plants were absent at Pos 1 and 2, small patches at Pos 3 and 4 and large extension at Pos 5 and Pos 6, see Appendix 3 for detail descriptions. Sea bottom substrate
around Pos 1 beach line was different with other beach segments. There were extensions of rocky substrate in front of this area which may reduce the
accessibility. Detail characteristic of each beach segment listed in Table 8 below.
Figure 8 Profile of Pangumbahan beach Landsat 7 ETM+ imagery. Source: http:edcsns17.cr.usgs.govEarthExplorer
Table 8 Characteristic of each beach segment in Pangumbahan
Parameter Pos 1
Pos 2 Pos 3
Pos 4 Pos 5
Pos 6
Dominant sand grain size :
UC medium
sand very fine
sand, fine sand
very fine sand, fine
sand very fine
sand, fine sand
very fine sand,
medium sand
very fine sand, fine
sand
NC medium
sand medium
sand medium
sand very fine
sand medium
sand medium
sand Vegetation:
Most common
species
Pandanus tectorius
Pandanus tectorius
, Calophyllum
inophyllum Pandanus
tectorius Pandanus
tectorius Pandanus
tectorius Pandanus
tectorius
Shade area m
220.72 448.62
150.5 141.95
127.69 374.77
∗ UC: Under vegetation canopy, NC: No vegetation canopy
22
4.1.1.1. Nesting fidelity
Abundance of green turtle landing at each beach segment was not evenly distributed. Pos 2 was the most abundance while Pos 6 was the least Table 9.
There were 15 out of 27 adult female green turtles observed landed at Pos 2, 14 of them successfully laid eggs. Pos 2 was the widest among others and less steep
while Pos 6 was narrow and had steepest slope. The sand substrate at both beach segments was dominated by very fine sand and fine sand grain. However, it was
found that the green turtle sand nest at Pos 2 was dominated by medium sand grain size n = 13 see Figure 9. Nuitja and Uchida 1983 concluded that green
turtle prefer to nest at beach with medium sized grains of sand. The most common species of beach vegetation at all beach segments, including Pos 2 and Pos 6, was
similar, i.e. Sea Pandan Pandanus tectorius. Nuitja 1992 reported that green turtle in Pangumbahan prefered to nest under P. tectorius. Difference between Pos
2 and Pos 6 was the extension of creeper plant Cyperus pedunculatus at Pos 6. The creeper plants might hamper green turtle in digging body pit and nest cavity.
In other words, Pos 2 was freer from burdens. The burdens also came from external factors such as local activity and light disturbance at exposed beach part
Pos 1, 5 and 6. Poaching was susceptible at this particular beach segment, with the most common case was occurred at Pos 5 and 6 outermost part of
conservation area. 23
