Rocky Mountain Research Station Publications

RMRS Online Publication - Journal Articles, External Publications, and Special Reports
The impact of pinyon mortality on ground-dwelling arthropod communities


Delph, Robert J. 2008. The impact of pinyon mortality on ground-dwelling arthropod communities. Flagstaff, AZ: Northern Arizona University. 56 p. Thesis.

We documented the indirect impact of drought-induced mortality of pinyon pine (Pinus edulis) on ground-dwelling arthropod communities. Tree mortality alters microhabitats utilized by ground-dwelling arthropods through increased solar radiation, dead woody debris, and understory vegetation. Our major objectives were to determine if there were differences in species composition, richness and abundance of ground dwelling-arthropods associated with environments experiencing high or low pinyon mortality and whether specific microhabitats could account for differences. We predicted significant impacts on arthropod community dynamics due to the increased complexity of micro-habitats from both standing and fallen trees. Despite only moderate increases in the amount of area that experienced new microhabitats, there were significant differences in arthropod community composition between high and low pinyon mortality environments. Overall, 22% (51 taxa) of the arthropod community were identified as being indicators of high or low pinyon mortality. Thus, our study supported the notion that arthropods are responsive to disturbance events that lead to even moderate changes in the environment. However, areas of high tree mortality also contained lower tree densities, allowing for the possibility that intrinsic differences in woodlands that vary in susceptibility to drought-induced mortality plays a significant role in structuring ground-dwelling arthropod communities.

Keywords: pinyon mortality, arthropod communities, pinyon pine, Pinus edulis


About PDFs: For best results, do not open the PDF in your Web browser. Right-click on the PDF link to download the PDF file directly to your computer. Click here for more PDF help.

The PDF below was scanned and converted to text. Some errors may occur.


Download Article
http://www.fs.fed.us/rm/pubs_other/rmrs_2008_delph_r001.pdf

PDF File Size: 845 K


Title: RMRS Other Publications: The impact of pinyon mortality on ground-dwelling arthropod communities
Electronic Publish Date: March 19, 2009
Last Update:
March 19, 2009

RMRS Publications | Order a publication | Contact Us