A-46, 



populations found on the northern canyon wall dives indicate 

 that canyons offer a variety of habitats. Seven species of 

 corals are dominant between 650 and 1550 meters on the wall 

 of Oceanographer Canyon, three monospecific and two 

 dispecific assemblages. The depth interval between 650 to 

 950 meters is dominated by Aaanthogorgia armata (8) which is 

 found on numerous glacial erratics and coral rubble. Between 

 950 and 1350 meters Aaanella arbuscula (3), Anthomastus 

 agassizii and Paramuviaea borealis (4) predominate. 

 Aaanella arbuscula is found on the soft substrate, while the 

 other two corals are restricted to the glacial erratics, out- 

 crops and coral rubble occurring in this area. Slightly 

 deeper Pennatula sp. and Anthomastus grandiflorus are found 

 on the soft substrate. The surface sediments on the wall of 

 Corsair Canyon are mostly composed of silt and consolidated 

 clay. The corals here are dominated by species requiring soft 

 substrates. The same is true for the wall of Heezen Canyon, 

 with the exception of the deeper part. Here outcrops occur 

 and the coral fauna is dominated by Paramuviaea borealis and 

 Anthomastus agassizii . A closer examination of the canyon 

 walls might yield distinct assemblages, but at this time the 

 data is not extensive enough to warrant this type of 

 analysis . 



Faunal Similarity 



The faunal similarity analysis yielded somewhat 



