the pink wild bean (strophostyles umbellata) julie e. moore nature reserve
TRANSCRIPT
Characteristicshttp://plants.usda.gov/cgi_bin/plant_profile.cgi?symbol=STUM2
• Perennial vine with circular petals divided into 3 leaflets
• Flowers are irregular in shape and are up to 1.5cm wide (0.6 inches)
• Blooms first appear in early summer and continue into mid fall
Niche• Fields and open woods with sandy or rocky soil
• Found typically in waist-high grass and brush near and around wooded areas, not typically found in open areas of fields in constant sunlight
Habitat
• Most of eastern United States: Alabama, Arkansas, Florida, Georgia, Illinois, Indiana, Kentucky, Louisiana, Maryland, Mississippi, Missouri, North Carolina, Ohio, Pennsylvania, South Carolina, Tennessee, East Texas, & Virginia
Methods of Study• The Pink Wild Bean was chosen due to its
visibility and unique characteristics• A 1-meter radius circle was used as the
area of study• A total of 30 areas were chosen
haphazardly from the Jewel E. Moore Nature Preserve
• Care had to be taken to insure all plants in the study area were found due to there ground dwelling nature
RESULTS:Dispersal Patterns of the Pink
Wild Bean Number
in plots Observed Freq. Observed Prob. Poisson Prob.
0 13 0.13 0.368
1 2 0.02 0.368
2 7 0.07 0.184
3 2 0.02 0.061
4 1 0.01 0.015
5 1 0.01 0.003
6 2 0.02 0.001
RESULTS:Dispersal Patterns of the Pink
Wild Bean
# of individuals / Plot
Poi
sson
pro
babi
lity
val
ues
Mean of 1.0
0
0.1
0.2
0.3
0.4
1 2 3 4 5 6 7
CONCLUSIONS:
• From the analysis of the “number of indiv. per plot vs. Poisson prob., it can be seen that the data most closely represents a random or a contagious distribution but led to conclusion with just visual data, to clarify statistically, a chi-square test was done
• The Variance to Mean ratio resulted in a chi square value of 120.06 with 29 degrees of freedom
• From Figure 4C.6, our data showed that our species fell well within the range of contagious