Biology Field Trip

Topics: Intertidal zone, Crab, Animal Pages: 3 (586 words) Published: November 7, 2012
Data Sheet
Animals found inside the quadrats:

Animal names| Number of Individuals|
| Quadrat 1(near sea water)| Quadrat 2(intertidal zone)| Quadrat 3(splash zone)| Periwinkles| 0| 16| 0|
Barnacles| 0| 19| 0|
Bivalves| 0| 10| 0|
Hermit crabs| 15| 0| 0|
Snail| 1| 0| 0|

Animals found outside the quadrats:
Animal names| Nos.| Micro-habitat|
periwinkles| 42| Rocky shores|
oyster| 20| Rocky shores|
sea cucumber| 51| Gravel beds offshore|
crab| 2| Gravel beds offshore|
Shrimp| 1| Gravel beds offshore|
Sea urchin| 4| Shallow water|

Adaptation features of animals:
a. Against dislodgement by wave action:
i. hard shells (e.g. barnacles)
ii. strong attaching devices/ are immobile (e.g. oyster) iii. flattened body form (e.g. oyster)
b. Preventing predators:
iv. hard shells (e.g. hermit crab)
v. flattened body form (e.g. oyster)
c. Other adaptations:
vi. Against desiccation, wave and salinity
vii. Retreat to sheltered areas
viii. Protective cover
ix. Internal gill
x. Strong adhesive power (byssus threads, muscular food) xi. Flattened body
xii. Red pigment in algae for deep water illumination
Relationships between living organisms:
i. Commensalism
a. Barnacles attach onto crabs to benefit from the movement brought by crabs and the food remains on the surface of the crabs. b. Small crabs live in oysters' shells for protection and food by snatching food particles from the oysters without harming them. ii. Competition

c. Interspecific competition among mussels and barnacles for food and space on the rock surface. d. Intraspecific competition among barnacles for space and food. iii. Predation
e. Crabs (blue crabs) feed on periwinkles.
f. Periwinkles feed on green algae.
g. Barnacles eat seaweeds and planktons in the water.
h. Limpets eat...
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