Difference between revisions of "Gymnopogon ambiguus"
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===Fire ecology=== <!--Fire tolerance, fire dependence, adaptive fire responses--> | ===Fire ecology=== <!--Fire tolerance, fire dependence, adaptive fire responses--> | ||
| − | It occurs on annually burned pine plantations.<ref name=fsu/> This species is dependent on fire disturbance, and fire suppression leads to the decline of this species.<ref name= "nature"/> | + | It occurs on annually burned pine plantations.<ref name=fsu/> This species is dependent on fire disturbance, and fire suppression leads to the decline of this species.<ref name= "nature"/> Although it can be found in areas that are fire-excluded, populations show significant decreases over time.<ref>Clewell, A. F. (2014). "Forest development 44 years after fire exclusion in formerly annually burned oldfield pine woodland, Florida." Castanea 79: 147-167.</ref> |
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Revision as of 14:23, 17 May 2019
| Gymnopohon ambiguus | |
|---|---|
| |
| Photo taken by Kevin Robertson | |
| Scientific classification | |
| Kingdom: | Plantae |
| Division: | Magnoliophyta - Flowering plants |
| Class: | Liliopsida – Monocotyledons |
| Order: | Poales |
| Family: | Poaceae ⁄ Gramineae |
| Genus: | Gymnopogon |
| Species: | G. ambiguus |
| Binomial name | |
| Gymnopogon ambiguus (Michx.) Britton, Sterns & Poggenb. | |
| |
| Natural range of Gymnopogon ambiguus from USDA NRCS Plants Database. | |
Common name: bearded skeletongrass; Eastern skeleton grass; Eastern beard grass
Contents
Taxonomic notes
Description
"Tufted, rhizomatous, perennial; culms branching, nodes and internodes glabrous. Leaves cauline; blades glabrous on both surfaces, margins scaberulous, bases cordate; sheaths conspicuously overlapping, glabrous, usually pilose apically; ligules membranous, ciliolate, less than 0.4 mm long; collars usually pilose. Spikes racemose; branches spreading, flexuous, angled, scaberulous. Spikelets in two rows on one side of rachis, 1-flowered, occasionally a rudiment present in G. amibguus, appressed; pedicels angled, scaberulous, absent or to 1.5 mm long. Glumes 1-nerved, margins usually scarious; paleas 2-nerved, margins usually scarious, acute; callus usually bearded; rachilla prolonged or capped by sterile floret. Grain reddish, linear-ellipsoid." [1]
"Culms 3-7 dm tall. Blades to 6 cm long, 2-8 mm wide; ligules occasionally ciliate, 2.5 mm long. Spikelets beyond middle of spike only, 2.5-4.5 mm long. Glumes 2.5-4.5 mm long; lemmas pubescent apically, body 2-2.3 mm long, dorsal awns 1-3.5 mm long; paleas 2.2-3 mm long. Grain 1.8-2 mm long."[1]
Distribution
Gymnopogon ambiguus is generally found in the eastern United States, from Pennsylvania, Ohio, Indiana, and Iowa south to Florida, Kansas, Missouri, and Texas.[2] More specifically, G. ambiguus is found from southern New Jersey west to Kentucky, Ohio, and Missouri, south to southern Florida and Texas.[3]
Ecology
Habitat
General habitats of G. ambiguus includes glades, prairies, dry pinelands and woodlands, dry fields, and barrens.[3] This species has been observed to grow in open pine woods along the edges of depression ponds, longleaf pine-oak-wiregrass sandhill communities, sparsely wooded ecotone borders of limestone glades, longleaf pine-turkey oak flats and sand ridges, xeric sand pine scrub, upland pine oak woodlands, and clearings within mixed woodland forests. This plant has been seen growing in open and partial shaded environments in dry, loamy, and loose sands and well as moist sandy clay loam. Also growing in disturbed areas, G. ambiguus has been observed in powerline corridors, along trails, on pine plantations, and on open fields. [4] As well, it has been shown to benefit from the overstory being thinned, but not clearcut.[5] It mostly prefers soils that acidic that are composed of sand, cherty residue, or sandstone.[6] G. ambiguus is considered an indicator species of the north Florida subxeric sandhills habitat, and a characteristic species of the shortleaf pine-oak-hickory community in the Red Hills Region of northern Florida and southern Georgia.[7][8]
Associated species includes Pinus palustris, Quercus falcata, Baptista hirsuta, Quercus nigra, Pterocaulon, stillingia, Heterotheca, Liquidambar styraciflua, Aristida stricta,Solidago, Andropogon, Sorghastrum, Pinus taeda, and Bluestem.[4]
Phenology
This species commonly flowers between August and October.[3] Flowers and fruits have been observed on this species from September to November.[4][9]
