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Table 5 - Marine biological zones and the factors determining them

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Table 5 Marine biological zones and the factors determining them

Zone
Typical upper boundaries around Britain and Ireland
Immersion
Thermal stability
Light
Salinity
Wave action
Adlittoral
  Spray only Highly variable Photic Saline influence None
Supralittoral
+10 to +6 m Spray and splash Highly variable Photic Euryhaline Highly variable
Eulittoral
+7 to +4 m MHWS Regular immersion and emersion Highly variable Photic Euryhaline Highly variable
Infralittoral
+1 to 0 m MLWS Immersed (intermittent spring tide emersion of sublittoral fringe) Variable - eurythermal Euphotic Euryhaline Variable
Circalittoral
-5 to -20 m Immersed Moderately variable - mesothermal Mesophotic (sparse algae, algal crusts) Mesohaline / Stenohaline Moderately variable
Circalittoral offshore
-40 to -80 m Immersed Stable - stenothermal Aphotic Stenohaline Stable
Bathyal
-200 m Immersed Very stable - stenothermal Aphotic Stenohaline Stable

 

This report should be cited as:
DAVID W. CONNOR, JAMES H. ALLEN, NEIL GOLDING, LOUISE M. LIEBERKNECHT, KATE O. NORTHEN AND JOHNNY B. REKER
The National Marine Habitat Classification for Britain and Ireland Version 03.02 2003 Copyright JNCC, Peterborough ISBN 1 86107 546 4 (internet version)