Reality Check
Penultimate Amazing
Citation 9: Evolution in steppe with few large hooved mammals supports the paper
Citation 9: "Evolution in steppe with few large hooved mammals" supports the assertion of no "significant grazing pressure from bison" in grasslands west of the Rockies.
A steppe is not a desert
!
Citation 12: The western limits of the range of the American bison which states that the eastern densities never reached the high western densities. Once again support for no "significant grazing pressure from bison" in grasslands west of the Rockies
If you want to continue with that unsupported HM assumption then you will have to produce evidence that
* the deserts west of the Rockies were grasslands, are of recent origin and expanded as the numbers of boson declined.
* the deserts east of the Rockies were grasslands, are of recent origin and expanded as the numbers of boson declined.
* and the Great Plains have turned into deserts
p) and that the reason is that the large herds of bison were removed from these grasslands.
We will get to the debunking of that HM assumption in a few years after going through the preceding citations but meanwhile Holistic Management: Misinformation on the Science of Grazed Ecosystems
ETA: Make that two lies. These two citations support the debunking of a HM assumption:
Which is a lie (and a derail!), Red Baron Farms, since neither of the cited papers are about deserts or desertification - they are about steppes, grasslands and their ecology.What it supports is Savory's observation that undergrazing can actually cause desertification. ....
Citation 9: "Evolution in steppe with few large hooved mammals" supports the assertion of no "significant grazing pressure from bison" in grasslands west of the Rockies.
(added JSTOR link, full abstract)Citation 9: R. N. Mack and J. N. Thompson, “Evolution in steppe with few large hooved mammals,” American Naturalist, vol. 119, no. 6, pp. 757–773, 1982
Abstract:
The morphology of rhizomatous and caespitose grasses reflects the two extremes to which perennial grasses have evolved at least in partial response to continuous high versus low selection pressure by large congregating mammals. In North America steppe of the Bouteloua Province east of the Rockies is dominated by a mix of mainly rhizomatous C3 and C4 grasses which have long been associated with large herds of Bison and more recently with cattle. Introduction of cattle into these grasslands had much less effect on community structure than did livestock introduction into steppe of the Agropyron Province west of the Rockies which lacked large herds of mammals throughout the Holocene (and perhaps earlier). The underlying cause of native ungulate sparseness may have been related to the moisture cycle of the Prevailing Westerlies, which may have largely excluded C4 species, thereby severely controlling Bison numbers. In these communities both the dominant C3 caespitose grasses and the prominent cryptogam layer were soon destroyed by domestic ungulates and replaced largely by alien winter annuals. The relative changes in these two Provinces over the past 200 yr illustrate the importance in plants of herbivore-adapted traits in generating the overall physiognomy of some steppes and the resiliency of those grasslands to the introduction of novel selection pressure.
A steppe is not a desert
!Citation 12: The western limits of the range of the American bison which states that the eastern densities never reached the high western densities. Once again support for no "significant grazing pressure from bison" in grasslands west of the Rockies
Citation 12. R. Daubenmire, “The western limits of the range of the American bison,” Ecology, vol. 66, no. 2, pp. 622–624, 1985
This states that the eastern densities of bison were always less than the western and supports that there was no "significant grazing pressure from bison (Bison bison)" (my emphasis added - significant grazing pressure would be densities comparable to western densities).It is an intriguing fact that the American bison (Bison bison) which at the start of the 19th century occurred by the millions in steppe habitat east of the Rocky Mountains, was unable to permanently colonize the steppe to the west of the mountains, despite the continuity of such vegetation across South Pass in Wyoming. In recent centuries the few herds that wandered through that mountain gap penetrated various distances but did not survive long.
...
Archaeologists hold that at least two species of Bison occurred west of the Rockies at the close of the Wisconsin glaciation (Schroedl 1973) These lingered on until xerothermic (= Hypsithermal = Altithermal) time, then were replaced by the modern species. Although Boson bison soon became well established west of the Rockies, achieving its maximum, abundance there ~ 3000-1500 yr BP (Butler 1978), it seems never to have reached the high population densities it achieved west of the mountains (Schroedl 1973). Later its numbers west of the mountains diminished more or less progressively until at the time of the Caucasian invasion its continued presence there became dependent on rather short-lived recruitments thorough the Wyoming gap in the mountains. It became extinct as a wild species west of the Rockies early in the 19th century.
If you want to continue with that unsupported HM assumption then you will have to produce evidence that
* the deserts west of the Rockies were grasslands, are of recent origin and expanded as the numbers of boson declined.
* the deserts east of the Rockies were grasslands, are of recent origin and expanded as the numbers of boson declined.
* and the Great Plains have turned into deserts
We will get to the debunking of that HM assumption in a few years after going through the preceding citations but meanwhile Holistic Management: Misinformation on the Science of Grazed Ecosystems
Does Rest Cause Grassland Deterioration?
...
Conclusion. Contrary to the assumption that grasses will senesce and die if not grazed by livestock, studies of numerous relict sites, long-term rested sites, and paired grazed and ungrazed sites have demonstrated that native plant communities, particularly bunchgrasses, are sustained by rest from livestock grazing.
ETA: Make that two lies. These two citations support the debunking of a HM assumption:
Are Western North American Ecosystems Adapted to Herds of Large Hooved Animals?
...
Conclusion. Western US ecosystems outside the prairies in which bison occurred are not adapted to the impact of large herds of livestock. Recent changes to these grassland ecosystems result from herbivory by domestic livestock which has altered fire cycles and promoted invasive species at the expense of native vegetation.
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