送交者: Latino2 于 2005-4-06, 15:24:48:
回答: 继续胡说八道 由 boxer 于 2005-4-06, 13:40:41:
Supplementary Methods
The experiment was replicated three times from 16-24 June 2004 in an area south of Dinosaur National Monument in northwestern Colorado, USA (108º 56’ W, 40º 19’ N). Young adult insects were collected and tagged with radiotransmitters (Biotrack, Ltd., UK)(Fig. 1a) at 10m intervals along a transect assumed to be near the center of a large migratory band. Transplanted insects (n=10, 20 and 20 in the first (Fig. 1b, red), second (Fig. 1b, blue), and third replicates (Fig. 1b, orange), respectively) were released along similar transects at matched sites with similar topography and vegetation 3.1-4.7 km to the southeast where moving cricket bands had previously occurred, but were currently absent. The remaining insects (n=10 in all replicates, Fig. 1b, black) were released back into the band at the collection site, but five individuals were first transported to the transplant site and returned to control for a transportation effect. There was no effect of transportation as evidenced by 100% survivorship of the control insects (Fig. 1b, black).
All tagged crickets were located with hand-held radio receivers8 once daily for two days. The band was too large to measure group size, but it was at least 2 km2 and contained >2,000,000 insects. A reciprocal transplant experiment examining the survivorship of Mormon crickets from low-density, non-outbreak populations translocated into migratory bands was not logistically possible because no such populations were known to occur in the area.