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2 January 2013

Schismus arabicus (Arabian schismus)

Datasheet Type: Invasive species

Abstract

This datasheet on Schismus arabicus covers Identity, Overview, Distribution, Dispersal, Diagnosis, Biology & Ecology, Environmental Requirements, Natural Enemies, Impacts, Uses, Prevention/Control, Further Information.

Identity

Preferred Scientific Name
Schismus arabicus Nees, 1841
Preferred Common Name
Arabian schismus
Other Scientific Names
Schismus spectabilis Fig. & De Not.
International Common Names
English
Arabian grass
camel grass
Mediterranean grass
schismus
split grass

Summary of Invasiveness

S. arabicus is an annual grass from the Old World that has become widespread and invasive in arid and semi-arid regions of North America and Australia. In North America it has become prevalent in parts of the Sonoran Desert and most of the Mojave Desert. In Australia it is confined to southern and western parts. The grass competes for limiting nutrients and water with native annual plants by occupying spaces between desert shrubs. Its numerous fibrous roots form a dense mat beneath the soil surface. S. arabicus promotes fires, because its dead stems readily carry flames and thus increase fire frequencies and the size of burned areas. In southern California, the decline of the native annual grass Vulpia octoflora (six-weeks fescue) is linked to the increase in S.arabicus. Spread is aided by harvester ants carrying seeds to their nests, as seedlings grow better in ant nests than outside.

Taxonomic Tree

This content is currently unavailable.

Notes on Taxonomy and Nomenclature

Schismus arabicus and S. barbatus are often treated as a single species due to their morphological and ecological similarity. Gould (1951) treated S. arabicus as a subspecies of S. barbatus and believed that the two taxa broadly intergrade. In many ecological studies, the two species are not being distinguished and are treated as a single taxon. This datasheet treats them as separate species.

Plant Type

Annual
Grass / sedge
Herbaceous
Seed propagated

Description

S. arabicus is a small, tufted annual grass. Culms are erect to ascending, green, smooth, usually widely spreading and 5-20 cm tall. Leaf blades are thread-like, up to 2 mm wide and up to 7 cm long, and usually inrolled. Leaves are mostly basal. At the base of a leaf blade is a ring of rigid hairs of ca 3 mm long. Inflorescence is a dense and narrow panicle, becoming purplish. Spikelets are laterally compressed and contain 5-10 florets. Glumes are persistent, lanceolate, with 3-5 veins and larger than lowest lemmas. Lemmas are membranous, with two lobes at the end and have 9 veins. Paleas are shorter or as long as lemmas and without awns. Caryopses (seeds) are 0.5-0.8 mm long, roundish and loosely bounded by palea and lemma.

Distribution

S. arabicus is native to the Africa, Asia and parts of Europe. It has become widespread and invasive in arid and semi-arid regions of North America and Australia. In North America, it has become prevalent in parts of the Sonoran Desert and most of the Mojave Desert. In Australia, it is confined to southern and western parts.

Distribution Map

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Distribution Table

This content is currently unavailable.

History of Introduction and Spread

The exact date of its introduction to North America is obscure because S.arabicus and S. barbatus were often treated as a single species. Felger (1990) treated S. arabicus as a synonym for S. barbatus in his account of Sonoran plant species. He stated that the earliest record in North America is from 1926 in southern Arizona, where the grass has been observed on the floodplain of the Gila River near Sacaton. By 1928 the species had become established and from Arizona it spread westwards (Burgess et al., 1991; Esque and Schwalbe, 2002).
In California, the grass was first observed in Fresno County in 1935 (Felger, 1990). By the 1940s it was abundant throughout the Mojave and Sonoran Deserts (Kemp and Brooks, 1998). Since then, both S. arabicus and S. barbatus have increased their distribution and are now some of the most abundant annual plant species in the deserts of North America (Esque and Schwalbe, 2002).
The oldest specimen collected in South Australia and held in the State Herbarium of South Australia is from 1932 (Atlas of Living Australia, 2012).

Risk of Introduction

The grass is unlikely to be introduced intentionally to new areas, but it is likely that it will continue to spread within areas where it has become established.
The grass is listed in the Global Invasive Species Database of the Invasive Species Specialist Group (ISSG, 2012), but it is not listed on any state noxious weed list within the USA.

Means of Movement and Dispersal

Natural Dispersal (Non-Biotic)

Detached spikelets or tiny seeds are blown along the ground by wind. Sheet flooding in arid regions also carries seeds away. Seeds often persist within the inflorescence, which detaches after the plant has dried out and is blown across the ground (Brooks, 2000).

