Intertidal And Rocky Shores 2

Intertidal and Rocky Shores

Group Members:
Nguyen Thuy Nhung
Huynh Thi Hoai Thuong
Truong Thi Thanh Da
Nguyen Thi Phuong Thao
Nguyen Manh Duc

Outline
Habitat in intertidal rocky

shores
Intertidal distribution pattern Species list
Adaptation of organisms

1. Habitat in intertidal rocky shores

The intertidal zone: the region between the high

tide mark and the low tide mark
Tides are periodic rises and falls of large bodies of water caused by the gravitational interaction between the Earth and the Moon
The tide comes in and out almost twice in 24 hours, leaving the higher reaches of the shore exposed for much longer than the lower areas.

Low tide on the rocky shores

High tide on the rocky shore 1. Habitat in intertidal rocky shores

An extreme habitat

+ Movement of the tides
→ change oxygenation, desiccation and temperature
→ food and nutrients arrive, wastes are washed away
+ Physical action of waves
- Create shear forces on the rocks and could potentially dislodge organisms.

1. Habitat in intertidal rocky shores
+ Exposure to air
- Is stressful to marine organisms
+ Temperature fluctuation
-May change 300C within an hour
- More intense radiation
+ Change in Salinity and level of oxygen + Species relationship
They compete for space and food

2. Intertidal distribution pattern
Different organisms able to withstand different degrees of

stress are found other areas
Upper limit: depends on physical environment.
Lower limits: are affected by interactions between organisms The greater the shore’s slope and the lesser the variation in the surface form of the rock
→ more delineation
Locations within rocky shore sites support greater numbers of one species than others

Vertical distribution Rock pool

3. Species List
Organisms must be able to tolerate the physical

stresses unique to this environment

Animal
Phylum

Example

Mollusca

Periwinkle, mussel, smooth limpet, Striped limpet,
Scaly limpet, Ribbed top shell, Chiton, Dog