For his Ph.D. at the University of California, Berkeley, under the mentorship of David Wake, Dr. Vredenburg measured the effects introduced trout were having on mountain yellow-legged frog populations.
This may be explained by weak founder effects when the species was introduced, on-going gene flow, and/or insufficient time for genetic drift to differentiate the populations since their establishment.
In addition, modern techniques like resonance Raman and surface enhanced resonance Raman scattering [ 44] and surface enhanced Raman scattering (SERS) [ 45] were utilized to monitor the effects introduced by chemotherapeutic agents on cancer cells.
Across the 19 landscape test sites, SAF had a positive impact on the four indicators with the strongest effects when introduced on the best quality land.
Initially, we were interested in investigating what effects introducing various cancerous alterations had on signalling through the ERK pathway.
Whether it was Mr. Sambora's guitar-through-a-voice-box effect introducing "Livin' on a Prayer," which started the two-hour concert, or David Bryan's dramatic piano chords in "Always," an encore number, the introductions to most songs drew cheers.
Our mesocosm results with seedlings contrast with field reports indicating extensive and significant negative effects of introduced earthworms on many mature native forbs, and positive effects on sedges.
In forest ecosystems where infrequent, severe fires have been an important process in shaping ecosystem structure, understanding the effects of introduced livestock on post-fire recovery of the vegetation is essential for effective forest resource management and preservation.
In the arid zone overall, and in many individual populations, there were relatively few juveniles and evidence of a chronic recruitment deficit during the last 100 200 years, consistent with reported adverse effects of introduced herbivores on Callitris regeneration.
A two-year field experiment was conducted during 2012 and 2013 growing seasons to evaluate the effects of introduced MRFS on water availability, field productivity and economic benefits using a local wheat (T. aestivum L). cultivar DUMA in a semiarid site of Kenya.