Seed dispersal
This species is thought to be dispersed by gravity. [10]
Fire ecology
It occurs on annually burned pine plantations.[4] This species is dependent on fire disturbance, and fire suppression leads to the decline of this species.[6] Although it can be found in areas that are fire-excluded, populations show significant decreases over time.[11]
Use by animals
Comprised deer diets more in the summer than in the winter.[12]
Conservation and management
This species is listed as extirpated by the Indiana Department of Natural Resources, Division of Nature Preserves and by the Pennsylvania Department of Conservation and Natural Resources; it is listed as presumed extirpated by the Ohio Department of Natural Resources, Division of Natural Areas and Preserves. As well, it is listed as a species of special concern by the Kentucky State Nature Preserves Commission.[2] Due to this as well as its susceptibility to intense disturbances like logging or heavy grazing, it is listed as a G4 global status. The biggest threats to G. ambiguus are fire suppression and habitat destruction, so fire regiments should be implemented for the management of this species. Fire regiments should mimic natural burn cycles, and intense disturbances (logging, vehicle traffic, heavy grazing) should be ceased. Since it is usually scattered infrequently in its habitat, large expanses should be set aside for this management for a healthy population. Seasonality of burns should be studied more to find whether this affects G. ambiguus populations. If grazing is implemented, it should be on a rotational program to prevent heavy grazing.[6]
Cultivation and restoration
This species has a high restoration potential due to its susceptibility to fire suppression and intense disturbance. If management practices like fire regiments and ceasing of habitat destruction or disturbance are implemented, then areas can most likely be restored for G. ambiguus populations to increase. This species requires ground species that are already established, and restoration efforts of bare ground will most likely not be successful. When these management techniques are used, the presence of this species in the seed bank will help restore the species; without seeds present in the seed bank, populations of G. ambiguus will not be fully restored.[6]
Photo Gallery
References and notes
- ↑ 1.0 1.1 Radford, Albert E., Harry E. Ahles, and C. Ritchie Bell. Manual of the Vascular Flora of the Carolinas. 1964, 1968. The University of North Carolina Press. 118. Print.
- ↑ 2.0 2.1 USDA, NRCS. (2016). The PLANTS Database (http://plants.usda.gov, 17 May 2019). National Plant Data Team, Greensboro, NC 27401-4901 USA.
- ↑ 3.0 3.1 3.2 Weakley, A. S. (2015). Flora of the Southern and Mid-Atlantic States. Chapel Hill, NC, University of North Carolina Herbarium.
- ↑ 4.0 4.1 4.2 4.3 .Florida State University Robert K. Godfrey Herbarium database. URL: http://herbarium.bio.fsu.edu. Last accessed: June 2014. Collectors: Loran C. Anderson, Wilson Baker, Robert K. Godfrey, James R. Burkhalter, Angus Gholson, Richard D. Houk, Robert Kral, Andre F. Clewell, D. L. Martin, S. T. Cooper, Sidney McDaniel, R.A. Norris, D. C. Hunt, R. Komarek, and J.M. Kane. States and Counties: Florida: Gadsden, Jackson, Jefferson, Lafayette, Leon, Madison, Marion, Nassau, Putnam, Santa Rosa, and Wakulla. Georgia: Grady and Thomas.
- ↑ Brockway, D. G. and C. E. Lewis (2003). "Influence of deer, cattle grazing and timber harvest on plant species diversity in a longleaf pine bluestem ecosystem." Forest Ecology and Management 175: 49-69.
- ↑ 6.0 6.1 6.2 6.3 [[1]] NatureServe Explorer. Accessed: May 17, 2019
- ↑ Carr, S. C., et al. (2010). "A Vegetation Classification of Fire-Dependent Pinelands of Florida." Castanea 75(2): 153-189.
- ↑ Clewell, A. F. (2013). "Prior prevalence of shortleaf pine-oak-hickory woodlands in the Tallahassee red hills." Castanea 78(4): 266-276.
- ↑ Nelson, G. PanFlora: Plant data for the eastern United States with emphasis on the Southeastern Coastal Plains, Florida, and the Florida Panhandle. www.gilnelson.com/PanFlora/ Accessed: 17 MAY 2019
- ↑ Kirkman, L. Katherine. Unpublished database of seed dispersal mode of plants found in Coastal Plain longleaf pine-grasslands of the Jones Ecological Research Center, Georgia.
- ↑ Clewell, A. F. (2014). "Forest development 44 years after fire exclusion in formerly annually burned oldfield pine woodland, Florida." Castanea 79: 147-167.
- ↑ Thill, R. E. (1983). Deer and cattle forage selection on Louisiana pine-hardwood sites. New Orleans, LA, USDA Forest Service.
