1 higher concentrations of commercial species in the canyonheads? I think 



2 the answer is yes. Dick? 



3 DR. COOPER: Absolutely. We can document that, too. 



4 DR. HECKER: Does anybody feel anything else should be on this 



5 list? 



5 DR. TEAL: All of this is in relation to the slope, not to the 



7 bank. 



8 DR. HECKER: AM of this is in relation to the slope. 



9 DR. COOPER: Slope/outer shelf. 



10 DR. MACIOLEK: That's true of, say, 150 meters which would be the 



11 edge of the shelf. Barbara-- 



12 DR. AURAND: That would be an important statement to include when 



13 you get into the writing of this--relative to what? 



14 DR. BUTMAN: Is that true of all canyons? 



15 DR. MACIOLEK: I only have information on Lydonia. 



16 DR. HECKER: Gil Rowe did some work in Hudson Canyon and I think 



17 he found higher concentrations but lower diversity. Also, there is some 



18 work on Hudson Canyon. I would have to check the paper, but it looks 



19 like along the whole axis is higher biomass, higher density but lower 



20 diversity. 



21 DR. RAY: Barbara, Jim Ray. In your statement up there about 



22 finely mediated pollutant concentrators, what types of filter feeders 



23 are you putting into the category, all of them? Are you figuring all of 



24 those corals and everything else? 



25 Is there any data to show that they are actually filters or is 



26 that just a hypothesis that because they are filter feeders, they are 



27 concentrating pollutants? 



28 DR. HECKER: Okay, it's a hypothesis. I don't know of any 



29 measurement done on it, except that the filter feeders do fine particles 



30 and, okay, Mike has said that these fine particles do tend to contain 



31 higher concentrations of materials. It is an inference. 



32 DR. RAY: In some filter feeders, some of the mollusks and stuff, 



33 there are a variety of mechanisms where the pollutants are retained. In 



218 



