Seedling Ecology and Restoration of Blackbrush (Coleogyne ramosissima) in the Mojave Desert, United States

2014 ◽  
Vol 22 (5) ◽  
pp. 692-700 ◽  
Author(s):  
Lisa C. Jones ◽  
Susanne Schwinning ◽  
Todd C. Esque
2017 ◽  
Vol 39 (6) ◽  
pp. 431 ◽  
Author(s):  
T. A. Jones

Ecological restoration in the United States is growing in terms of the number, size, and diversity of projects. Such efforts are intended to ameliorate past environmental damage and to restore functioning ecosystems that deliver desired levels of ecosystem services. In nine current restoration case studies from across the continental United States, this paper details (1) the impacts of the original disturbance and compounding secondary issues that compel restoration, (2) the corrective practices applied to advance restoration goals, and (3) the prospects for recovery of ecosystem services, including those involving associated animal populations. Ecosystem-altering impacts include flood control (Kissimmee River), flood control and navigation (Atchafalaya Basin), damming for irrigation-water storage (Colorado River) and hydroelectric power (Elwha River), logging and fire suppression (longleaf pine forest), plant invasions that decrease fire-return intervals (Great Basin shrublands, Mojave Desert), nutrient and sediment loading of watersheds (Chesapeake Bay, Mississippi River delta), and conversion of natural lands to agriculture (tallgrass prairie). Animal species targeted for recovery include the greater sage-grouse (Great Basin shrublands), the red-cockaded woodpecker (longleaf pine forest), the south-western willow flycatcher (Colorado River and its tributaries), the desert tortoise (Mojave Desert), eight salmonid fish (Elwha River), and the blue crab and eastern oyster (Chesapeake Bay).


1985 ◽  
Vol 23 (2) ◽  
pp. 227-235 ◽  
Author(s):  
Kenneth L. Cole ◽  
Robert H. Webb

Small-scale late Holocene vegetation changes were determined from a series of 13 modern and fossil packrat middens collected from a site in the Greenwater Valley, northern Mojave Desert, California. Although the site is above the modern lower limit ofColeogyne ramosissima(black-brush), macrofossils of this shrub are only present in samples younger than 270 yr B.P. In order to measure changes more subtle than presence vs absence, macrofossil concentrations were quantified, and principal components and factor analyses were used to distinguish midden plant assemblages. Both the presence/absence data and the statistical analyses suggest a downward shift of 50 to 100 m forColeogyne(blackbrush) communities between 1435 and 1795 A.D.


Zootaxa ◽  
2009 ◽  
Vol 2168 (1) ◽  
pp. 57-62 ◽  
Author(s):  
WILLIAM F. BARR ◽  
JACQUES RIFKIND

Enoclerus vernalis, new species, is described from the Mojave Desert of California. Enoclerus valens, new species, is described from Arizona. Enoclerus spinolae (LeConte 1853), broadly distributed in the U. S. Southwest and also occurring in northern Mexico, is resurrected as a valid species. Distribution and biology of some yucca associated Enoclerus species are briefly discussed.


2005 ◽  
Vol 27 (9) ◽  
pp. 1697-1720 ◽  
Author(s):  
Michael L. Wells ◽  
Mengesha A. Beyene ◽  
Terry L. Spell ◽  
Joseph L. Kula ◽  
David M. Miller ◽  
...  

Botany ◽  
2012 ◽  
Vol 90 (4) ◽  
pp. 293-299 ◽  
Author(s):  
Bryce A. Richardson ◽  
Susan E. Meyer

Coleogyne ramosissima Torr. (blackbrush) is a dominant xerophytic shrub species in the ecotone between the warm and cold deserts of interior western North America. Amplified fragment length polymorphisms (AFLPs) were used to survey genetic diversity and population genetic structure at 14 collection sites across the species range. Analysis revealed significant population differentiation (FST = 0.103, p < 0.0001) and reasonably high levels of genetic diversity (expected heterozygosity; HE = 0.26), a surprising result for a putative paleoendemic species. Model-based Bayesian clustering, principal coordinates analysis, and neighbor-joining analysis all produced support for the existence of two metapopulations, the first centered on the Mojave Desert and the second on the Colorado Plateau. These genetic data, coupled with information from Late Pleistocene and Holocene packrat (genus Neotoma Say and Ord, 1825) middens, illustrate a demographic history in which eastern and western distributions were disjunct during the Last Glacial Maximum and remained so through the Holocene, forming the present-day metapopulations in the Mojave Desert and Colorado Plateau. This strong regional genetic differentiation has implications for population persistence and migration in response to future climate change, as well as for shrubland restoration following anthropogenic disturbances such as annual grass invasion and wildfire.


1995 ◽  
pp. 101-129 ◽  
Author(s):  
James R. Zimbelman ◽  
Steven H. Williams ◽  
Vatche P. Tchakerian

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