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  • Biodiversity  (1)
  • Desert grassland  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Soil microarthropods as indicators of exposure to environmental stress in Chihuahuan Desert rangelands (1999)
    Springer
    Biology and fertility of soils 28 (1999), S. 121-128 
    Details
    ISSN: 1432-0789
    Keywords: Key words Desertification ; Desert grassland ; Grazing ; Herbicides ; Indicators
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract  We studied soil microarthropod communities along livestock grazing disturbance gradients, inside and outside grazing exclosures, and on areas subjected to restoration efforts (herbicide and bulldozing) in order to test the suitability of mites as indicators of rangeland soil quality. We found that mite numbers generally increased with decreased grazing disturbance. Soil microarthropods appeared to respond to a complex of factors including soil compaction, depth to an impervious soil layer, below-ground vegetative biomass, and residual effects of herbicide. All of our study plots, except those that had been herbicide treated, were dominated by microbivorous mites of the family Nanorchestidae. The numerical responses of mites, especially nanorchestids, appeared to provide a sensitive indicator of ecosystem health in a Chihuahuan Desert grassland.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003740050472
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  • 2
    Electronic Resource
    Electronic Resource
    Herbivory of clonal populations: cattle browsing affects reproduction and population structure of Yucca elata (1993)
    Springer
    Oecologia 93 (1993), S. 12-17 
    Details
    ISSN: 1432-1939
    Keywords: Herbivory ; Cattle ; Yucca elata ; Biodiversity ; Nutritional value of inflorescences
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The hypothesis that cattle browsing on inflorescences of the soaptree Yucca elata reduces reproductive success was investigated by comparing recruitment and population structure in six populations protected from grazing, six grazed during the flowering season and five grazed outside the flowering season. Cattle consumed 98% of inflorescences, which were found to be highly nutritious. Reduced recruitment in flower-grazed populations could not be attributed to reduced flower survival, as recruitment in non-flower grazed populations was also reduced. Changes in population structure were due to cattle browsing small caudices, including both genets and ramets. An alternate hypothesis of limited germination in soils compacted by cattle was not supported. Cattle browsing of inflorescences reduced reproductive effort, which may be due to the inability of the plants to resorb nutrients after flowering. Browsing also increased branching, probably through lack of apical dominance, whereas physical trampling increased procumbency. Cattle browsing implies a lack of genetic recruitment, possible local extinction of the yucca moth Tegeticula yuccasella, the exclusive pollinator of Y. elata, and local reduction in insect and bird biodiversity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00321184
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