Vector Transmission (Biotic)

Seeds are not adapted for animal dispersal, but in Arizona harvester ants (Veromessor pergandei and Pogonomyrmex rugosus) collect seeds and carry them to their nests (Rissing, 1986). Seeds that are not consumed by ants and germinate in ant nests grow to be significantly larger plants than those growing on sites outside ant nests due to a higher nutrient content. The number of seeds per plant may be 15 times higher in ant nests than outside. In the native range of S. arabicus, ant species of the genus Messor also disperse seeds (Pisarski, 1978).
In Chile, introduced rabbits and hares appear to promote spread of the grass, probably by digging activities, causing soil disturbances, and by damaging native shrubs (Manrique et al., 2007).

Accidental Introduction

As the grass grows in disturbed sites, human activities such as road and railroad construction, off-road vehicle use and urbanization will promote the spread of Schismus seeds. Seeds may also be carried by traffic wind and on clothing. In a study modelling the potential distribution of S. arabicus in Sonora, Mexico, factors associated with human-caused disturbances proved to be the best predictors (Sánchez-Flores, 2007).

Pathway Causes

Pathway causeNotesLong distanceLocalReferences
Disturbance (pathway cause)Soil disturbance promotes spread Yes
Forage (pathway cause)Used as a forage grassYesYes

Pathway Vectors

Pathway vectorNotesLong distanceLocalReferences
Host and vector organisms (pathway vector)Seeds carried by harvester ants Yes
Land vehicles (pathway vector)Off-road vehicles causing soil disturbances promotes spread Yes
Soil, sand and gravel (pathway vector)Spread is promoted by soil disturbances Yes
Wind (pathway vector)Seeds are wind dispersedYesYes

Similarities to Other Species/Conditions

The closely related S. barbatus is distinguished from S. arabicus by lemmas with shorter terminal points constituting15-25% of the total length of the lemma. In S. arabicus, this value amounts to 30-50%. The presence of hairs on the lemma and the length of the palea in S. arabicus are probably the most distinct differences. Nevertheless, both species are annuals and are so similar that distinguishing them is not easy.

Habitat

S. arabicus grows in open and disturbed sites in arid and semi-arid regions. Typical habitats include semi-arid shrublands, roadsides, waste areas, fields, dry river beds and the spaces between desert shrubs (Hickman, 1993; Brooks and Berry, 2006). After disturbance and if bare soil is present, the grass can also colonize coastal shrubland (Brooks, 2000). Within its native range, the grass is an important component of steppes and desert vegetation in Israel, especially in the Negev Desert (Feinbrun-Dothan, 1986). In California, S. arabicus is found from 0 to 1300 m elevation (Brooks, 2000). In Arizona, S. arabicus or S. barbatus occupy an elevation of 395-1580 m (Esque and Schwalbe, 2002).

Habitat List

CategorySub categoryHabitatPresenceStatus
Terrestrial    
TerrestrialTerrestrial – ManagedCultivated / agricultural landSecondary/tolerated habitatNatural
TerrestrialTerrestrial – ManagedDisturbed areasPrincipal habitatHarmful (pest or invasive)
TerrestrialTerrestrial – ManagedDisturbed areasPrincipal habitatNatural
TerrestrialTerrestrial – ManagedRail / roadsidesSecondary/tolerated habitatHarmful (pest or invasive)
TerrestrialTerrestrial – ManagedRail / roadsidesSecondary/tolerated habitatNatural
TerrestrialTerrestrial – ManagedUrban / peri-urban areasSecondary/tolerated habitatHarmful (pest or invasive)
TerrestrialTerrestrial – ManagedUrban / peri-urban areasSecondary/tolerated habitatNatural
TerrestrialTerrestrial ‑ Natural / Semi-naturalScrub / shrublandsPrincipal habitatHarmful (pest or invasive)
TerrestrialTerrestrial ‑ Natural / Semi-naturalScrub / shrublandsPrincipal habitatNatural
TerrestrialTerrestrial ‑ Natural / Semi-naturalDesertsPrincipal habitatHarmful (pest or invasive)
TerrestrialTerrestrial ‑ Natural / Semi-naturalDesertsPrincipal habitatNatural
TerrestrialTerrestrial ‑ Natural / Semi-naturalArid regionsPrincipal habitatHarmful (pest or invasive)
TerrestrialTerrestrial ‑ Natural / Semi-naturalArid regionsPrincipal habitatNatural

Biology and Ecology

Genetics

The chromosome number was determined to be 2n=12 for plants from Israel and Libya (Faruqi and Quraish, 1979; Díaz Lifante et al., 1992).

Reproductive Biology

The grass is annual and reproduces by seed. S. arabicus is self-pollinating and self-fertilizing, but it hybridizes with the closely related S. barbatus (Faruqi and Quraish, 1979). Hybrids are fully fertile.

