Annual grass invasion in sagebrush steppe: the relative importance of climate, soil properties and biotic interactions

Sheel Bansal, Roger L Sheley


The invasion by winter-annual grasses (AGs) such as Bromus tectorum into sagebrush steppe throughout the western USA is a classic example of a biological invasion with multiple, interacting climate, soil and biotic factors driving the invasion, although few studies have examined all components together. Across a 6000-km(2) area of the northern Great Basin, we conducted a field assessment of 100 climate, soil, and biotic (functional group abundances, diversity) factors at each of 90 sites that spanned an invasion gradient ranging from 0 to 100 % AG cover. We first determined which biotic and abiotic factors had the strongest correlative relationships with AGs and each resident functional group. We then used regression and structural equation modeling to explore how multiple ecological factors interact to influence AG abundance. Among biotic interactions, we observed negative relationships between AGs and biodiversity, perennial grass cover, resident species richness, biological soil crust cover and shrub density, whereas perennial and annual forb cover, tree cover and soil microbial biomass had no direct linkage to AG. Among abiotic factors, AG cover was strongly related to climate (increasing cover with increasing temperature a...Continue Reading


May 1, 1967·Biological Reviews of the Cambridge Philosophical Society·R H Whittaker
Feb 17, 2001·Nitric Oxide : Biology and Chemistry·K M MirandaD A Wink
May 17, 2006·Trends in Ecology & Evolution·Raphael K DidhamNeil J Gemmell
Aug 30, 2006·Ecological Applications : a Publication of the Ecological Society of America·Eric W SeabloomAndy P Dobson
Jun 2, 2010·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Fernando T MaestreAdrián Escudero
May 14, 2011·Ecological Applications : a Publication of the Ecological Society of America·J J JamesM J Rinella
Jun 23, 2011·Biological Reviews of the Cambridge Philosophical Society·Lars GötzenbergerMartin Zobel
Apr 5, 2012·Ecological Applications : a Publication of the Ecological Society of America·Sierra C McLane, Sally N Aitken
Jun 13, 2012·Biological Reviews of the Cambridge Philosophical Society·Mary Susanne WiszJens-Christian Svenning
Aug 6, 2013·Global Change Biology·Celine BellardFranck Courchamp

❮ Previous
Next ❯


Dec 10, 2016·Ecological Applications : a Publication of the Ecological Society of America·Rachel M MitchellG Matt Davies
Jan 30, 2020·Global Change Biology·Jane A CatfordDavid Tilman

❮ Previous
Next ❯

Related Concepts

Trending Feeds


Coronaviruses encompass a large family of viruses that cause the common cold as well as more serious diseases, such as the ongoing outbreak of coronavirus disease 2019 (COVID-19; formally known as 2019-nCoV). Coronaviruses can spread from animals to humans; symptoms include fever, cough, shortness of breath, and breathing difficulties; in more severe cases, infection can lead to death. This feed covers recent research on COVID-19.


Blastomycosis fungal infections spread through inhaling Blastomyces dermatitidis spores. Discover the latest research on blastomycosis fungal infections here.

Nuclear Pore Complex in ALS/FTD

Alterations in nucleocytoplasmic transport, controlled by the nuclear pore complex, may be involved in the pathomechanism underlying multiple neurodegenerative diseases including Amyotrophic Lateral Sclerosis and Frontotemporal Dementia. Here is the latest research on the nuclear pore complex in ALS and FTD.

Applications of Molecular Barcoding

The concept of molecular barcoding is that each original DNA or RNA molecule is attached to a unique sequence barcode. Sequence reads having different barcodes represent different original molecules, while sequence reads having the same barcode are results of PCR duplication from one original molecule. Discover the latest research on molecular barcoding here.

Chronic Fatigue Syndrome

Chronic fatigue syndrome is a disease characterized by unexplained disabling fatigue; the pathology of which is incompletely understood. Discover the latest research on chronic fatigue syndrome here.

Evolution of Pluripotency

Pluripotency refers to the ability of a cell to develop into three primary germ cell layers of the embryo. This feed focuses on the mechanisms that underlie the evolution of pluripotency. Here is the latest research.

Position Effect Variegation

Position Effect Variagation occurs when a gene is inactivated due to its positioning near heterochromatic regions within a chromosome. Discover the latest research on Position Effect Variagation here.

STING Receptor Agonists

Stimulator of IFN genes (STING) are a group of transmembrane proteins that are involved in the induction of type I interferon that is important in the innate immune response. The stimulation of STING has been an active area of research in the treatment of cancer and infectious diseases. Here is the latest research on STING receptor agonists.


Microbicides are products that can be applied to vaginal or rectal mucosal surfaces with the goal of preventing, or at least significantly reducing, the transmission of sexually transmitted infections. Here is the latest research on microbicides.