45. 



peak densities between 100 to 200 meters in both the north 

 and south canyons. In the northern canyons this organism's 

 depth range extends much deeper than it does in Baltimore 

 Canyon. This difference is probably a reflection of increased 

 suitable substrate availability, namely the consolidated 

 clay outcrops found at greater depths in the northern canyons. 



Two organisms that do show emergence at higher latitudes 

 are Cerianthus bovealia and Canoev hovealis. The large 

 burrowing anemone Cerianthue hovealis has peak densities 

 between 200 to 400 meters in Baltimore Canyon and 2 00 to 3 00 

 meters in Lydonia Canyon. Similarly, the jonah crab Canoev 

 hovealis has peak abundances between 300 to 400 meters in 

 Baltimore Canyon and 100 to 2 00 meters in Lydonia Canyon. 

 The reasons for this emergence are unclear at this time, how- 

 ever, temperature has been implicated as being a factor causing 

 faunal emergence. Interestingly, the two species that do show 

 this pattern of emergence appear to be somewhat loosely 

 associated, in that small individuals of Canoev hovealis 

 are frequently found nestled around the base of the Cevianthus 

 hovealis tube. 



Figure 21 compares the depth distribution of the two 

 major crabs found in these canyons, the jonah crab Canoev 

 hovealis and the red crab Gevyon quinquedens . C, hovealis 

 is an important component of the shallow water assemblage, 

 while G, quinquedens is the dominant crab in deeper water. 



