Tdble 2. Comparison of the structure of parallel communities of Fucus 

 distichus and Fucus evanescens. 



F ucus di stic hus community: Fucu s evanesc ens community 



ithe 



2 



coast of Mirman. Total eastern Kamchatka and southern 

 Categories biomass 9133 g/m^ Kurile 



of species Average total biomass 4707 g/m 



No. of % of total Biomass No. of % of total Biomass 

 species No. of % of species No. of » of 

 species total species total 



Species common 

 to both com- 

 munities 19 31 5 19 16 8 



Vicariant 



species 30 48 84(12)* 42 36 85.5(12)* 



Species with 



no vicariance 13 21 11 57 48 5.5 



Undefined 



species - - 0.1 - - - 



Total species 62 - - 118 



*Parentheses show biomass excluding the dominant species _F. distichus or F. 

 evanescens. 



Patellidae and Tecturidae) are replaced by the externally quite similar 

 pulmonata Siphonari idae. 



4. Functionally analogous communities. The dominant species in 

 these communities are not related, and belong to different life forms, 

 but are in the same trophic group. For example, the communities of 

 filter feeders such as barnacles or mussels, common for the intertidal 

 zone, may be replaced by communities with predominance of other filter 

 feeders--sponges, simple Ascidia of the family Pyuridae, colonial 

 Ascidia of the family Polycl inidae , tubular polychaetes of the family 

 Sabellidae, etc. 



1.5 Supral ittoral Biota 



The population of the supral ittoral is extremely homogeneous. For 

 solid sediments, the crustose green and blue-green algae ( Calothrix , 

 Plectonema , Enthophysal is ) and crustose lichens (Verrucaria , Lichina , 

 Lithoicea , etc.) are typical . The fauna here are mixed in origin. 

 Typical land forms include insects (tochilidae, Staphyl i nidae, Diptera), 

 pseudoscorpions, red mites, as well as myriopods. The algal wastes 



145 



