closely related but ecologically distinct species. The leaf trait clines were steeper than molecular hybrid index clines. Species boundaries might be less obvious than one would conclude from the morphological traits. |
| Databáze: | OpenAIRE |
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