Red List habitat classification > RLF - Heathland and scrub > RLF8.2 Madeiran xerophytic scrub

Madeiran xerophytic scrub

Quick facts

Red List habitat type code RLF8.2
Threat status
Europe Endangered
EU Endangered
Relation to
Source European Red List habitat factsheet
European Red List of habitats reports
European Red List of habitats (Excel table)

Summary

 

Xerophytic nano- to microphanerophytic communities, sclerophyllous, succulent (or having other kinds of morphological adaptations to drought) of the lower altitudes in Madeira island. These include: (1) communities dominated by paleomediterranean shrubs or small trees: Olea, Maytenus, Chamaemeles: with hard leathery leaves (Mayteno-Oleion maderensis) that stand for mature zonal vegetation of permanent character in thin cambisols of rocky steep cliffs in the infra to thermomediterranean (sometimes infra-thermotemperate in the north face) semi-arid to dry belts. In their upper altitude limit some of these communities (Myrtus communis with Hypericum canariense) may be the natural edge or first seral stage of the Apollonias barbujana thermomediterranean sub-humid forests (included in G2.3 type, Visneo-Apollonion); (2) Thick succulent stemmed Euphorbia piscatoria summer-deciduous communities that are seral stages of the former (i.e. i)), permanent communities or pioneer in rocky leptosols, for instance in low altitude abandoned fields; (3) inframediterranean/temperate sub-humid half-sclerophyllous tall shrub communities of the northern face, transitional from xerophytic to mesophytic heathlands (Syderoxylon mirmulans community: Visneo-Apollonion barbujanae); (4) chamaephytic communities of neomediterranean shrubs, having rolled, hairy, waxy or resinous leaves, or exhibiting leaflessness the most part of the year, that are seral stages of the zonal sclerophyllous types, pioneer or sometimes permanent in semiarid steep rocky cliffs (Soncho-Artemision argenteae); (5) xerophytic succulent low-scrub semi-halonitrophyllous under some influence of salt winds and nitrates from bird dropping deposition of Calendula maderensis (Argyranthemo suculenti-Calendulion maderensis).

The two later variants (iv) and v)) could be together separated as a subtype within the F8.2 type, but since they are found usually in mosaic with the other variants without regional or landscape separation, this is superfluous for habitat typology purposes. The main contacts of the F8.2 type are with Grenovio-Aeonietea succulent rock wall vegetation (Sinapidendro-Aeonion glutinosi, H3.3 Macaronesian inland cliffs). Where the semi-halonitrophyllous scrubs are not found in mosaic with other communities of H8.2, they can be considered as type H6.8a Mediterranean halo-nitrophilous scrubs.

Indicators of good quality:

In general, dominant plants and the bioindicator set should be identified at its maximum mumber as a measure of ecological integrity (see characteristic species, flora, vascular plants). As to the sclerophyllous or half-sclerophyllous variants (i and ii) that are successionaly replaced by the ii) or iv) variants by disturbance, the more elements of Euphorbia piscatoria community (E. piscatoria, Echium nervosum or Globularia salicina) or any of the iv) variant (Carlina salicifolia, Artemisia argentea, Erysimum maderense, Genista tenera, Helichrysum monizii, Micromeria varia subsp. thymoides and Phagnalon lowei), the more the sclerophyllous i) variant is formally close to collapse. Nevertheless, since this happens from natural or expected human-induced causes and the seral stages are themselves floristically valuable, some care should be taken in evaluating the whole of the mosaic of variants within the F8.2 type for conservation purposes. The same reasoning applies to the v) variant (indicators: Argyranthemum pinnatifidum subsp. suculentum and Calendula maderensis). Reliable indicators of degradation are the increase in dominance of tall-grass stages: Hyparrhenia sinaica (=H. hirta auct mad.), Cenchrus ciliaris, Dactylis glomerata subsp. hylodes or any kind of disturbance-prone or nitrophyllous vegetation.

Note on delimitation of habitat type

We restrict the habitat concept to the xerophytic hard-leaved/succulent in low-altitude (infra-thermomediterranean) semi-arid to dry nano-microphanerophytic shrub communities (Rhamno-Oleetea cerasiformis) and also including xerophytic low-scrub in high sea cliffs under the moderate influence of salt winds and nitrates from sea bird droppings (semi-halonitrophyllous communities: Pegano-Salsoletea). Due to its transitional character between xerophytic high scrub (Mayteno-Oleion) and driest /hottest laurel forest (Visneo-Apollonion), the Sideroxylon mirmulans tall-scrub is also included in the type. Chamaephytic communities of salt-rich soil in sea-cliffs under strong influence of salt spray close to wave breaks are not included (Helichrysio obconico-devium) and belong to habitat type B3.1-3c – Macaronesian rocky sea cliffs and shores. Also, chamaephytic vegetation dominated by succulent crassulaceae (Aeonium sp. pl.) is excluded and considered in H3.3.- Macaronesian inland cliffs.

