Figure 1. Factors affecting population density (Click for animation).
Figure 1. Factors affecting population density (Click for animation).
| Species | Number Counted | Estimated Number per Acre |
||||||
Transect A |
Transect B | Transect C | Transect A |
Transect B | Transect C | Average |
||
Chestnut Oak |
20 | 28 | 18 | 380 | 531 | 342 | 417 | |
Sugar Maple |
5 | 4 | 7 | 95 | 76 | 133 | 101 | |
Amer. Beech |
13 | 15 | 16 | 247 | 285 | 304 | 287 | |
Table 1. Results of line-transect survey.
FIgure 2. Method to determine death, birth, emigration and immigration rates using mark
and recapture
Figure 3. Fish catch curve.
Figure 4. Method for separating immigration and emigration from birth
and death rates.
| Life Table for the Barnacle Balanus glandula | ||||||||
| Age (yr) | Obs # Alive | # Surviving | # Dying | Mort. Rate | Avg # Alive | Life Expec | For Graph | |
x |
nx |
lx |
dx |
qx |
Lx |
Tx |
ex |
log(lx) |
0 |
142 |
1000 |
563 |
0.563 |
718.5 |
1577 |
1.577 |
3 |
1 |
62 |
437 |
198 |
0.4530892 |
338 |
858.5 |
1.9645309 |
2.640481 |
2 |
34 |
239 |
98 |
0.4100418 |
190 |
520.5 |
2.1778243 |
2.378398 |
3 |
20 |
141 |
32 |
0.2269504 |
125 |
330.5 |
2.3439716 |
2.149219 |
4 |
15.5 |
109 |
32 |
0.293578 |
93 |
205.5 |
1.8853211 |
2.037426 |
5 |
11 |
77 |
31 |
0.4025974 |
61.5 |
112.5 |
1.461039 |
1.886491 |
6 |
6.5 |
46 |
32 |
0.6956522 |
30 |
51 |
1.1086957 |
1.662758 |
7 |
2 |
14 |
0 |
0 |
14 |
21 |
1.5 |
1.146128 |
8 |
2 |
14 |
14 |
1 |
7 |
7 |
0.5 |
1.146128 |
9 |
0 |
0 |
-- |
-- |
-- |
-- |
-- |
|
Table 2. Life Table for a Barnacle population.
Figure 5. Survivorship curve for Balanus glandula
Figure 6. The three types of survivorship curves.