Cholla Cacti Grows in cylindrical segments. Main plant density occurs at the base of los pinos. Structure prevents plant from being eaten by larger mammals Cholla are much more abundant than the prickly pear
Reproduction Eggs Juveniles will depend on their host plant until they are adults. Juveniles that have hatched
Hypothesis 1 “Bug abundance on cholla cacti is greater on plants closer to the prickly pear cacti”.
Method Chose random Prickly pear and surveyed the surrounding cholla within a 15 m Radius. Surveyed 108 Cholla plants Took GPS coordinates for each plant with an accuracy of ~.5-1 meter to be able to measure plant distances.
Fruits 15 Or 5 Fruits were taken from nearby prickly pear and placed on the plant that would be in the experiment. Prickly pear outside of experiment Prickly pear inside the experiment
Predictions By simulating Over Population, the bugs will move out with proportion to the available food source. Bugs will feed on fruit even though it had been cut off from the plant. I am expecting the dispersal to be gradual over 2 or 3 days. Changed it to 24 hours I am also expecting this experiment to follow closely with My first hypothesis.
Results of experimental release 0 0.02 0.04 0.06 0.08 0.1 0.12 0-55-1010-15 proportion recovered per plant low quality high quality no significant effects of treatment or distance Distance from prickly pear
Conclusion. The associational interaction from insects varies from one time frame to another In a Arid ecosystem climate changes over the years influence fruit abundance and the indirect interaction of plants through a mediated insect herbivore.