MARINlEi GAMMARIDEAOSr AMPHIPODA 



17 



The Composition of a Faunule 



A faunule is the aggregate of species of Gammaridea in one geo- 

 graphic province, region, or habitat. Five megafaunules are well 

 known: cold-temperate of northeast Atlantic, cold-temperate of 

 northwest Pacific (including the arctic-like Okhotsk region) ; circum- 

 subantarctic encompassing the Norwegian basin and the north coasts 

 of Siberia; the warm temperate of northeast Atlantic including the 

 western Mediterranean and the circum-antarctic-sub antarctic faunule. 

 Two faunules secondarily weU known are those of the South African 

 warm-temperate and the northeastern Pacific warm- temperate. The 

 faunules of individual islands or small geographic areas also have 

 been more intensively studied than of these larger provinces, examples 

 being Plymouth, England; Naples, Italy; South Georgia Island. 



A good model faunule is that of southern California because it is 

 midlatitudinal and relatively well explored by quantitative sampling. 

 The littoral-sublittoral (coastal shelf 0-100 m) faunule comprises 186 

 reported species of which 59 species live in both littoral and shallow 

 sublittoral depths; thus the littoral (intertidal) faunule totals 138 

 species, including about 5 species of beachhoppers and the sublittoral 

 (coastal shelf) faunule totals 166 species. 



Table 2. — Number of species and genera of Gammaridea in known faunules 



Region 



Genera 



Species 



Warm-temperate California 







intertidal (compiled) 



66 



138 



sublittoral 



98 



166 



total, less common to both 



112 



186 



Norway (Sars, 1895), boreal section, mainly sublittoral, 







0-80 fms 



115 



221 



0-50 fms 



110 



203 



Plymouth, England (Plymouth Marine Fauna), inter- 



63 



92 



tidal 







Isle of Man (Bruce et al, 1963) intertidal 



40 



66 



Mediterranean France (Chevreux & Fage, 1925), inter- 



41 



72 



tidal 







Atlantic France (Chevreux & Fage, 1925), intertidal 



69 



109 



South Georgia Island 



88 



159 



South Georgia Island, intertidal only (Schellenberg, 



45 



62 



1931) 







Falkland Islands, intertidal (Schellenberg, 1931) 



48 



63 



Magellan continental, intertidal (Schellenberg, 1931) 



57 



77 



Indo-Pacific tropics (not including Red Sea with an 



97 



204 



additional 22 species) (J. L. Barnard, 1965) 