Physiology and Phenology

Flowering time is from January to May in Arizona (Guertin, 2003). The grass will flower until water stress causes senescence (Brooks, 2000). Schismus species are winter annuals and with sufficient rain, germination can occur within two weeks (Pake and Venable, 1995). In North American deserts, S. arabicus is among the first of the winter annuals to flower and the last to die (Pake and Venable, 1995). As a desert annual and winter ephemeral depending on rainfall for germination and growth, it shows great variability in abundance from year to year.
In the southwestern USA, seed germinates in early winter (Brooks, 2000).
In its native range, germination depends on temperature, light conditions and rainfall (Gutterman, 1996a; Gutterman et al., 2010). It can germinate after early winter rains or following later winter rains. The phase of vegetative growth is longer if germination occurs early (Gutterman, 1989). Growth is controlled by day length. The grass has also been observed to germinate following summer rains in southern Egypt and Saudi Arabia (Gutterman, 1996b).
A prolonged after-ripening period is evident in S. arabicus, as the germination rate of stored seeds was higher than that of fresh seeds in plants from its native range (Gutterman, 1996a). Germination in the dark was much higher than in light in a study with seeds from the Negev Desert (Gutterman, 1996a).
Following senescence, plants may remain rooted and standing upright for up to two years. Eventually culms are detaching at the roots and are then blown across the ground (Brooks, 2000).

Population Size and Structure

Abundance of this desert annual varies greatly from year to year because growth and germination depend on rainfall. Once established it may become frequent and cover can reach 45-70% (Howard, 2006). Seed set can be high, e.g. 89 plants covering 1 square metre produced ca 10.000 caryopses (Loria and Noy-Meir, 1979/1980); this gives an average of 112 seeds per plant.

Associations

In the Central Asian Gurbantunggut Desert, the grass is colonized by arbuscular mycorrhizal fungi (Zhang et al., 2012).

Environmental Requirements

S. arabicus is adapted to arid conditions. It emerges during winter and completes its life cycle in spring. In the Negev Desert of Israel, the grass completes its life cycle even in years with less than 100 mm rainfall (Gutterman et al., 2010). In the Central Asian Gurbantunggut Desert, where the grass is a native component of spring ephemerals, mean monthly temperatures range from -20° C to -15° C in January and from 22° C to 26° C in July (Zhang et al., 2012).

Climate

Climate typeDescriptionPreferred or toleratedRemarks
BS - Steppe climate> 430mm and < 860mm annual precipitationPreferred 
BW - Desert climate< 430mm annual precipitationPreferred 
Cs - Warm temperate climate with dry summerWarm average temp. > 10°C, Cold average temp. > 0°C, dry summersPreferred 
Csa - Mediterranean climateWarm average temp. > 10°C, Cold average temp. > 0°C, dry summers, warmest month average temp. > 22°CPreferred 

Rainfall

ParameterLower limitUpper limitDescription
Dry season duration  number of consecutive months with <40 mm rainfall
Mean annual rainfall15025mm; lower/upper limits

Soil Tolerances

Soil texture > light
Soil texture > medium
Soil drainage > free
Special soil tolerances > shallow
Special soil tolerances > infertile

Notes on Natural Enemies

The smut fungus Sporisorium aegyptiacum (A.A. Fisch. Waldh.) Vánky occurs on S. arabicus in Australia (Shivas, 2010), but the fungus does not appear to cause significant damage to the plant. In the Central Asian Gurbantunggut Desert, the grass is colonized by arbuscular mycorrhizal fungi (Zhang et al., 2012).

Natural enemies

Natural enemyTypeLife stagesSpecificityReferencesBiological control inBiological control on
Sporisorium aegyptiacumPathogen
Seeds
    

Impact Summary

CategoryImpact
Economic/livelihoodNegative
Environment (generally)Negative

Impact: Economic

In Arizona, both S. arabicus and S. barbatus are reported as weeds in fields cultivated by Pima Indians (Rea, 1997).

Impact: Environmental

Impact on Habitats

Both S. arabicus and S. barbatus can significantly alter desert ecosystems because these annual grasses accumulate fuel and hence affect fire regimes. In the Sonoran Desert, S. arabicus is considered to be an invasive grass causing serious ecological damage (Van Devender et al., 1997). Fire frequency has increased since 1970 in the Sonoran Desert region (Brooks et al., 2005). In the Mojave Desert, several wildfires in the 1990s were fueled mostly by Schismus litter (Brooks, 1999). Schismus species are not alone responsible for altered fire regimes in the Sonoran Desert but do contribute to fuel accumulation; other alien grasses present in the area such as red brome (Bromus rubens) and buffelgrass (Pennisetum ciliare) have the same effects (Esque and Schwalbe, 2002). It is thought that adventive Bromus species fuel hot, fast-moving and continuous fires, whereas Schismus fuels cooler, slower-moving and more patchy fires (Brooks, 1999).

