Day One
Rock 1
Rock 2
Rock 3
Rock 4
Rock 5
Table 2.1. Comparison of the amount of Batillaria Minima
on the five rocks. Percent cover of the rock above and under
were estimated. Measurements taken include concentration around the
rock and area of the rock. By multiplying the respective percent
cover by the area of each rock, I calculated the approximate area of
snails above and under each rock.
| |
concentration around
cm |
cover under |
cover above |
area of rock cm^2 |
area of snails under rock cm^2 |
area of snails above rock cm^2 |
| Rock 1 |
1 |
85% |
5% |
56 |
47.6 |
2.8 |
| Rock 2 |
2 |
80% |
40% |
92 |
73.6 |
36.8 |
| Rock 3 |
1 |
95% |
5% |
84 |
79.8 |
4.2 |
| Rock 4 |
2 |
80% |
1% |
220 |
176 |
2.2 |
| Rock 5 |
> 1 |
90% |
5% |
55 |
49.5 |
2.75 |
Figure 2.1 shows the difference between the percent cover above and
under the rocks. The means of each value are plotted with bars
denoting the variance in each sample,
Table 2.2
| Group |
Mean (%) |
Standard Error |
| Above Rock
Area |
9.75 |
6.770561277 |
| Under Rock
Area |
85.3 |
23.5547872 |
Table 2.3. A single factor ANOVA was performed to determine if the percent cover
above the rock differed significantly from the percent cover under the
rock. Astericks (*) mark differences that are significant (p < .05).
Anova: Single
Factor |
|
|
|
|
|
|
|
|
|
|
|
|
|
| SUMMARY |
|
|
|
|
|
|
| Groups |
Count |
Sum |
Average |
Variance |
|
|
| area of snails under rock cm^2 |
5 |
426.5 |
85.3 |
2774.14 |
|
|
| area of snails on top of rock
cm^ 2 |
5 |
48.75 |
9.75 |
229.2025 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| ANOVA |
|
|
|
|
|
|
| Source of Variation |
SS |
df |
MS |
F |
P-value |
F crit |
| Between Groups |
14269.5063 |
1 |
14269.5063 |
9.5024168 |
0.01505748* |
5.31765506 |
| Within Groups |
12013.37 |
8 |
1501.67125 |
|
|
|
|
|
|
|
|
|
|
| Total |
26282.8763 |
9 |
|
|
|
|
DAY TWO