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Ecology of Portland Harbour
Below Low Tide
Index of Species
Low Tide Rockpools
Mid Tide Rockpools
Rocky Shelf
Strand Line
Sustainable Rockpooling

 
 
 
Home / Natural world / Ecology of Portland Harbour
 
Rocky Shelf
 
Source: Gunnleyg Eldevig, Angela Davis and George Taylor of Weymouth College (see below).
         
The rocky shelf is only flooded at high tide. A lot of the rocky shelf is covered by seaweed. Underneath the seaweed there is rich animal life in the cracks and channels along the rocks.
         
  • Edible Winkle: These are found on rocks and stones around the mid-tide rocky shelf and feed mainly on the algae on rocks.
  • Blenny: They are small fishes which change colour to match their surroundings. They live among rocks and feed on Barnacles, small crabs and other shell animals. They have very strong jaws with which to break up a number of different kinds of shell animals.
  • Rough Winkle: These are smaller than their relative the Edible Winkle and have lighter colours. They feed on seaweed and live in crevices in rocks.
  • Flat Winkle: As their name suggests, Flat Winkles are smoother than the Rough and Edible Winkle and are of a variety of colours including yellow and red. They live on seaweed, which is their main food source
 
Blenny
         
Serrated Wrack
 
  • Dogwhelk: They are also known as Nucella. They are creamy-grey in colour and are found in crevices and rocks. They live near Barnacles which they feed on.
  • Edible Crab: They live among rocks and in deep water and are orange-brown in colour. They have two huge pincers at the front plus four hairy legs on either side. They feed on other shellfish but are also great scavengers.
  • Serrated Wrack: This seaweed lives as separate male and female plants which differ in colour, the male is more darker-brown than the female. They occupy rocks and are home to many small animals such as Spirorbid Worms.
  • Bladder Wrack: These are larger than the Serrated Wrack and are covered in small air sacks. They occupy rocks and make food via photosynthesis
 
This page was produced by Gunnleyg Eldevig, Angela Davis and George Taylor of Weymouth College.
Photos by Bob Ford copyright Nature Portfolio Image Library
Photos may be copied for educational purposes only.
 
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