Impact on Biodiversity

Both S. arabicus and S. barbatus compete with native annuals and grasses for water, nutients and microhabitats in the deserts of North America. Where Schismus grasses are abundant, changes in community composition and species abundances occur, further exacerbated by the grass/fire cycle (see above).
The first stems and leaves often spread out close to the ground, which may prevent other desert ephemerals from sprouting (Van Devender et al., 1997).
Alien annual grasses including Bromus spp. and Schismus spp. affect habitats of the endangered desert tortoise (Gopherus agassizii) in the Mojave Desert as a result of increased fire frequencies (Brooks and Esque, 2002). Fires result in both decreased amounts and altered seasonal availabilities of preferred food plants (US Fish and Wildlife Service, 1994). These effects cannot be attributed to S.arabicus alone, since several alien annual grasses are present in the area.
The degree to which the grass causes ecological damages is differently rated among regions. In Arizona, S. arabicus has been categorized as an invasive plant of medium risk by the Arizona Wildlands Invasive Plant Working Group (SBSC, 2012), based on a regionally developed assessment protocol. The California Invasive Plant Council rates S. arabicus as a species with limited impacts (Cal-IPC, 2012). In the Sonoran Desert, S. arabicus is among six exotic plant species potentially causing the most ecological damage (Van Devender et al., 1997).

Impact: Social

Increases in fire frequencies (see Environmental Impact) due to S. arabicus represent hazards to the public.

Risk and Impact Factors

Invasiveness

Proved invasive outside its native range
Has a broad native range
Abundant in its native range
Is a habitat generalist
Tolerates, or benefits from, cultivation, browsing pressure, mutilation, fire etc
Pioneering in disturbed areas
Fast growing
Has high reproductive potential
Gregarious

Impact outcomes

Damaged ecosystem services
Ecosystem change/ habitat alteration
Modification of fire regime
Monoculture formation
Reduced native biodiversity
Threat to/ loss of native species

Impact mechanisms

Competition - monopolizing resources
Rapid growth
Rooting

Likelihood of entry/control

Difficult to identify/detect as a commodity contaminant
Difficult to identify/detect in the field

Uses

Economic Value

S. arabicus is a good forage grass and has been used at least in the past for pastures (Felger, 1990; USDA-ARS, 2012).

Uses List

Animal feed, fodder, forage > Forage

Prevention and Control

Due to the variable regulations around (de)registration of pesticides, your national list of registered pesticides or relevant authority should be consulted to determine which products are legally allowed for use in your country when considering chemical control. Pesticides should always be used in a lawful manner, consistent with the product's label.

Cultural Control and Sanitary Measures

Grazing is not an ideal method to contain S.arabicus, as stated by Brooks (2000). He notes that although grazing can reduce S. arabicus, Schismus biomass increases following moderate to intense grazing, because grazing animals cause soil disturbances and reduce shrub cover. This promotes further spread of the grass.

Physical/Mechanical Control

Hand removal is impractical due to the plant’s small size (Brooks, 2000). Due to the extensive mat of roots under the soil surface, pulling up the grass causes substantial soil disturbances, thereby creating conditions which encourage further establishment of S. arabicus (Brooks, 2000). The same holds for ploughing, disking or scraping. Fire generally promotes the growth of S. arabicus.

Chemical Control

A late application of glyphosate or grass-specific herbicides has proven to be effective in killing plants (Marushia et al., 2010). If fuel accumulation and seed set are to be prevented, herbicides need to be applied at the pre-bolting rosette stage. However, the small surface area of the leaves and culms makes herbicide application difficult (Brooks, 2000).

Gaps in Knowledge/Research Needs

Studies on the long-term ecological effects of this grass are largely lacking. The role of fires in spreading this invasive grass is not yet fully understood and here studies are badly needed. Many studies do not distinguish between S. arabicus and S. barbatus, hence exact data on local distribution and abundance of S. arabicus are often lacking.

Links to Websites

NameURLComment
California Invasive Plant Councilhttp://www.cal-ipc.org 
GISD/IASPMR: Invasive Alien Species Pathway Management Resource and DAISIE European Invasive Alien Species Gatewayhttps://doi.org/10.5061/dryad.m93f6Data source for updated system data added to species habitat list.
Information Management System for Invasive Specieshttp://www.invasivespecies.org 
Southwest Biological Science Centerhttp://sbsc.wr.usgs.gov 

Organizations

NameAddressCountryURL
California Invasive Plant Council (Cal-IPC)1442-A Walnut Street,#462, Berkeley
California,CA 94709
USAhttp://www.cal-ipc.org/

References

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