Characteristic species
For full habitat description, please download the habitat factsheet.

Threat status

Synthesis of Red List assessment

The very large reduction in area (-85%) over a 50 year timespan due to urban expansion leads to the Red List category Endangered (EN) under criterion A1. The same category is assessed from the very restricted geographic distribution (both in extent and area of distribution) in combination with continuing negative trends and threats (criteria B1 and B2).
EU
Red List Category Red List Criteria
Endangered A1, B1, B2
Europe
Red List Category Red List Criteria
Endangered A1, B1, B2

Confidence in the assessment

medium
Red List of habitat categories and criteria descriptions

Pressures and threats

  • Transportation and service corridors
    • Roads, motorways
    • Bridge, viaduct
    • Tunnel
  • Urbanisation, residential and commercial development
    • Continuous urbanisation
  • Invasive, other problematic species and genes
    • Invasive non-native species

Habitat restoration potential

Although some of the characteristic species may establish relatively quickly, it is assessed that recovery to a species-rich, natural vegetation takes relatively long.

Trends in extent

Average current trend in quantity

Decreasing Decreasing
EU28 EU28+

Trends in quality

Average current trend in quality

Decreasing Decreasing
EU28 EU28+

Conservation and management needs

Restoration of Madeirean xerophytic scrub should follow the following principles:
1. Establishment of protected areas (micro-reserves) with strict protection of habitat sites and component species as many small locations are within urban or semi-urban context.
2. Removal of pressures or any kind of human-induced disturbance.
3. Removal of alien invaders
4. Allow urban development to take such micro-reserves in account with a buffer around them.

List of conservation and management needs

  • Measures related to forests and wooded habitats
    • Restoring/Improving forest habitats
  • Measures related to spatial planning
    • Establish protected areas/sites
    • Legal protection of habitats and species
    • Manage landscape features

Distribution

For each habitat a distribution map was produced from a wide variety of sources indicating known and potential occurrences of the habitat in 10x10 km grids within Europe. Occurrences in grid cells were given in two classes: actual distribution from relatively reliable sources (surveys, expert knowledge), and potential distribution based on models or less reliable indicators. Please download the fact sheet to see the map.

Geographic occurrence and trends

EU28 Present or presence uncertain Current area of habitat (Km2) Recent trend in quantity (last 50 years) Recent trend in quality (last 50 years)
Madeira Present 2 Decreasing Decreasing
EU28 + Present or presence uncertain Current area of habitat (Km2) Recent trend in quantity (last 50 years) Recent trend in quality (last 50 years)

Extent of Occurrence, Area of Occupancy and habitat area

Extent of Occurrence (EOO) (Km2) Area of Occupancy (AOO) Current estimated Total Area Comment
EU28 4550 14 2
EU28+ 14 2
AOO = the area occupied by a habitat measured in number of 10x10 km grid cells.
EOO = the area (km2) of the envelope around all occurrences of a habitat (calculated by a minimum convex polygon).

Characteristic species

The full list of characteristic species and genus are available above from the Summary. The species available in the EUNIS database are shown here.
Conifers Ephedra fragilis
Flowering Plants Asparagus umbellatus
Flowering Plants Atriplex glauca
Flowering Plants Atriplex halimus
Flowering Plants Calendula maderensis
Flowering Plants Cenchrus ciliaris
Flowering Plants Chamaemeles coriacea
Flowering Plants Cheirolophus massonianus
Flowering Plants Chenoleoides tomentosa
Flowering Plants Crambe fruticosa
Flowering Plants Euphorbia piscatoria
Flowering Plants Jasminum azoricum
Flowering Plants Jasminum odoratissimum
Flowering Plants Lotus macranthus
Flowering Plants Lycium intricatum
Flowering Plants Maytenus umbellata
Flowering Plants Myrtus communis
Flowering Plants Scilla madeirensis
Species scientific name English common name Species group
Ephedra fragilis Conifers
Asparagus umbellatus Flowering Plants
Atriplex glauca Flowering Plants
Atriplex halimus Flowering Plants
Calendula maderensis Flowering Plants
Cenchrus ciliaris Flowering Plants
Chamaemeles coriacea Flowering Plants
Cheirolophus massonianus Flowering Plants
Chenoleoides tomentosa Flowering Plants
Crambe fruticosa Flowering Plants
Euphorbia piscatoria Flowering Plants
Jasminum azoricum Flowering Plants
Jasminum odoratissimum Flowering Plants
Lotus macranthus Flowering Plants
Lycium intricatum Flowering Plants
Maytenus umbellata Flowering Plants
Myrtus communis Flowering Plants
Scilla madeirensis Flowering Plants

Vegetation types

Relation to vegetation types (syntaxa)

Not available

Other classifications

This habitat may be equivalent to, or broather than, or narrower than the habitats or ecosystems in the following typologies.
Classification Code Habitat type name Relationship type
EUNIS Habitat Classification 200711 F8.2 Madeiran xerophytic scrub same
European Environment Agency (EEA)
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