Abstract
The distribution pattern of Atriplex vesicaria (perennial saltbush) was examined in a number of locations extending from Hay in western New South Wales to Koonamore Station in South Australia. The populations sampled were from a range of locations exhibiting a variety of topographical, edaphic, and effective rainfall conditions. The scales and intensities of pattern varied considerably between sites, but in all sites there was evidence of contagion on at least two scales (both larger than could be attributed to the morphology of the individual plants) and in no instance was there evidence of uniform (underdispersed) distribution. The two major scales of pattern were attributable to the development of gregariousness and either the patchiness of nodulated limestone (or gypsum) in the soils or the development of gilgai relief. It was demonstrated for one site that drought stress had brought about an apparent decrease in the stocking density of A. vesicaria; this reduction of density was associated with a decline in pattern intensity, although the scales of pattern present in the original vegetation were maintained in the residual population.
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Claims 7
Claim · model-written summary
Pattern scales and intensities varied considerably between sites.
- Taxon
- Atriplex vesicaria
Atriplex vesicariat0 - Outcome
- scales and intensities of patterne0
- Direction
- varied considerablye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The scales and intensities of pattern varied considerably between sites”
t0“Atriplex vesicaria”
Claim · model-written summary
Every sampled site had contagion at two or more scales.
- Taxon
- Atriplex vesicariaAtriplex vesicariat0
- Outcome
- contagione0
- Value
- at least two scalese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in all sites there was evidence of contagion on at least two scales”
t0“Atriplex vesicaria”
Claim · model-written summary
No sampled site showed uniform distribution.
- Taxon
- Atriplex vesicariaAtriplex vesicariat0
- Outcome
- uniform (underdispersed) distributione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in no instance was there evidence of uniform (underdispersed) distribution”
t0“Atriplex vesicaria”
Claim · model-written summary
The two main spatial scales were attributed to gregariousness and soil patchiness or gilgai relief.
- Taxon
- Atriplex vesicariaAtriplex vesicariat0
- Outcome
- two major scales of patterne0
- Qualifier
- development of gregariousness and either the patchiness of nodulated limestone (or gypsum) in the soils or the development of gilgai reliefe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The two major scales of pattern were attributable to the development of gregariousness and either the patchiness of nodulated limestone (or gypsum) in the soils or the development of gilgai relief”
t0“Atriplex vesicaria”
Claim · model-written summary
Drought stress apparently decreased saltbush stocking density at one site.
- Taxon
- A. vesicariaAtriplex vesicariae0
- Treatment
- drought stresse0
- Outcome
- stocking densitye0
- Direction
- decreasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“drought stress had brought about an apparent decrease in the stocking density of A. vesicaria”
Claim · model-written summary
The drought-associated density reduction accompanied lower pattern intensity.
- Taxon
- Atriplex vesicariaAtriplex vesicariat0
- Outcome
- pattern intensitye0
- Direction
- declinee0
- Comparator
- reduction of densitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“this reduction of density was associated with a decline in pattern intensity”
t0“Atriplex vesicaria”
Claim · model-written summary
The original spatial scales persisted in the residual population.
- Taxon
- Atriplex vesicariaAtriplex vesicariat0
- Outcome
- scales of patterne0
- Direction
- maintainede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the scales of pattern present in the original vegetation were maintained in the residual population”
t0“Atriplex vesicaria”