Fraxinus angustifolia subsp. danubialis

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Habitus and growth type

  • Height [m]: 20–35
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  • Growth form: tree
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  • Life form: macrophanerophyte
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  • Life strategy (Pierce method based on leaf traits): CS
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  • Life strategy (Pierce method, C-score): 50.5 %
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  • Life strategy (Pierce method, S-score): 41.8 %
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  • Life strategy (Pierce method, R-score): 7.8 %
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Leaf

  • Leaf presence and metamorphosis: leaves present, not modified
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  • Leaf arrangement (phyllotaxis): opposite, verticillate
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  • Leaf shape: compound – imparipinnate
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  • Stipules: absent
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  • Petiole: present
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  • Leaf deciduousness in woody plants: winter deciduous
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  • Functional leaf type in woody plants: broad deciduous or semi-deciduous
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Flower

  • Flower colour: green-white
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  • Perianth type: flower achlamydeous
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  • Inflorescence type: racemus
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  • Generative reproduction type: facultative allogamy
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Fruit, seed and dispersal

  • Fruit type: dry fruit – achene/cypsela/samara
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  • Dispersal unit (diaspore): fruit, infrutescence or its part
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  • Dispersal strategy: Epilobium (mainly anemochory and autochory)
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  • Myrmecochory: non-myrmecochorous (b)
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Belowground organs and clonality

  • Bud bank

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  • Number of buds per shoot at the soil surface (root buds excluded): 0
  • Number of buds per shoot at a depth of 0–10 cm (root buds excluded): 0
  • Number of buds per shoot at a depth greater than 10 cm (root buds excluded): 0
  • Size of the belowground bud bank (root buds excluded): 0
  • Number of buds per shoot at the soil surface (root buds included): 0
  • Number of buds per shoot at a depth of 0–10 cm (root buds included): 0
  • Number of buds per shoot at a depth greater than 10 cm (root buds included): 0
  • Size of the belowground bud bank (root buds included): 0

Trophic mode

  • Parasitism and mycoheterotrophy: autotrophic
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  • Carnivory: non-carnivorous
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  • Symbiotic nitrogen fixation: no nitrogen-fixing symbionts
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Karyology

  • Chromosome number (2n): 46
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  • Ploidy level (x): 2
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  • 2C genome size [Mbp]: 1437.16
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  • 1Cx monoploid genome size [Mbp]: 718.58
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  • Genomic GC content: 36.9 %
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Taxon origin

  • Origin in the Czech Republic: native
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Ecological indicator values

  • Ellenberg-type indicator values

  • Light indicator value: 5 – semi-shade plant, only exceptionally occurring in full light, but usually at more than 10% of the diffuse radiation incident in an open area
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  • Temperature indicator value: 7 – heat indicator, occurring in relatively warm lowlands
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  • Moisture indicator value: 7 – humidity indicator, focus on well moistened, but not wet soils
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  • Reaction indicator value: 7 – indicator of slightly acidic to slightly basic conditions, never occurring in very acidic conditions
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  • Nutrient indicator value: 7 – occurring at nutrient-rich sites more often than at average sites and only exceptionally at poor sites
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  • Salinity indicator value: 0 – not salt tolerant, glycophyte
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  • Indicator values for disturbance

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  • Whole-community disturbance frequency indicator value: -1.84
  • Herb layer disturbance frequency indicator value: -0.76
  • Whole-community disturbance severity indicator value: 0.31
  • Herb layer disturbance severity indicator value: 0.19
  • Whole-community structure based disturbance indicator value: 0.06
  • Herb layer structure-based disturbance indicator value: 0.1

Habitat and sociology

  • Occurrence in habitats

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  • 4 Wetland and riverine herbaceous vegetation

  • 4L Nitrophilous herbaceous fringes of lowland rivers: 1 – rare occurrence
  • 11 Heathlands and scrub

  • 11J Willow galleries of loamy and sandy river banks: 1 – rare occurrence
  • 11L Tall mesic and xeric shrub: 2 – optimum
  • 12 Forests

  • 12B Alluvial forests: 2 – optimum
  • 12C Oak-hornbeam forests: 2 – optimum
  • 12U Plantations of broad-leaved non-native trees: 1 – rare occurrence
  • 13 Anthropogenic vegetation

  • 13E Perennial nitrophilous herbaceous vegetation of mesic sites: 1 – rare occurrence
  • Affinity to the forest environment

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  • Affinity to the forest environment in Thermophyticum: 1.1 – taxon occurring mainly in the closed forest
  • Diagnostic taxon

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  • Constant taxon

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  • Constant taxon of associations: LBA07 Fraxino pannonicae-Ulmetum glabrae
  • Dominant taxon

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  • Dominant taxon of associations: LBA07 Fraxino pannonicae-Ulmetum glabrae
  • Ecological specialization indices

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  • Ecological specialization index for all vegetation types: 6
  • Ecological specialization index for non-forest vegetation: 5
  • Ecological specialization index for forest vegetation: 6.2
  • Colonization ability

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  • Index of colonization success (ICS): 1
  • Index of colonization potential (ICP): 1

Distribution and frequency

  • Elevational belt in the Czech Republic: lowlands
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  • Occurrence frequency in the basic grid mapping cells and quadrants of the basic grid mapping cells: 45, 75
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  • Commonness in vegetation plots from the Czech Republic

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  • Occurrence frequency in vegetation plots: 0.2 %
  • Occurrence frequency in vegetation plots with a cover above 5%: 64.2 %
  • Occurrence frequency in vegetation plots with a cover above 25%: 34.3 %
  • Occurrence frequency in vegetation plots with a cover above 50%: 7.5 %
  • Mean percentage cover in vegetation plots: 20.3 %
  • Maximum percentage cover in vegetation plots: 64 %
  • Number of habitats with taxon occurrence in the Czech Republic

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  • Number of narrow habitats in which the taxon occurs: 7
  • Number of narrow habitats in which the taxon has its optimum: 3
  • Number of broad habitats in which the taxon occurs: 4
  • Number of broad habitats in which the taxon has its optimum: 2

Threats and protection

  • Red List 2017 (national categories): C4a – near threatened taxon
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  • Red List 2017 (IUCN categories): NT – near threatened
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  • Legal protection: not protected by law
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